/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/

// solhint-disable
pragma solidity ^0.4.15;

import "./MultiSigWallet.sol";


/// @title Multisignature wallet with time lock- Allows multiple parties to execute a transaction after a time lock has passed.
/// @author Amir Bandeali - <amir@0xProject.com>
contract MultiSigWalletWithTimeLock is
    MultiSigWallet
{

    event ConfirmationTimeSet(uint256 indexed transactionId, uint256 confirmationTime);
    event TimeLockChange(uint256 secondsTimeLocked);

    uint256 public secondsTimeLocked;

    mapping (uint256 => uint256) public confirmationTimes;

    modifier notFullyConfirmed(uint256 transactionId) {
        require(!isConfirmed(transactionId));
        _;
    }

    modifier fullyConfirmed(uint256 transactionId) {
        require(isConfirmed(transactionId));
        _;
    }

    modifier pastTimeLock(uint256 transactionId) {
        require(block.timestamp >= confirmationTimes[transactionId] + secondsTimeLocked);
        _;
    }

    /*
     * Public functions
     */

    /// @dev Contract constructor sets initial owners, required number of confirmations, and time lock.
    /// @param _owners List of initial owners.
    /// @param _required Number of required confirmations.
    /// @param _secondsTimeLocked Duration needed after a transaction is confirmed and before it becomes executable, in seconds.
    function MultiSigWalletWithTimeLock(
        address[] _owners,
        uint256 _required,
        uint256 _secondsTimeLocked
    )
        public
        MultiSigWallet(_owners, _required)
    {
        secondsTimeLocked = _secondsTimeLocked;
    }

    /// @dev Changes the duration of the time lock for transactions.
    /// @param _secondsTimeLocked Duration needed after a transaction is confirmed and before it becomes executable, in seconds.
    function changeTimeLock(uint256 _secondsTimeLocked)
        public
        onlyWallet
    {
        secondsTimeLocked = _secondsTimeLocked;
        TimeLockChange(_secondsTimeLocked);
    }

    /// @dev Allows an owner to confirm a transaction.
    /// @param transactionId Transaction ID.
    function confirmTransaction(uint256 transactionId)
        public
        ownerExists(msg.sender)
        transactionExists(transactionId)
        notConfirmed(transactionId, msg.sender)
        notFullyConfirmed(transactionId)
    {
        confirmations[transactionId][msg.sender] = true;
        Confirmation(msg.sender, transactionId);
        if (isConfirmed(transactionId)) {
            setConfirmationTime(transactionId, block.timestamp);
        }
    }

    /// @dev Allows anyone to execute a confirmed transaction.
    /// @param transactionId Transaction ID.
    function executeTransaction(uint256 transactionId)
        public
        notExecuted(transactionId)
        fullyConfirmed(transactionId)
        pastTimeLock(transactionId)
    {
        Transaction storage txn = transactions[transactionId];
        txn.executed = true;
        if (external_call(txn.destination, txn.value, txn.data.length, txn.data))
            Execution(transactionId);
        else {
            ExecutionFailure(transactionId);
            txn.executed = false;
        }
    }

    /*
     * Internal functions
     */

    /// @dev Sets the time of when a submission first passed.
    function setConfirmationTime(uint256 transactionId, uint256 confirmationTime)
        internal
    {
        confirmationTimes[transactionId] = confirmationTime;
        ConfirmationTimeSet(transactionId, confirmationTime);
    }
}