Big Bank Theory

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.9;

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);
}

interface VRFCoordinatorV2Interface {
    /**
     * @notice Get configuration relevant for making requests
     * @return minimumRequestConfirmations global min for request confirmations
     * @return maxGasLimit global max for request gas limit
     * @return s_provingKeyHashes list of registered key hashes
     */
    function getRequestConfig()
        external
        view
        returns (
            uint16,
            uint32,
            bytes32[] memory
        );

    /**
     * @notice Request a set of random words.
     * @param keyHash - Corresponds to a particular oracle job which uses
     * that key for generating the VRF proof. Different keyHash's have different gas price
     * ceilings, so you can select a specific one to bound your maximum per request cost.
     * @param subId  - The ID of the VRF subscription. Must be funded
     * with the minimum subscription balance required for the selected keyHash.
     * @param minimumRequestConfirmations - How many blocks you'd like the
     * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
     * for why you may want to request more. The acceptable range is
     * [minimumRequestBlockConfirmations, 200].
     * @param callbackGasLimit - How much gas you'd like to receive in your
     * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
     * may be slightly less than this amount because of gas used calling the function
     * (argument decoding etc.), so you may need to request slightly more than you expect
     * to have inside fulfillRandomWords. The acceptable range is
     * [0, maxGasLimit]
     * @param numWords - The number of uint256 random values you'd like to receive
     * in your fulfillRandomWords callback. Note these numbers are expanded in a
     * secure way by the VRFCoordinator from a single random value supplied by the oracle.
     * @return requestId - A unique identifier of the request. Can be used to match
     * a request to a response in fulfillRandomWords.
     */
    function requestRandomWords(
        bytes32 keyHash,
        uint64 subId,
        uint16 minimumRequestConfirmations,
        uint32 callbackGasLimit,
        uint32 numWords
    ) external returns (uint256 requestId);

    /**
     * @notice Create a VRF subscription.
     * @return subId - A unique subscription id.
     * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
     * @dev Note to fund the subscription, use transferAndCall. For example
     * @dev  LINKTOKEN.transferAndCall(
     * @dev    address(COORDINATOR),
     * @dev    amount,
     * @dev    abi.encode(subId));
     */
    function createSubscription() external returns (uint64 subId);

    /**
     * @notice Get a VRF subscription.
     * @param subId - ID of the subscription
     * @return balance - LINK balance of the subscription in juels.
     * @return reqCount - number of requests for this subscription, determines fee tier.
     * @return owner - owner of the subscription.
     * @return consumers - list of consumer address which are able to use this subscription.
     */
    function getSubscription(uint64 subId)
        external
        view
        returns (
            uint96 balance,
            uint64 reqCount,
            address owner,
            address[] memory consumers
        );

    /**
     * @notice Request subscription owner transfer.
     * @param subId - ID of the subscription
     * @param newOwner - proposed new owner of the subscription
     */
    function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner)
        external;

    /**
     * @notice Request subscription owner transfer.
     * @param subId - ID of the subscription
     * @dev will revert if original owner of subId has
     * not requested that msg.sender become the new owner.
     */
    function acceptSubscriptionOwnerTransfer(uint64 subId) external;

    /**
     * @notice Add a consumer to a VRF subscription.
     * @param subId - ID of the subscription
     * @param consumer - New consumer which can use the subscription
     */
    function addConsumer(uint64 subId, address consumer) external;

    /**
     * @notice Remove a consumer from a VRF subscription.
     * @param subId - ID of the subscription
     * @param consumer - Consumer to remove from the subscription
     */
    function removeConsumer(uint64 subId, address consumer) external;

    /**
     * @notice Cancel a subscription
     * @param subId - ID of the subscription
     * @param to - Where to send the remaining LINK to
     */
    function cancelSubscription(uint64 subId, address to) external;
}

/** ****************************************************************************
 * @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. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @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     constructor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) 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). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev 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.
 *
 * *****************************************************************************
 * @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 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. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
    error OnlyCoordinatorCanFulfill(address have, address want);
    address private immutable vrfCoordinator;

    /**
     * @param _vrfCoordinator address of VRFCoordinator contract
     */
    constructor(address _vrfCoordinator) {
        vrfCoordinator = _vrfCoordinator;
    }

    /**
     * @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 VRFConsumerBaseV2 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 randomWords the VRF output expanded to the requested number of words
     */
    function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords)
        internal
        virtual;

    // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
    // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
    // the origin of the call
    function rawFulfillRandomWords(
        uint256 requestId,
        uint256[] memory randomWords
    ) external {
        if (msg.sender != vrfCoordinator) {
            revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
        }
        fulfillRandomWords(requestId, randomWords);
    }
}

/**
 * @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;
    }
}

/**
 * @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);
}

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(
            fromBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(
                currentAllowance >= amount,
                "ERC20: insufficient allowance"
            );
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

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

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

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

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

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

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

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

interface ILizzieWizzie {
    function mintFromGame(address to) external;

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

    function encounteredLizzieWizzie(address who) external view returns (bool);

    function rememberEncounter(address who) external;

    function getAmountMintedFromGame() external view returns (uint256);

    function getMaxMintedFromGame() external view returns (uint256);

    function getTotalSupply() external view returns (uint256);
}

interface IDividendDistributor {
    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external;

    function setShare(address shareholder, uint256 amount) external;

    function deposit() external payable;

    function process(uint256 gas) external;
}

contract BigBankTheory is ERC20, Ownable, VRFConsumerBaseV2 {
    // Basic units
    uint256 private constant ONE_HOUR = 60 * 60;
    uint256 private constant PERCENT_DENOMENATOR = 1000;
    address private constant DEAD = address(0xdead);

    // Mandatory things for Chainlink VRF
    VRFCoordinatorV2Interface vrfCoord;
    LinkTokenInterface link;
    uint64 private _vrfSubscriptionId;
    bytes32 private _vrfKeyHash;
    uint32 private _vrfCallbackGasLimit = 600000;

    // Wager Amounts

    // requestId (vrf) and player address
    mapping(uint256 => address) private _wagerInit;
    // Who wagered how much
    mapping(address => uint256) private _wagerInitAmount;
    // Total wagered amount
    uint256 private _wagerBalance;

    // Rock, Paper, Scissors, Lizard, Spock Game turned on/off
    bool public rpslsGameOn = true;

    // Possible Moves (experimental)
    enum Move {
        ROCK,
        PAPER,
        SCISSORS,
        LIZARD,
        SPOCK
    }

    event LizardWizard(
        address indexed who,
        uint256 wagerAmount,
        uint256 chainlinkPlayed
    );
    event Rektage(address indexed who, uint256 wagerAmount, Move playerMove);

    // What the player played against Chainlink
    mapping(uint256 => Move) private _playedAgainstChainlink;

    // The least amount of % needed for a bet
    uint256 public RPSLSMinBalancePerc = (PERCENT_DENOMENATOR * 30) / 100; // 30% user's balance

    // How much one gets for a win
    uint256 public RPSLSWinPercentage = (PERCENT_DENOMENATOR * 80) / 100; // 80% wager amount

    // How much is returned upon draw
    uint256 public RPSLSDrawPercentage = (PERCENT_DENOMENATOR * 97) / 100; // uint256 = 970 => 97% wager amount

    // How much is taxed upon a loss (the rest is burned)
    uint256 public RPSLSLoseTaxPercentage = (PERCENT_DENOMENATOR * 10) / 100; // 10% is sent to the treasury (Dev & Marketing + LP Nuke & Reward Pool), the rest is burnt

    // RPSLS stats
    struct rpsls {
        uint256 wins;
        uint256 loses;
        uint256 draws;
        uint256 amountWon;
        uint256 amountLost;
    }
    mapping(Move => rpsls) public rpslsStats;

    // Hourly Biggest Buyer Rewards
    uint256 public biggestBuyRewardPercentage =
        (PERCENT_DENOMENATOR * 25) / 100; // 25%
    mapping(uint256 => address) public biggestBuyer;
    mapping(uint256 => uint256) public biggestBuyerAmount;
    mapping(uint256 => uint256) public biggestBuyerPaid;

    // recording player stats
    struct stats {
        uint256 wins;
        uint256 amountWon;
        uint256 loses;
        uint256 amountLost;
        uint256 draws;
    }
    mapping(address => stats) public playerStats;

    // LP Nuke Mechanism
    address private _nukeRecipient = DEAD;
    uint256 public lpNukeBuildup;
    uint256 public nukePercentPerSell = (PERCENT_DENOMENATOR * 25) / 100; // 25%
    bool public lpNukeEnabled = true;

    address public devAndMarketingWallet =
        0xcd05297a00c3d71c98F34C21dc4cfAD551C01cc1;

    address public RewardPool = 0x7E12951324ED10ee6EE0Ee8bd35babc76259148E;

