// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

//Address (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol)

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// Context (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol) 
/**
 * @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;
    }
}

// Ownable (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol)

/**
 * @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);
    }
}



// ReentrancyGuard (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/security/ReentrancyGuard.sol)
/**
 * @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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
								//
// IERC20 (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol)
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// SafeERC20 (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/utils/SafeERC20.sol)
/**
 * @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));
        }
    }

    /**
     * @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");
        }
    }
}


// IMyobu 
interface IMyobu is IERC20 {
    event DAOChanged(address newDAOContract);
    event MyobuSwapChanged(address newMyobuSwap);

    function DAO() external view returns (address); // solhint-disable-line

    function myobuSwap() external view returns (address);

    event TaxAddressChanged(address newTaxAddress);
    event TaxedTransferAddedFor(address[] addresses);
    event TaxedTransferRemovedFor(address[] addresses);

    event FeesTaken(uint256 teamFee);
    event FeesChanged(Fees newFees);

    struct Fees {
        uint256 impact;
        uint256 buyFee;
        uint256 sellFee;
        uint256 transferFee;
    }

    function currentFees() external view returns (Fees memory);

    struct LiquidityETHParams {
        address pair;
        address to;
        uint256 amountTokenOrLP;
        uint256 amountTokenMin;
        uint256 amountETHMin;
        uint256 deadline;
    }

    event LiquidityAddedETH(
        address pair,
        uint256 amountToken,
        uint256 amountETH,
        uint256 liquidity
    );

    function noFeeAddLiquidityETH(LiquidityETHParams calldata params)
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );


    function taxedPair(address pair) external view returns (bool);
} 
interface IRewardToken is IERC20 {

function mint(uint256 amount) external returns(bool);

}
// IERC165(https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/introspection/IERC165.sol)

/**
 * @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);
}

// IERC721(https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/IERC721.sol)
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`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
      * @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;

}
// IERC721Receiver(https://github.com/binodnp/openzeppelin-solidity/blob/master/contracts/token/ERC721/IERC721Receiver.sol)

/**
 * @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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

// ERC721Holder (https://github.com/binodnp/openzeppelin-solidity/blob/master/contracts/token/ERC721/ERC721Holder.sol)

  /**
   * @dev Implementation of the {IERC721Receiver} interface.
   *
   * Accepts all token transfers.
   * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
   */
  
contract ERC721Holder is IERC721Receiver {

    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

interface INFT is IERC721 {
	function getMultiplierForTokenID(uint256 _tokenID) external view returns (uint256);
}
// IUniswapV2Router01 (https://github.com/Uniswap/v2-periphery/blob/master/contracts/UniswapV2Router01.sol)
interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// IUniswapV2Router02 (https://github.com/Uniswap/v2-periphery/blob/master/contracts/UniswapV2Router02.sol)
interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// Staking contract (this is forked, rewritten for 0.8.x, gas optimized and functionally modified from GooseDefi's MasterchefV2, codebase is battle tested countless times and is totally safe).
// You're free to publish, distribute and modify a copy of this contract as you want. Please mention where it's from though. 
// Have fun reading it :) ( Original contract : https://github.com/goosedefi/goose-contracts/blob/master/contracts/MasterChefV2.sol). 
// RWT is a placeholder name for the upcoming reward token
contract MyobuChef is Ownable, ReentrancyGuard, ERC721Holder {
    using SafeERC20 for IERC20;
	
