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

import 'package:chewie_example/material_progress_bar.dart';
import 'package:chewie_example/utils.dart';
import 'package:flutter/material.dart';
import 'package:meta/meta.dart';
import 'package:video_player/video_player.dart';

class MaterialControls extends StatefulWidget {
  final VideoPlayerController controller;
  final bool fullScreen;
  final Future<dynamic> Function() onExpandCollapse;

  MaterialControls({
    @required this.controller,
    @required this.fullScreen,
    @required this.onExpandCollapse,
  });

  @override
  State<StatefulWidget> createState() {
    return new _MaterialControlsState();
  }
}

class _MaterialControlsState extends State<MaterialControls> {
  VideoPlayerValue _latestValue;
  double _latestVolume;
  bool _hideStuff = true;
  bool _disposed = false;
  Timer _hideTimer;
  bool _dragging = false;

  final barHeight = 48.0;
  final marginSize = 5.0;

  @override
  Widget build(BuildContext context) {
    final controller = widget.controller;

    return new Column(
      children: <Widget>[
        _buildHitArea(),
        _buildBottomBar(context, controller),
      ],
    );
  }

  @override
  void dispose() {
    widget.controller.removeListener(_updateState);
    _disposed = true;
    super.dispose();
  }

  @override
  void initState() {
    _initialize();

    super.initState();
  }

  AnimatedOpacity _buildBottomBar(
    BuildContext context,
    VideoPlayerController controller,
  ) {
    final iconColor = Theme.of(context).textTheme.button.color;

    return new AnimatedOpacity(
      opacity: _hideStuff ? 0.0 : 1.0,
      duration: new Duration(milliseconds: 300),
      child: new Container(
        height: barHeight,
        color: Theme.of(context).dialogBackgroundColor,
        child: new Row(
          children: <Widget>[
            _buildPlayPause(controller),
            _buildPosition(iconColor),
            _buildProgressBar(),
            _buildMuteButton(controller),
            _buildExpandButton(),
          ],
        ),
      ),
    );
  }

  GestureDetector _buildExpandButton() {
    return new GestureDetector(
      onTap: _onExpandCollapse,
      child: new AnimatedOpacity(
        opacity: _hideStuff ? 0.0 : 1.0,
        duration: new Duration(milliseconds: 300),
        child: new Container(
          height: barHeight,
          margin: new EdgeInsets.only(right: 12.0),
          padding: new EdgeInsets.only(
            left: 8.0,
            right: 8.0,
          ),
          child: new Center(
            child: new Icon(
              widget.fullScreen ? Icons.fullscreen_exit : Icons.fullscreen,
            ),
          ),
        ),
      ),
    );
  }

  Expanded _buildHitArea() {
    return new Expanded(
      child: new GestureDetector(
        onTap: _latestValue != null && _latestValue.isPlaying
            ? _cancelAndRestartTimer
            : () {
                widget.controller.play();

                setState(() {
                  _hideStuff = true;
                });
              },
        child: new Container(
          color: Colors.transparent,
          child: new Center(
            child: new AnimatedOpacity(
              opacity:
                  _latestValue != null && !_latestValue.isPlaying && !_dragging
                      ? 1.0
                      : 0.0,
              duration: new Duration(milliseconds: 300),
              child: new GestureDetector(
                child: new Container(
                  decoration: new BoxDecoration(
                    color: Theme.of(context).dialogBackgroundColor,
                    borderRadius: new BorderRadius.circular(48.0),
                  ),
                  child: new Padding(
                    padding: new EdgeInsets.all(12.0),
                    child: new Icon(Icons.play_arrow, size: 32.0),
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }

  GestureDetector _buildMuteButton(
    VideoPlayerController controller,
  ) {
    return new GestureDetector(
      onTap: () {
        _cancelAndRestartTimer();

        if (_latestValue.volume == 0) {
          controller.setVolume(_latestVolume ?? 0.5);
        } else {
          _latestVolume = controller.value.volume;
          controller.setVolume(0.0);
        }
      },
      child: new AnimatedOpacity(
        opacity: _hideStuff ? 0.0 : 1.0,
        duration: new Duration(milliseconds: 300),
        child: new ClipRect(
          child: new Container(
            child: new Container(
              height: barHeight,
              padding: new EdgeInsets.only(
                left: 8.0,
                right: 8.0,
              ),
              child: new Icon(
                (_latestValue != null && _latestValue.volume > 0)
                    ? Icons.volume_up
                    : Icons.volume_off,
              ),
            ),
          ),
        ),
      ),
    );
  }

  GestureDetector _buildPlayPause(VideoPlayerController controller) {
    return new GestureDetector(
      onTap: _playPause,
      child: new Container(
        height: barHeight,
        color: Colors.transparent,
        margin: new EdgeInsets.only(left: 8.0, right: 4.0),
        padding: new EdgeInsets.only(
          left: 12.0,
          right: 12.0,
        ),
        child: new Icon(
          controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }

  Widget _buildPosition(Color iconColor) {
    final position = _latestValue != null && _latestValue.position != null
        ? _latestValue.position
        : Duration.zero;
    final duration = _latestValue != null && _latestValue.duration != null
        ? _latestValue.duration
        : Duration.zero;

    return new Padding(
      padding: new EdgeInsets.only(right: 24.0),
      child: new Text(
        '${formatDuration(position)} / ${formatDuration(duration)}',
        style: new TextStyle(
          fontSize: 14.0,
        ),
      ),
    );
  }

  _cancelAndRestartTimer() {
    _hideTimer?.cancel();

    setState(() {
      _hideStuff = false;

      _startHideTimer();
    });
  }

  Future<Null> _initialize() async {
    widget.controller.addListener(_updateState);

    _updateState();

    _startHideTimer();

    new Timer(new Duration(milliseconds: 200), () {
      setState(() {
        _hideStuff = false;
      });
    });
  }

  void _onExpandCollapse() {
    setState(() {
      _hideStuff = true;

      widget.onExpandCollapse().then((_) {
        new Timer(new Duration(milliseconds: 300), () {
          if (!_disposed) {
            setState(() {
              _cancelAndRestartTimer();
            });
          }
        });
      });
    });
  }

  void _playPause() {
    setState(() {
      if (widget.controller.value.isPlaying) {
        _hideStuff = false;
        _hideTimer?.cancel();
        widget.controller.pause();
      } else {
        _cancelAndRestartTimer();
        widget.controller.play();
      }
    });
  }

  void _startHideTimer() {
    _hideTimer = new Timer(const Duration(seconds: 3), () {
      if (!_disposed) {
        setState(() {
          _hideStuff = true;
        });
      }
    });
  }

  void _updateState() {
    setState(() {
      _latestValue = widget.controller.value;
    });
  }

  Widget _buildProgressBar() {
    return new Expanded(
      child: new Padding(
        padding: new EdgeInsets.only(right: 20.0),
        child: new MaterialVideoProgressBar(
          widget.controller,
          onDragStart: () {
            setState(() {
              _dragging = true;
            });

            _hideTimer?.cancel();
          },
          onDragEnd: () {
            setState(() {
              _dragging = false;
            });

            _startHideTimer();
          },
          colors: new VideoProgressColors(
              playedColor: Theme.of(context).accentColor,
              handleColor: Theme.of(context).accentColor,
              bufferedColor: Theme.of(context).backgroundColor,
              disabledColor: Theme.of(context).disabledColor),
        ),
      ),
    );
  }
}