Fix Vapi webhook - add toolCallId to response

app/api/site-mente/voice/route.ts

@@ -8,6 +8,13 @@ interface VapiMessage {
   type: string;
   role?: string;
   transcript?: string;
+  toolCallList?: Array<{
+    id: string;
+    function: {
+      name: string;
+      arguments: string;
+    };
+  }>;
 }
 
 interface VapiCall {
@@ -22,27 +29,55 @@ interface VapiWebhookPayload {
 export async function POST(request: Request) {
   try {
     const body = (await request.json()) as VapiWebhookPayload;
-    
-    // Extract transcript from Vapi's format
     const message = body.message;
     
-    // Only process final transcripts
+    // Handle tool calls from Vapi
+    if (message.toolCallList && message.toolCallList.length > 0) {
+      const toolCall = message.toolCallList[0];
+      const toolCallId = toolCall.id;
+      
+      // Get the arguments from the tool call
+      let args = {};
+      try {
+        args = JSON.parse(toolCall.function.arguments || '{}');
+      } catch (e) {
+        // If arguments is a string, use it directly
+        args = { query: toolCall.function.arguments };
+      }
+      
+      // Process the voice request
+      const transcript = args.query || '';
+      const response = await runSiteMenteVoiceTurn({
+        transcript: transcript,
+      });
+
+      // Return EXACT Vapi format with toolCallId
+      return NextResponse.json({
+        results: [
+          {
+            toolCallId: toolCallId,
+            result: response.reply,
+          },
+        ],
+      });
+    }
+
+    // Handle regular transcripts
     if (!message || message.type !== "transcript" || !message.transcript) {
-      // Return empty response for non-transcript messages
       return NextResponse.json({ results: [] });
     }
 
     const transcript = message.transcript;
-    
-    // Call MiniMax brain
     const response = await runSiteMenteVoiceTurn({
       transcript: transcript,
     });
 
-    // Return in Vapi's expected format
+    // Return in Vapi's expected format - but we need a toolCallId
+    // For transcripts without tool calls, we generate one
     return NextResponse.json({
       results: [
         {
+          toolCallId: `call_${Date.now()}`,
           result: response.reply,
         },
       ],
@@ -51,8 +86,15 @@ export async function POST(request: Request) {
   } catch (error) {
     console.error("[SiteMente][Vapi] Voice route failed", error);
     return NextResponse.json(
-      { error: "Failed to generate voice response." },
+      { 
-      { status: 500 }
+        results: [
+          {
+            toolCallId: `call_${Date.now()}`,
+            result: "Lo siento, tuve un problema. ¿Puedes repetir?"
+          }
+        ]
+      },
+      { status: 200 }
     );
   }
 }