    // Info of each user.
    struct UserInfo {
        uint16 boostPointsBP;	    // The NFT multiplier. 
        uint16 lockTimeBoost;          // the lock time boost, max is x3
        uint32 lockedUntil;         // lock end in UNIX seconds, used to compute the lockTimeBoost
        uint96 claimableRWT;
		uint96 claimableETH;
        uint112 amount;             // How many LP tokens the user has provided.
        uint112 weightedBalance;    // amount * boostPointsBP * lockTimeBoost
        uint112 rewardDebt;		    // Reward debt. See explanation below.
		uint112 ETHrewardDebt;
        address[] NFTContracts;         // Trackers for NFT tokens staked 
        uint[] NFTTokenIDs;              
        //
        // We do some fancy math here. Basically, any point in time, the amount of RWTs and ETH 
        // entitled to a user but is pending to be distributed is:
		//  weightedBalance = (user.amount * (1000+boostPointsBP * 1000+lockTimeBoost)) / 1000000
        //   pending RWT reward = ((user.weightedBalance * pool.accRwtPerShare) - user.rewardDebt)
        //	 pending ETH rewards = 	(user.amount * pool.accETHPerShare) - user.ETHrewardDebt		
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accEggPerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }
    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken;             // Address of LP token contract.
        uint64 allocPoint;          // How many allocation points assigned to this pool. EGGs to distribute per block.
        uint64 lastRewardBlock;     // Last block number that rewards distribution occurs.
        uint112 accRwtPerShare;     // Accumulated RWTs per share, times 1e12.
        uint112 accETHPerShare;     // Accumulated ETH rewards  per share, times 1e12. 
		uint112 weightedBalance;    // The total of all weightedBalances from users. 
    }

  
    // The Myobu token
    IMyobu public Myobu;
	// The reward token 
	IRewardToken public rwt;
	// The uniswap V2 router
	address public router;
	// The WETH token contract
	address public WETH;
	// The ETHBank address
	address public ETHBank;
	// The boost nft contracts 
	mapping (address => bool) public isNFTContract;
    // RWT tokens created per block.
    uint256 public rwtPerBlock;
    // ETH distributed per block 
	uint256 public ETHPerBlock;
	// ETH not distributed yet (should be address(this).balance - ETHLeftUnclaimed)
	uint256 public ETHLeftUnshared;
	// ETH distributed  but not claimed yet 
	uint256 public ETHLeftUnclaimed;
    // Days 
    uint256 public numdays;
    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint;
    // The block number when the farm starts mining starts.
    uint256 public startBlock;
	// Has the secondary reward token been released yet? 
	bool public tokenReleased;
	bool public isEmergency;
	event RewardTokenSet(address indexed tokenAddress, uint256 indexed rwtPerBlock, uint256 timestamp);
    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event UpdateEmissionRate(address indexed user, uint256 rwtPerBlock);
	event NFTStaked(address indexed user, address indexed NFTContract, uint256 tokenID);
	event NFTWithdrawn(address indexed user, address indexed NFTContract, uint256 tokenID);
	event TokensLocked(address indexed user, uint256 timestamp, uint256 lockTime);
	event Emergency(uint256 timestamp, bool ifEmergency);
    mapping(IERC20 => bool) public poolExistence;
    modifier nonDuplicated(IERC20 _lpToken) {
        require(poolExistence[_lpToken] == false, "nonDuplicated: duplicated");
        _;
    }
    
    modifier onlyEmergency {
        require(isEmergency == true, "onlyEmergency: Emergency use only!");
        _;
    }
    mapping(address => bool) public authorized;
    modifier onlyAuthorized {
        require(authorized[msg.sender] == true, "onlyAuthorized: address not authorized");
        _;
    }
    constructor(
        IMyobu _myo,
		address _router
    ) {
        Myobu = _myo;
        router = _router;
		WETH = IUniswapV2Router02(router).WETH();
		startBlock = type(uint256).max;
        numdays = 1;
    }

//--------------------------------------------------------VIEW FUNCTIONS --------------------------------------------------------
    // Return number of pools
	function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }
    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to) public pure returns (uint256) {
        return (_to - _from);
    }

    // View function to see pending rewards (RWT and ETH) on frontend.
    function pendingRewards(uint256 _pid, address _user) external view returns (uint256, uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 userWeightedAmount = user.weightedBalance;
        uint256 accRwtPerShare = pool.accRwtPerShare;
        uint256 accETHPerShare = pool.accETHPerShare;
        uint256 weightedBalance = pool.weightedBalance;
        uint256 PendingRWT;
        uint256 PendingETH;
        if (block.number > pool.lastRewardBlock && weightedBalance != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
            uint256 rwtReward = multiplier * rwtPerBlock * pool.allocPoint / totalAllocPoint;
            accRwtPerShare = accRwtPerShare + rwtReward * 1e12 / weightedBalance;
            uint256 ETHReward = multiplier * ETHPerBlock * pool.allocPoint / totalAllocPoint;
            accETHPerShare = accETHPerShare + ETHReward * 1e12 / weightedBalance;
            PendingRWT = (userWeightedAmount * accRwtPerShare / 1e12) - user.rewardDebt + user.claimableRWT;
            PendingETH = (userWeightedAmount * accETHPerShare / 1e12) - user.ETHrewardDebt + user.claimableETH;
        }
        return(PendingRWT, PendingETH);
    }


