contract Timelock {
    using SafeMath for uint256;

    /// @notice An event emitted when the timelock admin changes
    event NewAdmin(address indexed newAdmin);
    /// @notice An event emitted when a new admin is staged in the timelock
    event NewPendingAdmin(address indexed newPendingAdmin);
    event NewDelay(uint indexed newDelay);
    /// @notice An event emitted when a queued transaction is cancelled
    event CancelTransaction(bytes32 indexed txHash, address indexed target, uint256 value, string signature,  bytes data, uint256 eta);
    /// @notice An event emitted when a queued transaction is executed
    event ExecuteTransaction(bytes32 indexed txHash, address indexed target, uint256 value, string signature,  bytes data, uint256 eta);
    /// @notice An event emitted when a new transaction is queued
    event QueueTransaction(bytes32 indexed txHash, address indexed target, uint256 value, string signature, bytes data, uint256 eta);

    /// @notice the length of time after the delay has passed that a transaction can be executed
    uint256 public constant GRACE_PERIOD = 14 days;
    /// @notice the minimum length of the timelock delay
    uint256 public constant MINIMUM_DELAY = 2 days; // have to be present for 2 rebases
    /// @notice the maximum length of the timelock delay
    uint256 public constant MAXIMUM_DELAY = 30 days;

    address public admin;
    address public pendingAdmin;
    uint256 public delay;
    bool public admin_initialized;

    mapping (bytes32 => bool) public queuedTransactions;


    constructor()
        public
    {
        /* require(delay_ >= MINIMUM_DELAY, "Timelock::constructor: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay."); */

        admin = msg.sender;
        delay = MINIMUM_DELAY;
        admin_initialized = false;
    }

    function() external payable { }


    /**
    @notice sets the delay
    @param delay_ the new delay
     */
    function setDelay(uint256 delay_)
        public
    {
        require(msg.sender == address(this), "Timelock::setDelay: Call must come from Timelock.");
        require(delay_ >= MINIMUM_DELAY, "Timelock::setDelay: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay.");
        delay = delay_;

        emit NewDelay(delay);
    }


    /// @notice sets the new admin address
    function acceptAdmin()
        public
    {
        require(msg.sender == pendingAdmin, "Timelock::acceptAdmin: Call must come from pendingAdmin.");
        admin = msg.sender;
        pendingAdmin = address(0);
        admin_initialized = true;
        emit NewAdmin(admin);
    }

    /**
    @notice queues a new pendingAdmin
    @param pendingAdmin_ the new pendingAdmin address
     */
    function setPendingAdmin(address pendingAdmin_)
        public
    {
        if (admin_initialized) {
          require(msg.sender == address(this), "Timelock::setPendingAdmin: Call must come from Timelock.");
        }
        pendingAdmin = pendingAdmin_;

        emit NewPendingAdmin(pendingAdmin);
    }


    function queueTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    )
        public
        returns (bytes32)
    {
        require(msg.sender == admin, "Timelock::queueTransaction: Call must come from admin.");
        //require(eta >= getBlockTimestamp().add(delay), "Timelock::queueTransaction: Estimated execution block must satisfy delay.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        queuedTransactions[txHash] = true;

        emit QueueTransaction(txHash, target, value, signature, data, eta);
        return txHash;
    }

    function cancelTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    )
        public
    {
        require(msg.sender == admin, "Timelock::cancelTransaction: Call must come from admin.");

        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        queuedTransactions[txHash] = false;

        emit CancelTransaction(txHash, target, value, signature, data, eta);
    }

    function executeTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    )
        public
        payable
        returns (bytes memory)
    {
        require(msg.sender == admin, "Timelock::executeTransaction: Call must come from admin.");

        // timelock not enforced prior to updating the admin. This should occur on
        // deployment.
        bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
        if (admin_initialized) {
          require(queuedTransactions[txHash], "Timelock::executeTransaction: Transaction hasn't been queued.");
          require(getBlockTimestamp() >= eta, "Timelock::executeTransaction: Transaction hasn't surpassed time lock.");
          require(getBlockTimestamp() <= eta.add(GRACE_PERIOD), "Timelock::executeTransaction: Transaction is stale.");

          queuedTransactions[txHash] = false;
        }


        bytes memory callData;

        if (bytes(signature).length == 0) {
            callData = data;
        } else {
            callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);
        }

        // solium-disable-next-line security/no-call-value
        (bool success, bytes memory returnData) = target.call.value(value)(callData);
        require(success, "Timelock::executeTransaction: Transaction execution reverted.");

        emit ExecuteTransaction(txHash, target, value, signature, data, eta);

        return returnData;
    }

    function getBlockTimestamp() internal view returns (uint256) {
        // solium-disable-next-line security/no-block-members
        return block.timestamp;
    }
}
// Original file came from Compound: https://github.com/compound-finance/compound-protocol/blob/master/contracts/Timelock.sol
// Original audit: https://blog.openzeppelin.com/compound-finance-patch-audit/
// Overview:
//    No Critical
//    No High
//
function setDelay(uint256 delay_)
        public
    {
        require(msg.sender == address(this), "Timelock::setDelay: Call must come from Timelock.");
        require(delay_ >= MINIMUM_DELAY, "Timelock::setDelay: Delay must exceed minimum delay.");
        require(delay_ <= MAXIMUM_DELAY, "Timelock::setDelay: Delay must not exceed maximum delay.");
        delay = delay_;

        emit NewDelay(delay);
    }
/**
 @notice sets the delay
 @param delay_ the new delay
 */