import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:rogapp/features/data/checkpoint.dart';
import 'package:rogapp/features/data/data_provider.dart';
import 'package:rogapp/features/home/home_page.dart';
import 'package:rogapp/features/landing/denied_screen.dart';
import 'package:rogapp/features/initializer/app_initializer.dart';
import 'package:rogapp/features/services/checkpoint_repo.dart';
import 'package:rogapp/features/state/game_state.dart';
import 'package:rogapp/features/state/game_view_model.dart';

// LandingPage serves as the initial screen displayed by the application to perform necessary checks, initialize required values, and set up services essential for the app's functionality.

class LandingPage extends ConsumerStatefulWidget {
  const LandingPage({super.key});

  @override
  ConsumerState<LandingPage> createState() => _LandingPageState();
}

class _LandingPageState extends ConsumerState<LandingPage> {
  bool? _isInitialized;

  @override
  void initState() {
    super.initState();
    //load only if network available
    ref.read(featureCheckpointCollectionProvider.future);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _initializeApp();
    });
  }

  @override
  Widget build(BuildContext context) {
    AsyncValue<FeatureCollection> featureCollection =
        ref.watch(featureCheckpointCollectionProvider);

    return featureCollection.when(
      data: (data) {
        if (_isInitialized == null) {
          return const MaterialApp(
              home: Scaffold(body: Center(child: CircularProgressIndicator())));
        }

        return _isInitialized! ? const HomePage() : const DeniedScreen();
      },
      loading: () => const MaterialApp(
          home: Scaffold(body: Center(child: CircularProgressIndicator()))),
      error: (error, stack) => ErrorScreen(error: error),
    );
  }

  Future<void> _restoreAppState() async {
    final dataProvider = ref.read(dataProviderProvider);

    // Example values, replace these with actual values from user and event context
    String userName =
        "current_user"; // Fetch the current user's name or identifier
    String teamName = "user_team"; // Fetch the current user's team
    String eventCode = "event_code"; // Fetch the current event code

    // Load and restore game state
    String? gameStateKey = "current_game_state";
    String? gameStateValue = await dataProvider.getGameState(
        gameStateKey, userName, teamName, eventCode);
    if (gameStateValue != null) {
      Map<String, dynamic> gameStateData = jsonDecode(gameStateValue);
      GameState gameState = GameState.fromMap(gameStateData);
      ref.read(gameViewModelProvider.notifier).loadGameState(gameState);
    }

    // After restoring all necessary states, proceed with the app
    setState(() {
      _isInitialized = true;
    });
  }

  // Future<void> _restoreAppState() async {
  //   await _initializeApp();
  //   // Add additional restoration logic if needed, for example:
  //   // Restore game state, user progress, etc., from the DataProvider.
  //   // Example:
  //   // var gameState = await _dataProvider.getGameState('current_state');
  //   // Use the gameState to decide what to do next, e.g., navigate to a specific screen.

  //   if (_isInitialized != true) {
  //     // If initialization is not done, try to initialize the app.
  //     _isInitialized = await _initializeApp();
  //   }

  //   if (!_isInitialized!) {
  //     await _showRetryCloseDialog();
  //   } else {
  //     setState(() {
  //       _isInitialized = true;
  //     });
  //   }
  // }

  Future<bool> _initializeApp() async {
    AppInitializer initializer = AppInitializer();

    // Check if permissions are already granted
    bool permissionsAlreadyGranted = await initializer.permissionStatus();
    if (!permissionsAlreadyGranted) {
      await _showPermissionRequestMessage();
    }

    // Initialize the app and return the success status.
    return await initializer.initializeApp();
  }

  Future<void> _showPermissionRequestMessage() async {
    return showDialog(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext context) => AlertDialog(
        title: const Text('Permissions Required'),
        content: const Text(
            'This app requires certain permissions to function properly. Please grant these permissions in the next steps.'),
        actions: <Widget>[
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Okay'),
          ),
        ],
      ),
    );
  }

  Future<bool> _requestPermissionsAndInitialize() async {
    AppInitializer initializer = AppInitializer();
    return await initializer.initializeApp();
  }

  Future<void> _showRetryCloseDialog() async {
    await showDialog(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext context) => AlertDialog(
        title: const Text('Initialization Failed'),
        content: const Text(
            'The app was unable to start properly due to missing permissions.'),
        actions: <Widget>[
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Close'),
          ),
          TextButton(
            onPressed: () async {
              Navigator.of(context).pop();
              bool retrySuccess = await _requestPermissionsAndInitialize();
              if (!retrySuccess) {
                await _showRetryCloseDialog();
              } else {
                setState(() {
                  _isInitialized = true;
                });
              }
            },
            child: const Text('Retry'),
          ),
        ],
      ),
    );
  }

  ErrorScreen({required Object error}) {}
}