import protooClient from 'protoo-client';
import * as mediasoupClient from 'mediasoup-client';
import Logger from './Logger';
import { getProtooUrl } from './urlFactory';
import * as cookiesManager from './cookiesManager';
import * as requestActions from './redux/requestActions';
import * as stateActions from './redux/stateActions';
import * as e2e from './e2e';

const VIDEO_CONSTRAINS =
{
	qvga : { width: { ideal: 320 }, height: { ideal: 240 } },
	vga  : { width: { ideal: 640 }, height: { ideal: 480 } },
	hd   : { width: { ideal: 1280 }, height: { ideal: 720 } }
};

const PC_PROPRIETARY_CONSTRAINTS =
{
	// optional : [ { googDscp: true } ]
};

const EXTERNAL_VIDEO_SRC = '/resources/videos/video-audio-stereo.mp4';

const logger = new Logger('RoomClient');

let store;

export default class RoomClient
{
	/**
	 * @param  {Object} data
	 * @param  {Object} data.store - The Redux store.
	 */
	static init(data)
	{
		store = data.store;
	}

	constructor(
		{
			roomId,
			peerId,
			displayName,
			device,
			handlerName,
			forceTcp,
			produce,
			consume,
			datachannel,
			enableWebcamLayers,
			enableSharingLayers,
			webcamScalabilityMode,
			sharingScalabilityMode,
			numSimulcastStreams,
			forceVP8,
			forceH264,
			forceVP9,
			externalVideo,
			e2eKey,
			consumerReplicas
		}
	)
	{
		logger.debug(
			'constructor() [roomId:"%s", peerId:"%s", displayName:"%s", device:%s]',
			roomId, peerId, displayName, device.flag);

		// Closed flag.
		// @type {Boolean}
		this._closed = false;

		// Display name.
		// @type {String}
		this._displayName = displayName;

		// Device info.
		// @type {Object}
		this._device = device;

		// Custom mediasoup-client handler name (to override default browser
		// detection if desired).
		// @type {String}
		this._handlerName = handlerName;

		// Whether we want to force RTC over TCP.
		// @type {Boolean}
		this._forceTcp = forceTcp;

		// Whether we want to produce audio/video.
		// @type {Boolean}
		this._produce = produce;

		// Whether we should consume.
		// @type {Boolean}
		this._consume = consume;

		// Whether we want DataChannels.
		// @type {Boolean}
		this._useDataChannel = Boolean(datachannel);

		// Force VP8 codec for sending.
		// @type {Boolean}
		this._forceVP8 = Boolean(forceVP8);

		// Force H264 codec for sending.
		// @type {Boolean}
		this._forceH264 = Boolean(forceH264);

		// Force VP9 codec for sending.
		// @type {Boolean}
		this._forceVP9 = Boolean(forceVP9);

		// Whether simulcast or SVC should be used for webcam.
		// @type {Boolean}
		this._enableWebcamLayers = Boolean(enableWebcamLayers);

		// Whether simulcast or SVC should be used in desktop sharing.
		// @type {Boolean}
		this._enableSharingLayers = Boolean(enableSharingLayers);

		// Scalability mode for webcam.
		// @type {String}
		this._webcamScalabilityMode = webcamScalabilityMode;

		// Scalability mode for sharing.
		// @type {String}
		this._sharingScalabilityMode = sharingScalabilityMode;

		// Number of simuclast streams for webcam and sharing.
		// @type {Number}
		this._numSimulcastStreams = numSimulcastStreams;

		// External video.
		// @type {HTMLVideoElement}
		this._externalVideo = null;

		// Enabled end-to-end encryption.
		this._e2eKey = e2eKey;

		// MediaStream of the external video.
		// @type {MediaStream}
		this._externalVideoStream = null;

		// Next expected dataChannel test number.
		// @type {Number}
		this._nextDataChannelTestNumber = 0;

		if (externalVideo)
		{
			this._externalVideo = document.createElement('video');

			this._externalVideo.controls = true;
			this._externalVideo.muted = true;
			this._externalVideo.loop = true;
			this._externalVideo.setAttribute('playsinline', '');
			this._externalVideo.src = EXTERNAL_VIDEO_SRC;

			this._externalVideo.play()
				.catch((error) => logger.warn('externalVideo.play() failed:%o', error));
		}

		// Protoo URL.
		// @type {String}
		this._protooUrl = getProtooUrl({ roomId, peerId, consumerReplicas });

		// protoo-client Peer instance.
		// @type {protooClient.Peer}
		this._protoo = null;

		// mediasoup-client Device instance.
		// @type {mediasoupClient.Device}
		this._mediasoupDevice = null;

		// mediasoup Transport for sending.
		// @type {mediasoupClient.Transport}
		this._sendTransport = null;

		// mediasoup Transport for receiving.
		// @type {mediasoupClient.Transport}
		this._recvTransport = null;

		// Local mic mediasoup Producer.
		// @type {mediasoupClient.Producer}
		this._micProducer = null;

		// Local webcam mediasoup Producer.
		// @type {mediasoupClient.Producer}
		this._webcamProducer = null;

		// Local share mediasoup Producer.
		// @type {mediasoupClient.Producer}
		this._shareProducer = null;

		// Local chat DataProducer.
		// @type {mediasoupClient.DataProducer}
		this._chatDataProducer = null;

		// Local bot DataProducer.
		// @type {mediasoupClient.DataProducer}
		this._botDataProducer = null;

		// mediasoup Consumers.
		// @type {Map<String, mediasoupClient.Consumer>}
		this._consumers = new Map();

		// mediasoup DataConsumers.
		// @type {Map<String, mediasoupClient.DataConsumer>}
		this._dataConsumers = new Map();

		// Map of webcam MediaDeviceInfos indexed by deviceId.
		// @type {Map<String, MediaDeviceInfos>}
		this._webcams = new Map();

		// Local Webcam.
		// @type {Object} with:
		// - {MediaDeviceInfo} [device]
		// - {String} [resolution] - 'qvga' / 'vga' / 'hd'.
		this._webcam =
		{
			device     : null,
			resolution : 'hd'
		};

		if (this._e2eKey && e2e.isSupported())
		{
			e2e.setCryptoKey('setCryptoKey', this._e2eKey, true);
		}
	}

	close()
	{
		if (this._closed)
			return;

		this._closed = true;

		logger.debug('close()');

		// Close protoo Peer
		this._protoo.close();

		// Close mediasoup Transports.
		if (this._sendTransport)
			this._sendTransport.close();

		if (this._recvTransport)
			this._recvTransport.close();

		store.dispatch(
			stateActions.setRoomState('closed'));
	}

	async join()
	{
		store.dispatch(
			stateActions.setMediasoupClientVersion(mediasoupClient.version));

		const protooTransport = new protooClient.WebSocketTransport(this._protooUrl);

		this._protoo = new protooClient.Peer(protooTransport);

		store.dispatch(
			stateActions.setRoomState('connecting'));

		this._protoo.on('open', () => this._joinRoom());

		this._protoo.on('failed', () =>
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : 'WebSocket连接失败'
				}));
		});

		this._protoo.on('disconnected', () =>
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : 'WebSocket已断开连接'
				}));

