// ignore_for_file: unused_field, deprecated_member_use

import 'dart:io';

import 'package:didvan/constants/assets.dart';
import 'package:didvan/main.dart';
import 'package:didvan/providers/media.dart';
import 'package:didvan/providers/server_data.dart';
import 'package:didvan/providers/theme.dart';
import 'package:didvan/providers/user.dart';
import 'package:didvan/routes/routes.dart';
import 'package:didvan/services/app_home_widget/home_widget_repository.dart';
import 'package:didvan/services/app_initalizer.dart';
import 'package:didvan/services/network/request.dart';
import 'package:didvan/services/network/request_helper.dart';
import 'package:didvan/services/storage/storage.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:in_app_update/in_app_update.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:provider/provider.dart';
import 'package:universal_html/html.dart' as html;
import 'package:url_launcher/url_launcher.dart';

class Splash extends StatefulWidget {
  const Splash({Key? key}) : super(key: key);

  @override
  State<Splash> createState() => _SplashState();
}

class _SplashState extends State<Splash> with SingleTickerProviderStateMixin {
  bool _errorOccured = false;
  late AnimationController _pulseController;
  late Animation<double> _pulseAnimation;

  @override
  void initState() {
    super.initState();

    if (kIsWeb) {
      final loader = html.document.getElementById('loading_indicator');
      if (loader != null) {
        loader.remove();
      }
    }

    _setupAnimations();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _startInitialization();
    });
  }

  void _setupAnimations() {
    _pulseController = AnimationController(
      duration: const Duration(milliseconds: 1500),
      vsync: this,
    );

    _pulseAnimation = Tween<double>(
      begin: 1.0,
      end: 1.1,
    ).animate(CurvedAnimation(
      parent: _pulseController,
      curve: Curves.easeInOut,
    ));

    _pulseController.repeat(reverse: true);
  }

  @override
  void dispose() {
    _pulseController.dispose();
    super.dispose();
  }

  void _startInitialization() {
    final themeProvider = context.read<ThemeProvider>();
    final userProvider = context.read<UserProvider>();
    final mediaProvider = context.read<MediaProvider>();
    _initialize(themeProvider, userProvider, mediaProvider);
  }

  @override
  Widget build(BuildContext context) {
    final isDark = Theme.of(context).brightness == Brightness.dark;
    final colorScheme = Theme.of(context).colorScheme;

    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: isDark ? Brightness.light : Brightness.dark,
        systemNavigationBarColor: colorScheme.background,
      ),
      child: Scaffold(
        resizeToAvoidBottomInset: true,
        backgroundColor: colorScheme.background,
        body: SafeArea(
          child: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                const Spacer(flex: 2),
                _buildLogo(),
                const SizedBox(height: 60),
                if (_errorOccured)
                  _buildErrorView(colorScheme)
                else
                  _buildLoadingView(colorScheme),
                const Spacer(flex: 3),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildLogo() {
    return SvgPicture.asset(
      Assets.horizontalLogoWithText,
      height: 80,
    );
  }

  Widget _buildLoadingView(ColorScheme colorScheme) {
    return Column(
      children: [
        SizedBox(
          width: 60,
          height: 60,
          child: Image.asset(
            Assets.loadingAnimation,
            fit: BoxFit.contain,
          ),
        ),
        const SizedBox(height: 24),
        AnimatedBuilder(
          animation: _pulseController,
          builder: (context, child) {
            return Opacity(
              opacity: 0.4 + (0.4 * _pulseController.value),
              child: Text(
                'در حال بارگذاری...',
                style: TextStyle(
                  fontSize: 14,
                  color: colorScheme.onBackground.withOpacity(0.6),
                  fontWeight: FontWeight.w400,
                ),
              ),
            );
          },
        ),
      ],
    );
  }

