// Author: fruit.com.cn

import 'package:flutter/material.dart';

import '../../../core/config/app_config.dart';
import '../../../core/data/models/drama.dart';
import '../../../core/theme/app_colors.dart';
import '../../../core/theme/app_dimens.dart';
import '../../../core/theme/app_theme.dart';
import '../../../l10n/app_localizations.dart';

const int _columns = 2;
const double _columnGap = 10;
const double _cardGap = 10;
const double _addSize = 28;
const double _addIconSize = 18;

/// 剧场/分类页共用的双列剧目网格。
class DramaGrid extends StatelessWidget {
  const DramaGrid({
    super.key,
    required this.l10n,
    required this.dramas,
    required this.onOpen,
  });

  final AppLocalizations l10n;
  final List<Drama> dramas;
  final ValueChanged<Drama> onOpen;

  @override
  Widget build(BuildContext context) {
    return Padding(
      key: const Key('home-all-dramas-section'),
      padding: const EdgeInsets.symmetric(horizontal: 14),
      child: Row(
        key: const Key('home-all-dramas-grid'),
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Expanded(child: _column(0)),
          const SizedBox(width: _columnGap),
          Expanded(child: _column(1)),
        ],
      ),
    );
  }

  Widget _column(int start) {
    final children = <Widget>[];
    for (var index = start; index < dramas.length; index += _columns) {
      final drama = dramas[index];
      children.add(
        DramaGridCard(l10n: l10n, drama: drama, onTap: () => onOpen(drama)),
      );
      if (index + _columns < dramas.length) {
        children.add(const SizedBox(height: _cardGap));
      }
    }
    return Column(children: children);
  }
}

/// 双列网格中的剧目卡片。
class DramaGridCard extends StatelessWidget {
  const DramaGridCard({
    super.key,
    required this.l10n,
    required this.drama,
    required this.onTap,
  });

  final AppLocalizations l10n;
  final Drama drama;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: AppColors.card,
        borderRadius: BorderRadius.circular(AppDimens.cardRadius),
        boxShadow: const [AppTheme.cardShadow],
      ),
      child: Material(
        color: Colors.transparent,
        borderRadius: BorderRadius.circular(AppDimens.cardRadius),
        clipBehavior: Clip.antiAlias,
        child: InkWell(
          key: Key('home-drama-card-${drama.id}'),
          onTap: onTap,
          child: Padding(
            padding: const EdgeInsets.all(AppDimens.spaceSm),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _cover(),
                const SizedBox(height: AppDimens.spaceSm),
                _title(),
                const SizedBox(height: AppDimens.spaceXs),
                _footer(),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _cover() {
    final free =
        drama.freeEpisodes > 0 ||
        drama.episodes.any((episode) => episode.isFree);
    return ClipRRect(
      key: Key('home-drama-cover-${drama.id}'),
      borderRadius: BorderRadius.circular(AppDimens.coverRadius),
      child: Stack(
        children: [
          _DiscoverCoverImage(path: drama.posterUrl),
          Positioned(top: 8, left: 8, child: _tagBadge(free)),
          if (_lockedCount > 0)
            Positioned(top: 8, right: 8, child: _lockedBadge()),
          Positioned(right: 8, bottom: 8, child: _episodeBadge()),
        ],
      ),
    );
  }

  int get _lockedCount {
    final explicit = drama.episodes.where((episode) => episode.locked).length;
    if (explicit > 0) return explicit;
    final inferred = drama.episodeCount - drama.freeEpisodes;
    return inferred > 0 ? inferred : 0;
  }

  Widget _tagBadge(bool free) {
    return Container(
      key: Key('drama-tag-${drama.id}'),
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: AppColors.badgePink,
        borderRadius: BorderRadius.circular(AppDimens.pillRadius),
      ),
      child: Text(
        free ? l10n.free : l10n.originalTag,
        style: const TextStyle(
          color: AppColors.badgePinkText,
          fontSize: AppDimens.cardMeta,
          fontWeight: FontWeight.w800,
        ),
      ),
    );
  }

  Widget _lockedBadge() {
    return Container(
      key: Key('drama-locked-${drama.id}'),
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 3),
      decoration: BoxDecoration(
        color: AppColors.overlayDark,
        borderRadius: BorderRadius.circular(AppDimens.pillRadius),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          const Icon(Icons.lock_rounded, color: AppColors.onPrimary, size: 11),
          const SizedBox(width: 2),
          Text(
            l10n.lockedEpisodeCount(_lockedCount),
            style: const TextStyle(
              color: AppColors.onPrimary,
              fontSize: 9,
              fontWeight: FontWeight.w700,
            ),
          ),
        ],
      ),
    );
  }

  Widget _episodeBadge() {
    return Container(
      key: Key('drama-episodes-badge-${drama.id}'),
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: AppColors.badgeBeige,
        borderRadius: BorderRadius.circular(AppDimens.pillRadius),
      ),
      child: Text(
        l10n.allEpisodesBadge(drama.episodeCount),
        style: const TextStyle(
          color: AppColors.onSurface,
          fontSize: 9,
          fontWeight: FontWeight.w700,
        ),
      ),
    );
  }

  Widget _title() {
    return Text(
      drama.title,
      key: Key('home-drama-title-${drama.id}'),
      maxLines: 1,
      overflow: TextOverflow.ellipsis,
      style: const TextStyle(
        color: AppColors.onSurface,
        fontSize: AppDimens.cardTitle,
        fontWeight: FontWeight.w800,
      ),
    );
  }

  Widget _genre() {
    final genre = drama.genre.isEmpty ? drama.category : drama.genre;
    return Text(
      genre.isEmpty ? l10n.videoPending : genre,
      key: Key('home-drama-genre-${drama.id}'),
      maxLines: 1,
      overflow: TextOverflow.ellipsis,
      style: const TextStyle(
        color: AppColors.muted,
        fontSize: AppDimens.cardMeta,
      ),
    );
  }

  Widget _footer() {
    return Row(
      children: [
        Expanded(child: _genre()),
        Container(
          key: Key('drama-add-${drama.id}'),
          width: _addSize,
          height: _addSize,
          decoration: const BoxDecoration(
            color: AppColors.blue,
            shape: BoxShape.circle,
          ),
          child: const Icon(
            Icons.add_rounded,
            color: AppColors.onPrimary,
            size: _addIconSize,
          ),
        ),
      ],
    );
  }
}

class _DiscoverCoverImage extends StatelessWidget {
  const _DiscoverCoverImage({required this.path});

  final String path;

  @override
  Widget build(BuildContext context) {
    final url = AppConfig.mediaUrl(path);
    if (url.isEmpty) return _placeholder();
    return Image.network(
      url,
      width: double.infinity,
      fit: BoxFit.fitWidth,
      loadingBuilder: (context, child, progress) {
        if (progress == null) return child;
        return _placeholder();
      },
      errorBuilder: (_, _, _) => _placeholder(),
    );
  }

  Widget _placeholder() {
    return AspectRatio(
      aspectRatio: 3 / 4,
      child: ColoredBox(
        color: AppColors.card,
        child: const Center(
          child: Icon(
            Icons.image_not_supported_outlined,
            color: AppColors.muted,
            size: 32,
          ),
        ),
      ),
    );
  }
}