//--------------------------------------------------------PUBLIC FUNCTIONS --------------------------------------------------------
    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }
    
	//Receive ETH from the tax splitter contract. triggered on a walue transfer with .call("arbitraryData").
    fallback() external payable {
        ETHLeftUnshared += msg.value;
        updateETHRewards();
    }
	//Receive ETH sent through .send, .transfer, or .call(""). These wont be taken into account in the rewards. 
    receive() external payable {
        require(msg.sender != ETHBank);
    }
    
    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = pool.weightedBalance;
        if (lpSupply == 0 || pool.allocPoint == 0) {
            pool.lastRewardBlock = uint64(block.number);
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        if(tokenReleased) {
            uint256 rwtReward = multiplier * rwtPerBlock * pool.allocPoint / totalAllocPoint;
            pool.accRwtPerShare = uint112(pool.accRwtPerShare + rwtReward * 1e12 / lpSupply);
        }
        uint256 ETHReward = multiplier * ETHPerBlock * pool.allocPoint / totalAllocPoint;
        ETHLeftUnclaimed = ETHLeftUnclaimed + ETHReward;
        ETHLeftUnshared = ETHLeftUnshared - ETHReward;
        pool.accETHPerShare = uint112(pool.accETHPerShare + ETHReward * 1e12 / lpSupply);
        pool.lastRewardBlock = uint64(block.number);
    }

    // Deposit tokens for rewards.
    function deposit(uint256 _pid, uint256 _amount, uint256 lockTime) public nonReentrant {
        _deposit(msg.sender, _pid, _amount, lockTime);
    }
    // Withdraw unlocked tokens.
    function withdraw(uint32 _pid, uint256 _amount) public nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.lockedUntil < block.timestamp, "withdraw: Tokens locked, if you're trying to claim your rewards use the deposit function");
        require(user.amount >= _amount && _amount > 0, "withdraw: not good");
        updatePool(_pid);
        if (user.weightedBalance > 0){
            _addToClaimable(_pid, msg.sender);
            if(tokenReleased) {
                if (user.claimableRWT > 0) {
                    safeRWTTransfer(msg.sender, user.claimableRWT);
                    user.claimableRWT = 0;
                }
            }
            if (user.claimableETH > 0) { 
                safeETHTransfer(msg.sender, user.claimableETH);
                user.claimableETH = 0;
            }
        }
        user.amount = uint112(user.amount - _amount);
        pool.lpToken.safeTransfer(address(msg.sender), _amount);
        updateUserWeightedBalance(_pid, msg.sender);

        emit Withdraw(msg.sender, _pid, _amount);
    }
    
    // Withdraw unlocked tokens without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) public nonReentrant onlyEmergency {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        uint256 amount = user.amount;
        pool.weightedBalance -= user.weightedBalance;
        user.amount = 0;
        user.weightedBalance = 0;
        user.ETHrewardDebt = 0;
        user.rewardDebt = 0;
        user.claimableETH = 0;
        user.claimableRWT = 0;
        pool.lpToken.safeTransfer(address(msg.sender), amount);
        emit EmergencyWithdraw(msg.sender, _pid, amount);
    }
	
	
	//Adds Myobu/ETH liquidity without transfer fees and stakes the amount. Refund any unspent ETH to the user.
    
