// import express from "express";
// import http from "http";
// import { Server } from "socket.io";
// import { GoogleGenAI, Modality } from "@google/genai";
// import path from "path";
// import { fileURLToPath } from "url";

// const __filename = fileURLToPath(import.meta.url);
// const __dirname = path.dirname(__filename);

// const app = express();
// const server = http.createServer(app);
// const io = new Server(server, { 
//   cors: { 
//     origin: "*",
//     methods: ["GET", "POST"]
//   } 
// });

// app.use(express.static(path.join(__dirname, "public")));

// // ⚠️ کلید API خود را اینجا قرار دهید
// const ai = new GoogleGenAI({
//   apiKey: "AIzaSyC9kWntTutd2jnUvY7IqMAozZAOeZ47QUE"
// });

// // مدل مناسب برای Gemini Live
// const model = "gemini-2.5-flash-native-audio-preview-09-2025";

// const config = {
//   responseModalities: [Modality.AUDIO],
//   systemInstruction: "You are a helpful voice assistant. Always respond with audio. You are called 'دستیار صوتی هوشمند دیدوان'. Respond concisely in the same language as the user."
// };

// io.on("connection", async (socket) => {
//   console.log("✅ Client connected:", socket.id);

//   let session;
//   let audioChunkCount = 0;
//   let receivedChunkCount = 0;

//   try {
//     // اتصال به Gemini Live API
//     session = await ai.live.connect({
//       model,
//       config,
//       callbacks: {
//         onmessage: (msg) => {
//           // Log complete message structure for debugging
//           if (msg?.setupComplete) {
//             console.log("📩 Gemini: Setup Complete");
//             return;
//           }
          
//           if (msg?.toolCall || msg?.toolCallCancellation) {
//             console.log("📩 Gemini: Tool call (ignoring)");
//             return;
//           }
          
//           console.log("📩 Raw Gemini Message:", JSON.stringify(msg).substring(0, 500));
          
//           // ✅ بررسی مسیر اول: msg.data (برای استریم‌های مستقیم صوتی)
//           if (msg?.data) {
//             const base64Audio = msg.data;
//             audioChunkCount++;
//             console.log("🔊 [Route 1] Sending audio chunk #" + audioChunkCount + ": " + base64Audio.length + " chars");
//             socket.emit("gemini_audio_chunk", base64Audio);
//             return;
//           }
          
//           // ✅ بررسی مسیر دوم: msg.serverContent.modelTurn.parts
//           if (msg?.serverContent?.modelTurn?.parts) {
//             console.log("📦 Found serverContent.modelTurn.parts, checking for audio...");
//             const parts = msg.serverContent.modelTurn.parts;
//             for (const part of parts) {
//               // Log part structure
//               console.log("  Part keys:", Object.keys(part));
              
//               if (part.text) {
//                 console.log("  📝 Text part:", part.text);
//               }
              
//               if (part.inlineData) {
//                 console.log("  💾 InlineData mimeType:", part.inlineData.mimeType);
//                 console.log("  💾 InlineData size:", part.inlineData.data?.length || 0, "chars");
                
//                 if (part.inlineData.mimeType?.startsWith("audio/")) {
//                   const base64Audio = part.inlineData.data;
//                   const mimeType = part.inlineData.mimeType;
//                   audioChunkCount++;
//                   console.log("🔊 [Route 2] Sending audio chunk #" + audioChunkCount + ": " + base64Audio.length + " chars, mime: " + mimeType);
                  
//                   // ارسال به کلاینت با اطلاعات mime
//                   socket.emit("gemini_audio_chunk", {
//                     data: base64Audio,
//                     mimeType: mimeType
//                   });
//                 }
//               }
//             }
//           }
          
//           // ✅ بررسی پایان نوبت
//           if (msg?.serverContent?.turnComplete) {
//             console.log("✅ Gemini turn complete");
//           }
//         },
//         onerror: (e) => {
//           console.error("❌ Gemini Session Error:", e);
//           socket.emit("error", "Gemini connection error");
//         },
//         onclose: (event) => {
//           console.log("🔒 Gemini session closed:", event?.code, event?.reason);
//         }
//       }
//     });
    
//     console.log("✨ Gemini Session Connected for client:", socket.id);
    
//   } catch (e) {
//     console.error("🔥 Failed to connect to Gemini:", e);
//     socket.emit("error", "Failed to connect to AI service");
//     return;
//   }

//   // ✅ دریافت صدا از کلاینت فلاتر
//   socket.on("audio_chunk", async (base64Chunk) => {
//     if (!session) {
//       console.error("⚠️ No active Gemini session");
//       return;
//     }
    
//     receivedChunkCount++;
//     console.log("📥 Received chunk #" + receivedChunkCount + " from client: " + base64Chunk.length + " chars");
    
//     try {
//       // ✅ فرمت صحیح برای ارسال به Gemini Live API
//       await session.sendRealtimeInput([{
//         mimeType: "audio/pcm;rate=16000",
//         data: base64Chunk
//       }]);
      
//       console.log("✅ Sent chunk #" + receivedChunkCount + " to Gemini");
      
//       // Gemini should auto-detect turn completion based on audio silence
      
//     } catch (e) {
//       console.error("❌ Error sending chunk to Gemini:", e.message, e.stack);
//     }
//   });

//   socket.on("disconnect", () => {
//     console.log("❌ Client disconnected: " + socket.id);
//     console.log("📊 Stats - Received: " + receivedChunkCount + " chunks, Sent: " + audioChunkCount + " chunks");
//     if (session) {
//       session.close();
//       session = null;
//     }
//   });
// });

// const PORT = 3001;
// server.listen(PORT, "0.0.0.0", () => {
//   console.log(`🚀 Server running on port ${PORT}`);
//   console.log(`🌐 Access from network: http://<YOUR_IP>:${PORT}`);
// });