import 'dart:ui';
import 'dart:async';

import 'package:flutter/material.dart';
import 'package:audio_service/audio_service.dart';
import 'package:freezer/api/deezer.dart';
import 'package:freezer/api/player.dart';
import 'package:freezer/ui/menu.dart';
import 'package:freezer/ui/tiles.dart';

import 'cached_image.dart';
import '../api/definitions.dart';
import 'player_bar.dart';



class PlayerScreen extends StatefulWidget {
  @override
  _PlayerScreenState createState() => _PlayerScreenState();
}

class _PlayerScreenState extends State<PlayerScreen> {

  double iconSize = 48;
  bool _lyrics = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: StreamBuilder(
          stream: AudioService.playbackStateStream,
          builder: (BuildContext context, AsyncSnapshot snapshot) {

            //Disable lyrics when skipping songs, loading
            PlaybackState s = snapshot.data;
            if (s != null && s.processingState != AudioProcessingState.ready && s.processingState != AudioProcessingState.buffering) _lyrics = false;

            return OrientationBuilder(
              builder: (context, orientation) {
                //Landscape
                if (orientation == Orientation.landscape) {
                  return Row(
                    mainAxisSize: MainAxisSize.max,
                    mainAxisAlignment: MainAxisAlignment.spaceAround,
                    children: <Widget>[
                      Padding(
                          padding: EdgeInsets.fromLTRB(16, 0, 16, 8),
                          child: Container(
                            width: 320,
                            child: Stack(
                              children: <Widget>[
                                CachedImage(
                                  url: AudioService.currentMediaItem.artUri,
                                ),
                                if (_lyrics) LyricsWidget(
                                  artUri: AudioService.currentMediaItem.artUri,
                                  trackId: AudioService.currentMediaItem.id,
                                  lyrics: Track.fromMediaItem(AudioService.currentMediaItem).lyrics,
                                  height: 320.0,
                                ),
                              ],
                            ),
                          )
                      ),
                      SizedBox(
                        width: MediaQuery.of(context).size.width / 2 - 32,
                        child: Column(
                          mainAxisSize: MainAxisSize.max,
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: <Widget>[
                            Padding(
                                padding: EdgeInsets.fromLTRB(8, 16, 8, 0),
                                child: Container(
                                  width: 300,
                                  child: PlayerScreenTopRow(),
                                )
                            ),
                            Column(
                              mainAxisSize: MainAxisSize.min,
                              children: <Widget>[
                                Text(
                                  AudioService.currentMediaItem.displayTitle,
                                  maxLines: 1,
                                  textAlign: TextAlign.center,
                                  overflow: TextOverflow.clip,
                                  style: TextStyle(
                                      fontSize: 24.0,
                                      fontWeight: FontWeight.bold
                                  ),
                                ),
                                Container(height: 4,),
                                Text(
                                  AudioService.currentMediaItem.displaySubtitle,
                                  maxLines: 1,
                                  textAlign: TextAlign.center,
                                  overflow: TextOverflow.clip,
                                  style: TextStyle(
                                    fontSize: 18.0,
                                    color: Theme.of(context).primaryColor,
                                  ),
                                ),
                              ],
                            ),
                            Container(
                              width: 320,
                              child: SeekBar(),
                            ),
                            Container(
                              width: 320,
                              child: Row(
                                mainAxisAlignment: MainAxisAlignment.spaceAround,
                                mainAxisSize: MainAxisSize.max,
                                children: <Widget>[
                                  PrevNextButton(iconSize, prev: true,),
                                  PlayPauseButton(iconSize),
                                  PrevNextButton(iconSize)
                                ],
                              ),
                            ),
                            Padding(
                                padding: EdgeInsets.fromLTRB(8, 0, 8, 16),
                                child: Container(
                                  width: 300,
                                  child: Row(
                                    mainAxisSize: MainAxisSize.max,
                                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                                    children: <Widget>[
                                      IconButton(
                                        icon: Icon(Icons.subtitles),
                                        onPressed: () {
                                          setState(() => _lyrics = !_lyrics);
                                        },
                                      ),
                                      Text(
                                          AudioService.currentMediaItem.extras['qualityString']
                                      ),
                                      IconButton(
                                        icon: Icon(Icons.more_vert),
                                        onPressed: () {
                                          Track t = Track.fromMediaItem(AudioService.currentMediaItem);
                                          MenuSheet m = MenuSheet(context);
                                          m.defaultTrackMenu(t);
                                        },
                                      )
                                    ],
                                  ),
                                )
                            )
                          ],
                        ),
                      )
                    ],
                  );
                }