    // who doesn't pay tax
    mapping(address => bool) private _isTaxExcluded;
    uint256 public taxLp = (PERCENT_DENOMENATOR * 1) / 100; // 1%
    uint256 public taxRewardPool = (PERCENT_DENOMENATOR * 1) / 100; // 1%
    uint256 public taxMarketingAndDevelopment = (PERCENT_DENOMENATOR * 1) / 100; // 1%
    uint256 public sellTaxUnwageredMultiplier = 4; // init 12% (3% * 4) (Note: 3% is the sum of TaxLp + taxRewardPool + taxMarketingAndDevelopment)
    uint256 private _totalTax;
    bool private _taxesOff; // are taxes enabled or not
    mapping(address => bool) public canSellWithoutElevation; // who has lowered sell tax

    uint256 public maxBuy = (PERCENT_DENOMENATOR * 2) / 100; // 2%
    uint256 public maxSell = (PERCENT_DENOMENATOR * 1) / 100; // 1%

    // Adding to Liquidity
    uint256 private _liquifyRate = (PERCENT_DENOMENATOR * 1) / 100; // 1%

    // Time units
    uint256 public launchTime;
    uint256 private _launchBlock;

    // Uniswap addresses
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    // Lizzy Wizzy Contract
    ILizzieWizzie public LizzieWizzieNFTs;

    // Blacklisted Bots
    mapping(address => bool) public _isBot;

    // Top players
    struct topStat {
        address who;
        uint256 amount;
    }

    topStat public biggestWin = topStat(DEAD, 0);
    topStat public biggestLoss = topStat(DEAD, 0);

    event newBiggestWinner(address indexed who, uint256 amount);
    event newBiggestLoser(address indexed who, uint256 amount);

    // Dividend contract
    IDividendDistributor public dividendDistributor;

    // Swapping variables and swapLock
    bool private _swapEnabled = true;
    bool private _swapping = false;

    modifier swapLock() {
        _swapping = true;
        _;
        _swapping = false;
    }

    // Events
    event InitiatedRPSLSvsChainlink(
        address indexed wagerer,
        uint256 indexed requestId,
        Move indexed hand,
        uint256 amountWagered
    );

    event SettledRPSLSvsChainlink(
        address indexed wagerer,
        uint256 requestId,
        uint256 amountWagered,
        Move indexed hand,
        uint256 indexed chainlinkPlayed,
        uint8 result
    );

    constructor()
        ERC20("Big Bank Theory", "BBT")
        VRFConsumerBaseV2(0x271682DEB8C4E0901D1a1550aD2e64D568E69909)
    {
        _mint(address(this), 1_000_000 * 10**18);

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        uniswapV2Router = _uniswapV2Router;
        _setTotalTax();
        // The Government does not pay taxes
        _isTaxExcluded[address(this)] = true;
        _isTaxExcluded[msg.sender] = true;

        vrfCoord = VRFCoordinatorV2Interface(
            0x271682DEB8C4E0901D1a1550aD2e64D568E69909
        );
        link = LinkTokenInterface(0x514910771AF9Ca656af840dff83E8264EcF986CA);
        _vrfSubscriptionId = 157;
        _vrfKeyHash = 0x8af398995b04c28e9951adb9721ef74c74f93e6a478f39e7e0777be13527e7ef;

        LizzieWizzieNFTs = ILizzieWizzie(
            0x361641f29dF1F79A0F664B2Bef03c4b5b15BA423
        );
    }

    // _percent: 1 == 0.1%, 1000 = 100%
    function launch(uint16 _percent) external payable onlyOwner {
        require(_percent <= PERCENT_DENOMENATOR, "must be between 0-100%");
        require(launchTime == 0, "already launched");
        require(_percent == 0 || msg.value > 0, "need ETH for initial LP");

        uint256 _lpSupply = (totalSupply() * _percent) / PERCENT_DENOMENATOR;
        uint256 _leftover = totalSupply() - _lpSupply;
        if (_lpSupply > 0) {
            _addLp(_lpSupply, msg.value);
        }
        if (_leftover > 0) {
            _transfer(address(this), owner(), _leftover);
        }
        launchTime = block.timestamp;
        _launchBlock = block.number;
    }

