import 'dart:math';

import 'package:audio_service/audio_service.dart';
import 'package:audio_session/audio_session.dart';
import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart';
// import 'package:just_audio_background/just_audio_background.dart';

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

  @override
  State<AudioPlayerPage> createState() => _AudioPlayerPageState();
}

class _AudioPlayerPageState extends State<AudioPlayerPage> {
  static int _nextMediaId = 0;
  late AudioPlayer _player;
  final _playlist = ConcatenatingAudioSource(children: [
    ClippingAudioSource(
      start: const Duration(seconds: 0),
      end: const Duration(seconds: 90),
      child: AudioSource.uri(Uri.parse(
          "https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3")),
      tag: MediaItem(
        id: '${_nextMediaId++}',
        album: "Science Friday",
        title: "A Salute To Head-Scratching Science (30 seconds)",
        artUri: Uri.parse(
            "https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
      ),
    ),
    // AudioSource.uri(
    //   Uri.parse(
    //       "https://upos-sz-mirror08c.bilivideo.com/upgcxcode/05/52/1205825205/1205825205-1-16.mp4?e=ig8euxZM2rNcNbRVhwdVhwdlhWdVhwdVhoNvNC8BqJIzNbfq9rVEuxTEnE8L5F6VnEsSTx0vkX8fqJeYTj_lta53NCM=&uipk=5&nbs=1&deadline=1693821903&gen=playurlv2&os=08cbv&oi=1865700872&trid=bfc9c19f85c545dd8f4794ff97f4f57fh&mid=17340771&platform=html5&upsig=9bf98515091bb8a80e1950a03a2a0d68&uparams=e,uipk,nbs,deadline,gen,os,oi,trid,mid,platform&bvc=vod&nettype=0&f=h_0_0&bw=49663&logo=80000000"),
    //   headers: {
    //     'user-agent':
    //         'Mozilla/5.0 (Macintosh; Intel Mac OS X 13_3_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.4 Safari/605.1.15',
    //     'referer': 'https://www.bilibili.com'
    //   },
    //   tag: MediaItem(
    //     id: '${_nextMediaId++}',
    //     album: "Science Friday",
    //     title: "A Salute To Head-Scratching Science",
    //     artUri: Uri.parse(
    //         "https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
    //   ),
    // ),
    AudioSource.uri(
      Uri.parse("https://s3.amazonaws.com/scifri-segments/scifri201711241.mp3"),
      tag: MediaItem(
        id: '${_nextMediaId++}',
        album: "Science Friday",
        title: "From Cat Rheology To Operatic Incompetence",
        artUri: Uri.parse(
            "https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
      ),
    ),
    AudioSource.uri(
      Uri.parse("asset:///audio/nature.mp3"),
      tag: MediaItem(
        id: '${_nextMediaId++}',
        album: "Public Domain",
        title: "Nature Sounds",
        artUri: Uri.parse(
            "https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
      ),
    ),
  ]);

  @override
  void initState() {
    super.initState();
    _player = AudioPlayer();

    _init();
  }

  @override
  void dispose() {
    _player.dispose();
    super.dispose();
  }

  Future<void> _init() async {
    final session = await AudioSession.instance;
    await session.configure(const AudioSessionConfiguration.speech());
    // Listen to errors during playback.
    _player.playbackEventStream.listen((event) {},
        onError: (Object e, StackTrace stackTrace) {
      print('A stream error occurred: $e');
    });
    try {
      await _player.setAudioSource(_playlist);
    } catch (e, stackTrace) {
      // Catch load errors: 404, invalid url ...
      print("Error loading playlist: $e");
      print(stackTrace);
    }
  }

  // Stream<PositionData> get _positionDataStream =>
  //     Rx.combineLatest3<Duration, Duration, Duration?, PositionData>(
  //         _player.positionStream,
  //         _player.bufferedPositionStream,
  //         _player.durationStream,
  //         (position, bufferedPosition, duration) => PositionData(
  //             position, bufferedPosition, duration ?? Duration.zero));

