pragma solidity ^0.4.24;

library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns(uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns(uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns(uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns(uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}


contract EthToSmthSwaps {

  using SafeMath for uint;

  address public owner;
  address public ratingContractAddress;
  uint256 SafeTime = 1 hours; // atomic swap timeOut

  struct Swap {
    address targetWallet;
    bytes32 secret;
    bytes20 secretHash;
    uint256 createdAt;
    uint256 balance;
  }

  // ETH Owner => BTC Owner => Swap
  mapping(address => mapping(address => Swap)) public swaps;
  mapping(address => mapping(address => uint)) public participantSigns;

  constructor () public {
    owner = msg.sender;
  }




  event CreateSwap(address _buyer, address _seller, uint256 _value, bytes20 _secretHash, uint256 createdAt);

  // ETH Owner creates Swap with secretHash
  // ETH Owner make token deposit
  function createSwap(bytes20 _secretHash, address _participantAddress) public payable {
    require(msg.value > 0);
    require(swaps[msg.sender][_participantAddress].balance == uint256(0));

    swaps[msg.sender][_participantAddress] = Swap(
      _participantAddress,
      bytes32(0),
      _secretHash,
      now,
      msg.value
    );

    CreateSwap(_participantAddress, msg.sender, msg.value, _secretHash, now);
  }

  // ETH Owner creates Swap with secretHash
  // ETH Owner make token deposit
  function createSwapTarget(bytes20 _secretHash, address _participantAddress, address _targetWallet) public payable {
    require(msg.value > 0);
    require(swaps[msg.sender][_participantAddress].balance == uint256(0));

    swaps[msg.sender][_participantAddress] = Swap(
      _targetWallet,
      bytes32(0),
      _secretHash,
      now,
      msg.value
    );

    CreateSwap(_participantAddress, msg.sender, msg.value, _secretHash, now);
  }

  function getBalance(address _ownerAddress) public view returns (uint256) {
    return swaps[_ownerAddress][msg.sender].balance;
  }

  // Get target wallet (buyer check)
  function getTargetWallet(address _ownerAddress) public returns (address) {
      return swaps[_ownerAddress][msg.sender].targetWallet;
  }

  event Withdraw(address _buyer, address _seller, uint256 withdrawnAt);

  // BTC Owner withdraw money and adds secret key to swap
  // BTC Owner receive +1 reputation
  function withdraw(bytes32 _secret, address _ownerAddress) public {
    Swap memory swap = swaps[_ownerAddress][msg.sender];

    require(swap.secretHash == ripemd160(_secret));
    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) > now);

    swap.targetWallet.transfer(swap.balance);

    swaps[_ownerAddress][msg.sender].balance = 0;
    swaps[_ownerAddress][msg.sender].secret = _secret;

    Withdraw(msg.sender, _ownerAddress, now); 
  }
  // BTC Owner withdraw money and adds secret key to swap
  // BTC Owner receive +1 reputation
  function withdrawNoMoney(bytes32 _secret, address participantAddress) public {
    Swap memory swap = swaps[msg.sender][participantAddress];

    require(swap.secretHash == ripemd160(_secret));
    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) > now);

    swap.targetWallet.transfer(swap.balance);

    swaps[msg.sender][participantAddress].balance = 0;
    swaps[msg.sender][participantAddress].secret = _secret;

    Withdraw(participantAddress, msg.sender, now); 
  }
  // BTC Owner withdraw money and adds secret key to swap
  // BTC Owner receive +1 reputation
  function withdrawOther(bytes32 _secret, address _ownerAddress, address participantAddress) public {
    Swap memory swap = swaps[_ownerAddress][participantAddress];

    require(swap.secretHash == ripemd160(_secret));
    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) > now);

    swap.targetWallet.transfer(swap.balance);

    swaps[_ownerAddress][participantAddress].balance = 0;
    swaps[_ownerAddress][participantAddress].secret = _secret;

    Withdraw(participantAddress, _ownerAddress, now); 
  }

  // ETH Owner receive secret
  function getSecret(address _participantAddress) public view returns (bytes32) {
    return swaps[msg.sender][_participantAddress].secret;
  }

  event Close(address _buyer, address _seller);



  event Refund(address _buyer, address _seller);

  // ETH Owner refund money
  // BTC Owner gets -1 reputation
  function refund(address _participantAddress) public {
    Swap memory swap = swaps[msg.sender][_participantAddress];

    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) < now);

    msg.sender.transfer(swap.balance);

    clean(msg.sender, _participantAddress);

    Refund(_participantAddress, msg.sender);
  }

  function clean(address _ownerAddress, address _participantAddress) internal {
    delete swaps[_ownerAddress][_participantAddress];
    delete participantSigns[_ownerAddress][_participantAddress];
  }
}