// File: @openzeppelin/contracts/access/Ownable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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

// File: contracts/CampaignGoFuckYourself.sol



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

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract CampaignGoFuckYourself is Ownable {
    // ========================================
    //     EVENT & ERROR DEFINITIONS
    // ========================================

    error TransferFailed();
    error InvalidSignature();
    error NoPermissionToExecute();
    error NotEnoughCollateral();
    error NotEnoughSupplyToBorrow();
    error ExpiredPrice();
    error ExpiredTime();
    error ContractsNotAllowed();

    // ========================================
    //     VARIABLE DEFINITIONS
    // ========================================

    struct SignatureContent {
        uint256 nonce;
        uint256 amount;
        uint256 price;
        uint40 timestamp;
        address token;
    }

    address public SIGNER;
    bytes32 internal constant SIG_TYPEHASH =
        keccak256(
            "SignatureContent(uint256 nonce,uint256 amount,uint256 price,uint40 timestamp,address token)"
        );
    mapping(address => address) public supportedTokens;
    mapping(bytes32 => bool) public revokedSignatures;

    // ========================================
    //    CONSTRUCTOR AND CORE FUNCTIONS
    // ========================================

    constructor(
        address _token,
        address _tokenOwner,
        address _signer
    ) {
        supportedTokens[_token] = _tokenOwner;
        SIGNER = _signer;
    }

    function burnToken(
        SignatureContent calldata _content,
        bytes calldata _signature
    ) external payable {
        require(supportedTokens[_content.token] != address(0), "Invalid Token");
        require(
            IERC20(_content.token).balanceOf(address(this)) >=
                _content.amount &&
                _content.amount > 0,
            "Not enough balance"
        );
        signatureCheck(_content, _signature);
        require(msg.value >= _content.price, "Invalid Amount");

        IERC20(_content.token).transfer(
            0x000000000000000000000000000000000000dEaD,
            _content.amount
        );
    }

    // ========================================
    //     SIGNATURE FUNCTIONS
    // ========================================

    function revokeSignature(bytes32 _hash) internal {
        if (revokedSignatures[_hash] == true) revert InvalidSignature();
        revokedSignatures[_hash] = true;
    }

    function _eip712DomainSeparator() private view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256(
                        "EIP712Domain(string name,string version,address verifyingContract)"
                    ),
                    keccak256(bytes("CampaignGoFuckYourself")),
                    keccak256(bytes("1.0")),
                    address(this)
                )
            );
    }

    function getMessageHash(SignatureContent memory _content)
        public
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    SIG_TYPEHASH,
                    _content.nonce,
                    _content.amount,
                    _content.price,
                    _content.timestamp,
                    _content.token
                )
            );
    }

    function getEthSignedMessageHash(SignatureContent calldata _content)
        public
        view
        returns (bytes32)
    {
        return
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    _eip712DomainSeparator(),
                    getMessageHash(_content)
                )
            );
    }

    function validateSignature(uint40 _expiration, bytes32 _hash) public view {
        if (block.timestamp >= _expiration) revert ExpiredTime();
        if (revokedSignatures[_hash] != false) revert InvalidSignature();
    }

    function signatureCheck(
        SignatureContent calldata _content,
        bytes memory signature
    ) public view returns (bool) {
        bytes32 ethSignedMessageHash = getEthSignedMessageHash(_content);
        validateSignature(_content.timestamp, ethSignedMessageHash);
        return recoverSigner(ethSignedMessageHash, signature) == SIGNER;
    }

    function recoverSigner(
        bytes32 _ethSignedMessageHash,
        bytes memory _signature
    ) public pure returns (address) {
        (bytes32 r, bytes32 s, uint8 v) = splitSignature(_signature);

        return ecrecover(_ethSignedMessageHash, v, r, s);
    }

    function splitSignature(bytes memory sig)
        public
        pure
        returns (
            bytes32 r,
            bytes32 s,
            uint8 v
        )
    {
        require(sig.length == 65, "invalid signature length");

        assembly {
            r := mload(add(sig, 32))
            // second 32 bytes
            s := mload(add(sig, 64))
            // final byte (first byte of the next 32 bytes)
            v := byte(0, mload(add(sig, 96)))
        }
    }

    // ========================================
    //     ADMIN FUNCTIONS
    // ========================================

    function addOrRemoveToken(address _token, address _tokenOwner)
        public
        onlyOwner
    {
        supportedTokens[_token] = _tokenOwner;
    }

    function withdrawETH() external onlyOwner {
        bool success;
        (success, ) = address(msg.sender).call{value: address(this).balance}(
            ""
        );
    }

    function withdrawTokens(address _token) external {
        require(_token != address(this), "Cannot withdraw this token");
        require(supportedTokens[_token] == msg.sender, "Not Token Owner");
        require(IERC20(_token).balanceOf(address(this)) > 0, "No tokens");
        uint256 amount = IERC20(_token).balanceOf(address(this));
        IERC20(_token).transfer(msg.sender, amount);
    }

    function setSigner(address _signer) external onlyOwner {
        SIGNER = _signer;
    }
}