	//@dev The Myobu/ETH pool MUST be pool 0
    function addLiquidityNoFeeAndStake(uint256 amountTokensIn, uint256 amountETHMin, uint256 amountTokenMin, uint256 lockTime) public payable nonReentrant {
        IMyobu.LiquidityETHParams memory params;
        UserInfo storage user = userInfo[0][msg.sender];
        require(msg.value > 0);
        require((lockTime >= 604800 && lockTime <= 31449600 && user.lockedUntil <= lockTime + block.timestamp) || (lockTime == 0 && user.lockedUntil >= block.timestamp), "addLiquidityNoFeeAndStake : Can't lock tokens for less than 1 week");
        updatePool(0);
        if (user.weightedBalance > 0) {
            _addToClaimable(0, msg.sender);
        }
        Myobu.transferFrom(msg.sender, address(this), amountTokensIn);
        params.pair = address(poolInfo[0].lpToken);
        params.to = address(this);
        params.amountTokenMin = amountTokenMin;
        params.amountETHMin = amountETHMin;
        params.amountTokenOrLP = amountTokensIn;
        params.deadline = block.timestamp;
        (,uint256 ETHUsed ,uint256 numLiquidityAdded) = Myobu.noFeeAddLiquidityETH{value: msg.value}(params);
        //noFeeAddLiquidityETH refunds unused ETH, but not Myobu, we're forced to do the same here (any unused Myobu is locked in the token contract and will be treated as transfer fees).
        // @dev no access to address(this).balance, saves about 1,3k gas.
        payable(msg.sender).transfer(msg.value - ETHUsed);
        user.amount += uint112(numLiquidityAdded);
        if (lockTime > 0) {
            lockTokens(msg.sender, 0, lockTime);
        }
        else {
            updateUserWeightedBalance(0, msg.sender);
        }
		emit Deposit(msg.sender, 0, numLiquidityAdded);
    }
    
	//Buy Myobu with the ETH rewards from the Myobu single asset pool to compound
	// @dev Myobu single asset pool MUST be pool 1
    function reinvestETHRewards(uint256 amountOutMin) public nonReentrant {
            UserInfo storage user = userInfo[1][msg.sender];
            require(user.lockedUntil >= block.timestamp);
            updatePool(1);
            uint256 ETHPending = (user.weightedBalance * poolInfo[1].accETHPerShare / 1e12) - user.ETHrewardDebt + user.claimableETH;
            require(ETHPending > 0);
            address[] memory path = new address[](2);
            path[0] = WETH;
            path[1] = address(Myobu);
            if(ETHPending > ETHLeftUnclaimed) {
                ETHPending = ETHLeftUnclaimed;
            }
            uint256 balanceBefore = Myobu.balanceOf(address(this));
            IUniswapV2Router02(router).swapExactETHForTokensSupportingFeeOnTransferTokens{value: ETHPending}(
            amountOutMin,
            path,
            address(this),
            block.timestamp
            );
            uint256 amountSwapped = Myobu.balanceOf(address(this)) - balanceBefore;
            user.amount += uint112(amountSwapped);
            user.claimableETH = 0;
            updateUserWeightedBalance(1, msg.sender);
            emit Deposit(msg.sender, 1, amountSwapped);
    }
    
    function buyAndStakeETH(uint256 amountOutMin, uint256 lockTime) public payable nonReentrant{
        UserInfo storage user = userInfo[1][msg.sender];
        require(msg.value > 0);
        require((lockTime >= 604800 && lockTime <= 31449600 && user.lockedUntil <= lockTime + block.timestamp) || (lockTime == 0 && user.lockedUntil >= block.timestamp), "buyAndStakeETH : Can't lock tokens for less than 1 week");
        updatePool(1);
        if (user.weightedBalance > 0) {
            _addToClaimable(1, msg.sender);
        }
        uint256 balanceBefore = Myobu.balanceOf(address(this));
        address[] memory path = new address[](2);
        path[0] = WETH;
        path[1] = address(Myobu);
        IUniswapV2Router02(router).swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(
            amountOutMin,
            path,
            address(this),
            block.timestamp
        );
        uint256 _amount = Myobu.balanceOf(address(this)) - balanceBefore;
        user.amount = uint112(user.amount + _amount);
        if (lockTime > 0){
            lockTokens(msg.sender, 1, lockTime);
        }
        else {
            updateUserWeightedBalance(1, msg.sender);
        }
        emit Deposit(msg.sender, 1, _amount);
    }

