Merge branch 'logics' of https://github.com/InstaDApp/yield-contract into logics

contracts/logics/settle/eth/maxComp.sol

@@ -2,23 +2,79 @@
 pragma solidity ^0.6.8;
 pragma experimental ABIEncoderV2;
 
-import { DSMath } from "../../../libs/safeMath.sol";
+import { DSMath } from "../../libs/safeMath.sol";
+
+interface CTokenInterface {
+    function borrowBalanceCurrent(address account) external returns (uint256);
+    function exchangeRateCurrent() external returns (uint256);
+
+    function balanceOf(address owner) external view returns (uint256);
+
+    function underlying() external view returns (address);
+}
 
 interface DSAInterface {
     function cast(address[] calldata _targets, bytes[] calldata _datas, address _origin) external payable;
 }
 
+interface CompTroller {
+    function getAllMarkets() external view returns (address[] memory);
+}
+
+interface OracleComp {
+    function getUnderlyingPrice(address) external view returns (uint);
+}
+
+interface InstaMapping {
+    function cTokenMapping(address) external view returns (address);
+}
+
 contract LogicOne {
 
+    address public constant compTrollerAddr = address(0xe81F70Cc7C0D46e12d70efc60607F16bbD617E88);
+    address public constant cethAddr = address(0xe81F70Cc7C0D46e12d70efc60607F16bbD617E88);
+    address public constant cdaiAddr = address(0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643);
+    address public constant ethAddr = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
+    address public constant compOracleAddr = address(0xe81F70Cc7C0D46e12d70efc60607F16bbD617E88);
+
+    function getCompoundNetAssetsInEth(address _dsa) private returns (uint256 _netBal) {
+        uint totalSupplyInETH;
+        uint totalBorrowInETH;
+        address[] memory allMarkets = CompTroller(compTrollerAddr).getAllMarkets();
+        OracleComp priceFeedContract = OracleComp(compOracleAddr);
+        // uint ethPrice = oracleContract.getUnderlyingPrice(cethAddr);
+        for (uint i = 0; i < allMarkets.length; i++) {
+            CTokenInterface ctoken = CTokenInterface(allMarkets[i]);
+            uint tokenPriceInETH = priceFeedContract.getPrice(address(ctoken) == cethAddr ? ethAddr : ctoken.underlying());
+            uint supply = wmul(ctoken.balanceOf(_dsa), ctoken.exchangeRateCurrent());
+            uint supplyInETH = wmul(supply, tokenPriceInETH);
+
+            uint borrow = ctoken.borrowBalanceCurrent(_dsa);
+            uint borrowInETH = wmul(borrow, tokenPriceInETH);
+
+            totalSupplyInETH += add(totalSupplyInETH, supplyInETH);
+            totalBorrowInETH = add(totalBorrowInETH, borrowInETH);
+
+            if (allMarkets[i] != cdaiAddr && allMarkets[i] != cethAddr) {
+                require(supply == 0 && borrow == 0, "assets");
+            }
+            // require()
+        }
+        _netBal = sub(totalSupplyInETH, totalBorrowInETH);
+    }
+
     function maxComp(address _dsa, address[] calldata _targets, bytes[] calldata _data) public {
         // check if DSA is authorised for interaction
         // Also think on dydx flash loan connector
+        // initial Compound position borrow and supply
         address compoundConnector = address(0); // Check9898 - address of compound connector
         address instaPoolConnector = address(0); // Check9898 - address of instaPool connector
         for (uint i = 0; i < _targets.length; i++) {
             require(_targets[i] == compoundConnector || _targets[i] == instaPoolConnector, "connector-not-authorised");
         }
         DSAInterface(_dsa).cast(_targets, _data, address(0)); // Check9898 - address of basic connector
+        // final Compound position borrow and supply
+        // check the chnages should only be in eth supply & dai
         // check if status is safe and only have assets in the specific tokens
     }