import { Session } from 'meteor/session';
import Settings from '/imports/ui/services/settings';
import Auth from '/imports/ui/services/auth';
import Meetings from '/imports/api/meetings';
import Users from '/imports/api/users';
import UserListService from '/imports/ui/components/user-list/service';
import { meetingIsBreakout } from '/imports/ui/components/app/service';
import { notify } from '/imports/ui/services/notification';
import deviceInfo from '/imports/utils/deviceInfo';
import browserInfo from '/imports/utils/browserInfo';
import getFromUserSettings from '/imports/ui/services/users-settings';
import VideoPreviewService from '/imports/ui/components/video-preview/service';
import Storage from '/imports/ui/services/storage/session';
import BBBStorage from '/imports/ui/services/storage';
import logger from '/imports/startup/client/logger';
import { debounce } from '/imports/utils/debounce';
import getFromMeetingSettings from '/imports/ui/services/meeting-settings';
import {
  setVideoState,
  setConnectingStream,
  getVideoState,
  Stream,
} from './state';
import WebRtcPeer from '/imports/ui/services/webrtc-base/peer';
import { Constraints2, DesktopPageSizes, MobilePageSizes } from '/imports/ui/Types/meetingClientSettings';
import MediaStreamUtils from '/imports/utils/media-stream-utils';

const CAMERA_PROFILES = window.meetingClientSettings.public.kurento.cameraProfiles;
const MULTIPLE_CAMERAS = window.meetingClientSettings.public.app.enableMultipleCameras;

const SFU_URL = window.meetingClientSettings.public.kurento.wsUrl;
const ROLE_MODERATOR = window.meetingClientSettings.public.user.role_moderator;
const ROLE_VIEWER = window.meetingClientSettings.public.user.role_viewer;
const MIRROR_WEBCAM = window.meetingClientSettings.public.app.mirrorOwnWebcam;
const PIN_WEBCAM = window.meetingClientSettings.public.kurento.enableVideoPin;
const {
  thresholds: CAMERA_QUALITY_THRESHOLDS = [],
  applyConstraints: CAMERA_QUALITY_THR_CONSTRAINTS = false,
  debounceTime: CAMERA_QUALITY_THR_DEBOUNCE = 2500,
} = window.meetingClientSettings.public.kurento.cameraQualityThresholds;
const {
  paginationToggleEnabled: PAGINATION_TOGGLE_ENABLED,
  pageChangeDebounceTime: PAGE_CHANGE_DEBOUNCE_TIME,
  desktopPageSizes: DESKTOP_PAGE_SIZES,
  mobilePageSizes: MOBILE_PAGE_SIZES,
} = window.meetingClientSettings.public.kurento.pagination;
const PAGINATION_THRESHOLDS_CONF = window.meetingClientSettings.public.kurento.paginationThresholds;
const PAGINATION_THRESHOLDS = PAGINATION_THRESHOLDS_CONF.thresholds.sort((t1, t2) => t1.users - t2.users);
const PAGINATION_THRESHOLDS_ENABLED = PAGINATION_THRESHOLDS_CONF.enabled;
const DEFAULT_VIDEO_MEDIA_SERVER = window.meetingClientSettings.public.kurento.videoMediaServer;

const TOKEN = '_';

class VideoService {
  public isMobile: boolean;

  public webRtcPeersRef: Record<string, WebRtcPeer>;

  private userParameterProfile: string | null;

  private isSafari: boolean;

  private numberOfDevices: number;

  private record: boolean | null;

  private hackRecordViewer: boolean | null;

  private deviceId: string | null = null;

  constructor() {
    this.userParameterProfile = null;
    this.isMobile = deviceInfo.isMobile;
    this.isSafari = browserInfo.isSafari;
    this.numberOfDevices = 0;
    this.record = null;
    this.hackRecordViewer = null;