    // Withdraw previously staked NFT, loosing the rewards boost
	function withdrawNFT(uint256 _pid, address NFTContract, uint tokenID) public nonReentrant {
        address sender = msg.sender;
		uint256 NFTIndex;
        bool tokenFound;
        uint length = userInfo[_pid][sender].NFTContracts.length;
        updatePool(_pid);
        _addToClaimable(_pid, sender);
        for (uint i; i < userInfo[_pid][sender].NFTContracts.length; i++) {
            if (userInfo[_pid][sender].NFTContracts[i] == NFTContract) {
                if(userInfo[_pid][sender].NFTTokenIDs[i] == tokenID) {
                tokenFound = true;
                NFTIndex = i;
				break;
				}
            }
		}
        require(tokenFound == true, "withdrawNFT, token not found");
		userInfo[_pid][sender].boostPointsBP -= uint16(INFT(NFTContract).getMultiplierForTokenID(tokenID));
		userInfo[_pid][sender].NFTContracts[NFTIndex] = userInfo[_pid][sender].NFTContracts[length -1];
		userInfo[_pid][sender].NFTContracts.pop();
		userInfo[_pid][sender].NFTTokenIDs[NFTIndex] = userInfo[_pid][sender].NFTTokenIDs[length -1];
		userInfo[_pid][sender].NFTTokenIDs.pop();
		updateUserWeightedBalance(_pid, sender);
		INFT(NFTContract).safeTransferFrom(address(this), sender, tokenID);
			emit NFTWithdrawn(sender, NFTContract, tokenID);
    }

	// Stake an NFT for rewards boost. Cannot be called by other contracts, see below.
    function boostWithNFT(uint256 _pid, address NFTContract, uint tokenID) public nonReentrant {
        // We allow vaults to interact with our contracts, but we believe that they shouldnt be allowed to stake NFTs to have all their users enjoy boosted rewards as a group.
        // In an effort to prevent this we dont allow other contracts to interact with this function. 
        // All other functions public functions are accessible and devs are more than welcomed to build on top of our contracts.
        require(msg.sender == tx.origin, "boostWithNFT : no contracts"); 
        require(isNFTContract[NFTContract], "boostWithNFT: incorrect contract address");
        require(userInfo[_pid][msg.sender].lockedUntil >= block.timestamp);
        updatePool(_pid);
        _addToClaimable(_pid, msg.sender);
        INFT(NFTContract).safeTransferFrom(msg.sender, address(this), tokenID);
        userInfo[_pid][msg.sender].NFTContracts.push(NFTContract);
		userInfo[_pid][msg.sender].NFTTokenIDs.push(tokenID);
        userInfo[_pid][msg.sender].boostPointsBP += uint16(INFT(NFTContract).getMultiplierForTokenID(tokenID));
        updateUserWeightedBalance(_pid, msg.sender);
		emit NFTWithdrawn(msg.sender, NFTContract, tokenID);
    }
    
    function addToClaimable(uint256 _pid, address sender) public nonReentrant {
        require(userInfo[_pid][sender].lockedUntil >= block.timestamp);
        updatePool(_pid);
        _addToClaimable(_pid, sender);
    }

//--------------------------------------------------------RESTRICTED FUNCTIONS --------------------------------------------------------	

    function depositFor(address sender, uint256 _pid, uint256 amount, uint256 lockTime) public onlyAuthorized {
        _deposit(sender, _pid, amount, lockTime);
    }
    // Create a new pool. Can only be called by the owner.
    function add(uint64 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner nonDuplicated(_lpToken) {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint64 lastRewardBlock = uint64(block.number > startBlock ? block.number : startBlock);
        totalAllocPoint = totalAllocPoint + _allocPoint;
        poolExistence[_lpToken] = true;
        poolInfo.push(PoolInfo({
        lpToken : _lpToken,
        allocPoint : _allocPoint,
        lastRewardBlock : lastRewardBlock,
        accRwtPerShare : 0,
        accETHPerShare : 0,
        weightedBalance : 0
        }));
    }
	// Add an NFT Contract to the list. 
	function addNFTContract(address NFTcontract) public onlyOwner {
		isNFTContract[NFTcontract] = true;
	}
	
	// Set ETHBank
	function setETHBank(address _ETHBank) public onlyOwner {
	    ETHBank = _ETHBank;
	}

    // Set Router
    function setRouter(address _router) public onlyOwner {
        router = _router;
    }
	