			// Close mediasoup Transports.
			if (this._sendTransport)
			{
				this._sendTransport.close();
				this._sendTransport = null;
			}

			if (this._recvTransport)
			{
				this._recvTransport.close();
				this._recvTransport = null;
			}

			store.dispatch(
				stateActions.setRoomState('closed'));
		});

		this._protoo.on('close', () =>
		{
			if (this._closed)
				return;

			this.close();
		});

		// eslint-disable-next-line no-unused-vars
		this._protoo.on('request', async (request, accept, reject) =>
		{
			logger.debug(
				'proto "request" event [method:%s, data:%o]',
				request.method, request.data);

			switch (request.method)
			{
				case 'newConsumer':
				{
					if (!this._consume)
					{
						reject(403, 'I do not want to consume');

						break;
					}

					const {
						peerId,
						producerId,
						id,
						kind,
						rtpParameters,
						type,
						appData,
						producerPaused
					} = request.data;

					try
					{
						const consumer = await this._recvTransport.consume(
							{
								id,
								producerId,
								kind,
								rtpParameters,
								// NOTE: Force streamId to be same in mic and webcam and different
								// in screen sharing so libwebrtc will just try to sync mic and
								// webcam streams from the same remote peer.
								streamId : `${peerId}-${appData.share ? 'share' : 'mic-webcam'}`,
								appData  : { ...appData, peerId } // Trick.
							});

						if (this._e2eKey && e2e.isSupported())
						{
							e2e.setupReceiverTransform(consumer.rtpReceiver);
						}

						// Store in the map.
						this._consumers.set(consumer.id, consumer);

						consumer.on('transportclose', () =>
						{
							this._consumers.delete(consumer.id);
						});

						const { spatialLayers, temporalLayers } =
							mediasoupClient.parseScalabilityMode(
								consumer.rtpParameters.encodings[0].scalabilityMode);

						store.dispatch(stateActions.addConsumer(
							{
								id                     : consumer.id,
								type                   : type,
								locallyPaused          : false,
								remotelyPaused         : producerPaused,
								rtpParameters          : consumer.rtpParameters,
								spatialLayers          : spatialLayers,
								temporalLayers         : temporalLayers,
								preferredSpatialLayer  : spatialLayers - 1,
								preferredTemporalLayer : temporalLayers - 1,
								priority               : 1,
								codec                  : consumer.rtpParameters.codecs[0].mimeType.split('/')[1],
								track                  : consumer.track
							},
							peerId));

						// We are ready. Answer the protoo request so the server will
						// resume this Consumer (which was paused for now if video).
						accept();

						// If audio-only mode is enabled, pause it.
						if (consumer.kind === 'video' && store.getState().me.audioOnly)
							this._pauseConsumer(consumer);
					}
					catch (error)
					{
						logger.error('"newConsumer" request failed:%o', error);

						store.dispatch(requestActions.notify(
							{
								type : 'error',
								text : `创建用户时出错: ${error}`
							}));

						throw error;
					}

					break;
				}

				case 'newDataConsumer':
				{
					if (!this._consume)
					{
						reject(403, 'I do not want to data consume');

						break;
					}

					if (!this._useDataChannel)
					{
						reject(403, 'I do not want DataChannels');

						break;
					}

					const {
						peerId, // NOTE: Null if bot.
						dataProducerId,
						id,
						sctpStreamParameters,
						label,
						protocol,
						appData
					} = request.data;

					try
					{
						const dataConsumer = await this._recvTransport.consumeData(
							{
								id,
								dataProducerId,
								sctpStreamParameters,
								label,
								protocol,
								appData : { ...appData, peerId } // Trick.
							});

						// Store in the map.
						this._dataConsumers.set(dataConsumer.id, dataConsumer);

						dataConsumer.on('transportclose', () =>
						{
							this._dataConsumers.delete(dataConsumer.id);
						});

						dataConsumer.on('open', () =>
						{
							logger.debug('DataConsumer "open" event');
						});

						dataConsumer.on('close', () =>
						{
							logger.warn('DataConsumer "close" event');

							this._dataConsumers.delete(dataConsumer.id);

							store.dispatch(requestActions.notify(
								{
									type : 'error',
									text : 'DataConsumer 已关闭'
								}));
						});

						dataConsumer.on('error', (error) =>
						{
							logger.error('DataConsumer "error" event:%o', error);

							store.dispatch(requestActions.notify(
								{
									type : 'error',
									text : `DataConsumer 错误: ${error}`
								}));
						});

						dataConsumer.on('message', (message) =>
						{
							logger.debug(
								'DataConsumer "message" event [streamId:%d]',
								dataConsumer.sctpStreamParameters.streamId);

							// TODO: For debugging.
							window.DC_MESSAGE = message;

							if (message instanceof ArrayBuffer)
							{
								const view = new DataView(message);
								const number = view.getUint32();

								if (number == Math.pow(2, 32) - 1)
								{
									logger.warn('dataChannelTest finished!');

									this._nextDataChannelTestNumber = 0;

									return;
								}

								if (number > this._nextDataChannelTestNumber)
								{
									logger.warn(
										'dataChannelTest: %s packets missing',
										number - this._nextDataChannelTestNumber);
								}

								this._nextDataChannelTestNumber = number + 1;

								return;
							}
							else if (typeof message !== 'string')
							{
								logger.warn('ignoring DataConsumer "message" (not a string)');

								return;
							}

							switch (dataConsumer.label)
							{
								case 'chat':
								{
									const { peers } = store.getState();
									const peersArray = Object.keys(peers)
										.map((_peerId) => peers[_peerId]);
									const sendingPeer = peersArray
										.find((peer) => peer.dataConsumers.includes(dataConsumer.id));

									if (!sendingPeer)
									{
										logger.warn('DataConsumer "message" from unknown peer');

										break;
									}

									store.dispatch(requestActions.notify(
										{
											type	: 'userMessage',
											title   : `${sendingPeer.displayName} says:`,
											text    : message,
											timeout : 5000
										}));

									break;
								}

								case 'bot':
								{
									store.dispatch(requestActions.notify(
										{
											title   : 'Message from Bot:',
											text    : message,
											timeout : 5000
										}));

									break;
								}
							}
						});

						// TODO: REMOVE
						window.DC = dataConsumer;

						store.dispatch(stateActions.addDataConsumer(
							{
								id                   : dataConsumer.id,
								sctpStreamParameters : dataConsumer.sctpStreamParameters,
								label                : dataConsumer.label,
								protocol             : dataConsumer.protocol
							},
							peerId));

