import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:xtremobile/mobile/widgets/tv_focusable.dart';
import 'package:xtremobile/mobile/widgets/mobile_poster_card.dart';
import 'package:xtremobile/mobile/widgets/mobile_category_card.dart';
import 'package:xtremobile/core/models/playlist_config.dart';
import 'package:xtremobile/core/theme/app_decorations.dart';
import 'package:xtremobile/mobile/providers/mobile_settings_providers.dart';
import 'package:xtremobile/mobile/providers/mobile_xtream_providers.dart';
import 'package:xtremobile/core/models/iptv_models.dart' as model;
import 'package:xtremobile/features/iptv/screens/mobile_series_detail_screen.dart';

class MobileSeriesTab extends ConsumerStatefulWidget {
  final PlaylistConfig playlist;
  const MobileSeriesTab({super.key, required this.playlist});

  @override
  ConsumerState<MobileSeriesTab> createState() => _MobileSeriesTabState();
}

class _MobileSeriesTabState extends ConsumerState<MobileSeriesTab>
    with AutomaticKeepAliveClientMixin {
  final ScrollController _scrollController = ScrollController();
  final TextEditingController _searchController = TextEditingController();
  final FocusNode _searchFocusNode = FocusNode();

  // Data
  List<MapEntry<String, String>> _categories = [];
  List<model.Series> _categorySeries = [];
  String? _selectedCategoryId;
  String? _selectedCategoryName;

  // Search
  List<model.Series>? _searchResults;
  String _searchQuery = '';
  bool _isSearchEditing = false;
  bool _isSearching = false;
  Timer? _searchDebounce;

  // State
  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (mounted && _categories.isEmpty) {
        _loadCategories();
      }
    });
  }

  @override
  void dispose() {
    _scrollController.dispose();
    _searchController.dispose();
    _searchFocusNode.dispose();
    _searchDebounce?.cancel();
    super.dispose();
  }

  void _onSearchChanged(String query) {
    _searchDebounce?.cancel();
    setState(() {
      _searchQuery = query;
      if (query.isEmpty) {
        _searchResults = null;
        _isSearching = false;
      }
    });

    if (query.length >= 2) {
      _searchDebounce = Timer(const Duration(milliseconds: 500), () {
        _performSearch(query);
      });
    }
  }

  Future<void> _performSearch(String query) async {
    if (query.isEmpty) return;
    setState(() => _isSearching = true);

    try {
      final service =
          await ref.read(mobileXtreamServiceProvider(widget.playlist).future);
      final results = await service.searchSeries(query);

      if (mounted && _searchQuery == query) {
        setState(() {
          _searchResults = results;
          _isSearching = false;
        });
      }
    } catch (e) {
      if (mounted) setState(() => _isSearching = false);
    }
  }

  Future<void> _loadCategories() async {
    if (_isLoading || !mounted) return;
    setState(() => _isLoading = true);

    try {
      final service =
          await ref.read(mobileXtreamServiceProvider(widget.playlist).future);
      final categories = await service.getSeriesCategories();

      if (mounted) {
        setState(() {
          _categories = categories
              .map((c) => MapEntry(c.categoryId, c.categoryName))
              .toList()
            ..sort((a, b) => a.value.compareTo(b.value));
          _isLoading = false;
        });
      }
    } catch (e) {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  Future<void> _selectCategory(String id, String name) async {
    setState(() {
      _selectedCategoryId = id;
      _selectedCategoryName = name;
      _categorySeries = [];
      _isLoading = true;
    });

    try {
      final service =
          await ref.read(mobileXtreamServiceProvider(widget.playlist).future);
      final series = await service.getSeriesPaginated(categoryId: id);

      if (mounted) {
        setState(() {
          _categorySeries = series;
          _isLoading = false;
        });
      }
    } catch (e) {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  void _onBack() {
    if (_searchQuery.isNotEmpty) {
      _onSearchChanged('');
      _searchController.clear();
      setState(() => _isSearchEditing = false);
      return;
    }

    if (_selectedCategoryId != null) {
      setState(() {
        _selectedCategoryId = null;
        _selectedCategoryName = null;
        _categorySeries = [];
      });
      return;
    }
  }

  Future<void> _refresh() async {
    try {
      final service =
          await ref.read(mobileXtreamServiceProvider(widget.playlist).future);
      service.clearCache();
    } catch (_) {}

    setState(() {
      _categories.clear();
      _selectedCategoryId = null;
      _selectedCategoryName = null;
      _categorySeries.clear();
      _searchResults = null;
      _searchQuery = '';
      _searchController.clear();
      _isLoading = false;
    });
    await _loadCategories();
  }

