// voice_recognition_service.dart

import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:flutter/foundation.dart';
import 'volcano_asr_service.dart';
import 'package:get/get.dart';

class VoiceRecognitionService extends GetxService {
  VolcanoAsrService? _asrService;
  bool _isInitialized = false;
  bool _isStoppingRecognition = false;

  final isRecognizing = false.obs;

  Function(String)? onRecognitionResult;
  Function(String)? onError;
  Function()? onRecognitionComplete;
  Function(String)? onSentenceComplete;
  Function(String)? onConnectionStatusChanged;

  VoiceRecognitionService();

  void _logError(String message, [dynamic error, StackTrace? stackTrace]) {
    debugPrint('🔴 VoiceRecognitionService Error: $message');
    if (error != null) debugPrint('Error details: $error');
    if (stackTrace != null) debugPrint('Stack trace: $stackTrace');
  }

  @override
  Future<void> onInit() async {
    super.onInit();
    if (!_isInitialized) {
      try {
        await _initializeServices();
        _isInitialized = true;
        debugPrint('✅ VoiceRecognitionService initialized successfully');
      } catch (e, stackTrace) {
        _logError('Failed to initialize services', e, stackTrace);
        rethrow;
      }
    }
  }

  Future<void> _initializeServices() async {
    try {
      final appKey = dotenv.env['VOLCANO_APP_KEY'];
      final accessKey = dotenv.env['VOLCANO_ACCESS_KEY'];
      if (appKey == null || accessKey == null) {
        throw Exception('Volcano ASR service configuration is missing. Please check your .env file.');
      }
      _asrService = VolcanoAsrService(
        appKey: appKey,
        accessKey: accessKey,
        onResult: _handleRecognitionResult,
        onError: _handleError,
        onConnectionStatusChanged: _handleConnectionStatusChanged,
      );
      await _setupServices();
    } catch (e, stackTrace) {
      _logError('Error during service initialization', e, stackTrace);
      rethrow;
    }
  }

  Future<void> _setupServices() async {
    try {
      _asrService?.onResult = (result) {
        debugPrint('ASR Result: $result');
        onRecognitionResult?.call(result);
        onSentenceComplete?.call(result);
      };
      _asrService?.onError = (error) {
        _logError('ASR service error', error);
        onError?.call('ASR error: $error');
      };
      _asrService?.onConnectionStatusChanged = (status) {
        final isConnected = status == 'connected';
        debugPrint('ASR Connection status: $status');
        if (!isConnected && isRecognizing.value && !_isStoppingRecognition) {
          stopRecognition();
          onRecognitionComplete?.call();
        }
        onConnectionStatusChanged?.call(status);
      };
    } catch (e, stackTrace) {
      _logError('Error during services setup', e, stackTrace);
      rethrow;
    }
  }

  Future<void> startRecognition() async {
    if (isRecognizing.value || _asrService == null) {
      debugPrint('⚠️ Cannot start recognition: ${isRecognizing.value ? 'Already recognizing' : 'ASR service not initialized'}');
      return;
    }
    try {
      _isStoppingRecognition = false;
      debugPrint('Starting voice recognition...');
      await _asrService?.startRecognition();
      isRecognizing.value = true;
    } catch (e, stackTrace) {
      _logError('Failed to start recognition', e, stackTrace);
      onError?.call('Failed to start recognition: $e');
      await stopRecognition();
    }
  }

  Future<void> stopRecognition() async {
    if (!isRecognizing.value || _asrService == null || _isStoppingRecognition) return;
    try {
      _isStoppingRecognition = true;
      debugPrint('Stopping voice recognition...');
      isRecognizing.value = false;
      await _asrService?.stopRecognition().timeout(
        const Duration(seconds: 3),
        onTimeout: () {
          debugPrint('ASR service stop timeout, forcing cleanup');
          _cleanupResources();
        },
      );
      final complete = onRecognitionComplete;
      if (complete != null) {
        Future.microtask(complete);
      }
    } catch (e, stackTrace) {
      _logError('Failed to stop recognition', e, stackTrace);
      onError?.call('Failed to stop recognition: $e');
      _cleanupResources();
    } finally {
      _isStoppingRecognition = false;
    }
  }

  void _cleanupResources() {
    if (_asrService != null) {
      _asrService!.onResult = null;
      _asrService!.onError = null;
      _asrService!.onConnectionStatusChanged = null;
    }
    isRecognizing.value = false;
    _isStoppingRecognition = false;
  }

  void _handleRecognitionResult(String result) {
    onRecognitionResult?.call(result);
  }

  void _handleError(String error) {
    onError?.call(error);
  }

  void _handleConnectionStatusChanged(String status) {
    onConnectionStatusChanged?.call(status);
  }

  @override
  void onClose() {
    debugPrint('Cleaning up VoiceRecognitionService...');
    stopRecognition().then((_) {
      debugPrint('VoiceRecognitionService cleanup completed');
      super.onClose();
    }).catchError((e) {
      debugPrint('Error during VoiceRecognitionService cleanup: $e');
      super.onClose();
    });
  }
}