// Author: fruit.com.cn

import 'package:flutter/material.dart';

import '../../../core/data/models/drama.dart';
import '../../../core/formatting/count_format.dart';
import '../../../core/theme/app_colors.dart';
import '../../../core/theme/app_dimens.dart';
import '../../../core/theme/app_theme.dart';
import '../../../core/widgets/remote_image.dart';
import '../../../l10n/app_localizations.dart';

const int _columns = 2;
const double _columnGap = 10;
const double _cardGap = 10;
const double _coverAspectRatio = 5 / 6;
const double _cardPadding = 8;
const double _coverTitleGap = 6;
const double _lineGap = 2;
const double _viewsIconSize = 10;
const double _viewsFontSize = 9;

/// 首页浏览态使用的双列剧目网格。
class HomeDramaGrid extends StatelessWidget {
  const HomeDramaGrid({
    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-popular-grid'),
      padding: const EdgeInsets.symmetric(horizontal: AppDimens.pageHorizontal),
      child: Row(
        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(
        HomeDramaCard(l10n: l10n, drama: drama, onTap: () => onOpen(drama)),
      );
      if (index + _columns < dramas.length) {
        children.add(const SizedBox(height: _cardGap));
      }
    }
    return Column(children: children);
  }
}

/// 首页剧卡：封面、角标、标题、题材、集数与热度。
class HomeDramaCard extends StatelessWidget {
  const HomeDramaCard({
    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: AppColors.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(_cardPadding),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _cover(),
                const SizedBox(height: _coverTitleGap),
                _title(context),
                const SizedBox(height: _lineGap),
                _genre(context),
                const SizedBox(height: _lineGap),
                _metadata(),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _cover() {
    return ClipRRect(
      key: Key('home-drama-cover-${drama.id}'),
      borderRadius: BorderRadius.circular(AppDimens.coverRadius),
      child: Stack(
        children: [
          RemoteImage(
            drama.posterUrl,
            width: double.infinity,
            fit: BoxFit.fitWidth,
            fallbackAspectRatio: _coverAspectRatio,
          ),
          Positioned(top: 8, left: 8, child: _tagBadge()),
          Positioned(left: 8, bottom: 8, child: _viewsBadge()),
          Positioned(right: 8, bottom: 8, child: _episodeBadge()),
        ],
      ),
    );
  }

  bool get _isFree {
    return drama.freeEpisodes > 0 ||
        drama.episodes.any((episode) => episode.isFree);
  }

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

  Widget _episodeBadge() {
    return Container(
      key: Key('home-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,
        ),
      ),
    );
  }

  /// 播放次数角标：深色半透明胶囊 + 白色小播放图标。
  Widget _viewsBadge() {
    return Container(
      key: Key('home-drama-views-${drama.id}'),
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      decoration: BoxDecoration(
        color: AppColors.playerOverlayPill,
        borderRadius: BorderRadius.circular(AppDimens.pillRadius),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          const Icon(
            Icons.play_arrow_rounded,
            color: AppColors.onPrimary,
            size: _viewsIconSize,
          ),
          const SizedBox(width: 2),
          Text(
            formatInteractionCount(drama.viewCount),
            style: const TextStyle(
              color: AppColors.onPrimary,
              fontSize: _viewsFontSize,
              fontWeight: FontWeight.w700,
            ),
          ),
        ],
      ),
    );
  }

  Widget _title(BuildContext context) {
    return Text(
      drama.localizedTitle(Localizations.localeOf(context).languageCode),
      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(BuildContext context) {
    final labels = drama.localizedTypeLabels(
      Localizations.localeOf(context).languageCode,
    );
    final genre = labels.isEmpty
        ? (drama.genre.isEmpty ? drama.category : drama.genre)
        : labels.join(' / ');
    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 _metadata() {
    return Text(
      l10n.episodeCount(drama.episodeCount),
      key: Key('home-drama-episode-count-${drama.id}'),
      style: const TextStyle(
        color: AppColors.subtle,
        fontSize: AppDimens.cardViews,
      ),
    );
  }
}