  String? _formatRating(String? rating) {
    if (rating == null || rating.isEmpty) return null;
    final value = double.tryParse(rating);
    if (value != null) {
      return value.toStringAsFixed(1);
    }
    return rating;
  }

  String _getImageUrl(String? originalUrl) {
    if (originalUrl == null || originalUrl.isEmpty) return '';
    return originalUrl;
  }

  void _openSeries(model.Series series) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => MobileSeriesDetailScreen(
          series: series,
          playlist: widget.playlist,
        ),
      ),
    );
  }

  @override
  bool get wantKeepAlive => true;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    final settings = ref.watch(mobileSettingsProvider);

    if (_categories.isEmpty && !_isLoading) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (mounted && _categories.isEmpty) {
          _loadCategories();
        }
      });
    }

    final bool showingCategories =
        _searchQuery.isEmpty && _selectedCategoryId == null;
    final bool showingSeries =
        _searchQuery.isEmpty && _selectedCategoryId != null;
    final bool showingSearch = _searchQuery.isNotEmpty;

    final filteredCategories = _categories
        .where((entry) => settings.matchesSeriesFilter(entry.value))
        .toList();

    int itemCount = 0;
    if (showingCategories) {
      itemCount = filteredCategories.length;
    } else if (showingSeries) {
      itemCount = _categorySeries.length;
    } else if (showingSearch) {
      itemCount = _searchResults?.length ?? 0;
    }

    return Container(
      decoration: AppDecorations.background(context),
      child: PopScope(
        canPop: false,
        onPopInvokedWithResult: (didPop, _) async {
          if (didPop) return;

          // Only handle back if this tab is currently active (tab index 2)
          if (ref.read(mobileDashboardIndexProvider) != 2) return;

          if (_searchQuery.isNotEmpty || _isSearching) {
            _onSearchChanged('');
            _searchController.clear();
            setState(() => _isSearchEditing = false);
            return;
          }

          if (_selectedCategoryId != null) {
            _onBack();
            return;
          }

          final shouldExit = await showDialog<bool>(
            context: context,
            builder: (context) => AlertDialog(
              backgroundColor: Colors.grey[900],
              title: const Text("Quitter l'application", style: TextStyle(color: Colors.white)),
              content: const Text("Voulez-vous vraiment quitter l'application ?", style: TextStyle(color: Colors.white70)),
              actions: [
                TextButton(
                  onPressed: () => Navigator.of(context).pop(false),
                  autofocus: true,
                  child: const Text('Annuler', style: TextStyle(color: Colors.blueAccent)),
                ),
                TextButton(
                  onPressed: () => Navigator.of(context).pop(true),
                  child: const Text('Quitter', style: TextStyle(color: Colors.redAccent)),
                ),
              ],
            ),
          );

          if (shouldExit == true) {
            SystemNavigator.pop();
          }
        },
        child: SafeArea(
          bottom: false,
          child: RefreshIndicator(
            onRefresh: _refresh,
            child: CustomScrollView(
              physics: const AlwaysScrollableScrollPhysics(),
              slivers: [
                // Pinned Header
                SliverAppBar(
                  pinned: true,
                  floating: false,
                  snap: false,
                  backgroundColor: const Color(0xFF000000),
                  elevation: 0,
                  scrolledUnderElevation: 0,
                  automaticallyImplyLeading: false,
                  toolbarHeight: showingSeries ? 120.0 : 110.0,
                  flexibleSpace: FlexibleSpaceBar(
                    background: Container(
                      padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
                      child: Column(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          // Search Bar
                          TVFocusable(
                            scale: 1.0,
                            focusColor: Colors.white,
                            onPressed: () {
                              setState(() => _isSearchEditing = true);
                              WidgetsBinding.instance.addPostFrameCallback((_) {
                                _searchFocusNode.requestFocus();
                                SystemChannels.textInput.invokeMethod('TextInput.show');
                              });
                            },
                            borderRadius: BorderRadius.circular(12),
                            child: Container(
                              height: 48,
                              decoration: AppDecorations.searchBar(context),
                              padding: const EdgeInsets.symmetric(horizontal: 12),
                              child: Row(
                                children: [
                                  Icon(Icons.search, color: AppDecorations.textSecondary(context)),
                                  const SizedBox(width: 8),
                                  Expanded(
                                    child: ExcludeFocus(
                                      excluding: !_isSearchEditing,
                                      child: TextField(
                                        cursorColor: Colors.white,
                                        controller: _searchController,
                                        focusNode: _searchFocusNode,
                                        readOnly: !_isSearchEditing,
                                        style: TextStyle(color: AppDecorations.textPrimary(context)),
                                        decoration: InputDecoration(
                                          hintText: _selectedCategoryId != null ? 'Rechercher...' : 'Rechercher une série...',
                                          border: InputBorder.none,
                                          focusedBorder: InputBorder.none,
                                          enabledBorder: InputBorder.none,
                                          isDense: true,
                                        ),
                                        onChanged: _onSearchChanged,
                                        onSubmitted: (_) => setState(() => _isSearchEditing = false),
                                      ),
                                    ),
                                  ),
                                  if (_isSearching) const SizedBox(width: 16, height: 16, child: CircularProgressIndicator(strokeWidth: 2)),
                                  if (_searchQuery.isNotEmpty)
                                    GestureDetector(
                                      onTap: () { _searchController.clear(); _onSearchChanged(''); },
                                      child: Icon(Icons.close, color: AppDecorations.textSecondary(context)),
                                    ),
                                ],
                              ),
                            ),
                          ),