    // Game logic with Chainlink
    function playWithChainlink(uint16 _percent, Move _hand) public {
        require(rpslsGameOn, "Game is turned off at the moment");
        require(balanceOf(msg.sender) > 0, "must have a bag to wager");
        require(
            _percent >= RPSLSMinBalancePerc && _percent <= PERCENT_DENOMENATOR,
            "must wager between minimum % amount and your entire bag"
        );
        require(_wagerInitAmount[msg.sender] == 0, "already initiated");

        // final amount of tokens wagered
        uint256 _finalWagerAmount = (balanceOf(msg.sender) * _percent) /
            PERCENT_DENOMENATOR;

        // transfers the tokens to contract
        _transfer(msg.sender, address(this), _finalWagerAmount);
        // adds to the wager balance in contract, so we can distinguish how many tokens are really in the contract without the wager amounts
        _wagerBalance += _finalWagerAmount;

        // requests an rng from chainlink vrf
        uint256 requestId = vrfCoord.requestRandomWords(
            _vrfKeyHash,
            _vrfSubscriptionId,
            uint16(3),
            _vrfCallbackGasLimit,
            uint16(1)
        );

        // remembers the player's move for requestId
        _playedAgainstChainlink[requestId] = _hand;
        // assigns the player to requestId
        _wagerInit[requestId] = msg.sender;

        _wagerInitAmount[msg.sender] = _finalWagerAmount;
        // lowers the sell tax
        canSellWithoutElevation[msg.sender] = true;

        emit InitiatedRPSLSvsChainlink(
            msg.sender,
            requestId,
            _hand,
            _finalWagerAmount
        );
    }

    function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords)
        internal
        override
    {
        _settleRPSLSvsChainlink(requestId, randomWords[0]);
    }

    function manualFulfillRandomWords(
        uint256 requestId,
        uint256[] memory randomWords
    ) external onlyOwner {
        _settleRPSLSvsChainlink(requestId, randomWords[0]);
    }

    function _settleRPSLSvsChainlink(uint256 requestId, uint256 randomNumber)
        private
    {
        // who is playing according to the requestId
        address _user = _wagerInit[requestId];
        require(_user != address(0), "rpslp record does not exist");

        // get the amount wagered
        uint256 _amountWagered = _wagerInitAmount[_user];
        // get what the player had played
        Move _move = _playedAgainstChainlink[requestId];
        // rng for lizzieWizze/Rektage finger
        uint256 rektageOrNot = randomNumber % 100;
        bool lizzyWizzy = false;
        bool rektage = false;
        uint256 rng = randomNumber % 5;
        uint8 result;

        // There is a special chance for a Lizard Wizard, only when Lizard is played
        uint8 lizzyWizzyTolerance = 2;

        if (LizzieWizzieNFTs.balanceOf(_user) > 0) {
            unchecked {
                ++lizzyWizzyTolerance;
            }
        }

        if (rektageOrNot < 1) {
            // Rektage Finger
            rektage = true;
            emit Rektage(_user, _amountWagered, _move);
        } else if (rektageOrNot < lizzyWizzyTolerance) {
            // Lizard Wizard
            lizzyWizzy = true;
        }

        if (_move == Move.LIZARD && lizzyWizzy) {
            // Instantly wins due to LizzyWizzy condition
            uint256 _amountToWin = (_amountWagered / PERCENT_DENOMENATOR) *
                RPSLSWinPercentage;
            _transfer(address(this), _user, _amountWagered); // transfers back the amount wagered
            _mint(_user, _amountToWin); // mints win % of the amount wagered
            // counting player stats
            playerStats[_user].wins++; // add a win
            playerStats[_user].amountWon += _amountToWin; // add amount won
            // hand stats
            rpslsStats[_move].wins++; // hand wins
            rpslsStats[_move].amountWon += _amountToWin; // hand amount won
            // won
            result = 1;
            // compare with the biggest winner
            if (_amountToWin > biggestWin.amount) {
                biggestWin = topStat(_user, _amountToWin);
                emit newBiggestWinner(_user, _amountToWin);
            }
            emit LizardWizard(_user, _amountWagered, rng);

