import 'dart:developer';
import 'package:flutter/widgets.dart';
import 'package:test_sa/core/di/service_locator.dart';
import 'package:test_sa/modules/cx_module/chat/services/call_manager.dart';

/// App lifecycle observer to handle pending calls when app resumes
class AppLifecycleObserver with WidgetsBindingObserver {
  static final AppLifecycleObserver _instance = AppLifecycleObserver._internal();
  factory AppLifecycleObserver() => _instance;
  AppLifecycleObserver._internal();

  bool _isInitialized = false;
  bool _hasCheckedPendingCall = false;

  /// Initialize the lifecycle observer
  void initialize() {
    if (_isInitialized) {
      log('⚠️ [LIFECYCLE] Already initialized', name: 'AppLifecycleObserver');
      return;
    }

    log('🔧 [LIFECYCLE] Initializing app lifecycle observer', name: 'AppLifecycleObserver');
    WidgetsBinding.instance.addObserver(this);
    _isInitialized = true;
    log('✅ [LIFECYCLE] Observer initialized', name: 'AppLifecycleObserver');

    // Check for pending calls immediately on app start
    _checkPendingCallsOnStart();
  }

  /// Dispose the observer
  void dispose() {
    if (_isInitialized) {
      log('🧹 [LIFECYCLE] Disposing lifecycle observer', name: 'AppLifecycleObserver');
      WidgetsBinding.instance.removeObserver(this);
      _isInitialized = false;
    }
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    log('═══════════════════════════════════════════', name: 'AppLifecycleObserver');
    log('🔄 [LIFECYCLE] App state changed: ${state.name}', name: 'AppLifecycleObserver');

    switch (state) {
      case AppLifecycleState.resumed:
        log('✅ [LIFECYCLE] App resumed - checking for pending calls', name: 'AppLifecycleObserver');
        _onAppResumed();
        break;
      case AppLifecycleState.inactive:
        log('⏸️ [LIFECYCLE] App inactive', name: 'AppLifecycleObserver');
        break;
      case AppLifecycleState.paused:
        log('⏸️ [LIFECYCLE] App paused', name: 'AppLifecycleObserver');
        break;
      case AppLifecycleState.detached:
        log('🔴 [LIFECYCLE] App detached', name: 'AppLifecycleObserver');
        break;
      case AppLifecycleState.hidden:
        log('🔴 [LIFECYCLE] App hidden', name: 'AppLifecycleObserver');
        break;
    }
    log('═══════════════════════════════════════════', name: 'AppLifecycleObserver');
  }

  /// Check for pending calls when app starts
  Future<void> _checkPendingCallsOnStart() async {
    try {
      // Wait a bit for app to fully initialize
      await Future.delayed(const Duration(milliseconds: 500));

      log('═══════════════════════════════════════════', name: 'AppLifecycleObserver');
      log('🔍 [LIFECYCLE] Checking for pending calls on app start...', name: 'AppLifecycleObserver');

      if (getIt.isRegistered<CallManager>()) {
        final callManager = getIt<CallManager>();
        await callManager.checkForPendingCalls();
        _hasCheckedPendingCall = true;
        log('✅ [LIFECYCLE] Pending call check complete', name: 'AppLifecycleObserver');
      } else {
        log('⚠️ [LIFECYCLE] CallManager not registered yet', name: 'AppLifecycleObserver');
      }

      log('═══════════════════════════════════════════', name: 'AppLifecycleObserver');
    } catch (e, stackTrace) {
      log('❌ [LIFECYCLE] Error checking pending calls on start: $e\nStack: $stackTrace',
          name: 'AppLifecycleObserver');
    }
  }

  /// Handle app resumed state
  Future<void> _onAppResumed() async {
    try {
      // Check for pending calls if we haven't already
      if (!_hasCheckedPendingCall) {
        log('🔍 [LIFECYCLE] First resume - checking for pending calls', name: 'AppLifecycleObserver');
        if (getIt.isRegistered<CallManager>()) {
          final callManager = getIt<CallManager>();
          await callManager.checkForPendingCalls();
          _hasCheckedPendingCall = true;
        }
      }

      // Handle pending navigation (if call was accepted while app was launching)
      if (getIt.isRegistered<CallManager>()) {
        final callManager = getIt<CallManager>();
        await callManager.handlePendingNavigation();
      }
    } catch (e, stackTrace) {
      log('❌ [LIFECYCLE] Error handling app resumed: $e\nStack: $stackTrace',
          name: 'AppLifecycleObserver');
    }
  }

  /// Reset state (for testing)
  void reset() {
    _hasCheckedPendingCall = false;
    log('🔄 [LIFECYCLE] State reset', name: 'AppLifecycleObserver');
  }
}