MYSTCL Pixels

// SPDX-License-Identifier: MIXED

// Sources flattened with hardhat v2.14.0 https://hardhat.org

// File @chainlink/contracts/src/v0.8/interfaces/LinkTokenInterface.sol@v0.2.3

// License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);

  function approve(address spender, uint256 value) external returns (bool success);

  function balanceOf(address owner) external view returns (uint256 balance);

  function decimals() external view returns (uint8 decimalPlaces);

  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);

  function increaseApproval(address spender, uint256 subtractedValue) external;

  function name() external view returns (string memory tokenName);

  function symbol() external view returns (string memory tokenSymbol);

  function totalSupply() external view returns (uint256 totalTokensIssued);

  function transfer(address to, uint256 value) external returns (bool success);

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  ) external returns (bool success);

  function transferFrom(
    address from,
    address to,
    uint256 value
  ) external returns (bool success);
}


// File @chainlink/contracts/src/v0.8/VRFRequestIDBase.sol@v0.2.3

// License-Identifier: MIT
pragma solidity ^0.8.0;

contract VRFRequestIDBase {
  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  ) internal pure returns (uint256) {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(bytes32 _keyHash, uint256 _vRFInputSeed) internal pure returns (bytes32) {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}


// File @chainlink/contracts/src/v0.8/VRFConsumerBase.sol@v0.2.3

// License-Identifier: MIT
pragma solidity ^0.8.0;

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.)
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {
  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBase expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomness the VRF output
   */
  function fulfillRandomness(bytes32 requestId, uint256 randomness) internal virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 private constant USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(bytes32 _keyHash, uint256 _fee) internal returns (bytes32 requestId) {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface internal immutable LINK;
  address private immutable vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 => uint256) /* keyHash */ /* nonce */
    private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(address _vrfCoordinator, address _link) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(bytes32 requestId, uint256 randomness) external {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}


// File @openzeppelin/contracts/utils/Context.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}


// File @openzeppelin/contracts/access/Ownable.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


// File @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}


// File @openzeppelin/contracts/token/ERC20/IERC20.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}


// File @openzeppelin/contracts/utils/Address.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}


// File @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;



/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// File @openzeppelin/contracts/utils/introspection/IERC165.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}


// File @openzeppelin/contracts/token/ERC721/IERC721.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}


// File @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}


// File @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}


// File @openzeppelin/contracts/utils/introspection/ERC165.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}


// File @openzeppelin/contracts/utils/math/Math.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}


// File @openzeppelin/contracts/utils/Strings.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}


// File @openzeppelin/contracts/token/ERC721/ERC721.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.2) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;







/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}


// File @openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally checks to see if a
     * token-specific URI was set for the token, and if so, it deletes the token URI from
     * the storage mapping.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}


// File @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}


// File contracts/BattleRoyale.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract BattleRoyale is ERC721URIStorage, Ownable {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when user purchased the tokens.
  event Purchased(address user, uint256 amount, uint256 totalSupply);

  /// @notice Event emitted when owner has set starting time.
  event StartingTimeSet(uint256 time);

  /// @notice Event emitted when battle has started.
  event BattleStarted(address battleAddress, uint32[] inPlay);

  /// @notice Event emitted when battle has ended.
  event BattleEnded(address battleAddress, uint256 winnerTokenId, string prizeTokenURI);

  /// @notice Event emitted when token price set.
  event PriceSet(uint256 price);

  /// @notice Event emitted when the units per transaction set.
  event UnitsPerTransactionSet(uint256 unitsPerTransaction);

  /// @notice Event emitted when max supply set.
  event MaxSupplySet(uint256 maxSupply);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  BattleState public battleState;

  string public baseURI;
  string public defaultTokenURI;
  string public prizeTokenURI;

  uint256 public price;
  uint256 public maxSupply;
  uint256 public totalSupply;
  uint256 public unitsPerTransaction;
  uint256 public startingTime;

  uint32[] public inPlay;

  /**
   * @dev Constructor function
   * @param _name Token name
   * @param _symbol Token symbol
   * @param _price Token price
   * @param _unitsPerTransaction Purchasable token amounts per transaction
   * @param _maxSupply Maximum number of mintable tokens
   * @param _defaultTokenURI Deafult token uri
   * @param _prizeTokenURI Prize token uri
   * @param _baseURI Base token uri
   * @param _startingTime Start time to purchase NFT
   */
  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _price,
    uint256 _unitsPerTransaction,
    uint256 _maxSupply,
    string memory _baseURI,
    string memory _defaultTokenURI,
    string memory _prizeTokenURI,
    uint256 _startingTime
  ) ERC721(_name, _symbol) {
    battleState = BattleState.STANDBY;
    price = _price;
    unitsPerTransaction = _unitsPerTransaction;
    maxSupply = _maxSupply;
    baseURI = _baseURI;
    defaultTokenURI = _defaultTokenURI;
    prizeTokenURI = _prizeTokenURI;
    startingTime = _startingTime;
  }

  /**
   * @dev External function to purchase tokens.
   * @param _amount Token amount to buy
   */
  function purchase(uint256 _amount) external payable {
    require(price > 0, "Token price is zero");
    require(battleState == BattleState.STANDBY, "Not ready to purchase tokens");
    require(maxSupply > 0 && totalSupply < maxSupply, "All NFTs were sold out");
    require(block.timestamp >= startingTime, "Not time to purchase");

    if (msg.sender != owner()) {
      require(
        _amount <= maxSupply - totalSupply && _amount > 0 && _amount <= unitsPerTransaction,
        "Out range of token amount"
      );
      require(bytes(defaultTokenURI).length > 0, "Default token URI is not set");
      require(msg.value >= (price * _amount), "Not enough ETH for buying tokens");
    }

    for (uint256 i = 0; i < _amount; i++) {
      uint256 tokenId = totalSupply + i + 1;

      _safeMint(msg.sender, tokenId);

      string memory tokenURI = string(abi.encodePacked(baseURI, defaultTokenURI));

      _setTokenURI(tokenId, tokenURI);

      inPlay.push(uint32(tokenId));
    }

    totalSupply += _amount;

    emit Purchased(msg.sender, _amount, totalSupply);
  }

  /**
   * @dev External function to set starting time. This function can be called only by owner.
   */
  function setStartingTime(uint256 _newTime) external onlyOwner {
    startingTime = _newTime;

    emit StartingTimeSet(_newTime);
  }

  /**
   * @dev External function to start the battle. This function can be called only by owner.
   */
  function startBattle() external onlyOwner {
    require(bytes(prizeTokenURI).length > 0 && inPlay.length > 1, "Not enough tokens to play");
    battleState = BattleState.RUNNING;

    emit BattleStarted(address(this), inPlay);
  }

  /**
   * @dev External function to end the battle. This function can be called only by owner.
   * @param _winnerTokenId Winner token Id in battle
   */
  function endBattle(uint256 _winnerTokenId) external onlyOwner {
    require(battleState == BattleState.RUNNING, "Battle is not started");
    battleState = BattleState.ENDED;

    string memory tokenURI = string(abi.encodePacked(baseURI, prizeTokenURI));
    _setTokenURI(_winnerTokenId, tokenURI);

    emit BattleEnded(address(this), _winnerTokenId, tokenURI);
  }

  /**
   * @dev External function to set the base token URI. This function can be called only by owner.
   * @param _tokenURI New base token uri
   */
  function setBaseURI(string memory _tokenURI) external onlyOwner {
    baseURI = _tokenURI;
  }

  /**
   * @dev External function to set the default token URI. This function can be called only by owner.
   * @param _tokenURI New default token uri
   */
  function setDefaultTokenURI(string memory _tokenURI) external onlyOwner {
    defaultTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the prize token URI. This function can be called only by owner.
   * @param _tokenURI New prize token uri
   */
  function setPrizeTokenURI(string memory _tokenURI) external onlyOwner {
    prizeTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the token price. This function can be called only by owner.
   * @param _price New token price
   */
  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  /**
   * @dev External function to set the limit of buyable token amounts. This function can be called only by owner.
   * @param _unitsPerTransaction New purchasable token amounts per transaction
   */
  function setUnitsPerTransaction(uint256 _unitsPerTransaction) external onlyOwner {
    unitsPerTransaction = _unitsPerTransaction;

    emit UnitsPerTransactionSet(unitsPerTransaction);
  }

  /**
   * @dev External function to set max supply. This function can be called only by owner.
   * @param _maxSupply New maximum token amounts
   */
  function setMaxSupply(uint256 _maxSupply) external onlyOwner {
    maxSupply = _maxSupply;

    emit MaxSupplySet(maxSupply);
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "Out of balance");

    payable(msg.sender).transfer(_amount);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "Out of balance");

    token.safeTransfer(msg.sender, _amount);
  }
}


// File contracts/BattleRoyaleMintingNew.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract BattleRoyaleMintingNew is ERC721URIStorage, Ownable {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when user purchased the tokens.
  event Purchased(address user, uint256 amount, uint256 totalSupply);

  /// @notice Event emitted when owner has set starting time.
  event StartingTimeSet(uint256 time);

  /// @notice Event emitted when battle has started.
  event BattleStarted(address battleAddress, uint32[] inPlay);

  /// @notice Event emitted when battle has ended.
  event BattleEnded(
    address battleAddress,
    uint256 tokenId,
    uint256 winnerTokenId,
    string prizeTokenURI
  );

  /// @notice Event emitted when token price set.
  event PriceSet(uint256 price);

  /// @notice Event emitted when the units per transaction set.
  event UnitsPerTransactionSet(uint256 unitsPerTransaction);

  /// @notice Event emitted when max supply set.
  event MaxSupplySet(uint256 maxSupply);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  BattleState public battleState;

  string public prizeTokenURI;
  string public defaultTokenURI;
  string public baseURI;

  uint256 public price;
  uint256 public maxSupply;
  uint256 public totalSupply;
  uint256 public unitsPerTransaction;
  uint256 public startingTime;

  uint32[] public inPlay;

  /**
   * @dev Constructor function
   * @param _name Token name
   * @param _symbol Token symbol
   * @param _price Token price
   * @param _unitsPerTransaction Purchasable token amounts per transaction
   * @param _maxSupply Maximum number of mintable tokens
   * @param _defaultTokenURI Deafult token uri
   * @param _prizeTokenURI Prize token uri
   * @param _baseURI Base token uri
   * @param _startingTime Start time to purchase NFT
   */
  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _price,
    uint256 _unitsPerTransaction,
    uint256 _maxSupply,
    string memory _baseURI,
    string memory _defaultTokenURI,
    string memory _prizeTokenURI,
    uint256 _startingTime
  ) ERC721(_name, _symbol) {
    battleState = BattleState.STANDBY;
    price = _price;
    unitsPerTransaction = _unitsPerTransaction;
    maxSupply = _maxSupply;
    defaultTokenURI = _defaultTokenURI;
    prizeTokenURI = _prizeTokenURI;
    baseURI = _baseURI;
    startingTime = _startingTime;
  }

