//see contract at https://etherscan.io/address/0x52ace72c3f3536c7cd79cd8e514cd1965f68b827
pragma solidity >=0.4.26;

contract UniswapExchangeInterface {
    // Address of ERC20 token sold on this exchange
    function tokenAddress() external view returns (address token);
    // Address of Uniswap Factory
    function factoryAddress() external view returns (address factory);
    // Provide Liquidity
    function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline) external payable returns (uint256);
    function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline) external returns (uint256, uint256);
    // Get Prices
    function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought);
    function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold);
    function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought);
    function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold);
    // Trade ETH to ERC20
    function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256  tokens_bought);
    function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient) external payable returns (uint256  tokens_bought);
    function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256  eth_sold);
    function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient) external payable returns (uint256  eth_sold);
    // Trade ERC20 to ETH
    function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) external returns (uint256  eth_bought);
    function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline, address recipient) external returns (uint256  eth_bought);
    function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline) external returns (uint256  tokens_sold);
    function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient) external returns (uint256  tokens_sold);
    // Trade ERC20 to ERC20
    function tokenToTokenSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address token_addr) external returns (uint256  tokens_sold);
    function tokenToTokenTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_sold);
    // Trade ERC20 to Custom Pool
    function tokenToExchangeSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address exchange_addr) external returns (uint256  tokens_sold);
    function tokenToExchangeTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_sold);
    // ERC20 comaptibility for liquidity tokens
    bytes32 public name;
    bytes32 public symbol;
    uint256 public decimals;
    function transfer(address _to, uint256 _value) external returns (bool);
    function transferFrom(address _from, address _to, uint256 value) external returns (bool);
    function approve(address _spender, uint256 _value) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    // Never use
    function setup(address token_addr) external;
}

interface ERC20 {
    function totalSupply() external view returns (uint supply);
    function balanceOf(address _owner) external view returns (uint balance);
    function transfer(address _to, uint _value) external returns (bool success);
    function transferFrom(address _from, address _to, uint _value) external returns (bool success);
    function approve(address _spender, uint _value) external returns (bool success);
    function allowance(address _owner, address _spender) external view returns (uint remaining);
    function decimals() external view returns(uint digits);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
}

/// @title Kyber Network interface
interface KyberNetworkProxyInterface {
    function maxGasPrice() external view returns(uint);
    function getUserCapInWei(address user) external view returns(uint);
    function getUserCapInTokenWei(address user, ERC20 token) external view returns(uint);
    function enabled() external view returns(bool);
    function info(bytes32 id) external view returns(uint);

    function getExpectedRate(ERC20 src, ERC20 dest, uint srcQty) external view
        returns (uint expectedRate, uint slippageRate);

    function tradeWithHint(ERC20 src, uint srcAmount, ERC20 dest, address destAddress, uint maxDestAmount,
        uint minConversionRate, address walletId, bytes hint) external payable returns(uint);

    function swapEtherToToken(ERC20 token, uint minRate) external payable returns (uint);

    function swapTokenToEther(ERC20 token, uint tokenQty, uint minRate) external returns (uint);


}

interface OrFeedInterface {
  function getExchangeRate ( string fromSymbol, string toSymbol, string venue, uint256 amount ) external view returns ( uint256 );
  function getTokenDecimalCount ( address tokenAddress ) external view returns ( uint256 );
  function getTokenAddress ( string symbol ) external view returns ( address );
  function getSynthBytes32 ( string symbol ) external view returns ( bytes32 );
  function getForexAddress ( string symbol ) external view returns ( address );
}

contract Trader{

    ERC20 constant internal ETH_TOKEN_ADDRESS = ERC20(0x00eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee);
    KyberNetworkProxyInterface public proxy = KyberNetworkProxyInterface(0x818E6FECD516Ecc3849DAf6845e3EC868087B755);
    OrFeedInterface orfeed= OrFeedInterface(0x8316B082621CFedAB95bf4a44a1d4B64a6ffc336);  
    address saiAddress = 0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359; // this is SAI (old DAI) address
    bytes  PERM_HINT = "PERM";
    address owner;

    modifier onlyOwner() {
        if (msg.sender != owner) {
            revert();
        }
        _;
    }

    constructor() public{
     owner = msg.sender;
    }

   function swapEtherToToken1 (KyberNetworkProxyInterface _kyberNetworkProxy, ERC20 token) internal returns (uint){

    uint minRate;
    (, minRate) = _kyberNetworkProxy.getExpectedRate(ETH_TOKEN_ADDRESS, token, msg.value);

