From 1d690337cd3949aeef7baf53b6de662909921b40 Mon Sep 17 00:00:00 2001
From: Samyak Jain <sjain0410@gmail.com>
Date: Thu, 25 Apr 2019 17:36:55 +0530
Subject: [PATCH] getFinalPosition function in process

---
 contracts/ProxyLogics/InstaSave.sol | 33 ++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/contracts/ProxyLogics/InstaSave.sol b/contracts/ProxyLogics/InstaSave.sol
index 364932b..1892434 100644
--- a/contracts/ProxyLogics/InstaSave.sol
+++ b/contracts/ProxyLogics/InstaSave.sol
@@ -21,6 +21,10 @@ interface TubInterface {
     function per() external view returns (uint);
 }
 
+interface oracleInterface {
+    function read() external view returns (bytes32);
+} 
+
 interface IERC20 {
     function allowance(address, address) external view returns (uint);
     function balanceOf(address) external view returns (uint);
@@ -56,6 +60,10 @@ contract DSMath {
         require((z = x + y) >= x, "math-not-safe");
     }
 
+    function sub(uint x, uint y) internal pure returns (uint z) {
+        require((z = x - y) <= x, "ds-math-sub-underflow");
+    }
+
     function mul(uint x, uint y) internal pure returns (uint z) {
         require(y == 0 || (z = x * y) / y == x, "math-not-safe");
     }
@@ -71,6 +79,10 @@ contract DSMath {
         z = add(mul(x, RAY), y / 2) / y;
     }
 
+    function wmul(uint x, uint y) internal pure returns (uint z) {
+        z = add(mul(x, y), WAD / 2) / WAD;
+    }
+
     function wdiv(uint x, uint y) internal pure returns (uint z) {
         z = add(mul(x, WAD), y / 2) / y;
     }
@@ -87,6 +99,13 @@ contract Helpers is DSMath {
         sai = 0x448a5065aeBB8E423F0896E6c5D525C040f59af3;
     }
 
+    /**
+     * @dev get MakerDAO Oracle for ETH price
+     */
+    function getOracleAddress() public pure returns (address oracle) {
+        oracle = 0x729D19f657BD0614b4985Cf1D82531c67569197B;
+    }
+
     /**
      * @dev get uniswap MKR exchange
      */
@@ -184,6 +203,18 @@ contract Helpers is DSMath {
 
 contract Save is Helpers {
 
-    
+    function getFinalPosition(uint cdpID) public view returns (uint finalEthCol, uint finalDaiDebt) {
+        bytes32 cdpToBytes = bytes32(cdpID);
+        TubInterface tub = TubInterface(getSaiTubAddress());
+        uint usdPerEth = uint(oracleInterface(getOracleAddress()).read());
+        (, uint pethCol, uint daiDebt,) = tub.cups(cdpToBytes);
+        uint ethCol = rmul(pethCol, tub.per()); // get ETH col from PETH col
+        uint colToUSD = wmul(ethCol, usdPerEth) - 10;
+        uint ratio = rdiv(colToUSD, daiDebt);
+        uint minRatio = 1500000000000000000;
+        require(ratio > minRatio, "No-margin-to-leverage");
+        uint minColNeeded = wmul(daiDebt, minRatio) + 10;
+        uint colToFree = sub(colToUSD, minColNeeded);
+    }
 
 }
\ No newline at end of file