import 'package:audio_service/audio_service.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../shared/cover.dart';
import '../shared/theme.dart';
import 'audio_handler.dart';
import 'now_playing_screen.dart';

/// Kompakte Wiedergabe-Leiste über der Bottom-Nav.
/// Blendet sich aus, wenn nichts läuft.
class MiniPlayer extends StatelessWidget {
  const MiniPlayer({super.key});

  /// Höhe der Zeile ohne den Fortschrittsbalken.
  static const double hoehe = 72;

  @override
  Widget build(BuildContext context) {
    final handler = context.read<MeloAudioHandler>();
    return StreamBuilder<MediaItem?>(
      stream: handler.mediaItem,
      builder: (context, snapshot) {
        final item = snapshot.data;
        // Ein- und Ausblenden statt Aufpoppen: die Leiste kommt von unten
        // dazu, wenn etwas startet.
        return AnimatedSwitcher(
          duration: MeloMotion.normal,
          switchInCurve: MeloMotion.curve,
          transitionBuilder: (kind, animation) => SizeTransition(
            sizeFactor: animation,
            alignment: Alignment.topCenter,
            child: FadeTransition(opacity: animation, child: kind),
          ),
          child: item == null
              ? const SizedBox.shrink()
              : _Leiste(handler: handler, item: item),
        );
      },
    );
  }
}

class _Leiste extends StatelessWidget {
  const _Leiste({required this.handler, required this.item});

  final MeloAudioHandler handler;
  final MediaItem item;

  @override
  Widget build(BuildContext context) {
    final texte = Theme.of(context).textTheme;
    return DecoratedBox(
      decoration: const BoxDecoration(
        color: MeloTheme.surface,
        // Trennt die Leiste vom Inhalt darüber, ohne Schatten.
        border: Border(top: BorderSide(color: MeloTheme.border)),
      ),
      child: Material(
        color: Colors.transparent,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            InkWell(
              onTap: () => Navigator.of(context).push(MaterialPageRoute(
                builder: (_) => const NowPlayingScreen(),
              )),
              child: SizedBox(
                height: MiniPlayer.hoehe,
                child: Row(
                  children: [
                    const SizedBox(width: MeloSpace.md),
                    CoverImage(artUri: item.artUri, size: 52),
                    const SizedBox(width: MeloSpace.md),
                    Expanded(
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            item.title,
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                            style: texte.bodyLarge
                                ?.copyWith(fontWeight: FontWeight.w600),
                          ),
                          Text(
                            item.artist ?? 'Unbekannt',
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                            style: texte.bodySmall,
                          ),
                        ],
                      ),
                    ),
                    const SizedBox(width: MeloSpace.sm),
                    _Bedienung(handler: handler),
                    const SizedBox(width: MeloSpace.sm),
                  ],
                ),
              ),
            ),
            _Fortschritt(handler: handler),
          ],
        ),
      ),
    );
  }
}

class _Bedienung extends StatelessWidget {
  const _Bedienung({required this.handler});

  final MeloAudioHandler handler;

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<PlaybackState>(
      stream: handler.playbackState,
      builder: (context, snap) {
        final laeuft = snap.data?.playing ?? false;
        return Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            IconButton(
              tooltip: 'Vorheriger Titel',
              icon: const Icon(Icons.skip_previous),
              onPressed: handler.skipToPrevious,
            ),
            // Der wichtigste Knopf der Leiste: eingefärbt und größer, damit
            // er sich ohne Hinsehen treffen lässt.
            IconButton.filled(
              tooltip: laeuft ? 'Pause' : 'Abspielen',
              style: IconButton.styleFrom(
                backgroundColor: MeloTheme.red,
                foregroundColor: Colors.white,
                minimumSize:
                    const Size(MeloTheme.minTouchTarget, MeloTheme.minTouchTarget),
              ),
              icon: Icon(laeuft ? Icons.pause : Icons.play_arrow, size: 26),
              onPressed: laeuft ? handler.pause : handler.play,
            ),
            IconButton(
              tooltip: 'Nächster Titel',
              icon: const Icon(Icons.skip_next),
              onPressed: handler.skipToNext,
            ),
          ],
        );
      },
    );
  }
}

class _Fortschritt extends StatelessWidget {
  const _Fortschritt({required this.handler});

  final MeloAudioHandler handler;

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<Duration?>(
      stream: handler.durationStream,
      builder: (context, dSnap) {
        final dauer = dSnap.data ?? Duration.zero;
        return StreamBuilder<Duration>(
          stream: handler.positionStream,
          builder: (context, pSnap) {
            final position = pSnap.data ?? Duration.zero;
            return LinearProgressIndicator(
              value: dauer.inMilliseconds > 0
                  ? (position.inMilliseconds / dauer.inMilliseconds)
                      .clamp(0.0, 1.0)
                  : 0,
              minHeight: 2,
              backgroundColor: MeloTheme.border,
              valueColor: const AlwaysStoppedAnimation(MeloTheme.red),
            );
          },
        );
      },
    );
  }
}