            // if the player hasn't encountered LizzyWizzy yet
            if (!LizzieWizzieNFTs.encounteredLizzieWizzie(_user)) {
                // and the amount of NFTs allocated to be minted from games has not been reached yet
                if (
                    LizzieWizzieNFTs.getAmountMintedFromGame() <
                    LizzieWizzieNFTs.getMaxMintedFromGame()
                ) {
                    // remember that the player has encountered LizzyWizzy via game
                    LizzieWizzieNFTs.rememberEncounter(_user);
                    // mint an NFT for them
                    LizzieWizzieNFTs.mintFromGame(_user);
                }
            }
        } else if (rektage || rng > 2) {
            uint256 amountToTax = (_amountWagered * RPSLSLoseTaxPercentage) /
                PERCENT_DENOMENATOR;
            // transfer half of the tax to the devAndMarketing wallet
            _transfer(address(this), devAndMarketingWallet, amountToTax / 2);
            // burn the wagered amount - tax
            uint256 burnAmount = _amountWagered - amountToTax;
            _burn(address(this), burnAmount);

            // counting player stats
            playerStats[_user].loses++; // add a loss
            playerStats[_user].amountLost += _amountWagered; // add amount lost
            // hand stats
            rpslsStats[_move].loses++; // add a hand loss
            rpslsStats[_move].amountLost += _amountWagered; // add amount lost
            // lost
            result = 0;
            // checks for the biggest loser
            if (_amountWagered > biggestLoss.amount) {
                biggestLoss = topStat(_user, _amountWagered);
                emit newBiggestLoser(_user, _amountWagered);
            }
        } else if (rng > 0) {
            // calculates how much to win
            uint256 _amountToWin = (_amountWagered / PERCENT_DENOMENATOR) *
                RPSLSWinPercentage;
            // returns the amount of tokens wagered
            _transfer(address(this), _user, _amountWagered);
            // mints win % of the amount wagered
            _mint(_user, _amountToWin);
            // counting player stats
            playerStats[_user].wins++; // add a win
            playerStats[_user].amountWon += _amountToWin; // add amount won
            // counting hand stats
            rpslsStats[_move].wins++; // add a hand win
            rpslsStats[_move].amountWon += _amountToWin; // add amount won
            // won
            result = 1;
            // check for the biggest winner
            if (_amountToWin > biggestWin.amount) {
                biggestWin = topStat(_user, _amountToWin);
                emit newBiggestWinner(_user, _amountToWin);
            }
        } else {
            // return the amount wagered - draw tax
            _transfer(
                address(this),
                _user,
                (_amountWagered / PERCENT_DENOMENATOR) * RPSLSDrawPercentage
            );
            // counting player stats
            playerStats[_user].draws++; // add a draw
            // counting hand stats
            rpslsStats[_move].draws++; // add a draw
            // draw
            result = 2;
        }

        // subtract the amount wagered from the wager balance, so now it counts as contract balance
        _wagerBalance -= _amountWagered;
        // delete variables to refund some gas?
        delete _wagerInit[requestId];
        // reset to allow wagering again
        delete _wagerInitAmount[_user];
        emit SettledRPSLSvsChainlink(
            _user,
            requestId,
            _amountWagered,
            _move,
            rng,
            result
        );
        delete _playedAgainstChainlink[requestId];
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual override {
        bool _isOwner = sender == owner() ||
            recipient == owner() ||
            sender == address(this) ||
            recipient == address(this);
        uint256 contractTokenBalance = balanceOf(address(this)) - _wagerBalance;

        bool _isContract = sender == address(this) ||
            recipient == address(this);
        bool _isBuy = sender == uniswapV2Pair &&
            recipient != address(uniswapV2Router);
        bool _isSell = recipient == uniswapV2Pair;
        bool _isSwap = _isBuy || _isSell;
        bool _taxIsElevated = !canSellWithoutElevation[sender];
        uint256 _hourAfterLaunch = getHour();

        if (_isBuy) {
            // resets the tax status
            canSellWithoutElevation[recipient] = false;
            // a highly complex method to fight against bots, taken from Smolting Inu, lol
            if (block.number <= _launchBlock + 2) {
                _isBot[recipient] = true;
            } else if (amount > biggestBuyerAmount[_hourAfterLaunch]) {
                // checking for the biggest buyer
                biggestBuyer[_hourAfterLaunch] = recipient;
                biggestBuyerAmount[_hourAfterLaunch] = amount;
            }
        } else {
            // fuck bots
            require(!_isBot[recipient], "Stop botting!");
            require(!_isBot[sender], "Stop botting!");
            require(!_isBot[_msgSender()], "Stop botting!");