  /**
   * @dev External function to purchase tokens.
   * @param _amount Token amount to buy
   */
  function purchase(uint256 _amount) external payable {
    require(price > 0, "Token price is zero");
    require(battleState == BattleState.STANDBY, "Not ready to purchase tokens");
    require(maxSupply > 0 && totalSupply < maxSupply, "All NFTs were sold out");
    require(block.timestamp >= startingTime, "Not time to purchase");

    if (msg.sender != owner()) {
      require(
        _amount <= maxSupply - totalSupply && _amount > 0 && _amount <= unitsPerTransaction,
        "Out range of token amount"
      );
      require(bytes(defaultTokenURI).length > 0, "Default token URI is not set");
      require(msg.value >= (price * _amount), "Not enough ETH to buy tokens");
    }

    for (uint256 i = 0; i < _amount; i++) {
      uint256 tokenId = totalSupply + i + 1;

      _safeMint(msg.sender, tokenId);

      string memory tokenURI = string(abi.encodePacked(baseURI, defaultTokenURI));

      _setTokenURI(tokenId, tokenURI);

      inPlay.push(uint32(tokenId));
    }

    totalSupply += _amount;

    emit Purchased(msg.sender, _amount, totalSupply);
  }

  /**
   * @dev External function to set starting time. This function can be called only by owner.
   */
  function setStartingTime(uint256 _newTime) external onlyOwner {
    startingTime = _newTime;

    emit StartingTimeSet(_newTime);
  }

  /**
   * @dev External function to start the battle. This function can be called only by owner.
   */
  function startBattle() external onlyOwner {
    require(bytes(prizeTokenURI).length > 0 && inPlay.length > 1, "Not enough tokens to play");
    battleState = BattleState.RUNNING;

    emit BattleStarted(address(this), inPlay);
  }

  /**
   * @dev External function to end the battle. This function can be called only by owner.
   * @param _winnerTokenId Winner token Id in battle
   */
  function endBattle(uint256 _winnerTokenId) external onlyOwner {
    require(battleState == BattleState.RUNNING, "Battle is not started");
    battleState = BattleState.ENDED;

    uint256 tokenId = totalSupply + 1;

    address winnerAddress = ownerOf(_winnerTokenId);
    _safeMint(winnerAddress, tokenId);

    string memory tokenURI = string(abi.encodePacked(baseURI, prizeTokenURI));
    _setTokenURI(tokenId, tokenURI);

    emit BattleEnded(address(this), tokenId, _winnerTokenId, tokenURI);
  }

  /**
   * @dev External function to set the base token URI. This function can be called only by owner.
   * @param _tokenURI New base token uri
   */
  function setBaseURI(string memory _tokenURI) external onlyOwner {
    baseURI = _tokenURI;
  }

  /**
   * @dev External function to set the default token URI. This function can be called only by owner.
   * @param _tokenURI New default token uri
   */
  function setDefaultTokenURI(string memory _tokenURI) external onlyOwner {
    defaultTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the prize token URI. This function can be called only by owner.
   * @param _tokenURI New prize token uri
   */
  function setPrizeTokenURI(string memory _tokenURI) external onlyOwner {
    prizeTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the token price. This function can be called only by owner.
   * @param _price New token price
   */
  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  /**
   * @dev External function to set the limit of buyable token amounts. This function can be called only by owner.
   * @param _unitsPerTransaction New purchasable token amounts per transaction
   */
  function setUnitsPerTransaction(uint256 _unitsPerTransaction) external onlyOwner {
    unitsPerTransaction = _unitsPerTransaction;

    emit UnitsPerTransactionSet(unitsPerTransaction);
  }

  /**
   * @dev External function to set max supply. This function can be called only by owner.
   * @param _maxSupply New maximum token amounts
   */
  function setMaxSupply(uint256 _maxSupply) external onlyOwner {
    maxSupply = _maxSupply;

    emit MaxSupplySet(maxSupply);
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "Out of balance");

    payable(msg.sender).transfer(_amount);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "Out of balance");

    token.safeTransfer(msg.sender, _amount);
  }
}


// File contracts/BattleRoyaleNoPrize.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract BattleRoyaleNoPrize is ERC721URIStorage, Ownable {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when user purchased the tokens.
  event Purchased(address user, uint256 amount, uint256 totalSupply);

  /// @notice Event emitted when owner has set starting time.
  event StartingTimeSet(uint256 time);

  /// @notice Event emitted when battle has started.
  event BattleStarted(address battleAddress, uint32[] inPlay);

  /// @notice Event emitted when battle has ended.
  event BattleEnded(
    address battleAddress,
    uint256 tokenId,
    uint256 winnerTokenId,
    string prizeTokenURI
  );

  /// @notice Event emitted when token price set.
  event PriceSet(uint256 price);

  /// @notice Event emitted when the units per transaction set.
  event UnitsPerTransactionSet(uint256 unitsPerTransaction);

  /// @notice Event emitted when max supply set.
  event MaxSupplySet(uint256 maxSupply);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  BattleState public battleState;

  string public baseURI;
  string public defaultTokenURI;
  string public prizeTokenURI;

  uint256 public price;
  uint256 public maxSupply;
  uint256 public totalSupply;
  uint256 public unitsPerTransaction;
  uint256 public startingTime;

  uint32[] public inPlay;

  /**
   * @dev Constructor function
   * @param _name Token name
   * @param _symbol Token symbol
   * @param _price Token price
   * @param _unitsPerTransaction Purchasable token amounts per transaction
   * @param _maxSupply Maximum number of mintable tokens
   * @param _defaultTokenURI Deafult token uri
   * @param _prizeTokenURI Prize token uri
   * @param _baseURI Base token uri
   * @param _startingTime Start time to purchase NFT
   */
  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _price,
    uint256 _unitsPerTransaction,
    uint256 _maxSupply,
    string memory _baseURI,
    string memory _defaultTokenURI,
    string memory _prizeTokenURI,
    uint256 _startingTime
  ) ERC721(_name, _symbol) {
    battleState = BattleState.STANDBY;
    price = _price;
    unitsPerTransaction = _unitsPerTransaction;
    maxSupply = _maxSupply;
    baseURI = _baseURI;
    defaultTokenURI = _defaultTokenURI;
    prizeTokenURI = _prizeTokenURI;
    startingTime = _startingTime;
  }

  /**
   * @dev External function to purchase tokens.
   * @param _amount Token amount to buy
   */
  function purchase(uint256 _amount) external payable {
    require(price > 0, "Token price is zero");
    require(battleState == BattleState.STANDBY, "Not ready to purchase tokens");
    require(maxSupply > 0 && totalSupply < maxSupply, "All NFTs were sold out");
    require(block.timestamp >= startingTime, "Not time to purchase");

    if (msg.sender != owner()) {
      require(
        _amount <= maxSupply - totalSupply && _amount > 0 && _amount <= unitsPerTransaction,
        "Out range of token amount"
      );
      require(bytes(defaultTokenURI).length > 0, "Default token URI is not set");
      require(msg.value >= (price * _amount), "Not enough ETH for buying tokens");
    }

    for (uint256 i = 0; i < _amount; i++) {
      uint256 tokenId = totalSupply + i + 1;

      _safeMint(msg.sender, tokenId);

      string memory tokenURI = string(abi.encodePacked(baseURI, defaultTokenURI));

      _setTokenURI(tokenId, tokenURI);

      inPlay.push(uint32(tokenId));
    }

    totalSupply += _amount;

    emit Purchased(msg.sender, _amount, totalSupply);
  }

  /**
   * @dev External function to set starting time. This function can be called only by owner.
   */
  function setStartingTime(uint256 _newTime) external onlyOwner {
    startingTime = _newTime;

    emit StartingTimeSet(_newTime);
  }

  /**
   * @dev External function to start the battle. This function can be called only by owner.
   */
  function startBattle() external onlyOwner {
    require(bytes(prizeTokenURI).length > 0 && inPlay.length > 1, "Not enough tokens to play");
    battleState = BattleState.RUNNING;

    emit BattleStarted(address(this), inPlay);
  }

  /**
   * @dev External function to end the battle. This function can be called only by owner.
   * @param _winnerTokenId Winner token Id in battle
   */
  function endBattle(uint256 _winnerTokenId) external onlyOwner {
    require(battleState == BattleState.RUNNING, "Battle is not started");
    battleState = BattleState.ENDED;

    string memory tokenURI = string(abi.encodePacked(baseURI, prizeTokenURI));

    emit BattleEnded(address(this), _winnerTokenId, _winnerTokenId, tokenURI);
  }

  /**
   * @dev External function to set the base token URI. This function can be called only by owner.
   * @param _tokenURI New base token uri
   */
  function setBaseURI(string memory _tokenURI) external onlyOwner {
    baseURI = _tokenURI;
  }

  /**
   * @dev External function to set the default token URI. This function can be called only by owner.
   * @param _tokenURI New default token uri
   */
  function setDefaultTokenURI(string memory _tokenURI) external onlyOwner {
    defaultTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the prize token URI. This function can be called only by owner.
   * @param _tokenURI New prize token uri
   */
  function setPrizeTokenURI(string memory _tokenURI) external onlyOwner {
    prizeTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the token price. This function can be called only by owner.
   * @param _price New token price
   */
  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  /**
   * @dev External function to set the limit of buyable token amounts. This function can be called only by owner.
   * @param _unitsPerTransaction New purchasable token amounts per transaction
   */
  function setUnitsPerTransaction(uint256 _unitsPerTransaction) external onlyOwner {
    unitsPerTransaction = _unitsPerTransaction;

    emit UnitsPerTransactionSet(unitsPerTransaction);
  }

  /**
   * @dev External function to set max supply. This function can be called only by owner.
   * @param _maxSupply New maximum token amounts
   */
  function setMaxSupply(uint256 _maxSupply) external onlyOwner {
    maxSupply = _maxSupply;

    emit MaxSupplySet(maxSupply);
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "Out of balance");

    payable(msg.sender).transfer(_amount);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "Out of balance");

    token.safeTransfer(msg.sender, _amount);
  }
}


// File contracts/BattleRoyalePiece.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract BattleRoyalePiece is ERC721URIStorage, Ownable {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when contract is deployed.
  event BattleRoyalePieceDeployed();

  /// @notice Event emitted when owner withdrew the ETH.
  event EthWithdrew(address receiver);

  /// @notice Event emitted when owner withdrew the ERC20 token.
  event ERC20TokenWithdrew(address receiver);

  /// @notice Event emitted when user purchased the tokens.
  event Purchased(address user, uint256 amount, uint256 totalSupply);

  /// @notice Event emitted when owner has set starting time.
  event StartingTimeSet(uint256 time);