  Widget _buildErrorView(ColorScheme colorScheme) {
    return Column(
      children: [
        Container(
          width: 56,
          height: 56,
          decoration: BoxDecoration(
            color: colorScheme.error.withOpacity(0.1),
            shape: BoxShape.circle,
          ),
          child: Icon(
            Icons.wifi_off_rounded,
            size: 24,
            color: colorScheme.error,
          ),
        ),
        const SizedBox(height: 16),
        Text(
          'مشکل در اتصال',
          style: TextStyle(
            fontSize: 16,
            color: colorScheme.onBackground,
            fontWeight: FontWeight.w500,
          ),
        ),
        const SizedBox(height: 8),
        Text(
          'لطفاً اتصال اینترنت خود را بررسی کنید',
          style: TextStyle(
            fontSize: 13,
            color: colorScheme.onBackground.withOpacity(0.6),
          ),
        ),
        const SizedBox(height: 24),
        ElevatedButton(
          onPressed: () {
            setState(() {
              _errorOccured = false;
            });
            _startInitialization();
          },
          style: ElevatedButton.styleFrom(
            backgroundColor: colorScheme.primary,
            foregroundColor: Colors.white,
            elevation: 0,
            padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 12),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(12),
            ),
          ),
          child: const Text('تلاش مجدد'),
        ),
      ],
    );
  }

  Future<void> _initialize(ThemeProvider themeProvider,
      UserProvider userProvider, MediaProvider mediaProvider) async {
    try {
      if (!mounted) return;

      final settingsData = await AppInitializer.initilizeSettings();
      themeProvider.themeMode = settingsData.themeMode;
      themeProvider.fontFamily = settingsData.fontFamily;
      themeProvider.fontScale = settingsData.fontScale;

      if (mounted) {
        await AppInitializer.setupServices(context);
      }

      final String? token = await userProvider.setAndGetToken();
      if (token != null) {
        RequestService.token = token;
      }

      if (!kIsWeb && (Platform.isAndroid || Platform.isIOS)) {
        bool stopForUpdate = await _checkForUpdate();
        if (stopForUpdate) return;
      }

      if (kIsWeb) {
        html.window.onBeforeUnload.listen((event) {
          StorageService.webStorage
              .removeWhere((key, value) => key == 'image-cache');
        });
      }

      bool isMobileApp = !kIsWeb && (Platform.isAndroid || Platform.isIOS);
      if (isMobileApp) {
        final String? hasSeenOnboarding =
            await StorageService.getValue(key: 'hasSeenOnboarding');

        if (hasSeenOnboarding != 'true') {
          if (mounted) {
            Navigator.of(context).pushReplacementNamed(Routes.onboarding);
          }
          return;
        }
      }

      if (token != null) {
        if (!kIsWeb) {
          await mediaProvider.getDownloadsList();
        }

        // Add timeout for getUserInfo to prevent blocking on slow networks
        final result = await userProvider.getUserInfo().timeout(
          const Duration(seconds: 15),
          onTimeout: () {
            debugPrint("getUserInfo timed out - treating as failure");
            return false;
          },
        );

        if (!result) {
          await StorageService.delete(key: 'token');
          if (mounted) {
            Navigator.of(context).pushNamedAndRemoveUntil(
              Routes.splash,
              (_) => false,
            );
          }
          return;
        }
        
        // Add timeout for ServerDataProvider.getData()
        try {
          await ServerDataProvider.getData().timeout(
            const Duration(seconds: 10),
            onTimeout: () {
              debugPrint("ServerDataProvider.getData timed out - continuing without server data");
            },
          );
        } catch (e) {
          debugPrint("ServerDataProvider.getData failed: $e - continuing");
          // Continue even if server data fetch fails
        }
      }

      _navigateToNextScreen(token);
    } catch (e) {
      debugPrint("Error in initialize: $e");
      if (mounted) {
        setState(() {
          _errorOccured = true;
        });
      }
    }
  }

  void _navigateToNextScreen(String? token) async {
    if (!mounted) return;

    String extractedPath = initialURI?.path == '/'
        ? Routes.home
        : (initialURI?.path ?? Routes.home);

    final String destinationRoute =
        token == null ? Routes.authenticaion : extractedPath;

    dynamic routeArguments =
        token == null ? {'isResetPassword': false} : {'showDialogs': false};

    if (destinationRoute == Routes.home) {
      initialURI = null;
    }

    if (destinationRoute == Routes.authenticaion) {
      routeArguments = false;
    }

    if (token != null && HomeWidgetRepository.data != null) {
      Navigator.of(context).pushReplacementNamed(
        Routes.home,
        arguments: {'showDialogs': false},
      );

      await HomeWidgetRepository.decideWhereToGoNotif();

      if (HomeWidgetRepository.data != null) {
        await StorageService.delete(
            key:
                'notification${AppInitializer.createNotificationId(HomeWidgetRepository.data!)}');
      }
      return;
    }