    if (navigator.mediaDevices) {
      this.updateNumberOfDevices = this.updateNumberOfDevices.bind(this);
      if (!this.isSafari) {
        navigator.mediaDevices.ondevicechange = () => this.updateNumberOfDevices();
      }
      this.updateNumberOfDevices();
    }

    this.webRtcPeersRef = {};
  }

  static fetchNumberOfDevices(devices: MediaDeviceInfo[]) {
    const deviceIds: string[] = [];
    devices.forEach((d) => {
      const validDeviceId = d.deviceId !== '' && !deviceIds.includes(d.deviceId);
      if (d.kind === 'videoinput' && validDeviceId) {
        deviceIds.push(d.deviceId);
      }
    });

    return deviceIds.length;
  }

  updateNumberOfDevices(devices: MediaDeviceInfo[] | null = null) {
    if (devices) {
      this.numberOfDevices = VideoService.fetchNumberOfDevices(devices);
    } else {
      navigator.mediaDevices.enumerateDevices().then((devices) => {
        this.numberOfDevices = VideoService.fetchNumberOfDevices(devices);
      });
    }
  }

  static disableCam() {
    const m = Meetings.findOne({ meetingId: Auth.meetingID },
      { fields: { 'lockSettings.disableCam': 1 } });
    return m.lockSettings ? m.lockSettings.disableCam : false;
  }

  static isUserLocked() {
    return !!Users.findOne({
      userId: Auth.userID,
      locked: true,
      role: { $ne: ROLE_MODERATOR },
    }, { fields: {} }) && VideoService.disableCam();
  }

  joinVideo(deviceId: string) {
    this.deviceId = deviceId;
    Storage.setItem('isFirstJoin', false);
    if (!VideoService.isUserLocked()) {
      const streamName = VideoService.buildStreamName(Auth.userID ?? '', deviceId);
      const stream = {
        stream: streamName,
        userId: Auth.userID ?? '',
        name: Auth.fullname ?? '',
        type: 'connecting' as const,
      };
      setConnectingStream(stream);
      setVideoState((curr) => ({
        ...curr,
        isConnecting: true,
      }));
    }
  }

  joinedVideo() {
    setVideoState((curr) => ({
      ...curr,
      isConnected: true,
      isConnecting: false,
    }));
    this.stopConnectingStream();
  }

  static storeDeviceIds(streams: Stream[]) {
    const deviceIds: string[] = [];
    streams.filter((s) => s.userId === Auth.userID).forEach((s) => {
      deviceIds.push(s.deviceId);
    });
    Session.set('deviceIds', deviceIds.join());
  }

  exitedVideo() {
    this.stopConnectingStream();
    setVideoState((curr) => ({
      ...curr,
      isConnecting: false,
      isConnected: false,
    }));
  }

  static getAuthenticatedURL() {
    return Auth.authenticateURL(SFU_URL);
  }

  shouldRenderPaginationToggle() {
    return PAGINATION_TOGGLE_ENABLED && (this.getMyPageSize() ?? 0) > 0;
  }

  static isPaginationEnabled() {
    // @ts-expect-error -> Untyped object.
    return Settings.application.paginationEnabled;
  }

  static setCurrentVideoPageIndex(newVideoPageIndex: number) {
    const { currentVideoPageIndex } = getVideoState();
    if (currentVideoPageIndex !== newVideoPageIndex) {
      setVideoState((curr) => ({
        ...curr,
        currentVideoPageIndex: newVideoPageIndex,
      }));
    }
  }

  static getCurrentVideoPageIndex() {
    const { currentVideoPageIndex } = getVideoState();
    return currentVideoPageIndex;
  }

  static calculateNextPage() {
    const { numberOfPages, currentVideoPageIndex } = getVideoState();
    if (numberOfPages === 0) {
      return 0;
    }

    return (((currentVideoPageIndex + 1) % numberOfPages) + numberOfPages) % numberOfPages;
  }

  static calculatePreviousPage() {
    const { numberOfPages, currentVideoPageIndex } = getVideoState();
    if (numberOfPages === 0) {
      return 0;
    }

