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

class MiniPlayer extends StatefulWidget {
  const MiniPlayer({super.key});

  @override
  State<MiniPlayer> createState() => _MiniPlayerState();
}

class _MiniPlayerState extends State<MiniPlayer> {
  final PlayerService _player = PlayerService();
  Duration _position = Duration.zero;
  Duration _dauer = Duration.zero;
  bool _spielt = false;
  StreamSubscription<Duration>? _posSub;
  StreamSubscription<PlayerState>? _stateSub;
  StreamSubscription<Song?>? _songSub;

  @override
  void initState() {
    super.initState();
    _posSub = _player.positionStream.listen((pos) {
      if (mounted) {
        setState(() => _position = pos);
      }
    });
    _stateSub = _player.stateStream.listen((state) {
      if (mounted) {
        setState(() {
          _spielt = state.playing;
          _dauer = state.processingState == ProcessingState.ready
            ? (_player.dauer) : Duration.zero;
        });
      }
    });
    _songSub = _player.onSongWechsel.listen((_) {
      if (mounted) setState(() {});
    });
    _player.addListener(_onPlayerChanged);
  }

  void _onPlayerChanged() {
    if (mounted) setState(() {});
  }

  void _oeffneNowPlaying() {
    Navigator.of(context).push(
      PageRouteBuilder(
        transitionDuration: const Duration(milliseconds: 350),
        reverseTransitionDuration: const Duration(milliseconds: 280),
        pageBuilder: (_, __, ___) => const NowPlayingScreen(),
        transitionsBuilder: (_, animation, __, child) {
          final offset = Tween<Offset>(
            begin: const Offset(0, 1),
            end: Offset.zero,
          ).animate(
            CurvedAnimation(
              parent: animation,
              curve: Curves.easeOutCubic,
              reverseCurve: Curves.easeInCubic,
            ),
          );
          return SlideTransition(position: offset, child: child);
        },
      ),
    );
  }

  @override
  void dispose() {
    _player.removeListener(_onPlayerChanged);
    _posSub?.cancel();
    _stateSub?.cancel();
    _songSub?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final song = _player.aktuellerSong;
    if (song == null) return const SizedBox.shrink();

    final progress = _dauer.inSeconds > 0
      ? _position.inSeconds / _dauer.inSeconds : 0.0;
    final hatCover = song.coverPfad != null && File(song.coverPfad!).existsSync();
    final akzent = MeloTheme.akzent;

    return GestureDetector(
      onTap: _oeffneNowPlaying,
      child: Container(
        margin: const EdgeInsets.symmetric(horizontal: 16),
        decoration: BoxDecoration(
          color: MeloTheme.dunkel1,
          borderRadius: BorderRadius.circular(20),
          border: Border.all(color: MeloTheme.dunkel2),
          boxShadow: [
            BoxShadow(
              color: akzent.withValues(alpha: 0.15),
              blurRadius: 20,
              offset: const Offset(0, 4),
            ),
          ],
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(12, 10, 12, 6),
            child: Row(
              children: [
                // Cover mit Fallback auf Notensymbol
                ClipRRect(
                  borderRadius: BorderRadius.circular(12),
                  child: Container(
                    width: 36, height: 36,
                    decoration: BoxDecoration(
                      gradient: LinearGradient(
                        colors: [akzent, Color.lerp(akzent, Colors.black, 0.5)!],
                      ),
                    ),
                    child: hatCover
                        ? Image.file(File(song.coverPfad!), fit: BoxFit.cover)
                        : const Center(child: Text('♪', style: TextStyle(fontSize: 16, color: Colors.white))),
                  ),
                ),
                const SizedBox(width: 10),
                // Titel + Künstler
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(song.titel, style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600, color: Colors.white)),
                      Text(song.kuenstler, style: const TextStyle(fontSize: 11, color: MeloTheme.textSekundaer)),
                    ],
                  ),
                ),
                // Shuffle
                _shuffleBtn(),
                // Repeat (3 Zustände)
                _repeatBtn(),
                // Steuerung
                _btn(Icons.skip_previous, _player.vorheriges),
                _playBtn(),
                _btn(Icons.skip_next, _player.naechstes),
              ],
            ),
          ),
          // Fortschritt
          if (_dauer.inSeconds > 0) Padding(
            padding: const EdgeInsets.fromLTRB(12, 0, 12, 8),
            child: ClipRRect(
              borderRadius: BorderRadius.circular(2),
              child: LinearProgressIndicator(
                value: progress,
                backgroundColor: MeloTheme.dunkel2,
                valueColor: AlwaysStoppedAnimation(akzent),
                minHeight: 2,
              ),
            ),
          ),
          ],
        ),
      ),
    );
  }

  Widget _shuffleBtn() {
    final aktiv = _player.zufallsmodus;
    return _btn(
      Icons.shuffle,
      () => _player.setZufallsmodus(!aktiv),
      farbe: aktiv ? MeloTheme.akzent : Colors.white,
    );
  }

  Widget _repeatBtn() {
    final modus = _player.wiederholmodus;
    final (icon, farbe) = switch (modus) {
      Wiederholmodus.aus => (Icons.repeat, Colors.white),
      Wiederholmodus.titel => (Icons.repeat_one, MeloTheme.akzent),
      Wiederholmodus.playlist => (Icons.repeat, MeloTheme.akzent),
    };
    return _btn(icon, _naechsterWiederholmodus, farbe: farbe);
  }

  void _naechsterWiederholmodus() {
    final modus = _player.wiederholmodus;
    _player.setWiederholmodus(switch (modus) {
      Wiederholmodus.aus => Wiederholmodus.titel,
      Wiederholmodus.titel => Wiederholmodus.playlist,
      Wiederholmodus.playlist => Wiederholmodus.aus,
    });
  }

  Widget _btn(IconData icon, VoidCallback onTap, {Color farbe = Colors.white}) {
    return Material(
      color: Colors.transparent,
      child: InkWell(
        borderRadius: BorderRadius.circular(50),
        onTap: onTap,
        child: Container(
          width: 32, height: 32,
          alignment: Alignment.center,
          child: Icon(icon, size: 18, color: farbe),
        ),
      ),
    );
  }

  Widget _playBtn() {
    return Material(
      color: MeloTheme.akzent,
      borderRadius: BorderRadius.circular(50),
      child: InkWell(
        borderRadius: BorderRadius.circular(50),
        onTap: _player.playPause,
        child: Container(
          width: 36, height: 36,
          alignment: Alignment.center,
          child: Icon(_spielt ? Icons.pause : Icons.play_arrow, size: 20, color: Colors.white),
        ),
      ),
    );
  }
}