// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// 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: GIGXVESTING20.sol


pragma solidity >=0.8.17;


contract GigxVesting20 {
    address token;
    address owner;
    struct LockDetails {
        uint256 unlockTimestamp;
        uint256 amount;
    }
    mapping(address => LockDetails[]) public vestedTokens;
    mapping(address => uint256) public claimed;

    constructor(address _tokenContractAddress) {
        token = _tokenContractAddress;
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can call this function");
        _;
    }

    function lock(
        address _beneficiary,
        uint256 _amount,
        uint256 _unlockTimestamp
    ) public {
        require(
            vestedTokens[_beneficiary].length < 10,
            "Limit of 10 locks per address to avoid unbounded loop"
        );
        IERC20(token).transferFrom(msg.sender, address(this), _amount);
        vestedTokens[_beneficiary].push(LockDetails(_unlockTimestamp, _amount));
    }

    function unlock(address _beneficiary) public {
        uint256 amountAvailable;
        for (uint256 i = 0; i < vestedTokens[_beneficiary].length; i++) {
            if (
                vestedTokens[_beneficiary][i].unlockTimestamp < block.timestamp
            ) {
                amountAvailable += vestedTokens[_beneficiary][i].amount;
            }
        }
        uint256 claimable = amountAvailable - claimed[_beneficiary];
        require(
            claimable > 0,
            "Nothing to claim. Unlock date has not arrived yet or the claim has already been made"
        );
        claimed[_beneficiary] += claimable;
        IERC20(token).transfer(_beneficiary, claimable);
    }

    function getOwner() public view returns (address) {
        return owner;
    }

    function getTime() external view returns (uint256) {
        return block.timestamp;
    }
}