						// We are ready. Answer the protoo request.
						accept();
					}
					catch (error)
					{
						logger.error('"newDataConsumer" request failed:%o', error);

						store.dispatch(requestActions.notify(
							{
								type : 'error',
								text : `创建DataConsumer时出错: ${error}`
							}));

						throw error;
					}

					break;
				}
			}
		});

		this._protoo.on('notification', (notification) =>
		{
			logger.debug(
				'proto "notification" event [method:%s, data:%o]',
				notification.method, notification.data);

			switch (notification.method)
			{
				case 'mediasoup-version':
				{
					const { version } = notification.data;

					store.dispatch(
						stateActions.setMediasoupVersion(version));

					break;
				}

				case 'producerScore':
				{
					const { producerId, score } = notification.data;

					store.dispatch(
						stateActions.setProducerScore(producerId, score));

					break;
				}

				case 'newPeer':
				{
					const peer = notification.data;

					store.dispatch(
						stateActions.addPeer(
							{ ...peer, consumers: [], dataConsumers: [] }));

					store.dispatch(requestActions.notify(
						{
							text : `${peer.displayName} 加入房间`
						}));

					break;
				}

				case 'peerClosed':
				{
					const { peerId } = notification.data;

					store.dispatch(
						stateActions.removePeer(peerId));

					break;
				}

				case 'peerDisplayNameChanged':
				{
					const { peerId, displayName, oldDisplayName } = notification.data;

					store.dispatch(
						stateActions.setPeerDisplayName(displayName, peerId));

					store.dispatch(requestActions.notify(
						{
							text : `${oldDisplayName} is now ${displayName}`
						}));

					break;
				}

				case 'downlinkBwe':
				{
					logger.debug('\'downlinkBwe\' event:%o', notification.data);

					break;
				}

				case 'consumerClosed':
				{
					const { consumerId } = notification.data;
					const consumer = this._consumers.get(consumerId);

					if (!consumer)
						break;

					consumer.close();
					this._consumers.delete(consumerId);

					const { peerId } = consumer.appData;

					store.dispatch(
						stateActions.removeConsumer(consumerId, peerId));

					break;
				}

				case 'consumerPaused':
				{
					const { consumerId } = notification.data;
					const consumer = this._consumers.get(consumerId);

					if (!consumer)
						break;

					consumer.pause();

					store.dispatch(
						stateActions.setConsumerPaused(consumerId, 'remote'));

					break;
				}

				case 'consumerResumed':
				{
					const { consumerId } = notification.data;
					const consumer = this._consumers.get(consumerId);

					if (!consumer)
						break;

					consumer.resume();

					store.dispatch(
						stateActions.setConsumerResumed(consumerId, 'remote'));

					break;
				}

				case 'consumerLayersChanged':
				{
					const { consumerId, spatialLayer, temporalLayer } = notification.data;
					const consumer = this._consumers.get(consumerId);

					if (!consumer)
						break;

					store.dispatch(stateActions.setConsumerCurrentLayers(
						consumerId, spatialLayer, temporalLayer));

					break;
				}

				case 'consumerScore':
				{
					const { consumerId, score } = notification.data;

					store.dispatch(
						stateActions.setConsumerScore(consumerId, score));

					break;
				}

				case 'dataConsumerClosed':
				{
					const { dataConsumerId } = notification.data;
					const dataConsumer = this._dataConsumers.get(dataConsumerId);

					if (!dataConsumer)
						break;

					dataConsumer.close();
					this._dataConsumers.delete(dataConsumerId);

					const { peerId } = dataConsumer.appData;

					store.dispatch(
						stateActions.removeDataConsumer(dataConsumerId, peerId));

					break;
				}

				case 'activeSpeaker':
				{
					const { peerId } = notification.data;

					store.dispatch(
						stateActions.setRoomActiveSpeaker(peerId));

					break;
				}

				default:
				{
					logger.error(
						'unknown protoo notification.method "%s"', notification.method);
				}
			}
		});
	}

	async enableMic()
	{
		logger.debug('enableMic()');

		if (this._micProducer)
			return;

		if (!this._mediasoupDevice.canProduce('audio'))
		{
			logger.error('enableMic() | cannot produce audio');

			return;
		}

		let track;

		try
		{
			if (!this._externalVideo)
			{
				logger.debug('enableMic() | calling getUserMedia()');

				const stream = await navigator.mediaDevices.getUserMedia({ audio: true });

				track = stream.getAudioTracks()[0];
			}
			else
			{
				const stream = await this._getExternalVideoStream();

				track = stream.getAudioTracks()[0].clone();
			}

			this._micProducer = await this._sendTransport.produce(
				{
					track,
					codecOptions :
					{
						opusStereo : true,
						opusDtx    : true,
						opusFec    : true,
						opusNack   : true
					}
					// NOTE: for testing codec selection.
					// codec : this._mediasoupDevice.rtpCapabilities.codecs
					// 	.find((codec) => codec.mimeType.toLowerCase() === 'audio/pcma')
				});

			if (this._e2eKey && e2e.isSupported())
			{
				e2e.setupSenderTransform(this._micProducer.rtpSender);
			}

			store.dispatch(stateActions.addProducer(
				{
					id            : this._micProducer.id,
					paused        : this._micProducer.paused,
					track         : this._micProducer.track,
					rtpParameters : this._micProducer.rtpParameters,
					codec         : this._micProducer.rtpParameters.codecs[0].mimeType.split('/')[1]
				}));

			this._micProducer.on('transportclose', () =>
			{
				this._micProducer = null;
			});

			this._micProducer.on('trackended', () =>
			{
				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : '麦克风断开！'
					}));

				this.disableMic()
					.catch(() => {});
			});
		}
		catch (error)
		{
			logger.error('enableMic() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `启用麦克风时出错: ${error}`
				}));

			if (track)
				track.stop();
		}
	}

	async disableMic()
	{
		logger.debug('disableMic()');

		if (!this._micProducer)
			return;

		this._micProducer.close();

		store.dispatch(
			stateActions.removeProducer(this._micProducer.id));

		try
		{
			await this._protoo.request(
				'closeProducer', { producerId: this._micProducer.id });
		}
		catch (error)
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `关闭服务器端麦克风生成器时出错: ${error}`
				}));
		}

		this._micProducer = null;
	}

	async muteMic()
	{
		logger.debug('muteMic()');

		this._micProducer.pause();

		try
		{
			await this._protoo.request(
				'pauseProducer', { producerId: this._micProducer.id });

			store.dispatch(
				stateActions.setProducerPaused(this._micProducer.id));
		}
		catch (error)
		{
			logger.error('muteMic() | failed: %o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `暂停服务器端麦克风生成器时出错: ${error}`
				}));
		}
	}

	async unmuteMic()
	{
		logger.debug('unmuteMic()');

		this._micProducer.resume();

		try
		{
			await this._protoo.request(
				'resumeProducer', { producerId: this._micProducer.id });

			store.dispatch(
				stateActions.setProducerResumed(this._micProducer.id));
		}
		catch (error)
		{
			logger.error('unmuteMic() | failed: %o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `恢复服务器端麦克风生成器时出错: ${error}`
				}));
		}
	}

	async enableWebcam()
	{
		logger.debug('enableWebcam()');

		if (this._webcamProducer)
			return;
		else if (this._shareProducer)
			await this.disableShare();

		if (!this._mediasoupDevice.canProduce('video'))
		{
			logger.error('enableWebcam() | cannot produce video');

			return;
		}

		let track;
		let device;

		store.dispatch(
			stateActions.setWebcamInProgress(true));

		try
		{
			if (!this._externalVideo)
			{
				await this._updateWebcams();
				device = this._webcam.device;

				const { resolution } = this._webcam;

				if (!device)
					throw new Error('no webcam devices');