  /// @notice Event emitted when battle has started.
  event BattleStarted(address battleAddress, uint32[] inPlay);

  /// @notice Event emitted when battle has ended.
  event BattleEnded(address battleAddress, uint256 winnerTokenId, string prizeTokenURI);

  /// @notice Event emitted when token URI has changed.
  event TokenURIChanged(uint256 tokenType, string tokenURI);

  /// @notice Event emitted when prize token uri set.
  event PrizeTokenURISet(string prizeTokenURI);

  /// @notice Event emitted when token price set.
  event PriceSet(uint256 price);

  /// @notice Event emitted when the units per transaction set.
  event UnitsPerTransactionSet(uint256 defaultTokenURI);

  /// @notice Event emitted when max supply set.
  event MaxSupplySet(uint256 maxSupply);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  BattleState public battleState;

  string public prizeTokenURI;
  string public firstTokenURI;
  string public secondTokenURI;

  uint256 public price;
  uint256 public maxSupply;
  uint256 public totalSupply;
  uint256 public unitsPerTransaction;
  uint256 public startingTime;

  uint32[] public inPlay;

  /**
   * @dev Constructor function
   * @param _name Token name
   * @param _symbol Token symbol
   * @param _price Token price
   * @param _unitsPerTransaction Purchasable token amounts per transaction
   * @param _maxSupply Maximum number of mintable tokens
   * @param _firstTokenURI First artist token uri
   * @param _secondTokenURI Second artist token uri
   */
  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _price,
    uint256 _unitsPerTransaction,
    uint256 _maxSupply,
    string memory _firstTokenURI,
    string memory _secondTokenURI
  ) ERC721(_name, _symbol) {
    battleState = BattleState.STANDBY;
    price = _price;
    unitsPerTransaction = _unitsPerTransaction;
    maxSupply = _maxSupply;
    firstTokenURI = _firstTokenURI;
    secondTokenURI = _secondTokenURI;

    emit BattleRoyalePieceDeployed();
  }

  /**
   * @dev External function to purchase tokens.
   * @param _amount Token amount to buy
   * @param _type Token uri type
   */
  function purchase(uint256 _amount, uint256 _type) external payable {
    require(price > 0, "BattleRoyalePiece: Token price is zero");
    require(_type > 0 && _type < 3, "BattleRoyalePiece: Caller didn't choose the token type");
    require(
      battleState == BattleState.STANDBY,
      "BattleRoyalePiece: Current battle state is not ready to purchase tokens"
    );
    require(
      maxSupply > 0 && totalSupply < maxSupply,
      "BattleRoyalePiece: Total token amount is more than max supply"
    );
    require(block.timestamp >= startingTime, "BattleRoyalePiece: Not time to purchase");

    if (msg.sender != owner()) {
      require(
        _amount <= maxSupply - totalSupply && _amount > 0 && _amount <= unitsPerTransaction,
        "BattleRoyalePiece: Out range of token amount"
      );
      require(
        msg.value >= (price * _amount),
        "BattleRoyalePiece: Caller hasn't got enough ETH for buying tokens"
      );
    }

    for (uint256 i = 0; i < _amount; i++) {
      uint256 tokenId = totalSupply + i + 1;

      _safeMint(msg.sender, tokenId);

      if (_type == 1) {
        _setTokenURI(tokenId, firstTokenURI);
      } else {
        _setTokenURI(tokenId, secondTokenURI);
      }

      inPlay.push(uint32(tokenId));
    }

    totalSupply += _amount;

    emit Purchased(msg.sender, _amount, totalSupply);
  }

  /**
   * @dev External function to set starting time. This function can be called only by owner.
   */
  function setStartingTime(uint256 _newTime) external onlyOwner {
    startingTime = _newTime;

    emit StartingTimeSet(_newTime);
  }

  /**
   * @dev External function to start the battle. This function can be called only by owner.
   */
  function startBattle() external onlyOwner {
    require(
      bytes(prizeTokenURI).length > 0 && inPlay.length > 1,
      "BattleRoyalePiece: Tokens in game are not enough to play"
    );
    battleState = BattleState.RUNNING;

    emit BattleStarted(address(this), inPlay);
  }

  /**
   * @dev External function to end the battle. This function can be called only by owner.
   * @param _winnerTokenId Winner token Id in battle
   */
  function endBattle(uint256 _winnerTokenId) external onlyOwner {
    require(battleState == BattleState.RUNNING, "BattleRoyalePiece: Battle is not started");
    battleState = BattleState.ENDED;

    _setTokenURI(_winnerTokenId, prizeTokenURI);

    emit BattleEnded(address(this), _winnerTokenId, prizeTokenURI);
  }

  /**
   * @dev External function to change the token uri. This function can be called only by owner.
   * @param _type Token uri type 1: First token uri, 2: Second token uri
   * @param _tokenURI New token uri
   */
  function changeTokenURI(uint256 _type, string memory _tokenURI) external onlyOwner {
    require(_type > 0 && _type < 3, "BattleRoyalePiece: Type is not valid");

    if (_type == 1) {
      firstTokenURI = _tokenURI;
    } else {
      secondTokenURI = _tokenURI;
    }

    emit TokenURIChanged(_type, _tokenURI);
  }

  /**
   * @dev External function to set the prize token URI. This function can be called only by owner.
   * @param _tokenURI New prize token uri
   */
  function setPrizeTokenURI(string memory _tokenURI) external onlyOwner {
    prizeTokenURI = _tokenURI;

    emit PrizeTokenURISet(prizeTokenURI);
  }

  /**
   * @dev External function to set the token price. This function can be called only by owner.
   * @param _price New token price
   */
  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  /**
   * @dev External function to set the limit of buyable token amounts. This function can be called only by owner.
   * @param _unitsPerTransaction New purchasable token amounts per transaction
   */
  function setUnitsPerTransaction(uint256 _unitsPerTransaction) external onlyOwner {
    unitsPerTransaction = _unitsPerTransaction;

    emit UnitsPerTransactionSet(unitsPerTransaction);
  }

  /**
   * @dev External function to set max supply. This function can be called only by owner.
   * @param _maxSupply New maximum token amounts
   */
  function setMaxSupply(uint256 _maxSupply) external onlyOwner {
    maxSupply = _maxSupply;

    emit MaxSupplySet(maxSupply);
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "BattleRoyalePiece: Out of balance");

    payable(msg.sender).transfer(_amount);

    emit EthWithdrew(msg.sender);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "BattleRoyalePiece: Out of balance");

    token.safeTransfer(msg.sender, _amount);

    emit ERC20TokenWithdrew(msg.sender);
  }
}


// File contracts/BattleRoyaleRandom.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract BattleRoyaleRandom is ERC721URIStorage, Ownable {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when contract is deployed.
  event BattleRoyaleRandomDeployed();

  /// @notice Event emitted when owner withdrew the ETH.
  event EthWithdrew(address receiver);

  /// @notice Event emitted when owner withdrew the ERC20 token.
  event ERC20TokenWithdrew(address receiver);

  /// @notice Event emitted when user purchased the tokens.
  event Purchased(address user, uint256 amount, uint256 totalSupply);

  /// @notice Event emitted when owner has set starting time.
  event StartingTimeSet(uint256 time);

  /// @notice Event emitted when battle has started.
  event BattleStarted(address battleAddress, uint32[] inPlay);

  /// @notice Event emitted when battle has ended.
  event BattleEnded(address battleAddress, uint256 winnerTokenId, string prizeTokenURI);

  /// @notice Event emitted when token URIs set.
  event TokenURIsAdded(string[] tokenURIs);

  /// @notice Event emitted when token URI has updated.
  event TokenURIUpdated(uint256 index, string tokenURI);

  /// @notice Event emitted when token URI has removed.
  event TokenURIRemoved(uint256 index, string[] tokenURIs);

  /// @notice Event emitted when prize token uri set.
  event PrizeTokenURISet(string prizeTokenURI);

  /// @notice Event emitted when token price set.
  event PriceSet(uint256 price);

  /// @notice Event emitted when the units per transaction set.
  event UnitsPerTransactionSet(uint256 defaultTokenURI);

  /// @notice Event emitted when max supply set.
  event MaxSupplySet(uint256 maxSupply);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  BattleState public battleState;

  string public prizeTokenURI;
  string[] public tokenURIs;

  uint256 public price;
  uint256 public maxSupply;
  uint256 public totalSupply;
  uint256 public unitsPerTransaction;
  uint256 public startingTime;

  uint32[] public inPlay;

  /**
   * @dev Constructor function
   * @param _name Token name
   * @param _symbol Token symbol
   * @param _price Token price
   * @param _unitsPerTransaction Purchasable token amounts per transaction
   * @param _maxSupply Maximum number of mintable tokens
   */
  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _price,
    uint256 _unitsPerTransaction,
    uint256 _maxSupply
  ) ERC721(_name, _symbol) {
    battleState = BattleState.STANDBY;
    price = _price;
    unitsPerTransaction = _unitsPerTransaction;
    maxSupply = _maxSupply;

    emit BattleRoyaleRandomDeployed();
  }

  /**
   * @dev External function to purchase tokens.
   * @param _amount Token amount to buy
   */
  function purchase(uint256 _amount) external payable {
    require(
      battleState == BattleState.STANDBY,
      "BattleRoyaleRandom: Current battle state is not ready to purchase tokens"
    );
    require(
      maxSupply > 0 && totalSupply < maxSupply,
      "BattleRoyaleRandom: Total token amount is more than max supply"
    );

    require(
      tokenURIs.length >= _amount,
      "BattleRoyaleRandom: Token uris are not enough to purchase"
    );

    require(block.timestamp >= startingTime, "BattleRoyaleRandom: Not time to purchase");

    if (msg.sender != owner()) {
      require(
        _amount <= maxSupply - totalSupply && _amount > 0 && _amount <= unitsPerTransaction,
        "BattleRoyaleRandom: Out range of token amount"
      );
      require(
        msg.value >= (price * _amount),
        "BattleRoyaleRandom: Caller hasn't got enough ETH for buying tokens"
      );
    }

    for (uint256 i = 0; i < _amount; i++) {
      uint256 tokenId = totalSupply + i + 1;

      _safeMint(msg.sender, tokenId);

      uint256 index = uint256(
        keccak256(abi.encode(i, _amount, block.timestamp, msg.sender, tokenId))
      ) % tokenURIs.length;

      string memory tokenURI = tokenURIs[index];