    Navigator.of(context).pushReplacementNamed(
      destinationRoute,
      arguments: routeArguments,
    );
  }

  Future<bool> _checkForUpdate() async {
    try {
      PackageInfo packageInfo = await PackageInfo.fromPlatform();
      bool isGooglePlay = packageInfo.installerStore == 'com.android.vending';

      if (isGooglePlay) {
        try {
          AppUpdateInfo updateInfo = await InAppUpdate.checkForUpdate();
          if (updateInfo.updateAvailability ==
              UpdateAvailability.updateAvailable) {
            if (updateInfo.immediateUpdateAllowed) {
              await InAppUpdate.performImmediateUpdate();
              return true;
            } else if (updateInfo.flexibleUpdateAllowed) {
              await InAppUpdate.startFlexibleUpdate();
              await InAppUpdate.completeFlexibleUpdate();
              return false;
            }
          }
        } catch (e) {
          return await _checkCustomApiUpdate(packageInfo);
        }
      } else {
        return await _checkCustomApiUpdate(packageInfo);
      }
    } catch (e) {
      debugPrint("Update check failed: $e");
    }
    return false;
  }

  Future<bool> _checkCustomApiUpdate(PackageInfo packageInfo) async {
    final req = RequestService(
      RequestHelper.checkVersion,
      useAutherization: true,
    );

    await req.httpGet();

    if (req.isSuccess && mounted) {
      final result = req.result;
      final apiVersion = result['version']?.toString();
      final bool isMandatory = result['isMandatory'] ?? false;
      final String downloadUrl =
          result['appName'] ?? 'https://api.didvan.app/uploads/apk';

      if (apiVersion != null &&
          _isUpdateAvailable(packageInfo.version, apiVersion)) {
        _showUpdateDialog(downloadUrl, isMandatory);
        return isMandatory;
      }
    }
    return false;
  }

  bool _isUpdateAvailable(String currentVersion, String newVersion) {
    try {
      List<int> currentParts =
          currentVersion.split('.').map(int.parse).toList();
      List<int> newParts = newVersion.split('.').map(int.parse).toList();

      for (int i = 0; i < newParts.length; i++) {
        if (i >= currentParts.length) return true;

        if (newParts[i] > currentParts[i]) return true;
        if (newParts[i] < currentParts[i]) return false;
      }
      return false;
    } catch (e) {
      debugPrint("Version parsing error: $e");
      return false;
    }
  }

  void _showUpdateDialog(String url, bool isMandatory) {
    if (!mounted) return;

    showDialog(
      context: context,
      barrierDismissible: !isMandatory,
      builder: (context) {
        return PopScope(
          canPop: !isMandatory,
          child: AlertDialog(
            title: const Text(
              'به‌روزرسانی دیدوان',
              textAlign: TextAlign.center,
              style: TextStyle(fontWeight: FontWeight.bold),
            ),
            content: Text(
              isMandatory
                  ? 'نسخه جدیدی از دیدوان در دسترس است. برای ادامه استفاده از برنامه باید آن را به‌روزرسانی کنید.'
                  : 'نسخه جدیدی از برنامه در دسترس است. آیا مایل به به‌روزرسانی هستید؟',
              textAlign: TextAlign.center,
            ),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(16),
            ),
            actionsAlignment: MainAxisAlignment.center,
            actions: [
              if (!isMandatory)
                TextButton(
                  onPressed: () => Navigator.pop(context),
                  child:
                      const Text('بعداً', style: TextStyle(color: Colors.grey)),
                ),
              ElevatedButton(
                onPressed: () async {
                  final Uri uri = Uri.parse(url);
                  if (await canLaunchUrl(uri)) {
                    await launchUrl(uri, mode: LaunchMode.externalApplication);
                  }
                },
                style: ElevatedButton.styleFrom(
                  backgroundColor: Theme.of(context).primaryColor,
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(10)),
                ),
                child: const Text('دانلود و نصب',
                    style: TextStyle(color: Colors.white)),
              ),
            ],
          ),
        );
      },
    );
  }
}