part of 'player_page.dart';

extension _PlayerPageRelink on _PlayerPageState {


  bool _handleStreamFailure() {
    if (!mounted ||
        _switchInFlight ||
        _engineFallbackInFlight ||
        _relink.pending) {
      return false;
    }
    final s = _session;
    if (s == null ||
        s.phase.value != PlaybackPhase.playing ||
        !s.engine.state.playing) {
      return false;
    }

    final ticks = ticksFromDuration(s.engine.state.position);


    if (s.lastFailureTerminal) {
      AppLogger.warn(_tag, 'stream failure terminal → skip relink, surface error');
      _rememberFailurePosition(ticks);
      s.phase.removeListener(_onSessionPhaseChanged);
      _attachWakelockSession(null);
      unawaited(s.dispose());
      setState(() {
        _session = null;
        _errorMessage = '当前版本源无法播放（服务器拒绝，HTTP 4xx）。请切换其他版本源重试。';
      });
      _invalidateBottomBar();
      return true;
    }

    _relink.schedule(
      onGiveUp: () {
        AppLogger.warn(
          _tag,
          'relink gave up after ${_relink.attempts} attempts',
        );
        _rememberFailurePosition(ticks);
        s.phase.removeListener(_onSessionPhaseChanged);
        _attachWakelockSession(null);
        unawaited(s.dispose());
        setState(() {
          _session = null;
          _errorMessage = '播放链接已失效，多次重连失败';
        });
        _invalidateBottomBar();
      },
      onRelink: (delay) {
        AppLogger.debug(
          _tag,
          'relink scheduled attempt=${_relink.attempts} '
          'delay=${delay.inSeconds}s posTicks=$ticks',
        );
        final base = _lastRequest;
        if (!mounted || base == null) return;
        final req = base.copyWith(
          startPositionTicks: ticks > 0 ? ticks : null,
          playFromStart: false,
        );
        unawaited(_switchTo(req));
      },
    );
    return true;
  }


  void _rememberFailurePosition(int ticks) {
    final base = _lastRequest;
    if (base == null || ticks <= 0) return;
    _lastRequest = base.copyWith(
      startPositionTicks: ticks,
      playFromStart: false,
    );
  }


  void _armRelinkSustain() {
    _relink.armSustain();
  }
}