added comments to swap quote function

wormhole-connect/src/routes/porticoBridge/porticoBridge.ts

@@ -154,28 +154,34 @@ export abstract class PorticoBridge extends BaseRoute {
     return true;
   }
 
+  // This function calculates the amounts for a token swap operation
   async computeSwapAmounts(
     sendAmount: number,
     token: string,
     destToken: string,
     sendingChain: ChainName | undefined,
     recipientChain: ChainName | undefined,
   ): Promise<PorticoSwapAmounts> {
+    // Validate the parameters
     if (!sendAmount || !destToken || !sendingChain || !recipientChain) {
       throw new Error('Invalid params');
     }
+    // Get the start and finish tokens
     const startToken = getWrappedToken(config.tokens[token]);
+    const finishToken = getWrappedToken(config.tokens[destToken]);
+    // Validate the tokens
     if (!startToken.tokenId) {
       throw new Error('Unable to get start token');
     }
-    const finishToken = getWrappedToken(config.tokens[destToken]);
     if (!finishToken.tokenId) {
       throw new Error('Unable to get finish token');
     }
+    // Get the canonical addresses of the start and finish tokens
     const [startCanonicalToken, finishCanonicalToken] = await Promise.all([
       getCanonicalTokenAddress(startToken),
       getCanonicalTokenAddress(finishToken),
     ]);
+    // Parse the send amount to the correct decimal representation
     const startTokenDecimals = getTokenDecimals(
       toChainId(sendingChain),
       startToken.tokenId,
@@ -184,53 +190,65 @@ export abstract class PorticoBridge extends BaseRoute {
       sendAmount.toString(),
       startTokenDecimals,
     );
+    // Get the quote for swapping the send amount
     const startQuote = await this.getQuote(
       sendingChain,
       startToken.tokenId.address,
       startCanonicalToken,
       parsedSendAmount,
       FEE_TIER,
     );
+    // Calculate the slippage for the start quote
     const startSlippage = startQuote.amountOut
       .mul(SLIPPAGE_BPS)
       .div(BPS_PER_HUNDRED_PERCENT);
+    // Validate the slippage
     if (startSlippage.gte(startQuote.amountOut)) {
       throw new Error('Start slippage too high');
     }
+    // Calculate the minimum amount for the start quote
     const minAmountStart = startQuote.amountOut.sub(startSlippage);
+    // Get the quote for the recipient chain
     const finishQuote = await this.getQuote(
       recipientChain,
       finishCanonicalToken,
       finishToken.tokenId.address,
       minAmountStart,
       FEE_TIER,
     );
+    // Calculate the slippage for the finish quote
     const finishSlippage = finishQuote.amountOut
       .mul(SLIPPAGE_BPS)
       .div(BPS_PER_HUNDRED_PERCENT);
+    // Validate the slippage
     if (finishSlippage.gte(finishQuote.amountOut)) {
       throw new Error('Finish slippage too high');
     }
+    // Calculate the minimum amount for the finish quote
     const minAmountFinish = finishQuote.amountOut.sub(finishSlippage);
+    // Get the quote for the recipient chain without slippage
     const amountFinishQuote = await this.getQuote(
       recipientChain,
       finishCanonicalToken,
       finishToken.tokenId.address,
       startQuote.amountOut, // no slippage
       FEE_TIER,
     );
-    // the expected receive amount is the amount out from the swap
-    // minus 5bps slippage
+    // Calculate the slippage for the finish quote
     const amountFinishSlippage = amountFinishQuote.amountOut
       .mul(5)
       .div(BPS_PER_HUNDRED_PERCENT);
+    // Validate the slippage
     if (amountFinishSlippage.gte(amountFinishQuote.amountOut)) {
       throw new Error('Amount finish slippage too high');
     }
+    // Calculate the final amount for the finish quote
     const amountFinish = amountFinishQuote.amountOut.sub(amountFinishSlippage);
+    // Validate the final amount
     if (amountFinish.lte(minAmountFinish)) {
       throw new Error('Amount finish too low');
     }
+    // Return the calculated amounts
     return {
       minAmountStart: minAmountStart.toString(),
       minAmountFinish: minAmountFinish.toString(),