feat(voice): add Flutter UI and platform channel for voice profile se…

android/app/src/main/kotlin/com/resonate/resonate/MainActivity.kt

@@ -1,6 +1,68 @@
 package com.resonate.resonate
 
+import android.util.Log
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
 
-class MainActivity: FlutterActivity() {
+class MainActivity : FlutterActivity() {
+
+    private val channelName = "voice_control_channel"
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+
+        MethodChannel(
+            flutterEngine.dartExecutor.binaryMessenger,
+            channelName
+        ).setMethodCallHandler { call, result ->
+            when (call.method) {
+                "setVoiceProfile" -> {
+                    val selectedVoice = call.argument<String>("selectedVoice")
+                    if (selectedVoice != null) {
+                        applyVoiceProfile(selectedVoice)
+                        result.success(null)
+                    } else {
+                        result.error(
+                            "INVALID_ARGUMENT",
+                            "selectedVoice must not be null",
+                            null
+                        )
+                    }
+                }
+                "setPreviewEnabled" -> {
+                    val isPreviewEnabled = call.argument<Boolean>("isPreviewEnabled")
+                    if (isPreviewEnabled != null) {
+                        setVoicePreviewEnabled(isPreviewEnabled)
+                        result.success(null)
+                    } else {
+                        result.error(
+                            "INVALID_ARGUMENT",
+                            "isPreviewEnabled must not be null",
+                            null
+                        )
+                    }
+                }
+                else -> result.notImplemented()
+            }
+        }
+    }
+
+    /**
+     * Apply the selected voice profile in the native audio processing layer.
+     * Replace the log statement with real DSP / audio-engine calls.
+     */
+    private fun applyVoiceProfile(profile: String) {
+        // TODO: forward to native audio engine
+        Log.d("VoiceControl", "Voice profile set: $profile")
+    }
+
+    /**
+     * Start or stop audio preview in the native audio processing layer.
+     * Replace the log statement with real DSP / audio-engine calls.
+     */
+    private fun setVoicePreviewEnabled(enabled: Boolean) {
+        // TODO: forward to native audio engine
+        Log.d("VoiceControl", "Preview enabled: $enabled")
+    }
 }

ios/Runner/AppDelegate.swift

@@ -4,20 +4,83 @@ import flutter_local_notifications
 
 @main
 @objc class AppDelegate: FlutterAppDelegate {
-
+
+  private let voiceControlChannelName = "voice_control_channel"
+
   override func application(
-
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
-
   ) -> Bool {
-    FlutterLocalNotificationsPlugin.setPluginRegistrantCallback { (registry) in
-    GeneratedPluginRegistrant.register(with: registry)
-  }
-  if #available(iOS 10.0, *) {
-  UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
-}
+    FlutterLocalNotificationsPlugin.setPluginRegistrantCallback { registry in
+      GeneratedPluginRegistrant.register(with: registry)
+    }
+    if #available(iOS 10.0, *) {
+      UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
+    }
     GeneratedPluginRegistrant.register(with: self)
+
+    // ── Voice control channel ────────────────────────────────────────────────
+    guard let controller = window?.rootViewController as? FlutterViewController else {
+      return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+    }
+
+    let voiceChannel = FlutterMethodChannel(
+      name: voiceControlChannelName,
+      binaryMessenger: controller.binaryMessenger
+    )
+
+    voiceChannel.setMethodCallHandler { [weak self] call, result in
+      switch call.method {
+      case "setVoiceProfile":
+        guard
+          let args = call.arguments as? [String: Any],
+          let selectedVoice = args["selectedVoice"] as? String
+        else {
+          result(FlutterError(
+            code: "INVALID_ARGUMENT",
+            message: "selectedVoice must not be nil",
+            details: nil
+          ))
+          return
+        }
+        self?.applyVoiceProfile(selectedVoice)
+        result(nil)
+
+      case "setPreviewEnabled":
+        guard
+          let args = call.arguments as? [String: Any],
+          let isPreviewEnabled = args["isPreviewEnabled"] as? Bool
+        else {
+          result(FlutterError(
+            code: "INVALID_ARGUMENT",
+            message: "isPreviewEnabled must not be nil",
+            details: nil
+          ))
+          return
+        }
+        self?.setVoicePreviewEnabled(isPreviewEnabled)
+        result(nil)
+
+      default:
+        result(FlutterMethodNotImplemented)
+      }
+    }
+    // ────────────────────────────────────────────────────────────────────────
+
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
+
+  /// Apply the selected voice profile in the native audio processing layer.
+  /// Replace the print with real AVAudioEngine / DSP calls.
+  private func applyVoiceProfile(_ profile: String) {
+    // TODO: forward to native audio engine
+    print("VoiceControl: voice profile set: \(profile)")
+  }
+
+  /// Start or stop audio preview in the native audio processing layer.
+  /// Replace the print with real AVAudioEngine / DSP calls.
+  private func setVoicePreviewEnabled(_ enabled: Bool) {
+    // TODO: forward to native audio engine
+    print("VoiceControl: preview enabled: \(enabled)")
+  }
 }