      _setTokenURI(tokenId, tokenURI);

      tokenURIs[index] = tokenURIs[tokenURIs.length - 1];
      tokenURIs.pop();

      inPlay.push(uint32(tokenId));
    }

    totalSupply += _amount;

    emit Purchased(msg.sender, _amount, totalSupply);
  }

  /**
   * @dev External function to set starting time. This function can be called only by owner.
   */
  function setStartingTime(uint256 _newTime) external onlyOwner {
    startingTime = _newTime;

    emit StartingTimeSet(_newTime);
  }

  /**
   * @dev External function to start the battle. This function can be called only by owner.
   */
  function startBattle() external onlyOwner {
    require(
      bytes(prizeTokenURI).length > 0 && inPlay.length > 1,
      "BattleRoyaleRandom: Tokens in game are not enough to play"
    );
    battleState = BattleState.RUNNING;

    emit BattleStarted(address(this), inPlay);
  }

  /**
   * @dev External function to end the battle. This function can be called only by owner.
   * @param _winnerTokenId Winner token Id in battle
   */
  function endBattle(uint256 _winnerTokenId) external onlyOwner {
    require(battleState == BattleState.RUNNING, "BattleRoyaleRandom: Battle is not started");
    battleState = BattleState.ENDED;

    _setTokenURI(_winnerTokenId, prizeTokenURI);

    emit BattleEnded(address(this), _winnerTokenId, prizeTokenURI);
  }

  /**
   * @dev External function to add token URIs. This function can be called only by owner.
   * @param _tokenURIs Array of new token uris
   */
  function addTokenURIs(string[] memory _tokenURIs) external onlyOwner {
    for (uint256 i = 0; i < _tokenURIs.length; i++) {
      tokenURIs.push(_tokenURIs[i]);
    }

    emit TokenURIsAdded(_tokenURIs);
  }

  /**
   * @dev External function to update the token uri. This function can be called only by owner.
   * @param _index Index of token uri
   * @param _tokenURI Array of new token uris
   */
  function updateTokenURI(uint256 _index, string memory _tokenURI) external onlyOwner {
    tokenURIs[_index] = _tokenURI;

    emit TokenURIUpdated(_index, _tokenURI);
  }

  /**
   * @dev External function to remove the token uri. This function can be called only by owner.
   * @param _index Index of token uri
   */
  function removeTokenURI(uint256 _index) external onlyOwner {
    tokenURIs[_index] = tokenURIs[tokenURIs.length - 1];
    tokenURIs.pop();

    emit TokenURIRemoved(_index, tokenURIs);
  }

  /**
   * @dev External function to set the prize token URI. This function can be called only by owner.
   * @param _tokenURI New prize token uri
   */
  function setPrizeTokenURI(string memory _tokenURI) external onlyOwner {
    prizeTokenURI = _tokenURI;

    emit PrizeTokenURISet(prizeTokenURI);
  }

  /**
   * @dev External function to set the token price. This function can be called only by owner.
   * @param _price New token price
   */
  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  /**
   * @dev External function to set the limit of buyable token amounts. This function can be called only by owner.
   * @param _unitsPerTransaction New purchasable token amounts per transaction
   */
  function setUnitsPerTransaction(uint256 _unitsPerTransaction) external onlyOwner {
    unitsPerTransaction = _unitsPerTransaction;

    emit UnitsPerTransactionSet(unitsPerTransaction);
  }

  /**
   * @dev External function to set max supply. This function can be called only by owner.
   * @param _maxSupply New maximum token amounts
   */
  function setMaxSupply(uint256 _maxSupply) external onlyOwner {
    maxSupply = _maxSupply;

    emit MaxSupplySet(maxSupply);
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "BattleRoyaleRandom: Out of balance");

    payable(msg.sender).transfer(_amount);

    emit EthWithdrew(msg.sender);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "BattleRoyaleRandom: Out of balance");

    token.safeTransfer(msg.sender, _amount);

    emit ERC20TokenWithdrew(msg.sender);
  }
}


// File contracts/BattleRoyaleRandomPart.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract BattleRoyaleRandomPart is ERC721URIStorage, Ownable {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when user purchased the tokens.
  event Purchased(address user, uint256 amount, uint256 totalSupply);

  /// @notice Event emitted when owner has set starting time.
  event StartingTimeSet(uint256 time);

  /// @notice Event emitted when battle has started.
  event BattleStarted(address battleAddress, uint32[] inPlay);

  /// @notice Event emitted when battle has ended.
  event BattleEnded(
    address battleAddress,
    uint256 tokenId,
    uint256 winnerTokenId,
    string prizeTokenURI
  );

  /// @notice Event emitted when token price set.
  event PriceSet(uint256 price);

  /// @notice Event emitted when the units per transaction set.
  event UnitsPerTransactionSet(uint256 defaultTokenURI);

  /// @notice Event emitted when max supply set.
  event MaxSupplySet(uint256 maxSupply);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  BattleState public battleState;

  string public prizeTokenURI;
  string[] public defaultTokenURI;
  string public baseURI;
  uint256 public price;
  uint256 public maxSupply;
  uint256 public totalSupply;
  uint256 public unitsPerTransaction;
  uint256 public startingTime;
  uint256 public defaultNFTTypeCount;
  uint256 public totalDefaultNFTTypeCount;

  uint32[] public inPlay;

  mapping(string => uint256) public tokenURICount;

  /**
   * @dev Constructor function
   * @param _name Token name
   * @param _symbol Token symbol
   * @param _price Token price
   * @param _unitsPerTransaction Purchasable token amounts per transaction
   * @param _prizeTokenURI Prize token uri
   * @param _baseURI Base token uri
   * @param _startingTime Start time to purchase NFT
   */
  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _price,
    uint256 _unitsPerTransaction,
    string memory _baseURI,
    string memory _prizeTokenURI,
    uint256 _startingTime
  ) ERC721(_name, _symbol) {
    battleState = BattleState.STANDBY;
    price = _price;
    unitsPerTransaction = _unitsPerTransaction;
    prizeTokenURI = _prizeTokenURI;
    baseURI = _baseURI;
    startingTime = _startingTime;
  }

  /**
   * @dev External function to purchase tokens.
   * @param _amount Token amount to buy
   */
  function purchase(uint256 _amount) external payable {
    require(battleState == BattleState.STANDBY, "Not ready to purchase tokens");
    require(maxSupply > 0 && totalSupply < maxSupply, "All NFTs were sold out");

    require(block.timestamp >= startingTime, "Not time to purchase");

    if (msg.sender != owner()) {
      require(
        _amount <= maxSupply - totalSupply && _amount > 0 && _amount <= unitsPerTransaction,
        "Out range of token amount"
      );
      require(msg.value >= (price * _amount), "Not enough ETH for buying tokens");
    }

    for (uint256 i = 0; i < _amount; i++) {
      uint256 tokenId = totalSupply + i + 1;

      _safeMint(msg.sender, tokenId);

      uint256 index = uint256(
        keccak256(abi.encode(i, _amount, block.timestamp, msg.sender, tokenId))
      ) % defaultNFTTypeCount;

      _setTokenURI(tokenId, string(abi.encodePacked(baseURI, defaultTokenURI[index])));

      tokenURICount[defaultTokenURI[index]]--;

      if (tokenURICount[defaultTokenURI[index]] == 0) {
        string memory defaultTokenURICID = defaultTokenURI[index];
        defaultTokenURI[index] = defaultTokenURI[defaultNFTTypeCount - 1];
        defaultTokenURI[defaultNFTTypeCount - 1] = defaultTokenURICID;
        defaultNFTTypeCount--;
      }

      inPlay.push(uint32(tokenId));
    }

    totalSupply += _amount;

    emit Purchased(msg.sender, _amount, totalSupply);
  }

  /**
   * @dev External function to set starting time. This function can be called only by owner.
   */
  function setStartingTime(uint256 _newTime) external onlyOwner {
    startingTime = _newTime;

    emit StartingTimeSet(_newTime);
  }

  /**
   * @dev External function to start the battle. This function can be called only by owner.
   */
  function startBattle() external onlyOwner {
    battleState = BattleState.RUNNING;

    emit BattleStarted(address(this), inPlay);
  }

  /**
   * @dev External function to end the battle. This function can be called only by owner.
   * @param _winnerTokenId Winner token Id in battle
   */
  function endBattle(uint256 _winnerTokenId) external onlyOwner {
    require(battleState == BattleState.RUNNING, "Battle is not started");
    battleState = BattleState.ENDED;

    uint256 tokenId = totalSupply + 1;

    _safeMint(ownerOf(_winnerTokenId), tokenId);

    _setTokenURI(tokenId, string(abi.encodePacked(baseURI, prizeTokenURI)));

    emit BattleEnded(
      address(this),
      tokenId,
      _winnerTokenId,
      string(abi.encodePacked(baseURI, prizeTokenURI))
    );
  }

  /**
   * @dev External function to set the base token URI. This function can be called only by owner.
   * @param _newBaseURI New base token uri
   */
  function setBaseURI(string memory _newBaseURI) external onlyOwner {
    baseURI = _newBaseURI;
  }

  /**
   * @dev External function to add token URI. This function can be called only by owner.
   * @param _tokenURI New token uri
   * @param _count Token uri count
   */
  function addTokenURI(string memory _tokenURI, uint256 _count) external onlyOwner {
    defaultTokenURI.push(_tokenURI);
    tokenURICount[_tokenURI] = _count;
    maxSupply += _count;
    defaultNFTTypeCount++;
    totalDefaultNFTTypeCount++;
  }

  /**
   * @dev External function to change the token uri. This function can be called only by owner.
   * @param _tokenURI Token uri
   * @param _count Token uri count
   */
  function updateTokenURICount(string memory _tokenURI, uint256 _count) external onlyOwner {
    maxSupply = maxSupply - tokenURICount[_tokenURI] + _count;
    tokenURICount[_tokenURI] = _count;
  }

  /**
   * @dev External function to remove the token uri. This function can be called only by owner.
   * @param _index Index of token uri
   */
  function removeTokenURI(uint256 _index) external onlyOwner {
    string memory tokenURI = defaultTokenURI[_index];
    maxSupply -= tokenURICount[tokenURI];
    delete tokenURICount[tokenURI];
    defaultTokenURI[_index] = defaultTokenURI[defaultTokenURI.length - 1];
    defaultTokenURI.pop();
    defaultNFTTypeCount--;
    totalDefaultNFTTypeCount--;
  }

  /**
   * @dev External function to set the prize token URI. This function can be called only by owner.
   * @param _tokenURI New prize token uri
   */
  function setPrizeTokenURI(string memory _tokenURI) external onlyOwner {
    prizeTokenURI = _tokenURI;
  }

  /**
   * @dev External function to set the token price. This function can be called only by owner.
   * @param _price New token price
   */
  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  /**
   * @dev External function to set the limit of buyable token amounts. This function can be called only by owner.
   * @param _unitsPerTransaction New purchasable token amounts per transaction
   */
  function setUnitsPerTransaction(uint256 _unitsPerTransaction) external onlyOwner {
    unitsPerTransaction = _unitsPerTransaction;

    emit UnitsPerTransactionSet(unitsPerTransaction);
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "Out of balance");

    payable(msg.sender).transfer(_amount);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "Out of balance");

    token.safeTransfer(msg.sender, _amount);
  }
}


// File @chainlink/contracts/src/v0.8/interfaces/KeeperCompatibleInterface.sol@v0.2.3

