skywood/lib/pages/home/players/page/drama_detail_page.dart

import 'package:flutter/material.dart';
import 'package:skywood/global/client/play_client.dart';
import 'package:skywood/main/lib_file.dart';
import 'package:skywood/pages/home/players/widget/sky_player_view.dart';
import 'package:skywood/utils/models/drama/skywood_detail.dart';
import 'package:skywood/utils/models/drama/skywood_drama.dart';
import 'package:skywood/utils/models/drama/skywood_episode.dart';
import 'package:skywood/utils/tools/app_toast.dart';
import 'package:skywood/utils/tools/widgets/sky_common_widget.dart';

class DramaDetailPage extends StatefulWidget {
  const DramaDetailPage({super.key, required this.dramaBean});

  final SkywoodDrama dramaBean;

  @override
  State<StatefulWidget> createState() {
    return _DramaDetailPageState();
  }
}

class _DramaDetailPageState extends State<DramaDetailPage> {
  static const int _preloadCount = 1;

  SkywoodDetail? _detailBean;
  SkywoodEpisode? _selectedEpisode;
  final PageController _pageController = PageController();
  int _currentPageIndex = 0;
  int? _requestingVideoId;

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

    _getDetailDrama(
      shortPlayId: widget.dramaBean.shortPlayId ?? 0,
      shortPlayVideoId: widget.dramaBean.shortPlayVideoId ?? 0,
    );
  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }

  void _getDetailDrama({
    required int shortPlayId,
    required int shortPlayVideoId,
    bool showLoading = true,
  }) {
    _requestingVideoId = shortPlayVideoId;
    if (showLoading) {
      AppToast.showLottieLoading();
    }
    PlayClient.getVideoDetail(
      shortPlayId: shortPlayId,
      shortPlayVideoId: shortPlayVideoId,
    ).then((value) {
      if (showLoading) {
        AppToast.dismiss();
      }
      if (!mounted) return;
      if (_requestingVideoId != shortPlayVideoId) return;
      setState(() {
        _detailBean = value;
        if (value != null) {
          _selectedEpisode ??= _resolveCurrentEpisode(value);
          _currentPageIndex = _indexOfEpisode(_selectedEpisode);
        }
      });
      _jumpToCurrentPage();
    });
  }

  void _onSelectedEpisode(SkywoodEpisode episode) {
    setState(() {
      _selectedEpisode = episode;
      _currentPageIndex = _indexOfEpisode(episode);
    });
    _jumpToCurrentPage();
    _getDetailDrama(
      shortPlayId: episode.shortPlayId,
      shortPlayVideoId: episode.shortPlayVideoId,
      showLoading: false,
    );
  }

  void _onPageChanged(int index) {
    final episodes = _detailBean?.episodeList ?? [];
    if (index < 0 || index >= episodes.length) return;

    final episode = episodes[index];
    if (_selectedEpisode?.shortPlayVideoId == episode.shortPlayVideoId) {
      _currentPageIndex = index;
      return;
    }

    setState(() {
      _selectedEpisode = episode;
      _currentPageIndex = index;
    });
    _getDetailDrama(
      shortPlayId: episode.shortPlayId,
      shortPlayVideoId: episode.shortPlayVideoId,
      showLoading: false,
    );
  }

  SkywoodEpisode? _resolveCurrentEpisode(SkywoodDetail detail) {
    if (detail.episodeList.isEmpty) return null;

    final int? episode =
        _selectedEpisode?.episode ??
        detail.videoInfo?.episode ??
        detail.videoInfo?.currentEpisode ??
        detail.shortPlayInfo?.episode ??
        detail.shortPlayInfo?.currentEpisode ??
        widget.dramaBean.currentEpisode ??
        widget.dramaBean.episode;

    if (episode != null && episode > 0) {
      for (final item in detail.episodeList) {
        if (item.episode == episode) return item;
      }
    }

    return detail.episodeList.first;
  }

  int _indexOfEpisode(SkywoodEpisode? episode) {
    final episodes = _detailBean?.episodeList ?? [];
    if (episode == null || episodes.isEmpty) return 0;

    final index = episodes.indexWhere(
      (item) => item.shortPlayVideoId == episode.shortPlayVideoId,
    );
    return index < 0 ? 0 : index;
  }

  void _jumpToCurrentPage() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (!mounted || !_pageController.hasClients) return;
      final episodes = _detailBean?.episodeList ?? [];
      if (episodes.isEmpty) return;
      final page = _currentPageIndex.clamp(0, episodes.length - 1);
      if ((_pageController.page ?? _pageController.initialPage).round() ==
          page) {
        return;
      }
      _pageController.jumpToPage(page);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(backgroundColor: Colors.black, body: _bodyWidget());
  }

  Widget _bodyWidget() {
    return Stack(
      children: [
        SizedBox(width: double.infinity, height: double.infinity),

        if (_detailBean != null)
          Positioned(
            bottom: 0,
            left: 0,
            right: 0,
            top: 0,
            child: _buildPlayerPager(),
          ),

        Positioned(
          top: AppScreen.statusBarHeight + 5,
          left: 0,
          right: 0,
          child: _headerWidget(),
        ),
      ],
    );
  }

  Widget _buildPlayerPager() {
    final detail = _detailBean!;
    final episodes = detail.episodeList;

    if (episodes.isEmpty) {
      return SkyPlayerView(
        detailBean: detail,
        dramaBean: widget.dramaBean,
        currentEpisode: _selectedEpisode?.episode,
        onSelectedEpisode: _onSelectedEpisode,
      );
    }

    return PageView.builder(
      controller: _pageController,
      scrollDirection: Axis.vertical,
      allowImplicitScrolling: true,
      onPageChanged: _onPageChanged,
      itemCount: episodes.length,
      itemBuilder: (context, index) {
        final episode = episodes[index];
        final isCurrent = index == _currentPageIndex;

        if (!_shouldBuildPlayer(index)) {
          return const ColoredBox(color: Colors.black);
        }

        return SkyPlayerView(
          key: ValueKey(
            '${episode.shortPlayVideoId}-$isCurrent-${detail.videoInfo?.shortPlayVideoId}',
          ),
          autoPlay: isCurrent,
          detailBean: detail,
          dramaBean: widget.dramaBean,
          currentEpisode: episode.episode,
          onSelectedEpisode: _onSelectedEpisode,
        );
      },
    );
  }

  bool _shouldBuildPlayer(int index) {
    return (index - _currentPageIndex).abs() <= _preloadCount;
  }

  Widget _headerWidget() {
    return Container(
      height: 40,
      padding: const EdgeInsets.only(right: 15, left: 5),
      child: Row(
        children: [
          IconButton(
            icon: HelpImg.asset(ConstImg.back, width: 32),
            onPressed: () => HelpNav.back(),
          ),
          Expanded(
            child: SkyText(
              text: widget.dramaBean.name,
              color: Colors.white,
              fontSize: 16,
              textAlign: TextAlign.center,
              fontWeight: FontWeight.bold,
            ),
          ),
          SizedBox(width: 40),
        ],
      ),
    );
  }
}