            // if it isn't a sell nor a contract transaction at the same time, it resets the tax exemption status (taken from Smolting Inu)
            if (!_isSell && !_isContract) {
                canSellWithoutElevation[recipient] = false;
            }
        }

        // calculates the liquify rate (1% at launch), i.e. how many % of liquidity before adding to LP (for it to be worth it)
        uint256 _minSwap = (balanceOf(uniswapV2Pair) * _liquifyRate) /
            PERCENT_DENOMENATOR;
        // checks, whether there is a sufficient amount of tokens
        bool _overMin = contractTokenBalance >= _minSwap;
        // if the amount of tokens is sufficient, the contract proceeds to add to the LP
        if (
            _swapEnabled &&
            !_swapping &&
            !_isOwner &&
            _overMin &&
            launchTime != 0 &&
            sender != uniswapV2Pair
        ) {
            _swap(_minSwap);
        }

        // initiated tax at 0, the tax will be calculated at each step
        uint256 tax = 0;
        if (
            launchTime != 0 &&
            _isSwap &&
            !_taxesOff &&
            !(_isTaxExcluded[sender] || _isTaxExcluded[recipient])
        ) {
            // if it's a swap, then regular taxes apply
            tax = (amount * _totalTax) / PERCENT_DENOMENATOR;
            if (tax > 0) {
                if (_isSell && _taxIsElevated) {
                    require(
                        _isOwner ||
                            amount <=
                            ((totalSupply() / PERCENT_DENOMENATOR) * maxSell),
                        "ERC20: exceed max transaction"
                    );
                    // below is logic for sell

                    // whatever the sellTaxUnwageredMultiplier is (let's call it n), we take 1/n to burn and the rest (n-1)/n is divided between Buyer Rewards, LP and Dev and Marketing Wallet
                    _burn(sender, tax);

                    // amount of tokens to divide between different taxes, except burn
                    uint256 taxWithoutBurn = tax *
                        (sellTaxUnwageredMultiplier - 1);

                    // this is total tax
                    tax *= sellTaxUnwageredMultiplier;

                    // tax for LPing and tax from buys (used mainly for biggest hourly rewards) are sent to the contract address
                    super._transfer(
                        sender,
                        address(this),
                        (taxWithoutBurn * (taxLp + taxRewardPool)) / _totalTax
                    );

                    // then a part is taken for development and marketing
                    super._transfer(
                        sender,
                        devAndMarketingWallet,
                        (taxWithoutBurn * taxMarketingAndDevelopment) /
                            _totalTax
                    );
                } else {
                    if (_isBuy) {
                        require(
                            _isOwner ||
                                amount <=
                                ((totalSupply() / PERCENT_DENOMENATOR) *
                                    maxBuy),
                            "ERC20: exceed max transaction"
                        );
                    } else if (_isSell) {
                        require(
                            _isOwner ||
                                amount <=
                                ((totalSupply() / PERCENT_DENOMENATOR) *
                                    maxSell),
                            "ERC20: exceed max transaction"
                        );
                    }
                    // either buy, or sell after playing a game
                    // again, tax for LPing and tax from buys is sent to the contract address
                    super._transfer(
                        sender,
                        address(this),
                        (tax * (taxLp + taxRewardPool)) / _totalTax
                    );
                    // the rest is taken for marketing and development
                    super._transfer(
                        sender,
                        devAndMarketingWallet,
                        (tax * taxMarketingAndDevelopment) / _totalTax
                    );
                }
            }
        }

        // transfer the rest
        super._transfer(sender, recipient, (amount - tax));

        // if it is a sell and the sender isn't the smart contract itself, it adds to the lpNukeBuildup
        if (_isSell && sender != address(this)) {
            lpNukeBuildup +=
                ((amount - tax) * nukePercentPerSell) /
                PERCENT_DENOMENATOR;
        }
    }

    function _swap(uint256 _amountToSwap) private swapLock {
        uint256 balBefore = address(this).balance;
        /**  
        how many tokens are needed to pair up the liquidity,
        the contract balance consists of tokens to be used for Hourly Biggest Rewards and adding to LP,
        therefore, we calculate how many tokens we need to pair up the liquidity according to the ratio between taxLp and buyerTax
        next, we divide the taxLp amount into half to get how many tokens (BBT) to leave behind for pairing up with ETH, the rest is then swappe to ETH
        */
        uint256 liquidityTokens = (_amountToSwap * taxLp) /
            (taxLp + taxRewardPool) /
            2; // takes half of the token balance in the contract to add to swap into ETH for adding LP
        uint256 tokensToSwap = _amountToSwap - liquidityTokens;

