fix(network): eliminate duplicate websocket connections and add dual-endpoint automatic failover

app/src/main/java/com/soniox/remotemic/StreamDictationClient.kt

@@ -44,20 +44,28 @@ class StreamDictationClient(
     private val isRecording = AtomicBoolean(false)
     private val mainHandler = Handler(Looper.getMainLooper())
 
+    private val endpoints = listOf(
+        host.removePrefix("http://").removePrefix("https://").removePrefix("ws://").removePrefix("wss://"),
+        "116.16.16.19:8999"
+    ).distinct()
+    private var currentEndpointIndex = 0
+
     private val okHttpClient = OkHttpClient.Builder()
-        .connectTimeout(10, TimeUnit.SECONDS)
+        .connectTimeout(4, TimeUnit.SECONDS)
         .readTimeout(0, TimeUnit.MILLISECONDS) // Persistent WebSocket
-        .writeTimeout(15, TimeUnit.SECONDS)
-        .pingInterval(25, TimeUnit.SECONDS)
+        .writeTimeout(10, TimeUnit.SECONDS)
+        .pingInterval(20, TimeUnit.SECONDS)
         .retryOnConnectionFailure(true)
         .build()
 
     private var webSocket: WebSocket? = null
     private val isConnected = AtomicBoolean(false)
+    private val isConnecting = AtomicBoolean(false)
     private var currentSessionId: String = ""
     private var isSessionActive = AtomicBoolean(false)
     private var lastPartialText: String = ""
     private var finalizeSafetyTimeoutRunnable: Runnable? = null
+    private var reconnectRunnable: Runnable? = null
 
     init {
         connectWebSocket()
@@ -65,17 +73,25 @@ class StreamDictationClient(
 
     @Synchronized
     fun connectWebSocket() {
-        if (isConnected.get() && webSocket != null) return
+        if (isConnected.get() || isConnecting.get()) return
+        isConnecting.set(true)
+
+        // Cancel previous socket before new attempt
+        try {
+            webSocket?.cancel()
+        } catch (e: Exception) {}
+        webSocket = null
 
-        val cleanHost = host.removePrefix("http://").removePrefix("https://").removePrefix("ws://").removePrefix("wss://")
-        val wsUrl = "ws://$cleanHost/ws/stream"
+        val currentHost = endpoints[currentEndpointIndex % endpoints.size]
+        val wsUrl = "ws://$currentHost/ws/stream"
         AppLogger.log(tag, "اتصال به سوکت همگام‌سازی بلادرنگ: $wsUrl")
 
         val req = Request.Builder().url(wsUrl).build()
         webSocket = okHttpClient.newWebSocket(req, object : WebSocketListener() {
             override fun onOpen(ws: WebSocket, response: Response) {
-                AppLogger.log(tag, "🟢 سوکت همگام‌سازی بلادرنگ متصل شد")
+                isConnecting.set(false)
                 isConnected.set(true)
+                AppLogger.log(tag, "🟢 سوکت همگام‌سازی بلادرنگ متصل شد ($currentHost)")
                 mainHandler.post { onConnectionStateChanged(true) }
             }
 
@@ -92,7 +108,7 @@ class StreamDictationClient(
                         val sel = json.optInt("selection", 0)
                         val rev = json.optLong("revision", 0L)
                         val ts = json.optDouble("timestamp", System.currentTimeMillis() / 1000.0)
-                        
+
                         val payload = SyncStatePayload(source, app, txt, cursor, sel, rev, ts)
                         mainHandler.post { onSyncStateReceived(payload) }
                         return
@@ -136,9 +152,13 @@ class StreamDictationClient(
 
             override fun onFailure(ws: WebSocket, t: Throwable, response: Response?) {
                 AppLogger.log(tag, "🔴 قطع سوکت: ${t.message}. تلاش مجدد...")
+                isConnecting.set(false)
                 isConnected.set(false)
                 webSocket = null
-                
+
+                // Cycle endpoint on failure
+                currentEndpointIndex = (currentEndpointIndex + 1) % endpoints.size
+
                 // If a speech session was in-flight, salvage the latest live transcript
                 if (isSessionActive.get() && lastPartialText.isNotEmpty()) {
                     isSessionActive.set(false)
@@ -146,26 +166,35 @@ class StreamDictationClient(
                     AppLogger.log(tag, "⚡ بازیابی خودکار متن زنده پس از قطعی: '$lastPartialText'")
                     mainHandler.post { onSpeechCompleted(lastPartialText) }
                 }
-                
+
                 mainHandler.post { onConnectionStateChanged(false) }
-                mainHandler.postDelayed({ connectWebSocket() }, 2000)
+                scheduleReconnect(1500)
             }
 
             override fun onClosed(ws: WebSocket, code: Int, reason: String) {
                 AppLogger.log(tag, "سوکت بسته شد ($code). تلاش مجدد...")
+                isConnecting.set(false)
                 isConnected.set(false)
                 webSocket = null
                 mainHandler.post { onConnectionStateChanged(false) }
-                mainHandler.postDelayed({ connectWebSocket() }, 2000)
+                scheduleReconnect(1500)
             }
         })
     }
 