				logger.debug('enableWebcam() | calling getUserMedia()');

				const stream = await navigator.mediaDevices.getUserMedia(
					{
						video :
						{
							deviceId : { ideal: device.deviceId },
							...VIDEO_CONSTRAINS[resolution]
						}
					});

				track = stream.getVideoTracks()[0];
			}
			else
			{
				device = { label: 'external video' };

				const stream = await this._getExternalVideoStream();

				track = stream.getVideoTracks()[0].clone();
			}

			let encodings;
			let codec;
			const codecOptions =
			{
				videoGoogleStartBitrate : 1000
			};

			if (this._forceVP8)
			{
				codec = this._mediasoupDevice.rtpCapabilities.codecs
					.find((c) => c.mimeType.toLowerCase() === 'video/vp8');

				if (!codec)
				{
					throw new Error('desired VP8 codec+configuration is not supported');
				}
			}
			else if (this._forceH264)
			{
				codec = this._mediasoupDevice.rtpCapabilities.codecs
					.find((c) => c.mimeType.toLowerCase() === 'video/h264');

				if (!codec)
				{
					throw new Error('desired H264 codec+configuration is not supported');
				}
			}
			else if (this._forceVP9)
			{
				codec = this._mediasoupDevice.rtpCapabilities.codecs
					.find((c) => c.mimeType.toLowerCase() === 'video/vp9');

				if (!codec)
				{
					throw new Error('desired VP9 codec+configuration is not supported');
				}
			}

			if (this._enableWebcamLayers)
			{
				// If VP9 is the only available video codec then use SVC.
				const firstVideoCodec = this._mediasoupDevice
					.rtpCapabilities
					.codecs
					.find((c) => c.kind === 'video');

				// VP9 with SVC.
				if (
					(this._forceVP9 && codec) ||
					firstVideoCodec.mimeType.toLowerCase() === 'video/vp9'
				)
				{
					encodings =
					[
						{
							maxBitrate      : 5000000,
							scalabilityMode : this._webcamScalabilityMode || 'L3T3_KEY'
						}
					];
				}
				// VP8 or H264 with simulcast.
				else
				{
					encodings =
					[
						{
							scaleResolutionDownBy : 1,
							maxBitrate            : 5000000,
							scalabilityMode       : this._webcamScalabilityMode || 'L1T3'
						}
					];

					if (this._numSimulcastStreams > 1)
					{
						encodings.unshift(
							{
								scaleResolutionDownBy : 2,
								maxBitrate            : 1000000,
								scalabilityMode       : this._webcamScalabilityMode || 'L1T3'
							}
						);
					}

					if (this._numSimulcastStreams > 2)
					{
						encodings.unshift(
							{
								scaleResolutionDownBy : 4,
								maxBitrate            : 500000,
								scalabilityMode       : this._webcamScalabilityMode || 'L1T3'
							}
						);
					}
				}
			}

			this._webcamProducer = await this._sendTransport.produce(
				{
					track,
					encodings,
					codecOptions,
					codec
				});

			if (this._e2eKey && e2e.isSupported())
			{
				e2e.setupSenderTransform(this._webcamProducer.rtpSender);
			}

			store.dispatch(stateActions.addProducer(
				{
					id            : this._webcamProducer.id,
					deviceLabel   : device.label,
					type          : this._getWebcamType(device),
					paused        : this._webcamProducer.paused,
					track         : this._webcamProducer.track,
					rtpParameters : this._webcamProducer.rtpParameters,
					codec         : this._webcamProducer.rtpParameters.codecs[0].mimeType.split('/')[1]
				}));

			this._webcamProducer.on('transportclose', () =>
			{
				this._webcamProducer = null;
			});

			this._webcamProducer.on('trackended', () =>
			{
				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : '网络摄像头已断开连接！'
					}));

				this.disableWebcam()
					.catch(() => {});
			});
		}
		catch (error)
		{
			logger.error('enableWebcam() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `启用网络摄像头时出错: ${error}`
				}));

			if (track)
				track.stop();
		}

		store.dispatch(
			stateActions.setWebcamInProgress(false));
	}

	async disableWebcam()
	{
		logger.debug('disableWebcam()');

		if (!this._webcamProducer)
			return;

		this._webcamProducer.close();

		store.dispatch(
			stateActions.removeProducer(this._webcamProducer.id));

		try
		{
			await this._protoo.request(
				'closeProducer', { producerId: this._webcamProducer.id });
		}
		catch (error)
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `关闭服务器端网络摄像头生成器时出错: ${error}`
				}));
		}

		this._webcamProducer = null;
	}

	async changeWebcam()
	{
		logger.debug('changeWebcam()');

		store.dispatch(
			stateActions.setWebcamInProgress(true));

		try
		{
			await this._updateWebcams();

			const array = Array.from(this._webcams.keys());
			const len = array.length;
			const deviceId =
				this._webcam.device ? this._webcam.device.deviceId : undefined;
			let idx = array.indexOf(deviceId);

			if (idx < len - 1)
				idx++;
			else
				idx = 0;

			this._webcam.device = this._webcams.get(array[idx]);

			logger.debug(
				'changeWebcam() | new selected webcam [device:%o]',
				this._webcam.device);

			// Reset video resolution to HD.
			this._webcam.resolution = 'hd';

			if (!this._webcam.device)
				throw new Error('no webcam devices');

			// Closing the current video track before asking for a new one (mobiles do not like
			// having both front/back cameras open at the same time).
			this._webcamProducer.track.stop();

			logger.debug('changeWebcam() | calling getUserMedia()');

			const stream = await navigator.mediaDevices.getUserMedia(
				{
					video :
					{
						deviceId : { exact: this._webcam.device.deviceId },
						...VIDEO_CONSTRAINS[this._webcam.resolution]
					}
				});

			const track = stream.getVideoTracks()[0];

			await this._webcamProducer.replaceTrack({ track });

			store.dispatch(
				stateActions.setProducerTrack(this._webcamProducer.id, track));
		}
		catch (error)
		{
			logger.error('changeWebcam() | failed: %o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `无法更改网络摄像头: ${error}`
				}));
		}

		store.dispatch(
			stateActions.setWebcamInProgress(false));
	}

	async changeWebcamResolution()
	{
		logger.debug('changeWebcamResolution()');

		store.dispatch(
			stateActions.setWebcamInProgress(true));

		try
		{
			switch (this._webcam.resolution)
			{
				case 'qvga':
					this._webcam.resolution = 'vga';
					break;
				case 'vga':
					this._webcam.resolution = 'hd';
					break;
				case 'hd':
					this._webcam.resolution = 'qvga';
					break;
				default:
					this._webcam.resolution = 'hd';
			}

			logger.debug('changeWebcamResolution() | calling getUserMedia()');

			const stream = await navigator.mediaDevices.getUserMedia(
				{
					video :
					{
						deviceId : { exact: this._webcam.device.deviceId },
						...VIDEO_CONSTRAINS[this._webcam.resolution]
					}
				});

			const track = stream.getVideoTracks()[0];

			await this._webcamProducer.replaceTrack({ track });

			store.dispatch(
				stateActions.setProducerTrack(this._webcamProducer.id, track));
		}
		catch (error)
		{
			logger.error('changeWebcamResolution() | failed: %o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `无法更改网络摄像头分辨率: ${error}`
				}));
		}

		store.dispatch(
			stateActions.setWebcamInProgress(false));
	}

	async enableShare()
	{
		logger.debug('enableShare()');

		if (this._shareProducer)
			return;
		else if (this._webcamProducer)
			await this.disableWebcam();

		if (!this._mediasoupDevice.canProduce('video'))
		{
			logger.error('enableShare() | cannot produce video');

			return;
		}

		let track;

		store.dispatch(
			stateActions.setShareInProgress(true));

		try
		{
			logger.debug('enableShare() | calling getUserMedia()');

			const stream = await navigator.mediaDevices.getDisplayMedia(
				{
					audio : false,
					video :
					{
						displaySurface : 'monitor',
						logicalSurface : true,
						cursor         : true,
						width          : { max: 1920 },
						height         : { max: 1080 },
						frameRate      : { max: 30 }
					}
				});