// License-Identifier: MIT
pragma solidity ^0.8.0;

interface KeeperCompatibleInterface {
  /**
   * @notice method that is simulated by the keepers to see if any work actually
   * needs to be performed. This method does does not actually need to be
   * executable, and since it is only ever simulated it can consume lots of gas.
   * @dev To ensure that it is never called, you may want to add the
   * cannotExecute modifier from KeeperBase to your implementation of this
   * method.
   * @param checkData specified in the upkeep registration so it is always the
   * same for a registered upkeep. This can easilly be broken down into specific
   * arguments using `abi.decode`, so multiple upkeeps can be registered on the
   * same contract and easily differentiated by the contract.
   * @return upkeepNeeded boolean to indicate whether the keeper should call
   * performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if
   * upkeep is needed. If you would like to encode data to decode later, try
   * `abi.encode`.
   */
  function checkUpkeep(bytes calldata checkData) external returns (bool upkeepNeeded, bytes memory performData);

  /**
   * @notice method that is actually executed by the keepers, via the registry.
   * The data returned by the checkUpkeep simulation will be passed into
   * this method to actually be executed.
   * @dev The input to this method should not be trusted, and the caller of the
   * method should not even be restricted to any single registry. Anyone should
   * be able call it, and the input should be validated, there is no guarantee
   * that the data passed in is the performData returned from checkUpkeep. This
   * could happen due to malicious keepers, racing keepers, or simply a state
   * change while the performUpkeep transaction is waiting for confirmation.
   * Always validate the data passed in.
   * @param performData is the data which was passed back from the checkData
   * simulation. If it is encoded, it can easily be decoded into other types by
   * calling `abi.decode`. This data should not be trusted, and should be
   * validated against the contract's current state.
   */
  function performUpkeep(bytes calldata performData) external;
}


// File contracts/ChainlinkBattle.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract ChainlinkBattle is VRFConsumerBase, Ownable, KeeperCompatibleInterface {
  using SafeERC20 for IERC20;

  /// @notice Event emitted when battle is added.
  event BattleAdded(BattleInfo battle);

  /// @notice Event emitted when battle is executed.
  event BattleExecuted(uint256 battleId, bytes32 requestId);

  /// @notice Event emitted when one nft is eliminated.
  event Eliminated(address gameAddr, uint256 tokenId, bool battleState);

  /// @notice Event emitted when winner is set.
  event BattleEnded(bool finished, address gameAddr, uint256 winnerTokenId, bool battleState);

  /// @notice Event emitted when interval time is set.
  event BattleIntervalTimeSet(uint256 battleId, uint256 intervalTime);

  /// @notice Event emitted when eliminated token count is set.
  event EliminatedTokenCountSet(uint256 battleId, uint256 eliminatedTokenCount);

  bytes32 internal keyHash;
  uint256 public fee;

  mapping(bytes32 => uint256) private requestToBattle;

  struct BattleInfo {
    address gameAddr;
    uint256 intervalTime;
    uint256 lastEliminatedTime;
    uint32[] inPlay;
    uint32[] outOfPlay;
    bool battleState;
    uint256 winnerTokenId;
    uint256 eliminatedTokenCount;
  }

  BattleInfo[] public battleQueue;

  uint256 public battleQueueLength;

  /**
   * Constructor inherits VRFConsumerBase
   *
   * Network: Polygon(Matic) Mainnet
   * Chainlink VRF Coordinator address: 0x3d2341ADb2D31f1c5530cDC622016af293177AE0
   * LINK token address:                0xb0897686c545045aFc77CF20eC7A532E3120E0F1
   * Key Hash:                          0xf86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da
   * Fee : 0.0001LINK
   */
  constructor(
    address _vrfCoordinator,
    address _link,
    bytes32 _keyHash,
    uint256 _fee
  )
    VRFConsumerBase(
      _vrfCoordinator, // VRF Coordinator
      _link // LINK Token
    )
  {
    keyHash = _keyHash;
    fee = _fee;
  }

  /**
   * @dev External function to add battle. This function can be called only by owner.
   * @param _gameAddr Battle game address
   * @param _intervalTime Interval time
   * @param _inPlay Tokens in game
   * @param _eliminatedTokenCount Number of tokens that should be removed by one perfermUpKeep.
   */
  function addToBattleQueue(
    address _gameAddr,
    uint256 _intervalTime,
    uint32[] memory _inPlay,
    uint256 _eliminatedTokenCount
  ) external onlyOwner {
    BattleInfo memory battle;
    battle.gameAddr = _gameAddr;
    battle.intervalTime = _intervalTime;
    battle.lastEliminatedTime = block.timestamp;
    battle.inPlay = _inPlay;
    battle.battleState = true;
    battle.eliminatedTokenCount = _eliminatedTokenCount;

    battleQueue.push(battle);
    battleQueueLength++;

    emit BattleAdded(battle);
  }

  /**
   * @dev External function to check if the contract requires work to be done.
   * @param _checkData Data passed to the contract when checking for upkeep.
   * @return upkeepNeeded boolean to indicate whether the keeper should call performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if upkeep is needed.
   */
  function checkUpkeep(bytes calldata _checkData)
    external
    view
    override
    returns (bool, bytes memory)
  {
    for (uint256 i = 0; i < battleQueue.length; i++) {
      BattleInfo memory battle = battleQueue[i];
      if (
        battle.battleState == true &&
        block.timestamp >= battle.lastEliminatedTime + (battle.intervalTime * 1 minutes)
      ) {
        return (true, abi.encodePacked(i));
      }
    }
    return (false, _checkData);
  }

  /**
   * @dev Performs work on the contract. Executed by the keepers, via the registry.
   * @param _performData is the data which was passed back from the checkData simulation.
   */
  function performUpkeep(bytes calldata _performData) external override {
    uint256 battleId = bytesToUint256(_performData, 0);
    BattleInfo memory battle = battleQueue[battleId];

    require(battle.battleState, "Current battle is finished");
    require(
      block.timestamp >= battle.lastEliminatedTime + (battle.intervalTime * 1 minutes),
      "Trigger time is not correct"
    );

    executeBattle(battleId);
  }

  /**
   * @dev Internal function to execute battle.
   * @param _battleId Battle Id
   */
  function executeBattle(uint256 _battleId) internal {
    BattleInfo storage battle = battleQueue[_battleId];

    require(LINK.balanceOf(address(this)) >= fee, "Not enough LINK");
    require(battle.battleState, "Current battle is finished");

    bytes32 requestId = requestRandomness(keyHash, fee);
    requestToBattle[requestId] = _battleId;
    battle.lastEliminatedTime = block.timestamp;

    emit BattleExecuted(_battleId, requestId);
  }

  /**
   * @dev Callback function used by VRF Coordinator.
   * @param _requestId Request Id
   * @param _randomness Random Number
   */
  function fulfillRandomness(bytes32 _requestId, uint256 _randomness) internal override {
    uint256 _battleId = requestToBattle[_requestId];
    BattleInfo storage battle = battleQueue[_battleId];
    uint256 eliminatedTokenCount = battle.eliminatedTokenCount;

    if (eliminatedTokenCount >= battle.inPlay.length) {
      eliminatedTokenCount = battle.inPlay.length - 1;
    }

    for (uint256 index = 0; index < eliminatedTokenCount; index++) {
      uint256 i = uint256(keccak256(abi.encode(_randomness, index, block.timestamp))) %
        battle.inPlay.length;

      uint32 tokenId = battle.inPlay[i];

      battle.outOfPlay.push(tokenId);
      battle.inPlay[i] = battle.inPlay[battle.inPlay.length - 1];
      battle.inPlay.pop();

      emit Eliminated(battle.gameAddr, tokenId, true);
    }

    if (battle.inPlay.length == 1) {
      battle.battleState = false;
      battle.winnerTokenId = battle.inPlay[0];
      emit BattleEnded(true, battle.gameAddr, battle.winnerTokenId, false);
    }
  }

  /**
   * @dev External function to set battle interval time. This function can be called only by owner.
   * @param _battleId Battle Id
   * @param _intervalTime New interval time
   */
  function setBattleIntervalTime(uint256 _battleId, uint256 _intervalTime) external onlyOwner {
    BattleInfo storage battle = battleQueue[_battleId];
    battle.intervalTime = _intervalTime;

    emit BattleIntervalTimeSet(_battleId, _intervalTime);
  }

  /**
   * @dev External function to set eliminated token count. This function can be called only by owner.
   * @param _battleId Battle Id
   * @param _eliminatedTokenCount New eliminated token count
   */
  function setEliminatedTokenCount(uint256 _battleId, uint256 _eliminatedTokenCount)
    external
    onlyOwner
  {
    BattleInfo storage battle = battleQueue[_battleId];
    battle.eliminatedTokenCount = _eliminatedTokenCount;

    emit EliminatedTokenCountSet(_battleId, _eliminatedTokenCount);
  }

  /**
   * @dev External function to get in-play tokens.
   * @param _battleId Battle Id
   */
  function getInPlay(uint256 _battleId) external view returns (uint32[] memory) {
    return battleQueue[_battleId].inPlay;
  }

  /**
   * @dev External function to get out-play tokens.
   * @param _battleId Battle Id
   */
  function getOutPlay(uint256 _battleId) external view returns (uint32[] memory) {
    return battleQueue[_battleId].outOfPlay;
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to get the current link balance in contract.
   */
  function getCurrentLinkBalance() external view returns (uint256) {
    return LINK.balanceOf(address(this));
  }

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "Out of balance");

    payable(msg.sender).transfer(_amount);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "Out of balance");

    token.safeTransfer(msg.sender, _amount);
  }

  /**
   * @dev Internal function to convert bytes to uint256.
   * @param _bytes value
   * @param _start Start index
   */
  function bytesToUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
    require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
    uint256 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x20), _start))
    }

    return tempUint;
  }
}


// File @openzeppelin/contracts/security/ReentrancyGuard.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}


// File @openzeppelin/contracts/utils/cryptography/MerkleProof.sol@v4.8.3

// License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     *
     * _Available since v4.7._
     */
    function verifyCalldata(
        bytes32[] calldata proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     *
     * _Available since v4.7._
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     *
     * _Available since v4.7._
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            return hashes[totalHashes - 1];
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all merkle trees admit multiproofs. See {processMultiProof} for details.
     *
     * _Available since v4.7._
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof");

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            return hashes[totalHashes - 1];
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}


// File erc721a/contracts/ERC721A.sol@v2.2.0

// License-Identifier: MIT
// Creator: Chiru Labs

pragma solidity ^0.8.4;








error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintedQueryForZeroAddress();
error BurnedQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerIndexOutOfBounds();
error OwnerQueryForNonexistentToken();
error TokenIndexOutOfBounds();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error URIQueryForNonexistentToken();

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata and Enumerable extension. Built to optimize for lower gas during batch mints.
 *
 * Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).
 *
 * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
 *
 * Assumes that the maximum token id cannot exceed 2**128 - 1 (max value of uint128).
 */
contract ERC721A is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using Address for address;
    using Strings for uint256;

    // Compiler will pack this into a single 256bit word.
    struct TokenOwnership {
        // The address of the owner.
        address addr;
        // Keeps track of the start time of ownership with minimal overhead for tokenomics.
        uint64 startTimestamp;
        // Whether the token has been burned.
        bool burned;
    }

    // Compiler will pack this into a single 256bit word.
    struct AddressData {
        // Realistically, 2**64-1 is more than enough.
        uint64 balance;
        // Keeps track of mint count with minimal overhead for tokenomics.
        uint64 numberMinted;
        // Keeps track of burn count with minimal overhead for tokenomics.
        uint64 numberBurned;
    }

    // Compiler will pack the following 
    // _currentIndex and _burnCounter into a single 256bit word.
    