                          const SizedBox(height: 12),

                          // Navigation Row
                          Row(
                            children: [
                              if (showingSeries) ...[
                                IconButton(
                                  icon: Icon(Icons.arrow_back, color: AppDecorations.textPrimary(context)),
                                  onPressed: _onBack,
                                  padding: EdgeInsets.zero,
                                  constraints: const BoxConstraints(),
                                ),
                                const SizedBox(width: 12),
                              ],
                              Expanded(
                                child: Text(
                                  showingSeries
                                      ? (_selectedCategoryName ?? 'Séries')
                                      : showingSearch
                                          ? 'Résultats de recherche'
                                          : 'Catégories',
                                  style: TextStyle(
                                    color: AppDecorations.textPrimary(context),
                                    fontWeight: FontWeight.bold,
                                    fontSize: 18,
                                  ),
                                  overflow: TextOverflow.ellipsis,
                                ),
                              ),
                            ],
                          ),
                        ],
                      ),
                    ),
                  ),
                ),

                SliverPadding(
                  padding: const EdgeInsets.fromLTRB(16, 0, 16, 80),
                  sliver: SliverGrid(
                    gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                      crossAxisCount: showingCategories ? 6 : 8,
                      crossAxisSpacing: 10,
                      mainAxisSpacing: 10,
                      childAspectRatio: showingCategories ? 2.0 : 0.67,
                    ),
                    delegate: SliverChildBuilderDelegate(
                      (context, index) {
                        if (showingCategories) {
                          if (index >= filteredCategories.length) return null;
                          final cat = filteredCategories[index];
                          return MobileCategoryCard(
                            title: cat.value,
                            icon: Icons.video_library_rounded,
                            onTap: () => _selectCategory(cat.key, cat.value),
                          );
                        } else if (showingSeries) {
                          if (index >= _categorySeries.length) return null;
                          final series = _categorySeries[index];
                          return MobilePosterCard(
                            title: series.name,
                            imageUrl: _getImageUrl(series.cover),
                            rating: _formatRating(series.rating),
                            placeholderIcon: Icons.tv,
                            onTap: () => _openSeries(series),
                          );
                        } else if (showingSearch) {
                          if (_searchResults == null || index >= _searchResults!.length) return null;
                          final series = _searchResults![index];
                          return MobilePosterCard(
                            title: series.name,
                            imageUrl: _getImageUrl(series.cover),
                            rating: _formatRating(series.rating),
                            placeholderIcon: Icons.tv,
                            onTap: () => _openSeries(series),
                          );
                        }
                        return null;
                      },
                      childCount: itemCount,
                    ),
                  ),
                ),

                if (_isLoading)
                  const SliverToBoxAdapter(
                    child: Padding(
                      padding: EdgeInsets.all(24),
                      child: Center(child: CircularProgressIndicator()),
                    ),
                  ),
                
                if (!_isLoading && itemCount == 0 && (_selectedCategoryId != null || _searchQuery.isNotEmpty))
                  SliverToBoxAdapter(
                    child: Center(
                      child: Padding(
                        padding: const EdgeInsets.all(48),
                        child: Text('Aucune série trouvée', style: TextStyle(color: AppDecorations.textSecondary(context))),
                      ),
                    ),
                  ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}