			// May mean cancelled (in some implementations).
			if (!stream)
			{
				store.dispatch(
					stateActions.setShareInProgress(true));

				return;
			}

			track = stream.getVideoTracks()[0];

			let encodings;
			let codec;
			const codecOptions =
			{
				videoGoogleStartBitrate : 1000
			};

			if (this._forceVP8)
			{
				codec = this._mediasoupDevice.rtpCapabilities.codecs
					.find((c) => c.mimeType.toLowerCase() === 'video/vp8');

				if (!codec)
				{
					throw new Error('desired VP8 codec+configuration is not supported');
				}
			}
			else if (this._forceH264)
			{
				codec = this._mediasoupDevice.rtpCapabilities.codecs
					.find((c) => c.mimeType.toLowerCase() === 'video/h264');

				if (!codec)
				{
					throw new Error('desired H264 codec+configuration is not supported');
				}
			}
			else if (this._forceVP9)
			{
				codec = this._mediasoupDevice.rtpCapabilities.codecs
					.find((c) => c.mimeType.toLowerCase() === 'video/vp9');

				if (!codec)
				{
					throw new Error('desired VP9 codec+configuration is not supported');
				}
			}

			if (this._enableSharingLayers)
			{
				// If VP9 is the only available video codec then use SVC.
				const firstVideoCodec = this._mediasoupDevice
					.rtpCapabilities
					.codecs
					.find((c) => c.kind === 'video');

				// VP9 with SVC.
				if (
					(this._forceVP9 && codec) ||
					firstVideoCodec.mimeType.toLowerCase() === 'video/vp9'
				)
				{
					encodings =
					[
						{
							maxBitrate      : 5000000,
							scalabilityMode : this._sharingScalabilityMode || 'L3T3',
							dtx             : true
						}
					];
				}
				// VP8 or H264 with simulcast.
				else
				{
					encodings =
					[
						{
							scaleResolutionDownBy : 1,
							maxBitrate            : 5000000,
							scalabilityMode       : this._sharingScalabilityMode || 'L1T3',
							dtx                   : true
						}
					];

					if (this._numSimulcastStreams > 1)
					{
						encodings.unshift(
							{
								scaleResolutionDownBy : 2,
								maxBitrate            : 1000000,
								scalabilityMode       : this._sharingScalabilityMode || 'L1T3',
								dtx                   : true
							}
						);
					}

					if (this._numSimulcastStreams > 2)
					{
						encodings.unshift(
							{
								scaleResolutionDownBy : 4,
								maxBitrate            : 500000,
								scalabilityMode       : this._sharingScalabilityMode || 'L1T3',
								dtx                   : true
							}
						);
					}
				}
			}

			this._shareProducer = await this._sendTransport.produce(
				{
					track,
					encodings,
					codecOptions,
					codec,
					appData :
					{
						share : true
					}
				});

			if (this._e2eKey && e2e.isSupported())
			{
				e2e.setupSenderTransform(this._shareProducer.rtpSender);
			}

			store.dispatch(stateActions.addProducer(
				{
					id            : this._shareProducer.id,
					type          : 'share',
					paused        : this._shareProducer.paused,
					track         : this._shareProducer.track,
					rtpParameters : this._shareProducer.rtpParameters,
					codec         : this._shareProducer.rtpParameters.codecs[0].mimeType.split('/')[1]
				}));

			this._shareProducer.on('transportclose', () =>
			{
				this._shareProducer = null;
			});

			this._shareProducer.on('trackended', () =>
			{
				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : '共享已断开连接！'
					}));

				this.disableShare()
					.catch(() => {});
			});
		}
		catch (error)
		{
			logger.error('enableShare() | failed:%o', error);

			if (error.name !== 'NotAllowedError')
			{
				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : `共享错误: ${error}`
					}));
			}

			if (track)
				track.stop();
		}

		store.dispatch(
			stateActions.setShareInProgress(false));
	}

	async disableShare()
	{
		logger.debug('disableShare()');

		if (!this._shareProducer)
			return;

		this._shareProducer.close();

		store.dispatch(
			stateActions.removeProducer(this._shareProducer.id));

		try
		{
			await this._protoo.request(
				'closeProducer', { producerId: this._shareProducer.id });
		}
		catch (error)
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `关闭服务器端共享生成器时出错: ${error}`
				}));
		}

		this._shareProducer = null;
	}

	async enableAudioOnly()
	{
		logger.debug('enableAudioOnly()');

		store.dispatch(
			stateActions.setAudioOnlyInProgress(true));

		this.disableWebcam();

		for (const consumer of this._consumers.values())
		{
			if (consumer.kind !== 'video')
				continue;

			this._pauseConsumer(consumer);
		}

		store.dispatch(
			stateActions.setAudioOnlyState(true));

		store.dispatch(
			stateActions.setAudioOnlyInProgress(false));
	}

	async disableAudioOnly()
	{
		logger.debug('disableAudioOnly()');

		store.dispatch(
			stateActions.setAudioOnlyInProgress(true));

		if (
			!this._webcamProducer &&
			this._produce &&
			(cookiesManager.getDevices() || {}).webcamEnabled
		)
		{
			this.enableWebcam();
		}

		for (const consumer of this._consumers.values())
		{
			if (consumer.kind !== 'video')
				continue;

			this._resumeConsumer(consumer);
		}

		store.dispatch(
			stateActions.setAudioOnlyState(false));

		store.dispatch(
			stateActions.setAudioOnlyInProgress(false));
	}

	async muteAudio()
	{
		logger.debug('muteAudio()');

		store.dispatch(
			stateActions.setAudioMutedState(true));
	}

	async unmuteAudio()
	{
		logger.debug('unmuteAudio()');

		store.dispatch(
			stateActions.setAudioMutedState(false));
	}

	async restartIce()
	{
		logger.debug('restartIce()');

		store.dispatch(
			stateActions.setRestartIceInProgress(true));

		try
		{
			if (this._sendTransport)
			{
				const iceParameters = await this._protoo.request(
					'restartIce',
					{ transportId: this._sendTransport.id });