    // The tokenId of the next token to be minted.
    uint128 internal _currentIndex;

    // The number of tokens burned.
    uint128 internal _burnCounter;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to ownership details
    // An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.
    mapping(uint256 => TokenOwnership) internal _ownerships;

    // Mapping owner address to address data
    mapping(address => AddressData) private _addressData;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        // Counter underflow is impossible as _burnCounter cannot be incremented
        // more than _currentIndex times
        unchecked {
            return _currentIndex - _burnCounter;    
        }
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     * This read function is O(totalSupply). If calling from a separate contract, be sure to test gas first.
     * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.
     */
    function tokenByIndex(uint256 index) public view override returns (uint256) {
        uint256 numMintedSoFar = _currentIndex;
        uint256 tokenIdsIdx;

        // Counter overflow is impossible as the loop breaks when
        // uint256 i is equal to another uint256 numMintedSoFar.
        unchecked {
            for (uint256 i; i < numMintedSoFar; i++) {
                TokenOwnership memory ownership = _ownerships[i];
                if (!ownership.burned) {
                    if (tokenIdsIdx == index) {
                        return i;
                    }
                    tokenIdsIdx++;
                }
            }
        }
        revert TokenIndexOutOfBounds();
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     * This read function is O(totalSupply). If calling from a separate contract, be sure to test gas first.
     * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {
        if (index >= balanceOf(owner)) revert OwnerIndexOutOfBounds();
        uint256 numMintedSoFar = _currentIndex;
        uint256 tokenIdsIdx;
        address currOwnershipAddr;

        // Counter overflow is impossible as the loop breaks when
        // uint256 i is equal to another uint256 numMintedSoFar.
        unchecked {
            for (uint256 i; i < numMintedSoFar; i++) {
                TokenOwnership memory ownership = _ownerships[i];
                if (ownership.burned) {
                    continue;
                }
                if (ownership.addr != address(0)) {
                    currOwnershipAddr = ownership.addr;
                }
                if (currOwnershipAddr == owner) {
                    if (tokenIdsIdx == index) {
                        return i;
                    }
                    tokenIdsIdx++;
                }
            }
        }

        // Execution should never reach this point.
        revert();
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            interfaceId == type(IERC721Enumerable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view override returns (uint256) {
        if (owner == address(0)) revert BalanceQueryForZeroAddress();
        return uint256(_addressData[owner].balance);
    }

    function _numberMinted(address owner) internal view returns (uint256) {
        if (owner == address(0)) revert MintedQueryForZeroAddress();
        return uint256(_addressData[owner].numberMinted);
    }

    function _numberBurned(address owner) internal view returns (uint256) {
        if (owner == address(0)) revert BurnedQueryForZeroAddress();
        return uint256(_addressData[owner].numberBurned);
    }

    /**
     * Gas spent here starts off proportional to the maximum mint batch size.
     * It gradually moves to O(1) as tokens get transferred around in the collection over time.
     */
    function ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {
        uint256 curr = tokenId;

        unchecked {
            if (curr < _currentIndex) {
                TokenOwnership memory ownership = _ownerships[curr];
                if (!ownership.burned) {
                    if (ownership.addr != address(0)) {
                        return ownership;
                    }
                    // Invariant: 
                    // There will always be an ownership that has an address and is not burned 
                    // before an ownership that does not have an address and is not burned.
                    // Hence, curr will not underflow.
                    while (true) {
                        curr--;
                        ownership = _ownerships[curr];
                        if (ownership.addr != address(0)) {
                            return ownership;
                        }
                    }
                }
            }
        }
        revert OwnerQueryForNonexistentToken();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return ownershipOf(tokenId).addr;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

        string memory baseURI = _baseURI();
        return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : '';
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return '';
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public override {
        address owner = ERC721A.ownerOf(tokenId);
        if (to == owner) revert ApprovalToCurrentOwner();

        if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {
            revert ApprovalCallerNotOwnerNorApproved();
        }

        _approve(to, tokenId, owner);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view override returns (address) {
        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public override {
        if (operator == _msgSender()) revert ApproveToCaller();

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, '');
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        _transfer(from, to, tokenId);
        if (!_checkOnERC721Received(from, to, tokenId, _data)) {
            revert TransferToNonERC721ReceiverImplementer();
        }
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return tokenId < _currentIndex && !_ownerships[tokenId].burned;
    }

    function _safeMint(address to, uint256 quantity) internal {
        _safeMint(to, quantity, '');
    }

    /**
     * @dev Safely mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(
        address to,
        uint256 quantity,
        bytes memory _data
    ) internal {
        _mint(to, quantity, _data, true);
    }

    /**
     * @dev Mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event.
     */
    function _mint(
        address to,
        uint256 quantity,
        bytes memory _data,
        bool safe
    ) internal {
        uint256 startTokenId = _currentIndex;
        if (to == address(0)) revert MintToZeroAddress();
        if (quantity == 0) revert MintZeroQuantity();

        _beforeTokenTransfers(address(0), to, startTokenId, quantity);

        // Overflows are incredibly unrealistic.
        // balance or numberMinted overflow if current value of either + quantity > 3.4e38 (2**128) - 1
        // updatedIndex overflows if _currentIndex + quantity > 3.4e38 (2**128) - 1
        unchecked {
            _addressData[to].balance += uint64(quantity);
            _addressData[to].numberMinted += uint64(quantity);

            _ownerships[startTokenId].addr = to;
            _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);

            uint256 updatedIndex = startTokenId;

            for (uint256 i; i < quantity; i++) {
                emit Transfer(address(0), to, updatedIndex);
                if (safe && !_checkOnERC721Received(address(0), to, updatedIndex, _data)) {
                    revert TransferToNonERC721ReceiverImplementer();
                }
                updatedIndex++;
            }

            _currentIndex = uint128(updatedIndex);
        }
        _afterTokenTransfers(address(0), to, startTokenId, quantity);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) private {
        TokenOwnership memory prevOwnership = ownershipOf(tokenId);

        bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||
            isApprovedForAll(prevOwnership.addr, _msgSender()) ||
            getApproved(tokenId) == _msgSender());

        if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
        if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();
        if (to == address(0)) revert TransferToZeroAddress();

        _beforeTokenTransfers(from, to, tokenId, 1);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId, prevOwnership.addr);

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**128.
        unchecked {
            _addressData[from].balance -= 1;
            _addressData[to].balance += 1;

            _ownerships[tokenId].addr = to;
            _ownerships[tokenId].startTimestamp = uint64(block.timestamp);

            // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.
            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
            uint256 nextTokenId = tokenId + 1;
            if (_ownerships[nextTokenId].addr == address(0)) {
                // This will suffice for checking _exists(nextTokenId),
                // as a burned slot cannot contain the zero address.
                if (nextTokenId < _currentIndex) {
                    _ownerships[nextTokenId].addr = prevOwnership.addr;
                    _ownerships[nextTokenId].startTimestamp = prevOwnership.startTimestamp;
                }
            }
        }

        emit Transfer(from, to, tokenId);
        _afterTokenTransfers(from, to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        TokenOwnership memory prevOwnership = ownershipOf(tokenId);

        _beforeTokenTransfers(prevOwnership.addr, address(0), tokenId, 1);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId, prevOwnership.addr);

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**128.
        unchecked {
            _addressData[prevOwnership.addr].balance -= 1;
            _addressData[prevOwnership.addr].numberBurned += 1;

            // Keep track of who burned the token, and the timestamp of burning.
            _ownerships[tokenId].addr = prevOwnership.addr;
            _ownerships[tokenId].startTimestamp = uint64(block.timestamp);
            _ownerships[tokenId].burned = true;

            // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.
            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
            uint256 nextTokenId = tokenId + 1;
            if (_ownerships[nextTokenId].addr == address(0)) {
                // This will suffice for checking _exists(nextTokenId),
                // as a burned slot cannot contain the zero address.
                if (nextTokenId < _currentIndex) {
                    _ownerships[nextTokenId].addr = prevOwnership.addr;
                    _ownerships[nextTokenId].startTimestamp = prevOwnership.startTimestamp;
                }
            }
        }

        emit Transfer(prevOwnership.addr, address(0), tokenId);
        _afterTokenTransfers(prevOwnership.addr, address(0), tokenId, 1);

        // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
        unchecked { 
            _burnCounter++;
        }
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(
        address to,
        uint256 tokenId,
        address owner
    ) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert TransferToNonERC721ReceiverImplementer();
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.
     * And also called before burning one token.
     *
     * startTokenId - the first token id to be transferred
     * quantity - the amount to be transferred
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, `tokenId` will be burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _beforeTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}

    /**
     * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes
     * minting.
     * And also called after one token has been burned.
     *
     * startTokenId - the first token id to be transferred
     * quantity - the amount to be transferred
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
     * transferred to `to`.
     * - When `from` is zero, `tokenId` has been minted for `to`.
     * - When `to` is zero, `tokenId` has been burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _afterTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}
}


// File contracts/Collection.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract Collection is ERC721A, Ownable, ReentrancyGuard {
  using Strings for uint256;

  uint256 public constant MAX_SUPPLY = 3000;
  uint256 public constant PRICE = 0.001 ether;
  uint256 public constant MAX_PUBLIC_SALE_PER_WALLET = 5;
  uint256 public constant MAX_PRESALE_PER_WALLET = 3;

  uint256 public immutable maxPublicSaleTx;
  uint256 public immutable maxPresaleTx;

  uint256 public immutable maxSupplyForTeam;
  uint256 public totalSupplyForTeam;

  string private _baseTokenURI;

  bool public isPublicSaleActive = false;
  bool public isPresaleActive = false;
  bool public isRevealActive = false;

  mapping(address => uint256) public presaleCounter;
  mapping(address => uint256) public publicSaleCounter;