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Expanded(
              child: StreamBuilder<SequenceState?>(
                stream: _player.sequenceStateStream,
                builder: (context, snapshot) {
                  final state = snapshot.data;
                  if (state?.sequence.isEmpty ?? true) {
                    return const SizedBox();
                  }
                  final metadata = state!.currentSource!.tag as MediaItem;
                  return Column(
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: [
                      Expanded(
                        child: Padding(
                          padding: const EdgeInsets.all(8.0),
                          child: Center(
                              child: Image.network(metadata.artUri.toString())),
                        ),
                      ),
                      Text(metadata.album!,
                          style: Theme.of(context).textTheme.titleLarge),
                      Text(metadata.title),
                    ],
                  );
                },
              ),
            ),
            ControlButtons(_player),
            // StreamBuilder<PositionData>(
            //   stream: _positionDataStream,
            //   builder: (context, snapshot) {
            //     final positionData = snapshot.data;
            //     return SeekBar(
            //       duration: positionData?.duration ?? Duration.zero,
            //       position: positionData?.position ?? Duration.zero,
            //       bufferedPosition:
            //           positionData?.bufferedPosition ?? Duration.zero,
            //       onChangeEnd: (newPosition) {
            //         _player.seek(newPosition);
            //       },
            //     );
            //   },
            // ),
            const SizedBox(height: 8.0),
            Row(
              children: [
                StreamBuilder<LoopMode>(
                  stream: _player.loopModeStream,
                  builder: (context, snapshot) {
                    final loopMode = snapshot.data ?? LoopMode.off;
                    const icons = [
                      Icon(Icons.repeat, color: Colors.grey),
                      Icon(Icons.repeat, color: Colors.orange),
                      Icon(Icons.repeat_one, color: Colors.orange),
                    ];
                    const cycleModes = [
                      LoopMode.off,
                      LoopMode.all,
                      LoopMode.one,
                    ];
                    final index = cycleModes.indexOf(loopMode);
                    return IconButton(
                      icon: icons[index],
                      onPressed: () {
                        _player.setLoopMode(cycleModes[
                            (cycleModes.indexOf(loopMode) + 1) %
                                cycleModes.length]);
                      },
                    );
                  },
                ),
                Expanded(
                  child: Text(
                    "Playlist",
                    style: Theme.of(context).textTheme.titleLarge,
                    textAlign: TextAlign.center,
                  ),
                ),
                StreamBuilder<bool>(
                  stream: _player.shuffleModeEnabledStream,
                  builder: (context, snapshot) {
                    final shuffleModeEnabled = snapshot.data ?? false;
                    return IconButton(
                      icon: shuffleModeEnabled
                          ? const Icon(Icons.shuffle, color: Colors.orange)
                          : const Icon(Icons.shuffle, color: Colors.grey),
                      onPressed: () async {
                        final enable = !shuffleModeEnabled;
                        if (enable) {
                          await _player.shuffle();
                        }
                        await _player.setShuffleModeEnabled(enable);
                      },
                    );
                  },
                ),
              ],
            ),
            SizedBox(
              height: 240.0,
              child: StreamBuilder<SequenceState?>(
                stream: _player.sequenceStateStream,
                builder: (context, snapshot) {
                  final state = snapshot.data;
                  final sequence = state?.sequence ?? [];
                  return ReorderableListView(
                    onReorder: (int oldIndex, int newIndex) {
                      if (oldIndex < newIndex) newIndex--;
                      _playlist.move(oldIndex, newIndex);
                    },
                    children: [
                      for (var i = 0; i < sequence.length; i++)
                        Dismissible(
                          key: ValueKey(sequence[i]),
                          background: Container(
                            color: Colors.redAccent,
                            alignment: Alignment.centerRight,
                            child: const Padding(
                              padding: EdgeInsets.only(right: 8.0),
                              child: Icon(Icons.delete, color: Colors.white),
                            ),
                          ),
                          onDismissed: (dismissDirection) {
                            _playlist.removeAt(i);
                          },
                          child: Material(
                            color: i == state!.currentIndex
                                ? Colors.grey.shade300
                                : null,
                            child: ListTile(
                              title: Text(sequence[i].tag.title as String),
                              onTap: () {
                                _player.seek(Duration.zero, index: i);
                              },
                            ),
                          ),
                        ),
                    ],
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class ControlButtons extends StatelessWidget {
  final AudioPlayer player;

