contract PasswordEscrow {

  using SafeMath for uint256;

  address public owner;
  uint256 public commissionFee;
  uint256 public totalFee;

  uint256 private randSeed = 50;

  //data
  struct Transfer {
    address from;
    uint256 amount;
  }

  mapping(bytes32 => Transfer) private password;
  mapping(address => uint256) private randToAddress;

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  event LogChangeCommissionFee(uint256 fee);
  event LogChangeOwner(address indexed exOwner, address indexed newOwner);
  event LogDeposit(address indexed from, uint256 amount);
  event LogGetTransfer(address indexed from, address indexed recipient, uint256 amount);


  constructor(uint256 _fee) public {
    commissionFee = _fee;
    owner = msg.sender;
  }

  function changeCommissionFee(uint256 _fee) public onlyOwner {
    commissionFee = _fee;
    emit LogChangeCommissionFee(_fee);
  }

  function changeOwner(address _newOwner) public onlyOwner {
    emit LogChangeOwner(owner, _newOwner);
    owner = _newOwner;
  }

  //escrow
  function deposit(bytes32 _password) public payable {
    require(msg.value > commissionFee);

    uint256 rand = _rand();
    bytes32 pass = sha3(_password, rand);
    randToAddress[msg.sender] = rand;
    password[pass].from = msg.sender;
    password[pass].amount = password[pass].amount.add(msg.value);

    _updateSeed();

    emit LogDeposit(msg.sender, msg.value);
  }

  function _rand() private view returns(uint256) {
    uint256 rand = uint256(sha3(now, block.number, randSeed));
    return rand %= (10 ** 6);
  }

  function _updateSeed() private {
    randSeed = _rand();
  }

  function viewRand() public view returns(uint256) {
    return randToAddress[msg.sender];
  }

  function getTransfer(bytes32 _password, uint256 _number) public {
    require(password[sha3(_password, _number)].amount > 0);

    bytes32 pass = sha3(_password, _number);
    address from = password[pass].from;
    uint256 amount = password[pass].amount;
    amount = amount.sub(commissionFee);
    totalFee = totalFee.add(commissionFee);

    _updateSeed();

    password[pass].amount = 0;

    msg.sender.transfer(amount);

    emit LogGetTransfer(from, msg.sender, amount);
  }

  function withdrawFee() public payable onlyOwner {
    require( totalFee > 0);

    uint256 fee = totalFee;
    totalFee = 0;

    owner.transfer(fee);
  }

  function withdraw() public payable onlyOwner {
    owner.transfer(this.balance);
  }


}
function deposit(bytes32 _password) public payable {
    require(msg.value > commissionFee);

    uint256 rand = _rand();
    bytes32 pass = sha3(_password, rand);
    randToAddress[msg.sender] = rand;
    password[pass].from = msg.sender;
    password[pass].amount = password[pass].amount.add(msg.value);

    _updateSeed();

    emit LogDeposit(msg.sender, msg.value);
  }
//escrow