  // declare bytes32 variables to store root (a hash)
  bytes32 public merkleRoot;

  constructor(
    string memory name,
    string memory symbol,
    uint256 _maxPublicSaleTx,
    uint256 _maxPresaleTx,
    uint256 _maxSupplyForTeam
  ) ERC721A(name, symbol) {
    maxPublicSaleTx = _maxPublicSaleTx;
    maxPresaleTx = _maxPresaleTx;
    maxSupplyForTeam = _maxSupplyForTeam;
  }

  modifier callerIsUser() {
    require(tx.origin == msg.sender, "The caller is another contract");
    _;
  }

  // function to set the root of Merkle Tree
  function setMerkleRoot(bytes32 _root) external onlyOwner {
    merkleRoot = _root;
  }

  /*
   * Pause sale if active, make active if paused
   */
  function flipIsPublicSaleState() external onlyOwner {
    isPublicSaleActive = !isPublicSaleActive;
  }

  function flipIsPresaleState() external onlyOwner {
    isPresaleActive = !isPresaleActive;
  }

  // Internal for marketing, devs, etc
  function internalMint(uint256 _quantity, address _to) external onlyOwner nonReentrant {
    require(totalSupplyForTeam + _quantity <= maxSupplyForTeam, "Exceeded max supply for team");
    require(totalSupply() + _quantity <= MAX_SUPPLY, "Exceeded max supply");

    _safeMint(_to, _quantity);

    totalSupplyForTeam += _quantity;
  }

  function presaleMint(uint256 _quantity, bytes32[] calldata _merkleProof)
    external
    payable
    callerIsUser
    nonReentrant
  {
    bytes32 leaf = keccak256(abi.encodePacked(msg.sender));

    require(isPresaleActive, "Presale is not active");
    require(
      presaleCounter[msg.sender] + _quantity <= MAX_PRESALE_PER_WALLET,
      "Exceeded max value to purchase"
    );
    require(_quantity <= maxPresaleTx, "Exceeds max per transaction");
    require(totalSupply() + _quantity <= MAX_SUPPLY, "Purchase would exceed max supply");
    require(PRICE * _quantity <= msg.value, "Incorrect funds");
    require(MerkleProof.verify(_merkleProof, merkleRoot, leaf), "Invalid merkle proof");

    _safeMint(msg.sender, _quantity);

    presaleCounter[msg.sender] += _quantity;
  }

  function publicSaleMint(uint256 _quantity) external payable callerIsUser nonReentrant {
    require(isPublicSaleActive, "Public sale is not active");
    require(
      publicSaleCounter[msg.sender] + _quantity <= MAX_PUBLIC_SALE_PER_WALLET,
      "Exceeded max value to purchase"
    );
    require(_quantity <= maxPublicSaleTx, "Exceeds max per transaction");
    require(totalSupply() + _quantity <= MAX_SUPPLY, "Purchase would exceed max supply");
    require(PRICE * _quantity <= msg.value, "Incorrect funds");

    _safeMint(msg.sender, _quantity);

    publicSaleCounter[msg.sender] += _quantity;
  }

  function tokensOfOwner(address _owner) external view returns (uint256[] memory) {
    uint256 tokenCount = balanceOf(_owner);
    uint256[] memory tokensId = new uint256[](tokenCount);
    for (uint256 i = 0; i < tokenCount; i++) {
      tokensId[i] = tokenOfOwnerByIndex(_owner, i);
    }

    return tokensId;
  }

  // metadata URI

  function _baseURI() internal view virtual override returns (string memory) {
    return _baseTokenURI;
  }

  function setBaseURI(string calldata baseURI, bool reveal) external onlyOwner {
    _baseTokenURI = baseURI;
    if (reveal) {
      isRevealActive = reveal;
    }
  }

  function tokenURI(uint256 tokenId) public view override(ERC721A) returns (string memory) {
    require(_exists(tokenId), "Token does not exist");
    if (!isRevealActive) return _baseTokenURI;

    return string(abi.encodePacked(_baseTokenURI, tokenId.toString()));
  }

  function withdraw() external onlyOwner {
    uint256 balance = address(this).balance;
    require(balance > 0, "No ether left to withdraw");
    payable(msg.sender).transfer(balance);
  }
}


// File contracts/CollectionBattle.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract CollectionBattle is VRFConsumerBase, Ownable, KeeperCompatibleInterface {
  using SafeERC20 for IERC20;

  event BattleInitialized();

  /// @notice Event emitted when battle is added.
  event BattleAdded(BattleInfo battle);

  /// @notice Event emitted when battle is executed.
  event BattleExecuted(uint256 battleId, bytes32 requestId);

  /// @notice Event emitted when one nft is eliminated.
  event Eliminated(address gameAddr, uint256 tokenId, uint256 battleId);

  /// @notice Event emitted when winner is set.
  event BattleEnded(address gameAddr, uint256 winnerTokenId);

  /// @notice Event emitted when interval time is set.
  event BattleIntervalTimeSet(uint256 battleId, uint256 intervalTime);

  /// @notice Event emitted when eliminated token count is set.
  event EliminatedTokenCountSet(uint256 battleId, uint256 eliminatedTokenCount);

  /// @notice Event emitted when token ids for battle are added.
  event TokenIdsAdded(address user, uint256 battleId, uint32[] tokenIds);

  /// @notice Event emitted when battle started.
  event BattleStarted(uint256 battleId, BattleInfo battle);

  enum BattleState {
    STANDBY,
    RUNNING,
    ENDED
  }

  bytes32 internal keyHash;
  uint256 public fee;

  mapping(bytes32 => uint256) private requestToBattle;

  struct BattleInfo {
    BattleState battleState;
    address gameAddr;
    address prizeAddr;
    uint32[] inPlay;
    uint32[] outOfPlay;
    uint256 intervalTime;
    uint256 lastEliminatedTime;
    uint256 eliminatedTokenCount;
    uint256 winnerTokenId;
    uint256 prizeTokenId;
  }

  BattleInfo[] public battleQueue;

  uint256 public battleQueueLength;

  /**
   * Constructor inherits VRFConsumerBase
   *
   * Network: Polygon(Matic) Mainnet
   * Chainlink VRF Coordinator address: 0x3d2341ADb2D31f1c5530cDC622016af293177AE0
   * LINK token address:                0xb0897686c545045aFc77CF20eC7A532E3120E0F1
   * Key Hash:                          0xf86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da
   * Fee : 0.0001LINK
   */
  constructor(
    address _vrfCoordinator,
    address _link,
    bytes32 _keyHash,
    uint256 _fee
  )
    VRFConsumerBase(
      _vrfCoordinator, // VRF Coordinator
      _link // LINK Token
    )
  {
    keyHash = _keyHash;
    fee = _fee;
  }

  /**
   * @dev External function to initialize one battle. Set only battle state as STANDBY.
   * @param _gameAddr Battle game address
   * @param _prizeAddr Contract address for prize
   * @param _prizeTokenId Token Id for prize contract
   */
  function initializeBattle(
    address _gameAddr,
    address _prizeAddr,
    uint256 _prizeTokenId
  ) external onlyOwner {
    BattleInfo memory battle;
    battle.gameAddr = _gameAddr;
    battle.prizeAddr = _prizeAddr;
    battle.prizeTokenId = _prizeTokenId;
    battle.battleState = BattleState.STANDBY;

    battleQueue.push(battle);

    battleQueueLength++;

    emit BattleInitialized();
  }

  /**
   * @dev External function to add token ids chosen by users.
   * @param _battleId Battle Queue Id
   * @param _tokenIds TokenIds for each tier chosen by users
   */
  function addTokenIds(uint256 _battleId, uint32[] memory _tokenIds) external onlyOwner {
    require(_battleId < battleQueueLength, "Battle id not exist.");
    BattleInfo storage battle = battleQueue[_battleId];
    require(battle.battleState == BattleState.STANDBY, "Battle already started.");
    battle.inPlay = _tokenIds;

    emit TokenIdsAdded(msg.sender, _battleId, _tokenIds);
  }

  /**
   * @dev External function to add battle. This function can be called only by owner.
   * @param _battleId Battle Queue Id
   */
  function startBattle(
    uint256 _battleId,
    uint256 _intervalTime,
    uint256 _eliminatedTokenCount
  ) external onlyOwner {
    require(_battleId < battleQueueLength, "Battle id not exist.");
    BattleInfo storage battle = battleQueue[_battleId];
    require(battle.battleState == BattleState.STANDBY, "Battle already started.");

    battle.intervalTime = _intervalTime;
    battle.eliminatedTokenCount = _eliminatedTokenCount;
    battle.lastEliminatedTime = block.timestamp;
    battle.battleState = BattleState.RUNNING;

    emit BattleStarted(_battleId, battle);
  }

  /**
   * @dev External function to check if the contract requires work to be done.
   * @param _checkData Data passed to the contract when checking for upkeep.
   * @return upkeepNeeded boolean to indicate whether the keeper should call performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if upkeep is needed.
   */
  function checkUpkeep(bytes calldata _checkData)
    external
    view
    override
    returns (bool, bytes memory)
  {
    for (uint256 i = 0; i < battleQueueLength; i++) {
      BattleInfo memory battle = battleQueue[i];
      if (
        battle.battleState == BattleState.RUNNING &&
        block.timestamp >= battle.lastEliminatedTime + (battle.intervalTime * 1 minutes)
      ) {
        return (true, abi.encodePacked(i));
      }
    }
    return (false, _checkData);
  }

  /**
   * @dev Performs work on the contract. Executed by the keepers, via the registry.
   * @param _performData is the data which was passed back from the checkData simulation.
   */
  function performUpkeep(bytes calldata _performData) external override {
    uint256 battleId = bytesToUint256(_performData, 0);
    BattleInfo memory battle = battleQueue[battleId];

    require(battle.battleState == BattleState.RUNNING, "Current battle is finished");
    require(
      block.timestamp >= battle.lastEliminatedTime + (battle.intervalTime * 1 minutes),
      "Trigger time is not correct"
    );

    executeBattle(battleId);
  }

  /**
   * @dev Internal function to execute battle.
   * @param _battleId Battle Id
   */
  function executeBattle(uint256 _battleId) internal {
    BattleInfo storage battle = battleQueue[_battleId];

    require(LINK.balanceOf(address(this)) >= fee, "Not enough LINK");
    require(battle.battleState == BattleState.RUNNING, "Current battle is finished");

    bytes32 requestId = requestRandomness(keyHash, fee);
    requestToBattle[requestId] = _battleId;
    battle.lastEliminatedTime = block.timestamp;

    emit BattleExecuted(_battleId, requestId);
  }

  /**
   * @dev Callback function used by VRF Coordinator.
   * @param _requestId Request Id
   * @param _randomness Random Number
   */
  function fulfillRandomness(bytes32 _requestId, uint256 _randomness) internal override {
    uint256 _battleId = requestToBattle[_requestId];
    BattleInfo storage battle = battleQueue[_battleId];
    uint256 eliminatedTokenCount = battle.eliminatedTokenCount;

    if (eliminatedTokenCount >= battle.inPlay.length) {
      eliminatedTokenCount = battle.inPlay.length - 1;
    }

    for (uint256 index = 0; index < eliminatedTokenCount; index++) {
      uint256 i = uint256(keccak256(abi.encode(_randomness, index, block.timestamp))) %
        battle.inPlay.length;

      uint32 tokenId = battle.inPlay[i];

      battle.outOfPlay.push(tokenId);
      battle.inPlay[i] = battle.inPlay[battle.inPlay.length - 1];
      battle.inPlay.pop();

      emit Eliminated(battle.gameAddr, tokenId, _battleId);
    }

    if (battle.inPlay.length == 1) {
      battle.battleState = BattleState.ENDED;
      battle.winnerTokenId = battle.inPlay[0];
      emit BattleEnded(battle.gameAddr, battle.winnerTokenId);
    }
  }

