fix repayAll has left

contracts/DODOV3MM/D3Vault/D3VaultFunding.sol

@@ -88,6 +88,7 @@ contract D3VaultFunding is D3VaultStorage {
 
         uint256 interests = usedQuota - record.amount;
 
+        if (record.amount == 0 && usedQuota + amount > 0) { borrowerCount++; }
         record.amount = usedQuota + amount;
         record.interestIndex = info.borrowIndex;
         info.totalBorrows = info.totalBorrows + amount;
@@ -116,6 +117,8 @@ contract D3VaultFunding is D3VaultStorage {
         } else {
             info.totalBorrows = info.totalBorrows - amount;
         }
+        if (record.amount == 0) { borrowerCount--; }
+        if (borrowerCount == 0) { info.totalBorrows = 0; }
         info.balance = info.balance + amount;
         IERC20(token).safeTransferFrom(msg.sender, address(this), amount);
 
@@ -143,6 +146,8 @@ contract D3VaultFunding is D3VaultStorage {
         } else {
             info.totalBorrows = info.totalBorrows - amount;
         }
+        borrowerCount--;
+        if (borrowerCount == 0) { info.totalBorrows = 0; }
         info.balance = info.balance + amount;
         IERC20(token).safeTransferFrom(pool, address(this), amount);
 

contracts/DODOV3MM/D3Vault/D3VaultStorage.sol

@@ -28,6 +28,7 @@ contract D3VaultStorage is ReentrancyGuard, Ownable {
     uint256 public IM; // 1e18 = 100%
     uint256 public MM; // 1e18 = 100%
     uint256 public DISCOUNT = 95e16; // 95%
+    uint256 public borrowerCount;
     uint256 internal constant SECONDS_PER_YEAR = 31536000;
     uint256 internal constant DEFAULT_MINIMUM_DTOKEN = 1000;
 

test/DODOV3MM/D3Vault/D3VaultFunding.t.sol

@@ -220,6 +220,74 @@ contract D3VaultFundingTest is TestContext {
         vm.stopPrank();
     }
 
+    function testPoolRepayAllHasLeft() public {
+        vm.prank(user1);
+        token2.approve(address(dodoApprove), type(uint256).max);
+
+        mockUserQuota.setUserQuota(user1, address(token2), 1000 * 1e18);
+        token2.mint(user1, 1000 * 1e18);
+        vm.prank(user1);
+        d3Proxy.userDeposit(user1, address(token2), 500 * 1e18, 0);
+
+        token2.mint(address(d3MM), 100 * 1e18);
+        poolBorrow(address(d3MM), address(token2), 100 * 1e18);
+
+        for (uint256 i; i <= 365; i++) {
+            vm.warp(i * 24 * 3600 + 1);
+            d3Vault.accrueInterest(address(token2));
+            console.log("day", i);
+            logBorrows(address(token2));
+        }
+
+        vm.startPrank(address(d3MM));
+        token2.approve(address(d3Vault), type(uint256).max);
+        d3Vault.poolRepayAll(address(token2));
+        vm.stopPrank();
+
+        console.log("repay all");
+        logBorrows(address(token2));
+
+        assertEq(d3Vault.getTotalBorrows(address(token1)), 0);
+    }
+
+    function testPoolRepayAllSmallDecimals() public {
+        vm.prank(user1);
+        token1.approve(address(dodoApprove), type(uint256).max);
+
+        mockUserQuota.setUserQuota(user1, address(token1), 1000 * 1e8);
+        token1.mint(user1, 1000 * 1e8);
+        vm.prank(user1);
+        d3Proxy.userDeposit(user1, address(token1), 500 * 1e8, 0);
+
+        token1.mint(address(d3MM), 100 * 1e8);
+        poolBorrow(address(d3MM), address(token1), 100 * 1e8);
+
+        for (uint256 i; i <= 365; i++) {
+            vm.warp(i * 24 * 3600 + 1);
+            d3Vault.accrueInterest(address(token1));
+            console.log("day", i);
+            logBorrows(address(token1));
+        }
+
+        vm.startPrank(address(d3MM));
+        token1.approve(address(d3Vault), type(uint256).max);
+        d3Vault.poolRepayAll(address(token1));
+        vm.stopPrank();
+
+        console.log("repay all");
+        logBorrows(address(token1));
+
+        assertEq(d3Vault.getTotalBorrows(address(token1)), 0);
+    }
+
+    function logBorrows(address token) private {
+        uint256 poolBorrow = d3Vault.getPoolBorrowAmount(address(d3MM), token);
+        uint256 totalBorrow = d3Vault.getTotalBorrows(token);
+        console.log("pool Borrow", poolBorrow);
+        console.log("totalBorrow", totalBorrow);
+        console.log();
+    }
+
     function testCompoundInterestRate() public {
         assertEq(d3Vault.getCompoundInterestRate(3e18, 0), 1e18);
         assertEq(d3Vault.getCompoundInterestRate(3e18, 1), 4e18);