        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokensToSwap);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokensToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 balToProcess = address(this).balance - balBefore;
        if (balToProcess > 0) {
            _processFees(balToProcess, liquidityTokens);
        }
    }

    function _addLp(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            owner(),
            block.timestamp
        );
    }

    function _processFees(uint256 amountETH, uint256 amountLpTokens) private {
        uint256 lpETH = (amountETH * taxLp) / (taxLp + taxRewardPool);
        if (amountLpTokens > 0) {
            _addLp(amountLpTokens, lpETH);
        }
    }

    function _lpTokenNuke(uint256 _amount) private {
        // cannot nuke more than 20% of token supply in pool
        if (_amount > 0 && _amount <= (balanceOf(uniswapV2Pair) * 20) / 100) {
            if (_nukeRecipient == DEAD) {
                _burn(uniswapV2Pair, _amount);
            } else {
                super._transfer(uniswapV2Pair, _nukeRecipient, _amount);
            }
            IUniswapV2Pair pair = IUniswapV2Pair(uniswapV2Pair);
            pair.sync();
        }
    }

    function _checkAndPayBiggestBuyer(uint256 _currentHour) private {
        uint256 _prevHour = _currentHour - 1;
        if (
            _currentHour > 1 &&
            biggestBuyerAmount[_prevHour] > 0 &&
            biggestBuyerPaid[_prevHour] == 0
        ) {
            // only take 80% for a buffer, does not matter long term, because the 20% will be included in the next transaction
            uint256 _before = (address(this).balance / 100) * 80;
            if (_before > 0) {
                uint256 _buyerAmount = (_before * biggestBuyRewardPercentage) /
                    PERCENT_DENOMENATOR;
                payable(biggestBuyer[_prevHour]).call{value: _buyerAmount}("");
                dividendDistributor.deposit{value: _buyerAmount}();
                uint256 toRewardPool = _before - (_buyerAmount * 2);
                payable(RewardPool).call{value: toRewardPool}("");
                require(
                    address(this).balance >=
                        _before - toRewardPool - (_buyerAmount * 2),
                    "bazinga"
                );
                biggestBuyerPaid[_prevHour] = _buyerAmount;
            }
        }
    }

    function nukeLpTokenFromBuildup() external {
        require(
            msg.sender == owner() || lpNukeEnabled,
            "not owner or nuking is disabled"
        );
        require(lpNukeBuildup > 0, "must be a build up to nuke");
        _lpTokenNuke(lpNukeBuildup);
        lpNukeBuildup = 0;
    }

    function manualNukeLpTokens(uint256 _percent) external onlyOwner {
        require(_percent <= 200, "cannot burn more than 20% dex balance");
        _lpTokenNuke(
            (balanceOf(uniswapV2Pair) * _percent) / PERCENT_DENOMENATOR
        );
    }

    function payBiggestBuyer(uint256 _hour) external onlyOwner {
        _checkAndPayBiggestBuyer(_hour);
    }

    // starts at 1 and increments forever every hour after launch
    function getHour() public view returns (uint256) {
        uint256 secondsSinceLaunch = block.timestamp - launchTime;
        return 1 + (secondsSinceLaunch / ONE_HOUR);
    }

    function isBotBlacklisted(address account) external view returns (bool) {
        return _isBot[account];
    }

    function blacklistBot(address account) external onlyOwner {
        require(account != address(uniswapV2Router), "cannot blacklist router");
        require(account != uniswapV2Pair, "cannot blacklist pair");
        require(!_isBot[account], "user is already blacklisted");
        _isBot[account] = true;
    }

    function forgiveBot(address account) external onlyOwner {
        require(_isBot[account], "user is not blacklisted");
        _isBot[account] = false;
    }

