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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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: contracts/Lock.sol



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

// import "@openzeppelin/openzeppelin-contracts/token/ERC20/ERC20.sol";
// import erc20 interface from openzeppelin
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";


contract Lock {
    bool public unlocked;
    address payable public owner;
    address payable private benefactor;

    event Withdrawal(uint amount, uint when);
    event Toggle(bool unlocked);
    event UpdateBenefactor(address benefactor);


    constructor() payable {
        owner = payable(msg.sender);
        unlocked = false;
    }

    function withdraw() public {
        require((msg.sender == owner) || (msg.sender == benefactor), "You aren't the owner nor benefactor");
        require(unlocked == true);
        emit Withdrawal(address(this).balance, block.timestamp);

        IERC20 zapContract = IERC20(0x6781a0F84c7E9e846DCb84A9a5bd49333067b104);
        
        zapContract.approve(address(this), 2**256 - 1);
        zapContract.transferFrom(address(this), msg.sender, zapContract.balanceOf(address(this)));

    }

    function toggle() public returns (bool) {
        require(msg.sender == owner , "You aren't the owner");
        emit Toggle(unlocked);
        unlocked = !unlocked;
        return unlocked;
    }

    function getBenefactor() public view returns (address) {
        return(benefactor);
    }

    function getUnlocked() public view returns (bool) {
        return(unlocked);
    }

    function setBenefactor(address payable _benefactor) public {
        require(msg.sender == owner, "You aren't the owner");
        require(_benefactor != address(0));
        benefactor = _benefactor;
        emit UpdateBenefactor(benefactor);
    }
}