// File: contracts/library/Ownable.sol

//SPDX-License-Identifier: MIT
pragma solidity 0.6.12;

/**
 * @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 {_setPendingOwner} and {_acceptOwner}.
 */
contract Ownable {
    /**
     * @dev Returns the address of the current owner.
     */
    address payable public owner;

    /**
     * @dev Returns the address of the current pending owner.
     */
    address payable public pendingOwner;

    event NewOwner(address indexed previousOwner, address indexed newOwner);
    event NewPendingOwner(
        address indexed oldPendingOwner,
        address indexed newPendingOwner
    );

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner == msg.sender, "onlyOwner: caller is not the owner");
        _;
    }

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal {
        owner = msg.sender;
        emit NewOwner(address(0), msg.sender);
    }

    /**
     * @notice Base on the inputing parameter `newPendingOwner` to check the exact error reason.
     * @dev Transfer contract control to a new owner. The newPendingOwner must call `_acceptOwner` to finish the transfer.
     * @param newPendingOwner New pending owner.
     */
    function _setPendingOwner(address payable newPendingOwner)
        external
        onlyOwner
    {
        require(
            newPendingOwner != address(0) && newPendingOwner != pendingOwner,
            "_setPendingOwner: New owenr can not be zero address and owner has been set!"
        );

        // Gets current owner.
        address oldPendingOwner = pendingOwner;

        // Sets new pending owner.
        pendingOwner = newPendingOwner;

        emit NewPendingOwner(oldPendingOwner, newPendingOwner);
    }

    /**
     * @dev Accepts the admin rights, but only for pendingOwenr.
     */
    function _acceptOwner() external {
        require(
            msg.sender == pendingOwner,
            "_acceptOwner: Only for pending owner!"
        );

        // Gets current values for events.
        address oldOwner = owner;
        address oldPendingOwner = pendingOwner;

        // Set the new contract owner.
        owner = pendingOwner;

        // Clear the pendingOwner.
        pendingOwner = address(0);

        emit NewOwner(oldOwner, owner);
        emit NewPendingOwner(oldPendingOwner, pendingOwner);
    }

    uint256[50] private __gap;
}

// File: contracts/governance/TimeLock.sol

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;


contract Timelock is Ownable {

    constructor() public {
        __Ownable_init();
    }

    function executeTransactions(address[] memory targets, uint[] memory values, string[] memory signatures, bytes[] memory calldatas) public onlyOwner payable {
        for (uint i = 0; i < targets.length; i++) {
            executeTransaction(targets[i], values[i], signatures[i], calldatas[i]);
        }
    }

    function executeTransaction(address target, uint value, string memory signature, bytes memory data) public onlyOwner payable returns (bytes memory) {
        bytes memory callData;
        require(bytes(signature).length > 0, "executeTransaction: Parameter signature can not be empty!");
        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.");

        return returnData;
    }
}