// Author: fruit.com.cn

import 'package:flutter/material.dart';

import '../../../core/data/models/watch_record.dart';
import '../../../core/theme/app_colors.dart';
import '../../../core/theme/app_dimens.dart';
import '../../../core/widgets/remote_image.dart';
import '../../../l10n/app_localizations.dart';

/// 追剧页「继续观看」大横幅：取最近一条观看记录，点击续播。
class ContinueWatchingBanner extends StatelessWidget {
  const ContinueWatchingBanner({
    super.key,
    required this.record,
    required this.languageCode,
    required this.onTap,
  });

  final WatchRecord record;
  final String languageCode;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final episode = record.episodeNumber;
    final total =
        record.progress.totalEpisodes ?? record.drama?.episodeCount ?? 0;
    final title = record.localizedDisplayTitle(languageCode);
    final showMeta = episode > 0 && total > 0;

    return SizedBox(
      height: AppDimens.followingBannerHeight,
      child: ClipRRect(
        borderRadius: BorderRadius.circular(AppDimens.followingBannerRadius),
        child: Stack(
          fit: StackFit.expand,
          children: [
            RemoteImage(
              record.displayLandscapeCover,
              fit: BoxFit.cover,
              fallbackColor: AppColors.contentSurface,
            ),
            const DecoratedBox(
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  begin: Alignment.centerLeft,
                  end: Alignment.centerRight,
                  colors: [
                    Color(0x80000000),
                    Color(0x33000000),
                    Color(0x00000000),
                  ],
                  stops: [0, 0.45, 1],
                ),
              ),
            ),
            Material(
              type: MaterialType.transparency,
              child: InkWell(
                key: const Key('following-continue-banner'),
                onTap: onTap,
                child: Padding(
                  padding: const EdgeInsets.all(
                    AppDimens.followingBannerInnerGap,
                  ),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Expanded(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            if (title.isNotEmpty)
                              Text(
                                title,
                                maxLines: 1,
                                overflow: TextOverflow.ellipsis,
                                style: const TextStyle(
                                  color: AppColors.bannerTitleWarm,
                                  fontSize: AppDimens.followingBannerTitleFont,
                                  fontWeight: FontWeight.w400,
                                ),
                              ),
                            if (showMeta) ...[
                              const SizedBox(
                                height: AppDimens.followingBannerMetaGap,
                              ),
                              Text(
                                l10n.continueWatchingSubtitle(episode, total),
                                maxLines: 1,
                                style: const TextStyle(
                                  color: Color(0xB3F5EFE4),
                                  fontSize:
                                      AppDimens.followingBannerSubtitleFont,
                                ),
                              ),
                            ],
                            const SizedBox(
                              height: AppDimens.followingBannerButtonTopGap,
                            ),
                            _ContinueButton(label: l10n.continueWatching),
                          ],
                        ),
                      ),
                      const SizedBox(height: 10),
                      SizedBox(
                        width: double.infinity,
                        child: _ProgressBar(fraction: record.progress.fraction),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class _ContinueButton extends StatelessWidget {
  const _ContinueButton({required this.label});

  final String label;

  @override
  Widget build(BuildContext context) {
    return DecoratedBox(
      decoration: BoxDecoration(
        color: AppColors.brandRed,
        borderRadius: BorderRadius.circular(
          AppDimens.followingBannerButtonRadius,
        ),
      ),
      child: SizedBox(
        height: AppDimens.followingBannerButtonHeight,
        child: Padding(
          padding: const EdgeInsets.symmetric(
            horizontal: AppDimens.followingBannerButtonHorizontalPadding,
          ),
          child: Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              const Icon(
                Icons.play_arrow_rounded,
                size: AppDimens.followingBannerButtonIcon,
                color: AppColors.onPrimary,
              ),
              const SizedBox(width: AppDimens.followingBannerButtonGap),
              Text(
                label,
                style: const TextStyle(
                  color: AppColors.onPrimary,
                  fontSize: AppDimens.followingBannerButtonFont,
                  fontWeight: FontWeight.w400,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _ProgressBar extends StatelessWidget {
  const _ProgressBar({required this.fraction});

  final double fraction;

  @override
  Widget build(BuildContext context) {
    // SizedBox 给紧约束让 DecoratedBox 轨道撑满整宽；
    // 不能用无子 ColoredBox 直接放 Stack（会缩成 0×0 隐形）。
    return ClipRRect(
      borderRadius: BorderRadius.circular(
        AppDimens.followingBannerProgressHeight,
      ),
      child: SizedBox(
        height: AppDimens.followingBannerProgressHeight,
        width: double.infinity,
        child: DecoratedBox(
          decoration: const BoxDecoration(color: Color(0x66FFFFFF)),
          child: Align(
            alignment: Alignment.centerLeft,
            child: FractionallySizedBox(
              widthFactor: fraction.clamp(0.0, 1.0).toDouble(),
              // 无 child 的 ColoredBox 在松约束下会缩成 0×0，高度必须显式占满。
              heightFactor: 1.0,
              child: const ColoredBox(color: AppColors.brandRed),
            ),
          ),
        ),
      ),
    );
  }
}