// Author: fruit.com.cn
// 榜单统一行：名次角标压在封面左上角，右侧字段无数据不展示。

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/widgets/remote_image.dart';
import '../../../l10n/app_localizations.dart';

const double _badgeSize = 24;
const double _badgeCornerRadius = 10;
const double _badgeFontSize = 14;
const double _titleFontSize = 16;
const double _metaLineGap = 2;
const double _lineHeight = 1.25;
const int _synopsisMaxLines = 3;
const double _metaFontSize = 12;
const double _tagFontSize = 10;
const double _flameSize = 13;
const double _flameGap = 2;
const double _badgeMutedAlpha = 0.6;
const double _badgeTextHeight = 1;

/// 榜单行：左侧 3:4 封面带名次角标，右侧标题/分类/简介/底行元信息。
class RankingDramaRow extends StatelessWidget {
  const RankingDramaRow({
    super.key,
    required this.rank,
    required this.drama,
    required this.onTap,
  });

  final int rank;
  final Drama drama;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    return SizedBox(
      height: AppDimens.rankingCardCoverHeight,
      child: Material(
        color: AppColors.transparent,
        child: InkWell(
          key: Key('ranking-row-${rank - 1}'),
          onTap: onTap,
          child: Row(
            children: [
              _cover(),
              const SizedBox(width: AppDimens.spaceMd),
              Expanded(child: _info(l10n)),
            ],
          ),
        ),
      ),
    );
  }

  String get _category {
    final values = <String>{};
    for (final value in [drama.genre, drama.category]) {
      for (final part in value.split(RegExp(r'[,/、·]'))) {
        final tag = part.trim();
        if (tag.isNotEmpty) values.add(tag);
      }
    }
    return values.join(' · ');
  }

  Color get _badgeColor => switch (rank) {
    1 => AppColors.brandRed,
    2 => AppColors.homeCrownGold,
    3 => AppColors.bronze,
    _ => AppColors.ink.withValues(alpha: _badgeMutedAlpha),
  };

  Widget _badge() {
    return Container(
      key: Key('ranking-top-$rank'),
      width: _badgeSize,
      height: _badgeSize,
      alignment: Alignment.center,
      decoration: BoxDecoration(
        color: _badgeColor,
        borderRadius: const BorderRadius.only(
          topLeft: Radius.circular(AppDimens.rankingCoverRadius),
          bottomRight: Radius.circular(_badgeCornerRadius),
        ),
      ),
      child: Text(
        '$rank',
        maxLines: 1,
        style: const TextStyle(
          color: AppColors.textPrimary,
          fontSize: _badgeFontSize,
          fontWeight: FontWeight.w700,
          height: _badgeTextHeight,
        ),
      ),
    );
  }

  Widget _cover() {
    return ClipRRect(
      borderRadius: BorderRadius.circular(AppDimens.rankingCoverRadius),
      child: SizedBox(
        key: Key('ranking-row-cover-$rank'),
        width: AppDimens.rankingCardCoverWidth,
        height: AppDimens.rankingCardCoverHeight,
        child: Stack(
          fit: StackFit.expand,
          children: [
            RemoteImage(
              drama.posterUrl,
              fit: BoxFit.cover,
              fallbackWidget: const ColoredBox(color: AppColors.raised),
            ),
            Positioned(top: 0, left: 0, child: _badge()),
          ],
        ),
      ),
    );
  }

  Widget _info(AppLocalizations l10n) {
    final category = _category;
    final synopsis = drama.synopsis.trim();
    return SizedBox(
      height: AppDimens.rankingCardCoverHeight,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            drama.title,
            key: Key('ranking-title-$rank'),
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
            style: const TextStyle(
              color: AppColors.textPrimary,
              fontSize: _titleFontSize,
              fontWeight: FontWeight.w600,
              height: _lineHeight,
            ),
          ),
          if (category.isNotEmpty) _metaText(category),
          if (synopsis.isNotEmpty)
            _metaText(synopsis, maxLines: _synopsisMaxLines),
          const SizedBox(height: _metaLineGap),
          _bottomMeta(l10n),
        ],
      ),
    );
  }

  Widget _metaText(String text, {int maxLines = 1}) {
    return Padding(
      padding: const EdgeInsets.only(top: _metaLineGap),
      child: Text(
        text,
        maxLines: maxLines,
        overflow: TextOverflow.ellipsis,
        style: const TextStyle(
          color: AppColors.textTertiary,
          fontSize: _metaFontSize,
          height: _lineHeight,
        ),
      ),
    );
  }

  Widget _bottomMeta(AppLocalizations l10n) {
    final tag = drama.tag.trim();
    final metas = <String>[
      if (drama.viewCount > 0) l10n.heatLabel(formatPlayCount(drama.viewCount)),
      if (drama.likeCount != null)
        l10n.likesLabel(formatInteractionCount(drama.likeCount!)),
    ];
    if (tag.isEmpty && metas.isEmpty) return const SizedBox.shrink();
    return Wrap(
      crossAxisAlignment: WrapCrossAlignment.center,
      spacing: AppDimens.spaceSm,
      runSpacing: _metaLineGap,
      children: [
        if (tag.isNotEmpty) _tagText(tag),
        if (metas.isNotEmpty)
          Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              const Icon(
                Icons.local_fire_department_rounded,
                color: AppColors.actionRed,
                size: _flameSize,
              ),
              const SizedBox(width: _flameGap),
              Flexible(
                child: Text(
                  metas.join(' · '),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: const TextStyle(
                    color: AppColors.textTertiary,
                    fontSize: _metaFontSize,
                    height: _lineHeight,
                  ),
                ),
              ),
            ],
          ),
      ],
    );
  }

  Widget _tagText(String tag) {
    return Text(
      tag,
      key: Key('ranking-tag-$rank'),
      maxLines: 1,
      style: TextStyle(
        color: drama.tagRibbonColor(AppColors.brandRed),
        fontSize: _tagFontSize,
        fontWeight: FontWeight.w600,
        height: _lineHeight,
      ),
    );
  }
}