				await this._sendTransport.restartIce({ iceParameters });
			}

			if (this._recvTransport)
			{
				const iceParameters = await this._protoo.request(
					'restartIce',
					{ transportId: this._recvTransport.id });

				await this._recvTransport.restartIce({ iceParameters });
			}

			store.dispatch(requestActions.notify(
				{
					text : 'ICE 重新启动'
				}));
		}
		catch (error)
		{
			logger.error('restartIce() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `ICE 重启失败: ${error}`
				}));
		}

		store.dispatch(
			stateActions.setRestartIceInProgress(false));
	}

	async setMaxSendingSpatialLayer(spatialLayer)
	{
		logger.debug('setMaxSendingSpatialLayer() [spatialLayer:%s]', spatialLayer);

		try
		{
			if (this._webcamProducer)
				await this._webcamProducer.setMaxSpatialLayer(spatialLayer);
			else if (this._shareProducer)
				await this._shareProducer.setMaxSpatialLayer(spatialLayer);
		}
		catch (error)
		{
			logger.error('setMaxSendingSpatialLayer() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `设置最大发送视频空间层时出错: ${error}`
				}));
		}
	}

	async setConsumerPreferredLayers(consumerId, spatialLayer, temporalLayer)
	{
		logger.debug(
			'setConsumerPreferredLayers() [consumerId:%s, spatialLayer:%s, temporalLayer:%s]',
			consumerId, spatialLayer, temporalLayer);

		try
		{
			await this._protoo.request(
				'setConsumerPreferredLayers', { consumerId, spatialLayer, temporalLayer });

			store.dispatch(stateActions.setConsumerPreferredLayers(
				consumerId, spatialLayer, temporalLayer));
		}
		catch (error)
		{
			logger.error('setConsumerPreferredLayers() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `设置用户首选图层时出错: ${error}`
				}));
		}
	}

	async setConsumerPriority(consumerId, priority)
	{
		logger.debug(
			'setConsumerPriority() [consumerId:%s, priority:%d]',
			consumerId, priority);

		try
		{
			await this._protoo.request('setConsumerPriority', { consumerId, priority });

			store.dispatch(stateActions.setConsumerPriority(consumerId, priority));
		}
		catch (error)
		{
			logger.error('setConsumerPriority() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `设置用户优先级时出错: ${error}`
				}));
		}
	}

	async requestConsumerKeyFrame(consumerId)
	{
		logger.debug('requestConsumerKeyFrame() [consumerId:%s]', consumerId);

		try
		{
			await this._protoo.request('requestConsumerKeyFrame', { consumerId });

			store.dispatch(requestActions.notify(
				{
					text : '为视频用户请求关键帧'
				}));
		}
		catch (error)
		{
			logger.error('requestConsumerKeyFrame() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `为用户请求关键帧时出错: ${error}`
				}));
		}
	}

	async enableChatDataProducer()
	{
		logger.debug('enableChatDataProducer()');

		if (!this._useDataChannel)
			return;

		// NOTE: Should enable this code but it's useful for testing.
		// if (this._chatDataProducer)
		// 	return;

		try
		{
			// Create chat DataProducer.
			this._chatDataProducer = await this._sendTransport.produceData(
				{
					ordered        : false,
					maxRetransmits : 1,
					label          : 'chat',
					priority       : 'medium',
					appData        : { info: 'my-chat-DataProducer' }
				});

			store.dispatch(stateActions.addDataProducer(
				{
					id                   : this._chatDataProducer.id,
					sctpStreamParameters : this._chatDataProducer.sctpStreamParameters,
					label                : this._chatDataProducer.label,
					protocol             : this._chatDataProducer.protocol
				}));

			this._chatDataProducer.on('transportclose', () =>
			{
				this._chatDataProducer = null;
			});

			this._chatDataProducer.on('open', () =>
			{
				logger.debug('chat DataProducer "open" event');
			});

			this._chatDataProducer.on('close', () =>
			{
				logger.error('chat DataProducer "close" event');

				this._chatDataProducer = null;

				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : '聊天数据生成器已关闭'
					}));
			});

			this._chatDataProducer.on('error', (error) =>
			{
				logger.error('chat DataProducer "error" event:%o', error);

				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : `聊天数据生成器错误: ${error}`
					}));
			});

			this._chatDataProducer.on('bufferedamountlow', () =>
			{
				logger.debug('chat DataProducer "bufferedamountlow" event');
			});
		}
		catch (error)
		{
			logger.error('enableChatDataProducer() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `启用聊天数据生成器时出错: ${error}`
				}));

			throw error;
		}
	}

	async enableBotDataProducer()
	{
		logger.debug('enableBotDataProducer()');

		if (!this._useDataChannel)
			return;

		// NOTE: Should enable this code but it's useful for testing.
		// if (this._botDataProducer)
		// 	return;

		try
		{
			// Create chat DataProducer.
			this._botDataProducer = await this._sendTransport.produceData(
				{
					ordered           : false,
					maxPacketLifeTime : 2000,
					label             : 'bot',
					priority          : 'medium',
					appData           : { info: 'my-bot-DataProducer' }
				});

			store.dispatch(stateActions.addDataProducer(
				{
					id                   : this._botDataProducer.id,
					sctpStreamParameters : this._botDataProducer.sctpStreamParameters,
					label                : this._botDataProducer.label,
					protocol             : this._botDataProducer.protocol
				}));

			this._botDataProducer.on('transportclose', () =>
			{
				this._botDataProducer = null;
			});

			this._botDataProducer.on('open', () =>
			{
				logger.debug('bot DataProducer "open" event');
			});

			this._botDataProducer.on('close', () =>
			{
				logger.error('bot DataProducer "close" event');

				this._botDataProducer = null;

				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : 'Bot DataProducer 已关闭'
					}));
			});

			this._botDataProducer.on('error', (error) =>
			{
				logger.error('bot DataProducer "error" event:%o', error);

				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : `Bot DataProducer 错误: ${error}`
					}));
			});

			this._botDataProducer.on('bufferedamountlow', () =>
			{
				logger.debug('bot DataProducer "bufferedamountlow" event');
			});
		}
		catch (error)
		{
			logger.error('enableBotDataProducer() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `启用bot DataProducter时出错: ${error}`
				}));

			throw error;
		}
	}

	async sendChatMessage(text)
	{
		logger.debug('sendChatMessage() [text:"%s]', text);

		if (!this._chatDataProducer)
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : '无聊天 DataProducter'
				}));

			return;
		}

		try
		{
			this._chatDataProducer.send(text);
		}
		catch (error)
		{
			logger.error('chat DataProducer.send() failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `聊天DataProducter.send()失败: ${error}`
				}));
		}
	}

	async sendBotMessage(text)
	{
		logger.debug('sendBotMessage() [text:"%s]', text);

		if (!this._botDataProducer)
		{
			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : 'No bot DataProducer'
				}));

			return;
		}

		try
		{
			this._botDataProducer.send(text);
		}
		catch (error)
		{
			logger.error('bot DataProducer.send() failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `bot DataProducer.send() failed: ${error}`
				}));
		}
	}

	async changeDisplayName(displayName)
	{
		logger.debug('changeDisplayName() [displayName:"%s"]', displayName);