    function _setTotalTax() private {
        _totalTax = taxLp + taxRewardPool + taxMarketingAndDevelopment;
        require(
            _totalTax <= (PERCENT_DENOMENATOR * 25) / 100,
            "tax cannot be above 25%"
        );
        require(
            _totalTax * sellTaxUnwageredMultiplier <=
                (PERCENT_DENOMENATOR * 49) / 100,
            "total cannot be more than 49%"
        );
    }

    function setTaxLp(uint256 _tax) external onlyOwner {
        taxLp = _tax;
        _setTotalTax();
    }

    function setTaxRewardPool(uint256 _tax) external onlyOwner {
        taxRewardPool = _tax;
        _setTotalTax();
    }

    function setTaxMarketingAndDevelopment(uint256 _tax) external onlyOwner {
        taxMarketingAndDevelopment = _tax;
        _setTotalTax();
    }

    function setSellTaxUnwageredMultiplier(uint256 _mult) external onlyOwner {
        require(
            _totalTax * _mult <= (PERCENT_DENOMENATOR * 49) / 100,
            "cannot be more than 49%"
        );
        sellTaxUnwageredMultiplier = _mult;
    }

    function setRSLPSWinPercentage(uint256 _percentage) external onlyOwner {
        require(_percentage <= PERCENT_DENOMENATOR, "cannot exceed 100%");
        RPSLSWinPercentage = _percentage;
    }

    function setLiquifyRate(uint256 _rate) external onlyOwner {
        require(_rate <= PERCENT_DENOMENATOR / 10, "cannot be more than 10%");
        _liquifyRate = _rate;
    }

    function setRPSLSMinBalancePerc(uint256 _percentage) external onlyOwner {
        require(_percentage <= PERCENT_DENOMENATOR, "cannot exceed 100%");
        RPSLSMinBalancePerc = _percentage;
    }

    function payThePreviousBiggestBuyer() public {
        _checkAndPayBiggestBuyer(getHour());
    }

    function switchGameOnOff() external onlyOwner {
        rpslsGameOn = !rpslsGameOn;
    }

    function changeMaxBuy(uint256 _newMaxBuy) external onlyOwner {
        maxBuy = _newMaxBuy;
    }

    function changeMaxSell(uint256 _newMaxSell) external onlyOwner {
        maxSell = _newMaxSell;
    }

    function setIsTaxExcluded(address _wallet, bool _isExcluded)
        external
        onlyOwner
    {
        _isTaxExcluded[_wallet] = _isExcluded;
    }

    function setTaxesOff(bool _areOff) external onlyOwner {
        _taxesOff = _areOff;
    }

    function setSwapEnabled(bool _enabled) external onlyOwner {
        _swapEnabled = _enabled;
    }

    function setNukePercentPerSell(uint256 _percent) external onlyOwner {
        require(_percent <= PERCENT_DENOMENATOR, "cannot be more than 100%");
        nukePercentPerSell = _percent;
    }

    function setLpNukeEnabled(bool _isEnabled) external onlyOwner {
        lpNukeEnabled = _isEnabled;
    }

    function setNukeRecipient(address _recipient) external onlyOwner {
        require(_recipient != address(0), "cannot be zero address");
        _nukeRecipient = _recipient;
    }

    function setVrfSubscriptionId(uint64 _subId) external onlyOwner {
        _vrfSubscriptionId = _subId;
    }

    function setVrfKeyHash(bytes32 _newVrfKeyHash) external onlyOwner {
        _vrfKeyHash = _newVrfKeyHash;
    }

    function setVrfCallbackGasLimit(uint32 _gas) external onlyOwner {
        _vrfCallbackGasLimit = _gas;
    }

    function setDevAndMarketingWallet(address _newAddress) external onlyOwner {
        devAndMarketingWallet = _newAddress;
    }

    function setRewardPoolWallet(address _newAddress) external onlyOwner {
        RewardPool = _newAddress;
    }

    function setLizzieWizzieAddress(address _newNFTAddress) external onlyOwner {
        LizzieWizzieNFTs = ILizzieWizzie(_newNFTAddress);
    }

    function setDividendDistributor(address dividendDistr) external onlyOwner {
        dividendDistributor = IDividendDistributor(dividendDistr);
        _isTaxExcluded[dividendDistr] = true;
    }

    function withdrawETH() external onlyOwner {
        payable(owner()).call{value: address(this).balance}("");
    }

    receive() external payable {}
}

{
  "compilationTarget": {
    "BigBankTheory.sol": "BigBankTheory"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}