import 'dart:developer';
import 'package:flutter/foundation.dart';
import 'package:test_sa/modules/cx_module/chat/services/call_manager.dart';
import 'package:test_sa/modules/cx_module/chat/services/signalr_service.dart';

/// App-level initialization service
/// Handles initialization of core services like SignalR and CallManager
class AppInitializationService {
  static final AppInitializationService _instance = AppInitializationService._internal();
  factory AppInitializationService() => _instance;
  AppInitializationService._internal();

  bool _isInitialized = false;
  bool get isInitialized => _isInitialized;

  /// Initialize SignalR and CallManager after user login
  /// This should be called from the landing page after successful login
  Future<void> initializeAfterLogin({
    required String userId,
    required String authToken,
    required String employeeNumber,
    String? conversationId,
    String? moduleId,
    String? referenceId,
  }) async {
    if (_isInitialized) {
      log('⚠️ [APP INIT] Already initialized, skipping...', name: 'AppInitializationService');
      return;
    }

    try {
      log('═══════════════════════════════════════════', name: 'AppInitializationService');
      log('🚀 [APP INIT] Starting app initialization...', name: 'AppInitializationService');
      log('   User ID: $userId', name: 'AppInitializationService');
      log('   Employee Number: $employeeNumber', name: 'AppInitializationService');
      log('═══════════════════════════════════════════', name: 'AppInitializationService');

      // Step 1: Initialize SignalR Service
      log('🔌 [APP INIT] Step 1: Initializing SignalR Service...', name: 'AppInitializationService');
      final signalRService = SignalRService();

      final connected = await signalRService.initialize(
        userId: userId,
        authToken: authToken,
        conversationId: conversationId,
      );

      if (!connected) {
        throw Exception('Failed to initialize SignalR connection');
      }
      log('✅ [APP INIT] SignalR Service initialized', name: 'AppInitializationService');
      log('   Connection State: ${signalRService.connectionState}', name: 'AppInitializationService');
      log('   Connection ID: ${signalRService.connectionId ?? "NULL"}', name: 'AppInitializationService');

      // Step 2: Initialize CallManager
      log('📞 [APP INIT] Step 2: Initializing CallManager...', name: 'AppInitializationService');
      await CallManager().initialize(
        userId: userId,
        authToken: authToken,
        conversationId: conversationId,
        moduleId: moduleId,
        referenceId: referenceId,
        employeeNumber: employeeNumber,
      );
      log('✅ [APP INIT] CallManager initialized', name: 'AppInitializationService');

      _isInitialized = true;

      log('═══════════════════════════════════════════', name: 'AppInitializationService');
      log('✅ [APP INIT] App initialization complete!', name: 'AppInitializationService');
      log('   ✅ SignalR Service: Ready', name: 'AppInitializationService');
      log('   ✅ CallManager: Ready', name: 'AppInitializationService');
      log('   ✅ WebRTC: Will initialize on first call', name: 'AppInitializationService');
      log('═══════════════════════════════════════════', name: 'AppInitializationService');

    } catch (e, stackTrace) {
      log('❌ [APP INIT] Initialization failed: $e',
          name: 'AppInitializationService', error: e, stackTrace: stackTrace);
      _isInitialized = false;
      rethrow;
    }
  }

  /// Reset initialization state (for logout)
  Future<void> reset() async {
    log('🔄 [APP INIT] Resetting app initialization...', name: 'AppInitializationService');

    try {
      // Reset CallManager
      await CallManager().reset();

      // Disconnect SignalR
      await SignalRService().disconnect();

      _isInitialized = false;

      log('✅ [APP INIT] Reset complete', name: 'AppInitializationService');
    } catch (e) {
      log('⚠️ [APP INIT] Error during reset: $e', name: 'AppInitializationService');
    }
  }

  /// Check if services are ready for calling
  bool areServicesReady() {
    final signalRConnected = SignalRService().isConnected;
    final callManagerInitialized = CallManager().isCallInProgress || _isInitialized;

    return signalRConnected && _isInitialized;
  }
}