  const ControlButtons(this.player, {Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        IconButton(
          icon: const Icon(Icons.volume_up),
          onPressed: () {
            showSliderDialog(
              context: context,
              title: "Adjust volume",
              divisions: 10,
              min: 0.0,
              max: 1.0,
              stream: player.volumeStream,
              onChanged: player.setVolume,
            );
          },
        ),
        StreamBuilder<SequenceState?>(
          stream: player.sequenceStateStream,
          builder: (context, snapshot) => IconButton(
            icon: const Icon(Icons.skip_previous),
            onPressed: player.hasPrevious ? player.seekToPrevious : null,
          ),
        ),
        StreamBuilder<PlayerState>(
          stream: player.playerStateStream,
          builder: (context, snapshot) {
            final playerState = snapshot.data;
            final processingState = playerState?.processingState;
            final playing = playerState?.playing;
            if (processingState == ProcessingState.loading ||
                processingState == ProcessingState.buffering) {
              return Container(
                margin: const EdgeInsets.all(8.0),
                width: 64.0,
                height: 64.0,
                child: const CircularProgressIndicator(),
              );
            } else if (playing != true) {
              return IconButton(
                icon: const Icon(Icons.play_arrow),
                iconSize: 64.0,
                onPressed: player.play,
              );
            } else if (processingState != ProcessingState.completed) {
              return IconButton(
                icon: const Icon(Icons.pause),
                iconSize: 64.0,
                onPressed: player.pause,
              );
            } else {
              return IconButton(
                icon: const Icon(Icons.replay),
                iconSize: 64.0,
                onPressed: () => player.seek(Duration.zero,
                    index: player.effectiveIndices!.first),
              );
            }
          },
        ),
        StreamBuilder<SequenceState?>(
          stream: player.sequenceStateStream,
          builder: (context, snapshot) => IconButton(
            icon: const Icon(Icons.skip_next),
            onPressed: player.hasNext ? player.seekToNext : null,
          ),
        ),
        StreamBuilder<double>(
          stream: player.speedStream,
          builder: (context, snapshot) => IconButton(
            icon: Text("${snapshot.data?.toStringAsFixed(1)}x",
                style: const TextStyle(fontWeight: FontWeight.bold)),
            onPressed: () {
              showSliderDialog(
                context: context,
                title: "Adjust speed",
                divisions: 10,
                min: 0.5,
                max: 1.5,
                stream: player.speedStream,
                onChanged: player.setSpeed,
              );
            },
          ),
        ),
      ],
    );
  }
}

void showSliderDialog({
  required BuildContext context,
  required String title,
  required int divisions,
  required double min,
  required double max,
  String valueSuffix = '',
  required Stream<double> stream,
  required ValueChanged<double> onChanged,
}) {
  showDialog<void>(
    context: context,
    builder: (context) => AlertDialog(
      title: Text(title, textAlign: TextAlign.center),
      content: StreamBuilder<double>(
        stream: stream,
        builder: (context, snapshot) => SizedBox(
          height: 100.0,
          child: Column(
            children: [
              Text('${snapshot.data?.toStringAsFixed(1)}$valueSuffix',
                  style: const TextStyle(
                      fontFamily: 'Fixed',
                      fontWeight: FontWeight.bold,
                      fontSize: 24.0)),
              Slider(
                divisions: divisions,
                min: min,
                max: max,
                value: snapshot.data ?? 1.0,
                onChanged: onChanged,
              ),
            ],
          ),
        ),
      ),
    ),
  );
}

class PositionData {
  final Duration position;
  final Duration bufferedPosition;
  final Duration duration;

