import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:xtremobile/core/models/playlist_config.dart';
import 'package:xtremobile/mobile/providers/mobile_xtream_providers.dart';
import 'package:xtremobile/mobile/providers/mobile_settings_providers.dart';
import 'package:xtremobile/features/iptv/screens/native_player_screen.dart';
import 'package:xtremobile/core/theme/app_colors.dart';
import 'package:xtremobile/core/utils/image_cache_config.dart';
import 'package:xtremobile/core/models/iptv_models.dart' as model;

class MobileSeriesDetailScreen extends ConsumerStatefulWidget {
  final model.Series series;
  final PlaylistConfig playlist;

  const MobileSeriesDetailScreen({
    super.key,
    required this.series,
    required this.playlist,
  });

  @override
  ConsumerState<MobileSeriesDetailScreen> createState() =>
      _MobileSeriesDetailScreenState();
}

class _MobileSeriesDetailScreenState
    extends ConsumerState<MobileSeriesDetailScreen> {
  model.SeriesInfo? _seriesInfo;
  bool _isLoading = true;
  String? _error;
  String _selectedSeason = "1";

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

  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;
  }

  Future<void> _loadSeriesInfo() async {
    try {
      setState(() {
        _isLoading = true;
        _error = null;
      });

      final service =
          await ref.read(mobileXtreamServiceProvider(widget.playlist).future);
      final info =
          await service.getSeriesInfo(widget.series.seriesId.toString());

      if (mounted) {
        setState(() {
          _seriesInfo = info;
          _isLoading = false;
          if (_seriesInfo!.episodes.isNotEmpty) {
            _selectedSeason = _seriesInfo!.episodes.keys.first.toString();
          }
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() {
          _error = e.toString();
          _isLoading = false;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.background,
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : _error != null
              ? Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      const Icon(
                        Icons.error_outline,
                        size: 48,
                        color: AppColors.error,
                      ),
                      const SizedBox(height: 16),
                      Text(
                        'Error: $_error',
                        style: const TextStyle(color: AppColors.textSecondary),
                      ),
                      TextButton(
                        onPressed: _loadSeriesInfo,
                        child: const Text('Retry'),
                      ),
                    ],
                  ),
                )
              : _buildMobileContent(),
    );
  }

  Widget _buildMobileContent() {
    if (_seriesInfo == null) return const SizedBox.shrink();

    final currentEpisodes = _seriesInfo!.episodes[_selectedSeason] ?? [];

    return CustomScrollView(
      slivers: [
        // App Bar with Cover
        SliverAppBar(
          expandedHeight: 280, // Reduced from 400 for better TV visibility
          pinned: true,
          backgroundColor: AppColors.background,
          leading: Container(
            margin: const EdgeInsets.all(8),
            decoration: const BoxDecoration(
              color: Colors.black45,
              shape: BoxShape.circle,
            ),
            child: IconButton(
              icon: const Icon(Icons.arrow_back, color: AppColors.onSurface),
              onPressed: () => Navigator.pop(context),
              tooltip: 'Back',
            ),
          ),
          flexibleSpace: FlexibleSpaceBar(
            background: Stack(
              fit: StackFit.expand,
              children: [
                if (_seriesInfo!.coverUrl != null)
                  // [P1-2 FIX] Optimize series cover image cache (400x600 display)
                  CachedNetworkImage(
                    imageUrl: _seriesInfo!.coverUrl!,
                    fit: BoxFit.cover,
                    memCacheWidth: 480,
                    memCacheHeight: 720,
                    maxWidthDiskCache: 480,
                    maxHeightDiskCache: 720,
                    cacheManager: AppCacheManager.instance,
                    errorWidget: (_, __, ___) =>
                        Container(color: AppColors.surfaceContainerLowest),
                  ),
                // Gradient Overlay
                Container(
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topCenter,
                      end: Alignment.bottomCenter,
                      colors: [
                        Colors.transparent,
                        AppColors.background.withOpacity(0.8),
                        AppColors.background,
                      ],
                      stops: const [0.5, 0.8, 1.0],
                    ),
                  ),
                ),
                // Info Overlay
                Positioned(
                  bottom: 16,
                  left: 16,
                  right: 16,
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Text(
                        _seriesInfo!.title,
                        style: GoogleFonts.inter(
                          fontSize: 24,
                          fontWeight: FontWeight.bold,
                          color: AppColors.textPrimary,
                        ),
                      ),
                      const SizedBox(height: 8),
                      Row(
                        children: [
                          if (_seriesInfo!.rating != null) ...[
                            const Icon(
                              Icons.star,
                              size: 16,
                              color: AppColors.ratingGold,
                            ),
                            const SizedBox(width: 4),
                            Text(
                              _formatRating(_seriesInfo!.rating!)!,
                              style: const TextStyle(
                                color: AppColors.textSecondary,
                                fontSize: 13,
                              ),
                            ),
                            const SizedBox(width: 16),
                          ],
                          Text(
                            '${_seriesInfo!.episodes.keys.length} Saisons',
                            style: const TextStyle(
                              color: AppColors.textSecondary,
                              fontSize: 13,
                            ),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),

        // Plot
        if (_seriesInfo!.plot != null && _seriesInfo!.plot!.isNotEmpty)
          SliverToBoxAdapter(
            child: Padding(
              padding: const EdgeInsets.all(16.0),
              child: Text(
                _seriesInfo?.plot ?? '',
                style: const TextStyle(
                  color: AppColors.textSecondary,
                  height: 1.4,
                ),
                maxLines: 4,
                overflow: TextOverflow.ellipsis,
              ),
            ),
          ),