                //Portrait
                return Column(
                  mainAxisSize: MainAxisSize.max,
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: <Widget>[
                    Padding(
                        padding: EdgeInsets.fromLTRB(28, 16, 28, 0),
                        child: PlayerScreenTopRow()
                    ),
                    Padding(
                        padding: EdgeInsets.fromLTRB(16, 8, 16, 8),
                        child: Container(
                          height: 360,
                          child: Stack(
                            children: <Widget>[
                              CachedImage(
                                url: AudioService.currentMediaItem.artUri,
                              ),
                              if (_lyrics) LyricsWidget(
                                artUri: AudioService.currentMediaItem.artUri,
                                trackId: AudioService.currentMediaItem.id,
                                lyrics: Track.fromMediaItem(AudioService.currentMediaItem).lyrics,
                                height: 360.0,
                              ),
                            ],
                          ),
                        )
                    ),
                    Column(
                      mainAxisSize: MainAxisSize.min,
                      children: <Widget>[
                        Text(
                          AudioService.currentMediaItem.displayTitle,
                          maxLines: 1,
                          textAlign: TextAlign.center,
                          overflow: TextOverflow.clip,
                          style: TextStyle(
                              fontSize: 24.0,
                              fontWeight: FontWeight.bold
                          ),
                        ),
                        Container(height: 4,),
                        Text(
                          AudioService.currentMediaItem.displaySubtitle,
                          maxLines: 1,
                          textAlign: TextAlign.center,
                          overflow: TextOverflow.clip,
                          style: TextStyle(
                            fontSize: 18.0,
                            color: Theme.of(context).primaryColor,
                          ),
                        ),
                      ],
                    ),
                    SeekBar(),
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceAround,
                      mainAxisSize: MainAxisSize.max,
                      children: <Widget>[
                        PrevNextButton(iconSize, prev: true,),
                        PlayPauseButton(iconSize),
                        PrevNextButton(iconSize)
                      ],
                    ),
                    //Container(height: 8.0,),
                    Padding(
                      padding: EdgeInsets.symmetric(vertical: 4.0, horizontal: 16.0),
                      child: Row(
                        mainAxisSize: MainAxisSize.max,
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: <Widget>[
                          IconButton(
                            icon: Icon(Icons.subtitles),
                            onPressed: () {
                              setState(() => _lyrics = !_lyrics);
                            },
                          ),
                          Text(
                              AudioService.currentMediaItem.extras['qualityString']
                          ),
                          IconButton(
                            icon: Icon(Icons.more_vert),
                            onPressed: () {
                              Track t = Track.fromMediaItem(AudioService.currentMediaItem);
                              MenuSheet m = MenuSheet(context);
                              m.defaultTrackMenu(t);
                            },
                          )
                        ],
                      ),
                    )
                  ],
                );

              },
            );
          },
        ),
      )
    );
  }
}

class LyricsWidget extends StatefulWidget {

  final Lyrics lyrics;
  final String trackId;
  final String artUri;
  final double height;
  LyricsWidget({this.artUri, this.lyrics, this.trackId, this.height, Key key}): super(key: key);

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

class _LyricsWidgetState extends State<LyricsWidget> {

  bool _loading = true;
  Lyrics _l;
  Color _textColor = Colors.black;
  ScrollController _scrollController = ScrollController();
  Timer _timer;
  int _currentIndex;
  double _boxHeight;

  Future _load() async {
    //Get text color by album art (black or white)
    if (widget.artUri != null) {
      bool bw = await imagesDatabase.isDark(widget.artUri);
      if (bw != null) setState(() => _textColor = bw?Colors.white:Colors.black);
    }

    if (widget.lyrics.lyrics == null || widget.lyrics.lyrics.length == 0) {
      //Load from api
      try {
        _l = await deezerAPI.lyrics(widget.trackId);
        setState(() => _loading = false);
      } catch (e) {
        //Error Lyrics
        setState(() => _l = Lyrics().error);
      }
    } else {
      //Use provided lyrics
      _l = widget.lyrics;
      setState(() => _loading = false);
    }
  }

  @override
  void initState() {
    this._boxHeight = widget.height??400.0;
    _load();
    Timer.periodic(Duration(milliseconds: 500), (timer) {
      _timer = timer;
      if (_loading) return;
      //Update index of current lyric
      setState(() {
        _currentIndex = _l.lyrics.lastIndexWhere((l) => l.offset <= AudioService.playbackState.currentPosition);
      });
      //Scroll to current lyric
      if (_currentIndex <= 0) return;
      _scrollController.animateTo(
        (_boxHeight * _currentIndex),
        duration: Duration(milliseconds: 250),
        curve: Curves.ease
      );

