pragma solidity ^0.4.11;


import "./ownership/Multisig.sol";
import "./ownership/Shareable.sol";
import "./DayLimit.sol";


/**
 * MultisigWallet
 * Usage:
 *     bytes32 h = Wallet(w).from(oneOwner).execute(to, value, data);
 *     Wallet(w).from(anotherOwner).confirm(h);
 */
contract MultisigWallet is Multisig, Shareable, DayLimit {

  struct Transaction {
    address to;
    uint256 value;
    bytes data;
  }

  /**
   * Constructor, sets the owners addresses, number of approvals required, and daily spending limit
   * @param _owners A list of owners.
   * @param _required The amount required for a transaction to be approved.
   */
  constructor(address[] memory _owners, uint256 _required, uint256 _daylimit)
    Shareable(_owners, _required)
    DayLimit(_daylimit) public { }

  /**
   * @dev destroys the contract sending everything to `_to`.
   */
  function destroy(address _to) onlymanyowners(keccak256(msg.data)) external {
    selfdestruct(_to);
  }

  /**
   * @dev Fallback function, receives value and emits a deposit event.
   */
  function() external payable {
    // just being sent some cash?
    if (msg.value > 0)
      emit Deposit(msg.sender, msg.value);
  }

  /**
   * @dev Outside-visible transaction entry point. Executes transaction immediately if below daily
   * spending limit. If not, goes into multisig process. We provide a hash on return to allow the
   * sender to provide shortcuts for the other confirmations (allowing them to avoid replicating
   * the _to, _value, and _data arguments). They still get the option of using them if they want,
   * anyways.
   * @param _to The receiver address
   * @param _value The value to send
   * @param _data The data part of the transaction
   */
  function execute(address _to, uint256 _value, bytes calldata _data) external onlyOwner returns (bytes32 _r) {
    // first, take the opportunity to check that we're under the daily limit.
    if (underLimit(_value)) {
      emit SingleTransact(msg.sender, _value, _to, _data);
      // yes - just execute the call.
      (bool success,) = _to.call.value(_value)(_data);
      require(success);
      return 0;
    }
    // determine our operation hash.
    _r = keccak256(abi.encodePacked(msg.data, block.number));
    if (!confirm(_r) && txs[_r].to == address(0)) {
      txs[_r].to = _to;
      txs[_r].value = _value;
      txs[_r].data = _data;
      emit ConfirmationNeeded(_r, msg.sender, _value, _to, _data);
    }
  }

  /**
   * @dev Confirm a transaction by providing just the hash. We use the previous transactions map,
   * txs, in order to determine the body of the transaction from the hash provided.
   * @param _h The transaction hash to approve.
   */
  function confirm(bytes32 _h) onlymanyowners(_h) public returns (bool) {
    if (txs[_h].to != address(0)) {
      (bool success,) = txs[_h].to.call.value(txs[_h].value)(txs[_h].data);
      require(success);
      emit MultiTransact(msg.sender, _h, txs[_h].value, txs[_h].to, txs[_h].data);
      delete txs[_h];
      return true;
    }
  }

  /**
   * @dev Updates the daily limit value.
   * @param _newLimit  uint256 to represent the new limit.
   */
  function setDailyLimit(uint256 _newLimit) onlymanyowners(keccak256(msg.data)) external {
    _setDailyLimit(_newLimit);
  }

  /**
   * @dev Resets the value spent to enable more spending
   */
  function resetSpentToday() onlymanyowners(keccak256(msg.data)) external {
    _resetSpentToday();
  }


  // INTERNAL METHODS
  /**
   * @dev Clears the list of transactions pending approval.
   */
  function clearPending() internal {
    uint256 length = pendingsIndex.length;
    for (uint256 i = 0; i < length; ++i) {
      delete txs[pendingsIndex[i]];
    }
    super.clearPending();
  }


  // FIELDS

  // pending transactions we have at present.
  mapping (bytes32 => Transaction) txs;
}