lib/controllers/voice_profile_controller.dart

@@ -0,0 +1,50 @@
+import 'package:get/get.dart';
+import '../services/voice_control_service.dart';
+
+class VoiceProfileController extends GetxController {
+  /// Available predefined voice profiles.
+  final List<String> voiceProfiles = const [
+    'Default',
+    'Deep',
+    'Soft',
+    'Energetic',
+    'Calm',
+  ];
+
+  /// Currently selected voice profile.
+  var selectedVoice = 'Default'.obs;
+
+  /// Whether preview playback is active.
+  var isPreviewEnabled = false.obs;
+
+  @override
+  void onInit() {
+    super.onInit();
+    // Notify native layer of the initial defaults.
+    _sendVoiceProfile();
+    _sendPreviewState();
+  }
+
+  /// Called when the user picks a different voice profile.
+  Future<void> onVoiceProfileChanged(String? voice) async {
+    if (voice == null || voice == selectedVoice.value) return;
+    selectedVoice.value = voice;
+    await _sendVoiceProfile();
+  }
+
+  /// Called when the user toggles the preview switch.
+  Future<void> onPreviewToggled(bool value) async {
+    isPreviewEnabled.value = value;
+    await _sendPreviewState();
+  }
+
+  // ─── private helpers ───────────────────────────────────────────────────────
+
+  Future<void> _sendVoiceProfile() async {
+    await VoiceControlService.setVoiceProfile(selectedVoice.value);
+  }
+
+  Future<void> _sendPreviewState() async {
+    await VoiceControlService.setPreviewEnabled(isPreviewEnabled.value);
+  }
+}

lib/routes/app_pages.dart

@@ -36,6 +36,7 @@ import 'package:resonate/views/screens/welcome_screen.dart';
 import '../bindings/tabview_binding.dart';
 import '../views/screens/about_app_screen.dart';
 import '../views/screens/contribute_screen.dart';
+import '../views/screens/voice_profile_screen.dart';
 
 class AppPages {
   static final List<GetPage> pages = [
@@ -149,5 +150,9 @@ class AppPages {
       name: AppRoutes.appPreferencesScreen,
       page: () => const AppPreferencesScreen(),
     ),
+    GetPage(
+      name: AppRoutes.voiceProfileScreen,
+      page: () => VoiceProfileScreen(),
+    ),
   ];
 }

lib/routes/app_routes.dart

@@ -35,4 +35,5 @@ class AppRoutes {
   static const userBlockedScreen = "/userBlockedScreen";
   static const liveChapterScreen = "/liveChapterScreen";
   static const appPreferencesScreen = "/appPreferencesScreen";
+  static const voiceProfileScreen = "/voiceProfileScreen";
 }

