refactor(v4-sdk): simplify midPrice in Route entity (#180)

Co-authored-by: Emily Williams <[email protected]>

sdks/v4-sdk/src/entities/route.ts

@@ -65,28 +65,9 @@ export class Route<TInput extends Currency, TOutput extends Currency> {
   public get midPrice(): Price<TInput, TOutput> {
     if (this._midPrice !== null) return this._midPrice
 
-    const price = this.pools.slice(1).reduce(
-      ({ nextInput, price }, pool) => {
-        return nextInput.equals(pool.currency0)
-          ? {
-              nextInput: pool.currency1,
-              price: price.multiply(pool.currency0Price),
-            }
-          : {
-              nextInput: pool.currency0,
-              price: price.multiply(pool.currency1Price),
-            }
-      },
-      this.pools[0].currency0.equals(this.input)
-        ? {
-            nextInput: this.pools[0].currency1,
-            price: this.pools[0].currency0Price,
-          }
-        : {
-            nextInput: this.pools[0].currency0,
-            price: this.pools[0].currency1Price,
-          }
-    ).price
+    const price = this.pools.slice(1).reduce((price, pool) => {
+      return price.multiply(pool.priceOf(price.quoteCurrency))
+    }, this.pools[0].priceOf(this.pathInput))
 
     return (this._midPrice = new Price(this.input, this.output, price.denominator, price.numerator))
   }