  PositionData(this.position, this.bufferedPosition, this.duration);
}

class SeekBar extends StatefulWidget {
  final Duration duration;
  final Duration position;
  final Duration bufferedPosition;
  final ValueChanged<Duration>? onChanged;
  final ValueChanged<Duration>? onChangeEnd;

  const SeekBar({
    Key? key,
    required this.duration,
    required this.position,
    required this.bufferedPosition,
    this.onChanged,
    this.onChangeEnd,
  }) : super(key: key);

  @override
  SeekBarState createState() => SeekBarState();
}

class SeekBarState extends State<SeekBar> {
  double? _dragValue;
  late SliderThemeData _sliderThemeData;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();

    _sliderThemeData = SliderTheme.of(context).copyWith(
      trackHeight: 2.0,
    );
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        SliderTheme(
          data: _sliderThemeData.copyWith(
            thumbShape: HiddenThumbComponentShape(),
            activeTrackColor: Colors.blue.shade100,
            inactiveTrackColor: Colors.grey.shade300,
          ),
          child: ExcludeSemantics(
            child: Slider(
              min: 0.0,
              max: widget.duration.inMilliseconds.toDouble(),
              value: min(widget.bufferedPosition.inMilliseconds.toDouble(),
                  widget.duration.inMilliseconds.toDouble()),
              onChanged: (value) {
                setState(() {
                  _dragValue = value;
                });
                if (widget.onChanged != null) {
                  widget.onChanged!(Duration(milliseconds: value.round()));
                }
              },
              onChangeEnd: (value) {
                if (widget.onChangeEnd != null) {
                  widget.onChangeEnd!(Duration(milliseconds: value.round()));
                }
                _dragValue = null;
              },
            ),
          ),
        ),
        SliderTheme(
          data: _sliderThemeData.copyWith(
            inactiveTrackColor: Colors.transparent,
          ),
          child: Slider(
            min: 0.0,
            max: widget.duration.inMilliseconds.toDouble(),
            value: min(_dragValue ?? widget.position.inMilliseconds.toDouble(),
                widget.duration.inMilliseconds.toDouble()),
            onChanged: (value) {
              setState(() {
                _dragValue = value;
              });
              if (widget.onChanged != null) {
                widget.onChanged!(Duration(milliseconds: value.round()));
              }
            },
            onChangeEnd: (value) {
              if (widget.onChangeEnd != null) {
                widget.onChangeEnd!(Duration(milliseconds: value.round()));
              }
              _dragValue = null;
            },
          ),
        ),
        Positioned(
          right: 16.0,
          bottom: 0.0,
          child: Text(
              RegExp(r'((^0*[1-9]\d*:)?\d{2}:\d{2})\.\d+$')
                      .firstMatch("$_remaining")
                      ?.group(1) ??
                  '$_remaining',
              style: Theme.of(context).textTheme.bodySmall),
        ),
      ],
    );
  }

  Duration get _remaining => widget.duration - widget.position;
}

class HiddenThumbComponentShape extends SliderComponentShape {
  @override
  Size getPreferredSize(bool isEnabled, bool isDiscrete) => Size.zero;

  @override
  void paint(
    PaintingContext context,
    Offset center, {
    required Animation<double> activationAnimation,
    required Animation<double> enableAnimation,
    required bool isDiscrete,
    required TextPainter labelPainter,
    required RenderBox parentBox,
    required SliderThemeData sliderTheme,
    required TextDirection textDirection,
    required double value,
    required double textScaleFactor,
    required Size sizeWithOverflow,
  }) {}
}