    });
    super.initState();
  }

  @override
  void dispose() {
    if (_timer != null) _timer.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      height: _boxHeight,
      width: _boxHeight,
      child: BackdropFilter(
        filter: ImageFilter.blur(
          sigmaX: 7.0,
          sigmaY: 7.0
        ),
        child: Container(
            child: _loading?
            Center(child: CircularProgressIndicator(),) :
            SingleChildScrollView(
              controller: _scrollController,
              child: Column(
                children: List.generate(_l.lyrics.length, (i) {
                  return Container(
                      height: _boxHeight,
                      child: Center(
                        child: Text(
                          _l.lyrics[i].text,
                          textAlign: TextAlign.center,
                          style: TextStyle(
                              color: _textColor,
                              fontSize: 40.0,
                              fontWeight: (_currentIndex == i)?FontWeight.bold:FontWeight.normal
                          ),
                        ),
                      )
                  );
                }),
              ),
            )
        ),
      ),
    );
  }
}

//Top row containing QueueSource, queue...
class PlayerScreenTopRow extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
        Text(
          'Playing from: ' + playerHelper.queueSource.text,
          maxLines: 1,
          overflow: TextOverflow.ellipsis,
          textAlign: TextAlign.right,
          style: TextStyle(fontSize: 16.0),
        ),
        Row(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            RepeatButton(),
            Container(width: 16.0,),
            InkWell(
              child: Icon(Icons.menu),
              onTap: (){
                Navigator.of(context).push(MaterialPageRoute(
                    builder: (context) => QueueScreen()
                ));
              },
            ),
          ],
        )
      ],
    );
  }
}



class RepeatButton extends StatefulWidget {
  @override
  _RepeatButtonState createState() => _RepeatButtonState();
}

class _RepeatButtonState extends State<RepeatButton> {

  Icon get icon {
    switch (playerHelper.repeatType) {
      case RepeatType.NONE:
        return Icon(Icons.repeat);
      case RepeatType.LIST:
        return Icon(
          Icons.repeat,
          color: Theme.of(context).primaryColor,
        );
      case RepeatType.TRACK:
        return Icon(
          Icons.repeat_one,
          color: Theme.of(context).primaryColor,
        );
    }
  }

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () async {
        await playerHelper.changeRepeat();
        setState(() {});
      },
      child: icon,
    );
  }
}



class SeekBar extends StatefulWidget {
  @override
  _SeekBarState createState() => _SeekBarState();
}

class _SeekBarState extends State<SeekBar> {

  bool _seeking = false;
  double _pos;

  double get position {
    if (_seeking) return _pos;
    if (AudioService.playbackState == null) return 0.0;
    double p = AudioService.playbackState.currentPosition.inMilliseconds.toDouble()??0.0;
    if (p > duration) return duration;
    return p;
  }

  //Duration to mm:ss
  String _timeString(double pos) {
    Duration d = Duration(milliseconds: pos.toInt());
    return "${d.inMinutes}:${d.inSeconds.remainder(60).toString().padLeft(2, '0')}";
  }

  double get duration {
    if (AudioService.currentMediaItem == null) return 1.0;
    return AudioService.currentMediaItem.duration.inMilliseconds.toDouble();
  }

  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: Stream.periodic(Duration(milliseconds: 250)),
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        return Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.symmetric(vertical: 0.0, horizontal: 24.0),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: <Widget>[
                  Text(
                    _timeString(position),
                    style: TextStyle(
                        fontSize: 14.0
                    ),
                  ),
                  Text(
                    _timeString(duration),
                    style: TextStyle(
                        fontSize: 14.0
                    ),
                  )
                ],
              ),
            ),
            Container(
              height: 32.0,
              child: Slider(
                value: position,
                max: duration,
                onChangeStart: (double d) {
                  setState(() {
                    _seeking = true;
                    _pos = d;
                  });
                },
                onChanged: (double d) {
                  setState(() {
                    _pos = d;
                  });
                },
                onChangeEnd: (double d) async {
                  await AudioService.seekTo(Duration(milliseconds: d.round()));
                  setState(() {
                    _pos = d;
                    _seeking = false;
                  });
                },
              ),
            )
          ],
        );
      },
    );
  }
}

class QueueScreen extends StatefulWidget {
  @override
  _QueueScreenState createState() => _QueueScreenState();
}

class _QueueScreenState extends State<QueueScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Queue'),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.shuffle),
              onPressed: () async {
                await AudioService.customAction('shuffleQueue');
                setState(() => {});
              },
            )
          ],
        ),
        body: ListView.builder(
          itemCount: AudioService.queue.length,
          itemBuilder: (context, i) {
            Track t = Track.fromMediaItem(AudioService.queue[i]);
            return TrackTile(
              t,
              onTap: () async {
                await AudioService.playFromMediaId(t.id);
                Navigator.of(context).pop();
              },
              onHold: () {
                MenuSheet m = MenuSheet(context);
                m.defaultTrackMenu(t);
              },
            );
          },
        )
    );
  }
}