	// Pull out tokens accidentally sent to the contract. Doesnt work with the reward token or any staked token. Can only be called by the owner.
    function rescueToken(address tokenAddress) public onlyOwner {
        require((tokenAddress != address(rwt)) && !poolExistence[IERC20(tokenAddress)], "rescueToken : wrong token address");
        uint256 bal = IERC20(tokenAddress).balanceOf(address(this));
        IERC20(tokenAddress).transfer(msg.sender, bal);
    }

    // Update the given pool's rewards allocation point and deposit fee. Can only be called by the owner.
    function set(uint256 _pid, uint64 _allocPoint, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        totalAllocPoint = totalAllocPoint - poolInfo[_pid].allocPoint + _allocPoint ;
        poolInfo[_pid].allocPoint = _allocPoint;
    }
	// Initialize the ETH rewards. Can only be called by the owner. 
    function startRewards() public onlyOwner {
        require(startBlock > block.number, "startRewards: rewards already started");
        startBlock = block.number;
        for (uint i; i < poolInfo.length; i++) {
            poolInfo[i].lastRewardBlock = uint64(block.number);            
        }
    }
    // Updates RWT emision rate. Can only be called by the owner
    function updateEmissionRate(uint256 _rwtPerBlock) public onlyOwner {
        require(tokenReleased == true, "updateEmissionRate: Reward token not set");
		massUpdatePools();
        rwtPerBlock = _rwtPerBlock;
        emit UpdateEmissionRate(msg.sender, _rwtPerBlock);
    }
    // Sets the reward token address and the initial emission rate. Can only be called by the owner. 
    function setRewardToken(address _RWT, uint _rwtPerBlock) public onlyOwner {
        require(tokenReleased == false, "Reward token already set");
        rwt = IRewardToken(_RWT);
        rwtPerBlock = _rwtPerBlock;
		tokenReleased = true;
        emit RewardTokenSet(_RWT, _rwtPerBlock, block.timestamp);
    }
    
    // Emergency only 
    function emergency(bool _isEmergency) public onlyOwner {
        isEmergency = _isEmergency;
        emit Emergency(block.timestamp, _isEmergency);
    }
    function authorize(address _address) public onlyOwner {
        authorized[_address] = true;
    }
    function unauthorize(address _address) public onlyOwner {
        authorized[_address] = false;
    }
    function setnumdays(uint256 _days) public onlyOwner {
        require(_days > 0 && _days < 14);
        numdays = _days;
    }
    

//--------------------------------------------------------INTERNAL FUNCTIONS --------------------------------------------------------
    function _deposit(address sender, uint256 _pid, uint256 _amount, uint256 lockTime) internal {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][sender];
        updatePool(_pid);
        if (user.weightedBalance > 0) {
            if (_amount == 0 && lockTime == 0) {
                if(tokenReleased) {
                    uint256 pending = (user.weightedBalance * pool.accRwtPerShare / 1e12) - user.rewardDebt + user.claimableRWT;
                    if (pending > 0) {
                        safeRWTTransfer(sender, pending);
                    }
                    user.rewardDebt = user.weightedBalance * pool.accRwtPerShare / 1e12;
                }
                uint256 ETHPending = (user.weightedBalance * pool.accETHPerShare / 1e12) - user.ETHrewardDebt + user.claimableETH;
                if (ETHPending > 0) { 
                    safeETHTransfer(sender, ETHPending);
                    user.ETHrewardDebt = user.weightedBalance * pool.accETHPerShare / 1e12;

                }
                user.claimableRWT = 0;
                user.claimableETH = 0;
            }
            else {
                _addToClaimable(_pid, sender);
            }
        }
        if (_amount > 0) {
            require((lockTime >= 604800 && lockTime <= 31449600 && user.lockedUntil <= lockTime + block.timestamp) || (lockTime == 0 && user.lockedUntil >= block.timestamp), "deposit : Can't lock tokens for less than 1 week");
            //Still takes the tokens from msg.sender (intended)
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = uint112(user.amount + _amount);
            if (lockTime == 0) {
                updateUserWeightedBalance(_pid, sender);
            }
        }
		if (lockTime > 0) {
		    lockTokens(sender, _pid, lockTime);
		}
		if (user.lockedUntil < block.timestamp) {
		    updateUserWeightedBalance(_pid, sender);
		}
        emit Deposit(sender, _pid, _amount);
    }
    
