part of '../../../main.dart';

class CameraStreamView extends StatefulWidget {

  final bool withControls;

  CameraStreamView({Key key, this.withControls: true}) : super(key: key);

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

class _CameraStreamViewState extends State<CameraStreamView> {

  CameraEntity _entity;
  String _streamUrl = "";
  VideoPlayerController _videoPlayerController;
  Timer _monitorTimer;
  bool _isLoaded = false;
  double _aspectRatio = 1.33;
  String _webViewHtml;
  String _jsMessageChannelName = 'unknown';
  Completer _loading;

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

  Future _loadResources() {
    if (_loading != null && !_loading.isCompleted) {
      Logger.d("[Camera Player] Resources loading is not finished yet");
      return _loading.future;  
    }
    Logger.d("[Camera Player] Loading resources");
    _loading = Completer();
    _entity = EntityModel
          .of(context)
          .entityWrapper
          .entity;
    if (_entity.supportStream) {
      HomeAssistant().getCameraStream(_entity.entityId)
        .then((data) {
          if (_videoPlayerController != null) {
            _videoPlayerController.dispose().then((_) => createPlayer(data));
          } else {
            createPlayer(data);
          }
        })
        .catchError((e) {
          _loading.completeError(e);
          Logger.e("[Camera Player] $e");
        });
    } else {
      _streamUrl = '${ConnectionManager().httpWebHost}/api/camera_proxy_stream/${_entity
          .entityId}?token=${_entity.attributes['access_token']}';
      _jsMessageChannelName = 'HA_${_entity.entityId.replaceAll('.', '_')}';
      rootBundle.loadString('assets/html/cameraView.html').then((file) {
        _webViewHtml = Uri.dataFromString(
            file.replaceFirst('{{stream_url}}', _streamUrl).replaceFirst('{{message_channel}}', _jsMessageChannelName),
            mimeType: 'text/html',
            encoding: Encoding.getByName('utf-8')
        ).toString();
        _loading.complete();
      });
    }
    return _loading.future;
  }

  void createPlayer(data) {
    _videoPlayerController = VideoPlayerController.network("${ConnectionManager().httpWebHost}${data["url"]}");
    _videoPlayerController.initialize().then((_) {
      setState((){
        _aspectRatio = _videoPlayerController.value.aspectRatio;
      });
      _loading.complete();
      autoPlay();
      startMonitor();
    }).catchError((e) {
      _loading.completeError(e);
      Logger.e("[Camera Player] Error player init. Retrying");
      _loadResources();
    });
  }

  void autoPlay() {
    if (!_videoPlayerController.value.isPlaying) {
      _videoPlayerController.play();
    }
  }

  void startMonitor() {
    _monitorTimer?.cancel();
    _monitorTimer = Timer.periodic(Duration(milliseconds: 500), (timer) {
      if (_videoPlayerController.value.hasError) {
        timer.cancel();
        setState(() {
          _isLoaded = false;  
        });
      }
    });
  }

  Widget _buildScreen() {
    Widget screenWidget;
    if (!_isLoaded) {
      screenWidget = Center(
        child: EntityPicture()
      );
    } else if (_entity.supportStream) {
      if (_videoPlayerController.value.initialized) {
        screenWidget = VideoPlayer(_videoPlayerController);
      } else {
        screenWidget = Center(
          child: EntityPicture()
        );
      }
    } else {
      screenWidget = WebView(
        initialUrl: _webViewHtml,
        initialMediaPlaybackPolicy: AutoMediaPlaybackPolicy.always_allow,
        debuggingEnabled: Logger.isInDebugMode,
        gestureNavigationEnabled: false,
        javascriptMode: JavascriptMode.unrestricted,
        javascriptChannels: {
          JavascriptChannel(
            name: _jsMessageChannelName,
            onMessageReceived: ((message) {
              setState((){
                _aspectRatio = double.tryParse(message.message) ?? 1.33;
              });
            })
          )
        }
      );
    }
    return AspectRatio(
      aspectRatio: _aspectRatio,
      child: screenWidget
    );
  }

  Widget _buildControls() {
    Widget playControl;
      if (_entity.supportStream) {
        playControl = Center(
          child: IconButton(
            icon: Icon((_videoPlayerController != null && _videoPlayerController.value.isPlaying) ? Icons.pause_circle_outline : Icons.play_circle_outline),
            iconSize: 60,
            color: Colors.amberAccent,
            onPressed: (_videoPlayerController == null || _videoPlayerController.value.hasError || !_isLoaded) ? null :
              () {
                setState(() {
                  if (_videoPlayerController != null && _videoPlayerController.value.isPlaying) {
                    _videoPlayerController.pause();
                  } else {
                    _videoPlayerController.play();
                  }
                });
              },
          ),
        );
      } else {
        playControl = Container();
      }
      return Row(
        mainAxisSize: MainAxisSize.max,
        crossAxisAlignment: CrossAxisAlignment.center,
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          IconButton(
            icon: Icon(Icons.refresh),
            iconSize: 40,
            color: Colors.amberAccent,
            onPressed: _isLoaded ? () {
              setState(() {
                _isLoaded = false;  
              });
            } : null,
          ),
          Expanded(
            child: playControl,
          ),
          IconButton(
            icon: Icon(Icons.fullscreen),
            iconSize: 40,
            color: Colors.amberAccent,
            onPressed: _isLoaded ? () {
              _videoPlayerController?.pause();
              eventBus.fire(ShowEntityPageEvent());
              Navigator.of(context).push(
                MaterialPageRoute(
                  builder: (conext) => FullScreenPage(
                    child: EntityModel(
                      child: CameraStreamView(
                        withControls: false
                      ),
                      handleTap: false,
                      entityWrapper: EntityWrapper(
                        entity: _entity
                      ),
                    ),
                  ),
                  fullscreenDialog: true
                )
              ).then((_) {
                eventBus.fire(ShowEntityPageEvent(entity: _entity));
              });
            } : null,
          )
        ],
      );
  }

  @override
  Widget build(BuildContext context) {
    if (!_isLoaded && (_loading == null || _loading.isCompleted)) {
      _loadResources().then((_) => setState((){ _isLoaded = true; }));
    }
    if (widget.withControls) {
      return Card(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            _buildScreen(),
            _buildControls()
          ],
        ),
      );
    } else {
      return _buildScreen();
    }
    
  }

  @override
  void dispose() {
    _monitorTimer?.cancel();
    _videoPlayerController?.dispose();
    super.dispose();
  }
}