import 'dart:async';
import 'package:flutter/material.dart';
import '../services/player_service.dart';
import '../models/song.dart';
import '../utils/farb_theme.dart';

/// Bottom-Sheet mit der aktuellen Warteschlange:
/// aktueller Song markiert, Tipp = abspielen, Drag-and-Drop = umsortieren.
class WarteschlangeSheet extends StatefulWidget {
  const WarteschlangeSheet({super.key});

  @override
  State<WarteschlangeSheet> createState() => _WarteschlangeSheetState();
}

class _WarteschlangeSheetState extends State<WarteschlangeSheet> {
  final PlayerService _player = PlayerService();
  Timer? _tick;

  @override
  void initState() {
    super.initState();
    // Sekunden-Tick für die Sleep-Timer-Restzeitanzeige
    _tick = Timer.periodic(const Duration(seconds: 1), (_) {
      if (mounted && _player.sleepTimerAktiv) setState(() {});
    });
  }

  @override
  void dispose() {
    _tick?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: _player,
      builder: (context, _) {
        final queue = _player.warteschlange;
        final aktueller = _player.aktuellerIndex;
        return SafeArea(
          child: Padding(
            padding: EdgeInsets.only(
              bottom: MediaQuery.of(context).viewInsets.bottom,
            ),
            child: ConstrainedBox(
              constraints: BoxConstraints(
                maxHeight: MediaQuery.of(context).size.height * 0.75,
              ),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  // Griff
                  Container(
                    width: 36,
                    height: 4,
                    margin: const EdgeInsets.only(top: 10, bottom: 4),
                    decoration: BoxDecoration(
                      color: MeloTheme.dunkel2,
                      borderRadius: BorderRadius.circular(2),
                    ),
                  ),
                  // Kopfzeile
                  Padding(
                    padding: const EdgeInsets.fromLTRB(20, 8, 8, 4),
                    child: Row(
                      children: [
                        const Icon(Icons.queue_music, size: 18, color: MeloTheme.rot),
                        const SizedBox(width: 8),
                        Text(
                          'Warteschlange',
                          style: const TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.w600,
                            color: Colors.white,
                          ),
                        ),
                        const SizedBox(width: 8),
                        Text(
                          '${queue.length} Titel',
                          style: const TextStyle(
                            fontSize: 12,
                            color: MeloTheme.textSekundaer,
                          ),
                        ),
                        const Spacer(),
                        IconButton(
                          icon: const Icon(Icons.close, size: 18, color: MeloTheme.textSekundaer),
                          onPressed: () => Navigator.pop(context),
                          tooltip: 'Schließen',
                        ),
                      ],
                    ),
                  ),
                  const Divider(height: 1, color: MeloTheme.dunkel2),
                  _sleepTimerZeile(),
                  const Divider(height: 1, color: MeloTheme.dunkel2),
                  // Liste
                  if (queue.isEmpty)
                    const Expanded(
                      child: Center(
                        child: Text(
                          'Keine Songs in der Warteschlange',
                          style: TextStyle(fontSize: 13, color: MeloTheme.textSekundaer),
                        ),
                      ),
                    )
                  else
                    Flexible(
                      child: ReorderableListView.builder(
                        shrinkWrap: true,
                        padding: const EdgeInsets.fromLTRB(8, 4, 8, 16),
                        itemCount: queue.length,
                        // onReorderItem liefert den newIndex bereits angepasst
                        onReorderItem: (alt, neu) =>
                            _player.verschiebeInWarteschlange(alt, neu),
                        itemBuilder: (_, i) => _eintrag(queue[i], i, aktueller),
                      ),
                    ),
                ],
              ),
            ),
          ),
        );
      },
    );
  }

  /// Sleep-Timer-Zeile: Optionen Aus/15/30/45/60 Min + Restzeit wenn aktiv
  Widget _sleepTimerZeile() {
    final aktiv = _player.sleepTimerAktiv;
    final rest = _player.sleepRestzeit;
    return Padding(
      padding: const EdgeInsets.fromLTRB(20, 8, 20, 8),
      child: Row(
        children: [
          Icon(
            Icons.bedtime,
            size: 16,
            color: aktiv ? MeloTheme.rot : MeloTheme.textSekundaer,
          ),
          const SizedBox(width: 8),
          const Text(
            'Schlaf-Timer',
            style: TextStyle(fontSize: 13, color: Colors.white),
          ),
          if (aktiv && rest != null) ...[
            const SizedBox(width: 8),
            Text(
              _formatRestzeit(rest),
              style: const TextStyle(fontSize: 12, color: MeloTheme.rot),
            ),
          ],
          const Spacer(),
          _zeitChip('Aus', null, aktiv: !aktiv),
          _zeitChip('15', const Duration(minutes: 15)),
          _zeitChip('30', const Duration(minutes: 30)),
          _zeitChip('45', const Duration(minutes: 45)),
          _zeitChip('60', const Duration(minutes: 60)),
        ],
      ),
    );
  }

  Widget _zeitChip(String label, Duration? dauer, {bool aktiv = false}) {
    return GestureDetector(
      onTap: () {
        if (dauer == null) {
          _player.cancelSleepTimer();
        } else {
          _player.setSleepTimer(dauer);
        }
      },
      child: Container(
        margin: const EdgeInsets.only(left: 6),
        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
        decoration: BoxDecoration(
          color: aktiv ? MeloTheme.rot : MeloTheme.dunkel2,
          borderRadius: BorderRadius.circular(12),
        ),
        child: Text(
          label,
          style: TextStyle(
            fontSize: 11,
            color: aktiv ? Colors.white : MeloTheme.textSekundaer,
          ),
        ),
      ),
    );
  }

  String _formatRestzeit(Duration rest) {
    final min = rest.inMinutes;
    final sek = rest.inSeconds % 60;
    return '⏱ ${min.toString().padLeft(2, '0')}:${sek.toString().padLeft(2, '0')}';
  }

  Widget _eintrag(Song song, int index, int aktueller) {
    final istAktuell = index == aktueller;
    return ListTile(
      key: ValueKey('$index-${song.id ?? song.titel}'),
      dense: true,
      leading: istAktuell
          ? const Icon(Icons.play_arrow, color: MeloTheme.rot, size: 18)
          : SizedBox(
              width: 18,
              child: Text(
                '${index + 1}',
                textAlign: TextAlign.center,
                style: const TextStyle(fontSize: 11, color: MeloTheme.textSekundaer),
              ),
            ),
      title: Text(
        song.titel,
        style: TextStyle(
          fontSize: 13,
          fontWeight: istAktuell ? FontWeight.w700 : FontWeight.w400,
          color: istAktuell ? MeloTheme.rot : Colors.white,
        ),
      ),
      subtitle: Text(
        song.kuenstler,
        style: const TextStyle(fontSize: 11, color: MeloTheme.textSekundaer),
      ),
      trailing: Text(
        song.dauerFormatiert,
        style: const TextStyle(fontSize: 11, color: MeloTheme.textSekundaer),
      ),
      onTap: () => _player.spiele(song),
    );
  }
}