        // Seasons Filter
        SliverToBoxAdapter(
          child: SizedBox(
            height: 50,
            child: Builder(
              builder: (context) {
                final isDark = Theme.of(context).brightness == Brightness.dark;
                return ListView.separated(
                  padding: const EdgeInsets.symmetric(horizontal: 16),
                  scrollDirection: Axis.horizontal,
                  itemCount: _seriesInfo!.episodes.keys.length,
                  separatorBuilder: (_, __) => const SizedBox(width: 8),
                  itemBuilder: (context, index) {
                    final seasonNum =
                        _seriesInfo!.episodes.keys.elementAt(index);
                    final isSelected = seasonNum == _selectedSeason;
                    return ChoiceChip(
                      label: Text('Saison $seasonNum'),
                      selected: isSelected,
                      onSelected: (selected) {
                        if (selected) {
                          setState(() => _selectedSeason = seasonNum.toString());
                        }
                      },
                      backgroundColor: isDark
                          ? AppColors.surfaceContainer
                          : AppColors.surfaceContainerHigh,
                      selectedColor: isDark ? AppColors.onSurface : AppColors.primaryFill,
                      labelStyle: TextStyle(
                        color: isSelected
                            ? (isDark ? AppColors.onPrimaryFixed : AppColors.onSurface)
                            : (isDark
                                ? AppColors.textSecondary
                                : AppColors.outlineVariant),
                        fontWeight:
                            isSelected ? FontWeight.w600 : FontWeight.w400,
                      ),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(20),
                      ),
                      showCheckmark: false,
                      side: BorderSide.none,
                    );
                  },
                );
              },
            ),
          ),
        ),

        const SliverToBoxAdapter(child: SizedBox(height: 16)),

        // Episodes List
        SliverPadding(
          padding: const EdgeInsets.only(bottom: 32),
          sliver: SliverList(
            delegate: SliverChildBuilderDelegate(
              (context, index) {
                final episode = currentEpisodes[index];
                return _buildEpisodeTile(episode);
              },
              childCount: currentEpisodes.length,
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildEpisodeTile(model.Episode episode) {
    final watchHistory = ref.watch(mobileWatchHistoryProvider);
    final episodeKey = MobileWatchHistory.episodeKey(
      widget.series.seriesId,
      int.tryParse(_selectedSeason) ?? 1,
      episode.episodeNum,
    );
    final isWatched = watchHistory.isEpisodeWatched(episodeKey);
    final resumePos = watchHistory.getResumePosition(episodeKey);

    // Calculate progress
    double progress = 0.0;
    if (episode.duration > 0 &&
        resumePos > 0) {
      progress = (resumePos / episode.duration).clamp(0.0, 1.0);
    }

    // Force dark mode colors since background is hardcoded dark
    const textColor = AppColors.onSurface;
    final secondaryTextColor = AppColors.textSecondary;
    const surfaceColor = AppColors.surfaceContainer;
    const primaryColor = AppColors.onSurface; // Or accent color if preferred

    return InkWell(
      onTap: () {
        // Enforce Native Player for Series (VOD)
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => NativePlayerScreen(
              streamId: episode.id,
              title:
                  "${widget.series.name} S${episode.season}E${episode.episodeNum}",
              playlist: widget.playlist,
              streamType: model.StreamType.series,
              containerExtension: episode.containerExtension,
              seriesId: widget.series.seriesId,
              season: int.tryParse(episode.season.toString()),
              episodeNum: episode.episodeNum,
              // Pass explicit initial position for resume
              initialPosition:
                  resumePos > 0 ? Duration(seconds: resumePos) : null,
            ),
          ),
        );
      },
      child: Column(
        children: [
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
            decoration: const BoxDecoration(
              border: Border(bottom: BorderSide(color: AppColors.onSurface12)),
            ),
            child: Row(
              children: [
                // Play Button / Indicator
                Container(
                  width: 40,
                  height: 40,
                  decoration: BoxDecoration(
                    color: isWatched ? primaryColor : surfaceColor,
                    shape: BoxShape.circle,
                    border: isWatched
                        ? null
                        : Border.all(color: primaryColor, width: 2),
                  ),
                  child: Icon(
                    isWatched ? Icons.check : Icons.play_arrow,
                    color: isWatched
                        ? AppColors.onPrimaryFixed // Checkmark on white bg
                        : primaryColor, // Play icon
                    size: 20,
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'E${episode.episodeNum} - ${episode.title}',
                        style: TextStyle(
                          color: isWatched ? secondaryTextColor : textColor,
                          fontWeight: FontWeight.w600,
                          fontSize: 14,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                      if (episode.duration > 0)
                        Text(
                          _formatDuration(episode.duration),
                          style: TextStyle(
                            color: secondaryTextColor,
                            fontSize: 12,
                          ),
                        ),
                    ],
                  ),
                ),
              ],
            ),
          ),
          // Progress Bar (Red like YouTube/Netflix)
          if (progress > 0 && !isWatched)
            LinearProgressIndicator(
              value: progress,
              backgroundColor: Colors.transparent,
              valueColor: const AlwaysStoppedAnimation<Color>(AppColors.error),
              minHeight: 2,
            ),
        ],
      ),
    );
  }

  String _formatDuration(int seconds) {
    final hours = seconds ~/ 3600;
    final minutes = (seconds % 3600) ~/ 60;
    if (hours > 0) return '${hours}h ${minutes}m';
    return '${minutes}m';
  }
}