    //Lock tokens up to 52 weeks for rewards boost, ( max rewards = x3, rewards increase linearly with lock time)
    function lockTokens(address sender, uint256 _pid, uint256 lockTime) internal {
        UserInfo storage user = userInfo[_pid][sender]; 
        require(user.amount > 0, "lockTokens: No tokens to lock"); 
        require(user.lockedUntil <= block.timestamp + lockTime, "lockTokens: Tokens already locked");
        require(lockTime >= 604800, "lockTokens: Lock time too short");
        require(lockTime <= 31449600, "lockTokens: Lock time too long");
        user.lockedUntil = uint32(block.timestamp + lockTime);
        user.lockTimeBoost = uint16(2 * 1000 * (lockTime-604800) / 30844800); // 0 - 2000 
        updateUserWeightedBalance(_pid, sender);
		emit TokensLocked(sender, block.timestamp, lockTime);
    }
    
    // calculate and update the user weighted balance
	function updateUserWeightedBalance(uint256 _pid, address _user) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
		uint256 poolBalance = pool.weightedBalance - user.weightedBalance;
		if (user.lockedUntil < block.timestamp) {
		    user.weightedBalance = 0;
		    user.lockTimeBoost = 0;
		}
		else {
            user.weightedBalance = user.amount * (1000 + user.lockTimeBoost) * (1000 + user.boostPointsBP) / 1000000;
        }
        pool.weightedBalance = uint112(poolBalance + user.weightedBalance);
		user.rewardDebt = user.weightedBalance * pool.accRwtPerShare / 1e12;
		user.ETHrewardDebt = user.weightedBalance * pool.accETHPerShare / 1e12;
    }
    
    // triggered on refills. 
    function updateETHRewards() internal {
        // ETHPerBlock = ETHLeftUnshared / nb of blocks in numdays days. 
        // The contact assumes it's not going to receive any ether for another numdays days and computes the rewards for this period accordingly.
        // Refilling early isnt an issue, any unshared ETH left will make it into the next rewards cycle
        ETHPerBlock = ETHLeftUnshared / (6400 * numdays);
        massUpdatePools();
    }
    
    function _addToClaimable(uint256 _pid, address sender) internal {
        UserInfo storage user = userInfo[_pid][sender];
        PoolInfo storage pool = poolInfo[_pid];
        if(tokenReleased) {
                uint256 pending = (user.weightedBalance * pool.accRwtPerShare / 1e12) - user.rewardDebt;
                if (pending > 0) {
                    user.claimableRWT += uint96(pending);
                    user.rewardDebt = user.weightedBalance * pool.accRwtPerShare / 1e12;
                }
            }
            uint256 ETHPending = (user.weightedBalance * pool.accETHPerShare / 1e12) - user.ETHrewardDebt;
            if (ETHPending > 0) { 
                user.claimableETH += uint96(ETHPending);
                user.ETHrewardDebt = user.weightedBalance * pool.accETHPerShare / 1e12;
            }
    }

    // Safe transfer function, just in case if rounding error causes pool to not have enough RWTs.
    function safeRWTTransfer(address _to, uint256 _amount) internal {
        uint256 rwtBal = rwt.balanceOf(address(this));
        bool transferSuccess = false;
        if (_amount > rwtBal) {
            transferSuccess = rwt.transfer(_to, rwtBal);
        } else {
            transferSuccess = rwt.transfer(_to, _amount);
        }
        require(transferSuccess, "safeRWTTransfer: transfer failed");
    }
    // Same as the previous function,
	// deleted check, will fail only on being sent to a contract with a fallback function not empty/without a fallback/recieve function, and will revert in this case (If balance is not enough will simply transfer 0 ETH)
    function safeETHTransfer(address _to, uint256 _amount) internal {
        if (_amount > ETHLeftUnclaimed) {
            _amount = ETHLeftUnclaimed;
        }
            payable(_to).transfer(_amount);
            ETHLeftUnclaimed-= _amount;
    }
}

{
  "compilationTarget": {
    "MyobuChef.sol": "MyobuChef"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "remappings": []
}