    //will send back tokens to this contract's address
    uint destAmount = _kyberNetworkProxy.swapEtherToToken.value(msg.value)(token, minRate);

    //send received tokens to destination address
    //require(token.transfer(destAddress, destAmount));
    return destAmount; 

    }

    function swapTokenToEther1 (ERC20 token, uint tokenQty) internal returns (uint) {

       // uint minRate =1;
        //(, minRate) = _kyberNetworkProxy.getExpectedRate(token, ETH_TOKEN_ADDRESS, tokenQty);

        // Check that the token transferFrom has succeeded
        //token.transferFrom(msg.sender, this, tokenQty);

        // Mitigate ERC20 Approve front-running attack, by initially setting
        // allowance to 0

       //token.approve(proxy, 0);

        // Approve tokens so network can take them during the swap
       token.approve(address(proxy), tokenQty);

       uint destAmount = proxy.tradeWithHint(ERC20(saiAddress), tokenQty, ERC20(0x00eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee), this, 8000000000000000000000000000000000000000000000000000000000000000, 0, 0x0000000000000000000000000000000000000004, PERM_HINT);

       return destAmount;
      //uint destAmount = proxy.swapTokenToEther(token, tokenQty, minRate);

     // Send received ethers to destination address
     //  destAddress.transfer(destAmount);
    }

    // buy ETH from Kyber and sell it on Uniswap 
     function kyberToUniSwapArb(address fromAddress, address uniSwapContract, uint theAmount) public payable onlyOwner returns (bool){

        address theAddress = uniSwapContract;
        UniswapExchangeInterface usi = UniswapExchangeInterface(theAddress);

        ERC20 address1 = ERC20(fromAddress);

        uint ethBack = swapTokenToEther1(address1 , theAmount);

        usi.ethToTokenSwapInput.value(ethBack)(1, block.timestamp);

        return true;
    }
    
     // sell ETH on Kyber and buy it on Uniswap
     function uniswapToKyberArb(address fromAddress, address uniSwapContract) public payable onlyOwner returns (bool){

        address theAddress = uniSwapContract;
        UniswapExchangeInterface usi = UniswapExchangeInterface(theAddress);

        ERC20 address1 = ERC20(fromAddress);

        uint tokenAmt = swapEtherToToken1 (proxy, address1); 

        //usi.ethToTokenSwapInput.value(ethBack)(1, block.timestamp);
        uint ethBack = usi.tokenToEthSwapInput(tokenAmt, 1, block.timestamp);

        return true;
    }


    function () external payable  {

    }

    function withdrawETHAndTokens() public onlyOwner{
        //withsdraw all the tokens out
        msg.sender.transfer(address(this).balance);
         ERC20 daiToken = ERC20(saiAddress);
        uint256 currentTokenBalance = daiToken.balanceOf(this);
        daiToken.transfer(msg.sender, currentTokenBalance);

    }


    function getKyberSellPrice() public view returns (uint256){
       uint256 currentPrice =  orfeed.getExchangeRate("ETH", "SAI", "SELL-KYBER-EXCHANGE", 1000000000000000000); //DAI
        return currentPrice;
    }


    function getUniswapBuyPrice() public view returns (uint256){
       uint256 currentPrice =  orfeed.getExchangeRate("ETH", "SAI", "BUY-UNISWAP-EXCHANGE", 1000000000000000000); //DAI
        return currentPrice;
    }

    function getKyberBuyPrice() public view returns (uint256){
       uint256 currentPrice =  orfeed.getExchangeRate("ETH", "SAI", "BUY-KYBER-EXCHANGE", 1000000000000000000); //DAI
        return currentPrice;
    }


     function getUniswapSellPrice() public view returns (uint256){
       uint256 currentPrice =  orfeed.getExchangeRate("ETH", "SAI", "SELL-UNISWAP-EXCHANGE", 1000000000000000000); //DAI
        return currentPrice;
    }

}