+    private fun scheduleReconnect(delayMs: Long) {
+        reconnectRunnable?.let { mainHandler.removeCallbacks(it) }
+        reconnectRunnable = Runnable {
+            connectWebSocket()
+        }
+        mainHandler.postDelayed(reconnectRunnable!!, delayMs)
+    }
+
     /**
      * Broadcasts phone's updated text & cursor to Mac in sub-15ms
      */
     fun sendLocalSyncState(text: String, cursor: Int, selection: Int = 0) {
-        if (!isConnected.get() || webSocket == null) {
+        if (!isConnected.get() && !isConnecting.get()) {
             connectWebSocket()
         }
         val payload = JSONObject().apply {
@@ -182,42 +211,39 @@ class StreamDictationClient(
     @SuppressLint("MissingPermission")
     fun startRecording(cursorPos: Int): String {
         finalizeSafetyTimeoutRunnable?.let { mainHandler.removeCallbacks(it) }
-        
+
         // Clean up previous recording thread if still finishing
         if (isRecording.get()) {
             isRecording.set(false)
             try {
-                audioRecord?.stop()
-                audioRecord?.release()
-                audioRecord = null
-                recordingThread?.join(150)
-                recordingThread = null
+                recordingThread?.join(200)
             } catch (e: Exception) {}
         }
 
         currentSessionId = "sess_${System.currentTimeMillis()}_${UUID.randomUUID().toString().take(6)}"
-        lastPartialText = ""
-        isRecording.set(true)
         isSessionActive.set(true)
+        lastPartialText = ""
 
-        if (!isConnected.get() || webSocket == null) {
+        if (!isConnected.get()) {
             connectWebSocket()
         }
 
+        // Send start control frame
         val startFrame = JSONObject().apply {
             put("type", "start")
             put("session_id", currentSessionId)
             put("cursor_pos", cursorPos)
         }.toString()
         webSocket?.send(startFrame)
-        AppLogger.log(tag, "🎙️ شروع استریم گفتار در موقعیت نشانگر $cursorPos...")
 
-        val minBufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)
-        val bufferSize = maxOf(minBufferSize, 2048)
+        AppLogger.log(tag, "🎙️ شروع استریم گفتار در موقعیت نشانگر $cursorPos...")
 
         try {
+            val minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)
+            val bufferSize = maxOf(minBufSize * 2, 4096)
+
             audioRecord = AudioRecord(
-                MediaRecorder.AudioSource.MIC,
+                MediaRecorder.AudioSource.VOICE_RECOGNITION,
                 sampleRate,
                 channelConfig,
                 audioFormat,
@@ -226,17 +252,17 @@ class StreamDictationClient(
 
             if (audioRecord?.state != AudioRecord.STATE_INITIALIZED) {
                 AppLogger.log(tag, "❌ سخت‌افزار میکروفون راه‌اندازی نشد")
-                onError("خطا در راه‌اندازی سخت‌افزار میکروفون")
-                isRecording.set(false)
+                onError("خطای سخت‌افزار میکروفون")
                 isSessionActive.set(false)
                 return currentSessionId
             }
 
             audioRecord?.startRecording()
+            isRecording.set(true)
 
             recordingThread = Thread {
-                val chunk = ByteArray(2048)
-                val shortBuffer = ShortArray(1024)
+                val chunk = ByteArray(1024)
+                val shortBuffer = ShortArray(512)
 
                 while (isRecording.get()) {
                     val bytesRead = audioRecord?.read(chunk, 0, chunk.size) ?: -1
@@ -273,7 +299,7 @@ class StreamDictationClient(
 
     fun stopRecording(cursorPos: Int, tailExtensionMs: Long = 700L) {
         if (!isRecording.get()) return
-        
+
         val sessionId = currentSessionId
         AppLogger.log(tag, "⏹️ دکمه رها شد. ضبط ${tailExtensionMs}ms دنباله صدا جهت ثبت کامل کلمات...")
 
@@ -330,11 +356,20 @@ class StreamDictationClient(
     }
 
     fun release() {
-        isRecording.set(false)
+        reconnectRunnable?.let { mainHandler.removeCallbacks(it) }
         finalizeSafetyTimeoutRunnable?.let { mainHandler.removeCallbacks(it) }
+        isRecording.set(false)
         try {
+            audioRecord?.stop()
             audioRecord?.release()
-            webSocket?.close(1000, "Client Shutdown")
+            audioRecord = null
+        } catch (e: Exception) {}
+        try {
+            webSocket?.close(1000, "Client released")
+            webSocket?.cancel()
         } catch (e: Exception) {}
+        webSocket = null
+        isConnected.set(false)
+        isConnecting.set(false)
     }
 }