  /**
   * @dev External function to set battle interval time. This function can be called only by owner.
   * @param _battleId Battle Id
   * @param _intervalTime New interval time
   */
  function setBattleIntervalTime(uint256 _battleId, uint256 _intervalTime) external onlyOwner {
    require(_battleId < battleQueueLength, "Battle id not exist.");

    BattleInfo storage battle = battleQueue[_battleId];
    battle.intervalTime = _intervalTime;

    emit BattleIntervalTimeSet(_battleId, _intervalTime);
  }

  /**
   * @dev External function to set eliminated token count. This function can be called only by owner.
   * @param _battleId Battle Id
   * @param _eliminatedTokenCount New eliminated token count
   */
  function setEliminatedTokenCount(uint256 _battleId, uint256 _eliminatedTokenCount)
    external
    onlyOwner
  {
    require(_battleId < battleQueueLength, "Battle id not exist.");

    BattleInfo storage battle = battleQueue[_battleId];
    battle.eliminatedTokenCount = _eliminatedTokenCount;

    emit EliminatedTokenCountSet(_battleId, _eliminatedTokenCount);
  }

  /**
   * @dev External function to get in-play tokens.
   * @param _battleId Battle Id
   */
  function getInPlay(uint256 _battleId) external view returns (uint32[] memory) {
    return battleQueue[_battleId].inPlay;
  }

  /**
   * @dev External function to get out-play tokens.
   * @param _battleId Battle Id
   */
  function getOutPlay(uint256 _battleId) external view returns (uint32[] memory) {
    return battleQueue[_battleId].outOfPlay;
  }

  /**
   * Fallback function to receive ETH
   */
  receive() external payable {}

  /**
   * @dev External function to get the current link balance in contract.
   */
  function getCurrentLinkBalance() external view returns (uint256) {
    return LINK.balanceOf(address(this));
  }

  /**
   * @dev External function to withdraw ETH in contract. This function can be called only by owner.
   * @param _amount ETH amount
   */
  function withdrawETH(uint256 _amount) external onlyOwner {
    uint256 balance = address(this).balance;
    require(_amount <= balance, "Out of balance");

    payable(msg.sender).transfer(_amount);
  }

  /**
   * @dev External function to withdraw ERC-20 tokens in contract. This function can be called only by owner.
   * @param _tokenAddr Address of ERC-20 token
   * @param _amount ERC-20 token amount
   */
  function withdrawERC20Token(address _tokenAddr, uint256 _amount) external onlyOwner {
    IERC20 token = IERC20(_tokenAddr);

    uint256 balance = token.balanceOf(address(this));
    require(_amount <= balance, "Out of balance");

    token.safeTransfer(msg.sender, _amount);
  }

  /**
   * @dev Internal function to convert bytes to uint256.
   * @param _bytes value
   * @param _start Start index
   */
  function bytesToUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
    require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
    uint256 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x20), _start))
    }

    return tempUint;
  }
}


// File contracts/CollectionPrize.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract CollectionPrize is ERC721URIStorage, Ownable {
  string public baseURI;
  uint256 public totalSupply;

  constructor() ERC721("niftyroyaleprize", "NIFTYROYALEPRIZE") {}

  /**
   * @dev External function to mint tokens.
   * @param _tokenURI Token amount to buy
   */
  function mint(string memory _tokenURI) external onlyOwner {
    uint256 tokenId = totalSupply + 1;
    _safeMint(msg.sender, tokenId);
    string memory tokenURI = string(abi.encodePacked(baseURI, _tokenURI));
    _setTokenURI(tokenId, tokenURI);
    totalSupply++;
  }

  /**
   * @dev External function to set the base token URI. This function can be called only by owner.
   * @param _baseURI New base token uri
   */
  function setBaseURI(string memory _baseURI) external onlyOwner {
    baseURI = _baseURI;
  }
}


// File contracts/MYSTCLGenesis.sol

// License-Identifier: MIT
pragma solidity ^0.8.6;
contract MYSTCLGenesis is ERC721A, Ownable, ReentrancyGuard {
  using Strings for uint256;

  /// @notice Event emitted when user minted tokens.
  event Minted(address user, uint256 quantity, uint256 totalSupply);
  event IsPublicSaleActiveSet(bool state);
  event IsPresaleActiveSet(bool state);
  event PriceSet(uint256 price);

  uint256 public immutable maxSupply;
  uint256 public immutable maxPubTokensPerWallet;
  uint256 public immutable maxPreTokensPerWallet;
  uint256 public immutable maxPubTokensPerTx;
  uint256 public immutable maxPreTokensPerTx;
  uint256 public immutable maxSupplyForTeam;
  uint256 public price;
  uint256 public totalSupplyForTeam;

  string private _baseTokenURI;

  bool public isPublicSaleActive = false;
  bool public isPresaleActive = false;
  bool public isRevealActive = false;

  mapping(address => uint256) public presaleCounter;
  mapping(address => uint256) public publicSaleCounter;

  // declare bytes32 variables to store root (a hash)
  bytes32 public merkleRoot;

  constructor(
    string memory name,
    string memory symbol,
    uint256 _maxPubTokensPerTx,
    uint256 _maxPreTokensPerTx,
    uint256 _maxSupplyForTeam,
    uint256 _maxSupply,
    uint256 _price,
    uint256 _maxPubTokensPerWallet,
    uint256 _maxPreTokensPerWallet
  ) ERC721A(name, symbol) {
    maxPubTokensPerTx = _maxPubTokensPerTx;
    maxPreTokensPerTx = _maxPreTokensPerTx;
    maxSupplyForTeam = _maxSupplyForTeam;
    maxSupply = _maxSupply;
    price = _price;
    maxPubTokensPerWallet = _maxPubTokensPerWallet;
    maxPreTokensPerWallet = _maxPreTokensPerWallet;
  }

  modifier callerIsUser() {
    require(tx.origin == msg.sender, "The caller is another contract");
    _;
  }

  // function to set the root of Merkle Tree
  function setMerkleRoot(bytes32 _root) external onlyOwner {
    merkleRoot = _root;
  }

  /*
   * Pause sale if active, make active if paused
   */
  function flipIsPublicSaleState() external onlyOwner {
    isPublicSaleActive = !isPublicSaleActive;

    emit IsPublicSaleActiveSet(isPublicSaleActive);
  }

  function flipIsPresaleState() external onlyOwner {
    isPresaleActive = !isPresaleActive;

    emit IsPresaleActiveSet(isPresaleActive);
  }

  // Internal for marketing, devs, etc
  function internalMint(uint256 _quantity, address _to) external onlyOwner nonReentrant {
    require(totalSupplyForTeam + _quantity <= maxSupplyForTeam, "Exceeded max supply for team");
    require(totalSupply() + _quantity <= maxSupply, "Exceeded max supply");

    _safeMint(_to, _quantity);

    totalSupplyForTeam += _quantity;

    emit Minted(_to, _quantity, totalSupply());
  }

  function presaleMint(uint256 _quantity, bytes32[] calldata _merkleProof)
    external
    payable
    callerIsUser
    nonReentrant
  {
    bytes32 leaf = keccak256(abi.encodePacked(msg.sender));

    require(isPresaleActive, "Presale is not active");
    require(
      presaleCounter[msg.sender] + _quantity <= maxPreTokensPerWallet,
      "Exceeded max value to purchase"
    );
    require(_quantity <= maxPreTokensPerTx, "Exceeds max per transaction");
    require(totalSupply() + _quantity <= maxSupply, "Purchase would exceed max supply");
    require(price * _quantity <= msg.value, "Incorrect funds");
    require(MerkleProof.verify(_merkleProof, merkleRoot, leaf), "Invalid merkle proof");

    _safeMint(msg.sender, _quantity);

    presaleCounter[msg.sender] += _quantity;

    emit Minted(msg.sender, _quantity, totalSupply());
  }

  function publicSaleMint(uint256 _quantity) external payable callerIsUser nonReentrant {
    require(isPublicSaleActive, "Public sale is not active");
    require(
      publicSaleCounter[msg.sender] + _quantity <= maxPubTokensPerWallet,
      "Exceeded max value to purchase"
    );
    require(_quantity <= maxPubTokensPerTx, "Exceeds max per transaction");
    require(totalSupply() + _quantity <= maxSupply, "Purchase would exceed max supply");
    require(price * _quantity <= msg.value, "Incorrect funds");

    _safeMint(msg.sender, _quantity);

    publicSaleCounter[msg.sender] += _quantity;

    emit Minted(msg.sender, _quantity, totalSupply());
  }

  function tokensOfOwner(address _owner) external view returns (uint256[] memory) {
    uint256 tokenCount = balanceOf(_owner);
    uint256[] memory tokensId = new uint256[](tokenCount);
    for (uint256 i = 0; i < tokenCount; i++) {
      tokensId[i] = tokenOfOwnerByIndex(_owner, i);
    }

    return tokensId;
  }

  // metadata URI

  function _baseURI() internal view virtual override returns (string memory) {
    return _baseTokenURI;
  }

  function setBaseURI(string calldata baseURI, bool reveal) external onlyOwner {
    _baseTokenURI = baseURI;
    if (reveal) {
      isRevealActive = reveal;
    }
  }

  function tokenURI(uint256 tokenId) public view override(ERC721A) returns (string memory) { // be sure to add trailing slash to base uri
    require(_exists(tokenId), "Token does not exist");
    if (!isRevealActive) return _baseTokenURI;

    // Append '.json' at the end
    return string(abi.encodePacked(_baseTokenURI, tokenId.toString(), ".json"));
  }


  function setPrice(uint256 _price) external onlyOwner {
    price = _price;

    emit PriceSet(price);
  }

  function withdraw() external onlyOwner {
    uint256 balance = address(this).balance;
    require(balance > 0, "No ether left to withdraw");
    payable(msg.sender).transfer(balance);
  }
}