part of 'player_page.dart';

extension _PlayerPageVersionBar on _PlayerPageState {


  Widget _buildVersionBarLayer(PlaybackSession session) {
    return ValueListenableBuilder<bool>(
      valueListenable: _versionBarOpen,
      builder: (context, open, _) {
        return Stack(
          fit: StackFit.expand,
          children: [
            if (open)
              Positioned.fill(
                child: GestureDetector(
                  behavior: HitTestBehavior.opaque,
                  onTap: () => _versionBarOpen.value = false,
                  child: const SizedBox.expand(),
                ),
              ),
            Positioned(
              left: 16,
              right: 16,
              bottom: Platform.isAndroid ? 96 : 72,
              child: AnimatedSwitcher(
                duration: const Duration(milliseconds: 200),
                switchInCurve: Curves.easeOutCubic,
                switchOutCurve: Curves.easeInCubic,
                transitionBuilder: (child, anim) => FadeTransition(
                  opacity: anim,
                  child: SlideTransition(
                    position: Tween<Offset>(
                      begin: const Offset(0, 0.15),
                      end: Offset.zero,
                    ).animate(anim),
                    child: child,
                  ),
                ),
                child: open
                    ? _buildVersionBar(session)
                    : const SizedBox.shrink(key: ValueKey('version-bar-empty')),
              ),
            ),
          ],
        );
      },
    );
  }


  Widget _buildVersionBar(PlaybackSession session) {
    final entries = _buildVersionCardData(session);
    if (entries.isEmpty) {
      return const SizedBox.shrink(key: ValueKey('version-bar-empty'));
    }
    return GestureDetector(
      behavior: HitTestBehavior.opaque,
      onTap: () {},
      child: KeyedSubtree(
        key: const ValueKey('version-bar'),
        child: VersionPanel(
          entries: entries,
          onClose: () => _versionBarOpen.value = false,
        ),
      ),
    );
  }


  List<VersionSourceCardData> _buildVersionCardData(PlaybackSession session) {
    final ctx = session.context;
    final localSources = ctx.allMediaSources;
    final currentSourceId = ctx.mediaSourceId;
    final currentServerName =
        _lastRequest?.targetServer?.serverName ??
        ref.read(activeSessionProvider)?.serverName ??
        '本服务器';

    final entries = <VersionSourceCardData>[];
    for (final src in localSources) {
      final isCurrent = src.Id != null && src.Id == currentSourceId;
      final sourceId = src.Id;
      entries.add(
        VersionSourceCardData.fromLocalSource(
          src,
          serverName: currentServerName,
          serverKey: ctx.serverId,
          isCurrent: isCurrent,
          tooltip: isCurrent ? null : '以该版本播放',
          onTap: (isCurrent || sourceId == null)
              ? null
              : () => _switchVersion(sourceId),
        ),
      );
    }
    for (final card in _crossServerCards) {
      entries.add(
        VersionSourceCardData.fromCrossServer(
          card,
          onTap: () => _switchToCrossServer(card),
        ),
      );
    }
    return entries;
  }
}