lib/services/voice_control_service.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/services.dart';
+
+/// Lightweight signal-only bridge to native audio processing.
+/// Flutter sends voice profile selection and preview toggle states;
+/// all audio work is performed on the native side.
+class VoiceControlService {
+  static const _channel = MethodChannel('voice_control_channel');
+
+  /// Sends the selected voice profile name to native code.
+  /// [selectedVoice] – identifier of the chosen voice profile.
+  static Future<void> setVoiceProfile(String selectedVoice) async {
+    await _channel.invokeMethod('setVoiceProfile', {
+      'selectedVoice': selectedVoice,
+    });
+  }
+
+  /// Notifies native code to enable or disable preview playback.
+  /// [isPreviewEnabled] – whether preview mode is active.
+  static Future<void> setPreviewEnabled(bool isPreviewEnabled) async {
+    await _channel.invokeMethod('setPreviewEnabled', {
+      'isPreviewEnabled': isPreviewEnabled,
+    });
+  }
+}

lib/views/screens/voice_profile_screen.dart

@@ -0,0 +1,124 @@
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:resonate/utils/ui_sizes.dart';
+import '../../controllers/voice_profile_controller.dart';
+
+class VoiceProfileScreen extends StatelessWidget {
+  VoiceProfileScreen({super.key});
+
+  final VoiceProfileController controller =
+      Get.put(VoiceProfileController());
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Voice Profile'),
+        backgroundColor: colorScheme.surface,
+        foregroundColor: colorScheme.onSurface,
+        elevation: 0,
+      ),
+      backgroundColor: colorScheme.surface,
+      body: SafeArea(
+        child: ListView(
+          padding: EdgeInsets.symmetric(
+            horizontal: UiSizes.width_20,
+            vertical: UiSizes.height_20,
+          ),
+          children: [
+            // ── Section: Voice Profile Selection ────────────────────────────
+            Text(
+              'Select Voice Profile',
+              style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                    color: colorScheme.onSurface,
+                    fontWeight: FontWeight.w600,
+                  ),
+            ),
+            SizedBox(height: UiSizes.height_12),
+            _VoiceProfileDropdown(controller: controller),
+            SizedBox(height: UiSizes.height_30),
+
+            // ── Section: Preview Toggle ──────────────────────────────────────
+            _PreviewToggleTile(controller: controller),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+// ─── Voice Profile Dropdown ───────────────────────────────────────────────────
+
+class _VoiceProfileDropdown extends StatelessWidget {
+  const _VoiceProfileDropdown({required this.controller});
+
+  final VoiceProfileController controller;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Obx(
+      () => DropdownButtonFormField<String>(
+        value: controller.selectedVoice.value,
+        decoration: InputDecoration(
+          labelText: 'Voice Profile',
+          border: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(12),
+          ),
+          prefixIcon: Icon(
+            Icons.record_voice_over_outlined,
+            color: colorScheme.primary,
+          ),
+        ),
+        items: controller.voiceProfiles
+            .map(
+              (profile) => DropdownMenuItem<String>(
+                value: profile,
+                child: Text(profile),
+              ),
+            )
+            .toList(),
+        onChanged: controller.onVoiceProfileChanged,
+      ),
+    );
+  }
+}
+
+// ─── Preview Toggle Tile ──────────────────────────────────────────────────────
+
+class _PreviewToggleTile extends StatelessWidget {
+  const _PreviewToggleTile({required this.controller});
+
+  final VoiceProfileController controller;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Container(
+      decoration: BoxDecoration(
+        border: Border.all(color: colorScheme.outline),
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Obx(
+        () => SwitchListTile(
+          title: const Text('Preview Mode'),
+          subtitle: Text(
+            controller.isPreviewEnabled.value ? 'On' : 'Off',
+            style: TextStyle(color: colorScheme.onSurfaceVariant),
+          ),
+          secondary: Icon(
+            Icons.headphones_outlined,
+            color: colorScheme.primary,
+          ),
+          value: controller.isPreviewEnabled.value,
+          onChanged: controller.onPreviewToggled,
+          activeColor: colorScheme.primary,
+        ),
+      ),
+    );
+  }
+}