		// Store in cookie.
		cookiesManager.setUser({ displayName });

		try
		{
			await this._protoo.request('changeDisplayName', { displayName });

			this._displayName = displayName;

			store.dispatch(
				stateActions.setDisplayName(displayName));

			store.dispatch(requestActions.notify(
				{
					text : '显示名称已更改'
				}));
		}
		catch (error)
		{
			logger.error('changeDisplayName() | failed: %o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `无法更改显示名称: ${error}`
				}));

			// We need to refresh the component for it to render the previous
			// displayName again.
			store.dispatch(
				stateActions.setDisplayName());
		}
	}

	async getSendTransportRemoteStats()
	{
		logger.debug('getSendTransportRemoteStats()');

		if (!this._sendTransport)
			return;

		return this._protoo.request(
			'getTransportStats', { transportId: this._sendTransport.id });
	}

	async getRecvTransportRemoteStats()
	{
		logger.debug('getRecvTransportRemoteStats()');

		if (!this._recvTransport)
			return;

		return this._protoo.request(
			'getTransportStats', { transportId: this._recvTransport.id });
	}

	async getAudioRemoteStats()
	{
		logger.debug('getAudioRemoteStats()');

		if (!this._micProducer)
			return;

		return this._protoo.request(
			'getProducerStats', { producerId: this._micProducer.id });
	}

	async getVideoRemoteStats()
	{
		logger.debug('getVideoRemoteStats()');

		const producer = this._webcamProducer || this._shareProducer;

		if (!producer)
			return;

		return this._protoo.request(
			'getProducerStats', { producerId: producer.id });
	}

	async getConsumerRemoteStats(consumerId)
	{
		logger.debug('getConsumerRemoteStats()');

		const consumer = this._consumers.get(consumerId);

		if (!consumer)
			return;

		return this._protoo.request('getConsumerStats', { consumerId });
	}

	async getChatDataProducerRemoteStats()
	{
		logger.debug('getChatDataProducerRemoteStats()');

		const dataProducer = this._chatDataProducer;

		if (!dataProducer)
			return;

		return this._protoo.request(
			'getDataProducerStats', { dataProducerId: dataProducer.id });
	}

	async getBotDataProducerRemoteStats()
	{
		logger.debug('getBotDataProducerRemoteStats()');

		const dataProducer = this._botDataProducer;

		if (!dataProducer)
			return;

		return this._protoo.request(
			'getDataProducerStats', { dataProducerId: dataProducer.id });
	}

	async getDataConsumerRemoteStats(dataConsumerId)
	{
		logger.debug('getDataConsumerRemoteStats()');

		const dataConsumer = this._dataConsumers.get(dataConsumerId);

		if (!dataConsumer)
			return;

		return this._protoo.request('getDataConsumerStats', { dataConsumerId });
	}

	async getSendTransportLocalStats()
	{
		logger.debug('getSendTransportLocalStats()');

		if (!this._sendTransport)
			return;

		return this._sendTransport.getStats();
	}

	async getRecvTransportLocalStats()
	{
		logger.debug('getRecvTransportLocalStats()');

		if (!this._recvTransport)
			return;

		return this._recvTransport.getStats();
	}

	async getAudioLocalStats()
	{
		logger.debug('getAudioLocalStats()');

		if (!this._micProducer)
			return;

		return this._micProducer.getStats();
	}

	async getVideoLocalStats()
	{
		logger.debug('getVideoLocalStats()');

		const producer = this._webcamProducer || this._shareProducer;

		if (!producer)
			return;

		return producer.getStats();
	}

	async getConsumerLocalStats(consumerId)
	{
		const consumer = this._consumers.get(consumerId);

		if (!consumer)
			return;

		return consumer.getStats();
	}

	async applyNetworkThrottle({ uplink, downlink, rtt, secret, packetLoss })
	{
		logger.debug(
			'applyNetworkThrottle() [uplink:%s, downlink:%s, rtt:%s, packetLoss:%s]',
			uplink, downlink, rtt, packetLoss);

		try
		{
			await this._protoo.request(
				'applyNetworkThrottle',
				{ secret, uplink, downlink, rtt, packetLoss });
		}
		catch (error)
		{
			logger.error('applyNetworkThrottle() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `应用网络节流时出错: ${error}`
				}));
		}
	}

	async resetNetworkThrottle({ silent = false, secret })
	{
		logger.debug('resetNetworkThrottle()');

		try
		{
			await this._protoo.request('resetNetworkThrottle', { secret });
		}
		catch (error)
		{
			if (!silent)
			{
				logger.error('resetNetworkThrottle() | failed:%o', error);

				store.dispatch(requestActions.notify(
					{
						type : 'error',
						text : `重置网络节流阀时出错: ${error}`
					}));
			}
		}
	}

	async _joinRoom()
	{
		logger.debug('_joinRoom()');

		try
		{
			this._mediasoupDevice = new mediasoupClient.Device(
				{
					handlerName : this._handlerName
				});

			store.dispatch(stateActions.setRoomMediasoupClientHandler(
				this._mediasoupDevice.handlerName
			));

			const routerRtpCapabilities =
				await this._protoo.request('getRouterRtpCapabilities');

			await this._mediasoupDevice.load({ routerRtpCapabilities });

			// NOTE: Stuff to play remote audios due to browsers' new autoplay policy.
			//
			// Just get access to the mic and DO NOT close the mic track for a while.
			// Super hack!
			{
				const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
				const audioTrack = stream.getAudioTracks()[0];

				audioTrack.enabled = false;

				setTimeout(() => audioTrack.stop(), 120000);
			}
			// Create mediasoup Transport for sending (unless we don't want to produce).
			if (this._produce)
			{
				const transportInfo = await this._protoo.request(
					'createWebRtcTransport',
					{
						forceTcp         : this._forceTcp,
						producing        : true,
						consuming        : false,
						sctpCapabilities : this._useDataChannel
							? this._mediasoupDevice.sctpCapabilities
							: undefined
					});

				const {
					id,
					iceParameters,
					iceCandidates,
					dtlsParameters,
					sctpParameters
				} = transportInfo;

				this._sendTransport = this._mediasoupDevice.createSendTransport(
					{
						id,
						iceParameters,
						iceCandidates,
						dtlsParameters :
						{
							...dtlsParameters,
							// Remote DTLS role. We know it's always 'auto' by default so, if
							// we want, we can force local WebRTC transport to be 'client' by
							// indicating 'server' here and vice-versa.
							role : 'auto'
						},
						sctpParameters,
						iceServers             : [],
						proprietaryConstraints : PC_PROPRIETARY_CONSTRAINTS,
						additionalSettings 	   :
							{ encodedInsertableStreams: this._e2eKey && e2e.isSupported() }
					});

				this._sendTransport.on(
					'connect', ({ iceParameters, dtlsParameters }, callback, errback) => // eslint-disable-line no-shadow
					{
						this._protoo.request(
							'connectWebRtcTransport',
							{
								transportId : this._sendTransport.id,
								iceParameters,
								dtlsParameters
							})
							.then(callback)
							.catch(errback);
					});

				this._sendTransport.on(
					'produce', async ({ kind, rtpParameters, appData }, callback, errback) =>
					{
						try
						{
							// eslint-disable-next-line no-shadow
							const { id } = await this._protoo.request(
								'produce',
								{
									transportId : this._sendTransport.id,
									kind,
									rtpParameters,
									appData
								});

							callback({ id });
						}
						catch (error)
						{
							errback(error);
						}
					});

				this._sendTransport.on('producedata', async (
					{
						sctpStreamParameters,
						label,
						protocol,
						appData
					},
					callback,
					errback
				) =>
				{
					logger.debug(
						'"producedata" event: [sctpStreamParameters:%o, appData:%o]',
						sctpStreamParameters, appData);

					try
					{
						// eslint-disable-next-line no-shadow
						const { id } = await this._protoo.request(
							'produceData',
							{
								transportId : this._sendTransport.id,
								sctpStreamParameters,
								label,
								protocol,
								appData
							});

						callback({ id });
					}
					catch (error)
					{
						errback(error);
					}
				});
			}

