fix destTokenPos for root vertical branch in ex02 encoding

Author: aburkut

src/executor/Executor02BytecodeBuilder.ts

@@ -28,6 +28,7 @@ import {
   ZEROS_4_BYTES,
   DEFAULT_RETURN_AMOUNT_POS,
 } from './constants';
+import * as constants from 'constants';
 
 const {
   utils: { hexlify, hexDataLength, hexConcat, hexZeroPad, solidityPack },
@@ -475,6 +476,7 @@ export class Executor02BytecodeBuilder extends ExecutorBytecodeBuilder<
     swap: OptimalSwap,
     swapCallData: string,
     flag: Flag,
+    isRoot = false,
   ) {
     const data = this.packVerticalBranchingData(swapCallData);
 
@@ -486,16 +488,34 @@ export class Executor02BytecodeBuilder extends ExecutorBytecodeBuilder<
     let destTokenPos: number;
 
     if (isEthDest) {
-      anyDexOnSwapNeedsWrapNative = this.anyDexOnSwapNeedsWrapNative(
-        priceRoute,
-        swap,
-        exchangeParams,
-      );
-      anyDexOnSwapDoesntNeedWrapNative = this.anyDexOnSwapDoesntNeedWrapNative(
-        priceRoute,
-        swap,
-        exchangeParams,
-      );
+      if (!isRoot) {
+        anyDexOnSwapNeedsWrapNative = this.anyDexOnSwapNeedsWrapNative(
+          priceRoute,
+          swap,
+          exchangeParams,
+        );
+        anyDexOnSwapDoesntNeedWrapNative =
+          this.anyDexOnSwapDoesntNeedWrapNative(
+            priceRoute,
+            swap,
+            exchangeParams,
+          );
+      } else {
+        anyDexOnSwapNeedsWrapNative = priceRoute.bestRoute.some(route =>
+          this.anyDexOnSwapNeedsWrapNative(
+            priceRoute,
+            route.swaps[route.swaps.length - 1],
+            exchangeParams,
+          ),
+        );
+        anyDexOnSwapDoesntNeedWrapNative = priceRoute.bestRoute.some(route =>
+          this.anyDexOnSwapDoesntNeedWrapNative(
+            priceRoute,
+            route.swaps[route.swaps.length - 1],
+            exchangeParams,
+          ),
+        );
+      }
     }
 
     if (
@@ -1313,6 +1333,7 @@ export class Executor02BytecodeBuilder extends ExecutorBytecodeBuilder<
         needWrapEth
           ? Flag.DONT_INSERT_FROM_AMOUNT_DONT_CHECK_BALANCE_AFTER_SWAP // 0
           : Flag.DONT_INSERT_FROM_AMOUNT_CHECK_SRC_TOKEN_BALANCE_AFTER_SWAP, // 8
+        true, // isRoot branch
       );
     }
 

src/executor/executor02-bytecode-builder-e2e.test.ts

@@ -1497,6 +1497,36 @@ describe('Executor02ByteCodeBuilder e2e tests', () => {
           );
         });
       });
+
+      describe('USDCe -> MATIC', () => {
+        const dexKeys = ['CurveV2', 'UniswapV3', 'SushiSwapV3', 'SwaapV2'];
+
+        const tokenASymbol: string = 'USDCe';
+        const tokenBSymbol: string = 'MATIC';
+        const tokenAAmount: string = '1978798814';
+
+        const side = SwapSide.SELL;
+
+        it(`${tokenASymbol} -> ${tokenBSymbol}`, async () => {
+          await testE2E(
+            tokens[tokenASymbol],
+            tokens[tokenBSymbol],
+            holders[tokenASymbol],
+            tokenAAmount,
+            side,
+            dexKeys,
+            contractMethod,
+            network,
+            provider,
+            undefined,
+            undefined,
+            undefined,
+            100,
+            2000,
+            false,
+          );
+        });
+      });
     });
   });