			// Create mediasoup Transport for receiving (unless we don't want to consume).
			if (this._consume)
			{
				const transportInfo = await this._protoo.request(
					'createWebRtcTransport',
					{
						forceTcp         : this._forceTcp,
						producing        : false,
						consuming        : true,
						sctpCapabilities : this._useDataChannel
							? this._mediasoupDevice.sctpCapabilities
							: undefined
					});

				const {
					id,
					iceParameters,
					iceCandidates,
					dtlsParameters,
					sctpParameters
				} = transportInfo;

				this._recvTransport = this._mediasoupDevice.createRecvTransport(
					{
						id,
						iceParameters,
						iceCandidates,
						dtlsParameters :
						{
							...dtlsParameters,
							// Remote DTLS role. We know it's always 'auto' by default so, if
							// we want, we can force local WebRTC transport to be 'client' by
							// indicating 'server' here and vice-versa.
							role : 'auto'
						},
						sctpParameters,
						iceServers 	       : [],
						additionalSettings :
							{ encodedInsertableStreams: this._e2eKey && e2e.isSupported() }
					});

				this._recvTransport.on(
					'connect', ({ iceParameters, dtlsParameters }, callback, errback) => // eslint-disable-line no-shadow
					{
						this._protoo.request(
							'connectWebRtcTransport',
							{
								transportId : this._recvTransport.id,
								iceParameters,
								dtlsParameters
							})
							.then(callback)
							.catch(errback);
					});
			}

			// Join now into the room.
			// NOTE: Don't send our RTP capabilities if we don't want to consume.
			const { peers } = await this._protoo.request(
				'join',
				{
					displayName     : this._displayName,
					device          : this._device,
					rtpCapabilities : this._consume
						? this._mediasoupDevice.rtpCapabilities
						: undefined,
					sctpCapabilities : this._useDataChannel && this._consume
						? this._mediasoupDevice.sctpCapabilities
						: undefined
				});

			store.dispatch(
				stateActions.setRoomState('connected'));

			// Clean all the existing notifcations.
			store.dispatch(
				stateActions.removeAllNotifications());

			// store.dispatch(requestActions.notify(
			// 	{
			// 		isMe		: true,
			// 		text    : '你已成功加入房间',
			// 		timeout : 3000
			// 	}));

			for (const peer of peers)
			{
				store.dispatch(
					stateActions.addPeer(
						{ ...peer, consumers: [], dataConsumers: [] }));
			}

			// Enable mic/webcam.
			if (this._produce)
			{
				// Set our media capabilities.
				store.dispatch(stateActions.setMediaCapabilities(
					{
						canSendMic    : this._mediasoupDevice.canProduce('audio'),
						canSendWebcam : this._mediasoupDevice.canProduce('video')
					}));

				this.enableMic();

				const devicesCookie = cookiesManager.getDevices();

				if (!devicesCookie || devicesCookie.webcamEnabled || this._externalVideo)
					this.enableWebcam();

				this._sendTransport.on('connectionstatechange', (connectionState) =>
				{
					if (connectionState === 'connected')
					{
						this.enableChatDataProducer();
						this.enableBotDataProducer();
					}
				});
			}

			// NOTE: For testing.
			if (window.SHOW_INFO)
			{
				const { me } = store.getState();

				store.dispatch(
					stateActions.setRoomStatsPeerId(me.id));
			}
		}
		catch (error)
		{
			logger.error('_joinRoom() failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `无法加入房间: ${error}`
				}));

			this.close();
		}
	}

	async _updateWebcams()
	{
		logger.debug('_updateWebcams()');

		// Reset the list.
		this._webcams = new Map();

		logger.debug('_updateWebcams() | calling enumerateDevices()');

		const devices = await navigator.mediaDevices.enumerateDevices();

		for (const device of devices)
		{
			if (device.kind !== 'videoinput')
				continue;

			this._webcams.set(device.deviceId, device);
		}

		const array = Array.from(this._webcams.values());
		const len = array.length;
		const currentWebcamId =
			this._webcam.device ? this._webcam.device.deviceId : undefined;

		logger.debug('_updateWebcams() [webcams:%o]', array);

		if (len === 0)
			this._webcam.device = null;
		else if (!this._webcams.has(currentWebcamId))
			this._webcam.device = array[0];

		store.dispatch(
			stateActions.setCanChangeWebcam(this._webcams.size > 1));
	}

	_getWebcamType(device)
	{
		if (/(back|rear)/i.test(device.label))
		{
			logger.debug('_getWebcamType() | it seems to be a back camera');

			return 'back';
		}
		else
		{
			logger.debug('_getWebcamType() | it seems to be a front camera');

			return 'front';
		}
	}

	async _pauseConsumer(consumer)
	{
		if (consumer.paused)
			return;

		try
		{
			await this._protoo.request('pauseConsumer', { consumerId: consumer.id });

			consumer.pause();

			store.dispatch(
				stateActions.setConsumerPaused(consumer.id, 'local'));
		}
		catch (error)
		{
			logger.error('_pauseConsumer() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `暂停用户时出错: ${error}`
				}));
		}
	}

	async _resumeConsumer(consumer)
	{
		if (!consumer.paused)
			return;

		try
		{
			await this._protoo.request('resumeConsumer', { consumerId: consumer.id });

			consumer.resume();

			store.dispatch(
				stateActions.setConsumerResumed(consumer.id, 'local'));
		}
		catch (error)
		{
			logger.error('_resumeConsumer() | failed:%o', error);

			store.dispatch(requestActions.notify(
				{
					type : 'error',
					text : `恢复用户时出错: ${error}`
				}));
		}
	}

	async _getExternalVideoStream()
	{
		if (this._externalVideoStream)
			return this._externalVideoStream;

		if (this._externalVideo.readyState < 3)
		{
			await new Promise((resolve) => (
				this._externalVideo.addEventListener('canplay', resolve)
			));
		}

		if (this._externalVideo.captureStream)
			this._externalVideoStream = this._externalVideo.captureStream();
		else if (this._externalVideo.mozCaptureStream)
			this._externalVideoStream = this._externalVideo.mozCaptureStream();
		else
			throw new Error('video.captureStream() not supported');

		return this._externalVideoStream;
	}
}