    return (((currentVideoPageIndex - 1) % numberOfPages) + numberOfPages) % numberOfPages;
  }

  static getNextVideoPage() {
    const nextPage = VideoService.calculateNextPage();
    VideoService.setCurrentVideoPageIndex(nextPage);
  }

  static getPreviousVideoPage() {
    const previousPage = VideoService.calculatePreviousPage();
    VideoService.setCurrentVideoPageIndex(previousPage);
  }

  getPageSizeDictionary() {
    if (!PAGINATION_THRESHOLDS_ENABLED || PAGINATION_THRESHOLDS.length <= 0) {
      return !this.isMobile ? DESKTOP_PAGE_SIZES : MOBILE_PAGE_SIZES;
    }

    let targetThreshold;
    const userCount = UserListService.getUserCount();
    const processThreshold = (
      threshold: {
        desktopPageSizes?: DesktopPageSizes,
        mobilePageSizes?: MobilePageSizes,
      } = {
        desktopPageSizes: DESKTOP_PAGE_SIZES,
        mobilePageSizes: MOBILE_PAGE_SIZES,
      },
    ) => {
      if (!this.isMobile) {
        return threshold.desktopPageSizes || DESKTOP_PAGE_SIZES;
      }
      return threshold.mobilePageSizes || MOBILE_PAGE_SIZES;
    };

    if (userCount < PAGINATION_THRESHOLDS[0].users) return processThreshold();

    for (let mapIndex = PAGINATION_THRESHOLDS.length - 1; mapIndex >= 0; mapIndex -= 1) {
      targetThreshold = PAGINATION_THRESHOLDS[mapIndex];
      if (targetThreshold.users <= userCount) {
        return processThreshold(targetThreshold);
      }
    }
    return null;
  }

  getMyPageSize() {
    let size;
    const myRole = VideoService.getMyRole();
    const pageSizes = this.getPageSizeDictionary();
    switch (myRole) {
      case ROLE_MODERATOR:
        size = pageSizes?.moderator;
        break;
      case ROLE_VIEWER:
      default:
        size = pageSizes?.viewer;
    }

    return size;
  }

  static isGridEnabled() {
    return Session.get('isGridEnabled');
  }

  stopConnectingStream() {
    this.deviceId = null;
    setConnectingStream(null);
  }

  static buildStreamName(userId: string, deviceId: string) {
    return `${userId}${TOKEN}${deviceId}`;
  }

  static getMediaServerAdapter() {
    return getFromMeetingSettings('media-server-video', DEFAULT_VIDEO_MEDIA_SERVER);
  }

  static getMyRole() {
    return Users.findOne({ userId: Auth.userID },
      { fields: { role: 1 } })?.role;
  }

  getRecord() {
    if (this.record === null) {
      this.record = getFromUserSettings('bbb_record_video', true);
    }

    if (this.hackRecordViewer === null) {
      const value = getFromMeetingSettings('hack-record-viewer-video', null);
      this.hackRecordViewer = value ? value.toLowerCase() === 'true' : true;
    }

    const hackRecord = VideoService.getMyRole() === ROLE_MODERATOR || this.hackRecordViewer;

    return this.record && hackRecord;
  }

  static getInfo() {
    const m = Meetings.findOne({ meetingId: Auth.meetingID },
      { fields: { 'voiceSettings.voiceConf': 1 } });
    const voiceBridge = m.voiceSettings ? m.voiceSettings.voiceConf : null;
    return {
      userId: Auth.userID,
      userName: Auth.fullname,
      meetingId: Auth.meetingID,
      sessionToken: Auth.sessionToken,
      voiceBridge,
    };
  }

  static mirrorOwnWebcam(userId: string | null = null) {
    const isOwnWebcam = userId ? Auth.userID === userId : true;
    const isEnabledMirroring = getFromUserSettings('bbb_mirror_own_webcam', MIRROR_WEBCAM);
    return isOwnWebcam && isEnabledMirroring;
  }

  static isPinEnabled() {
    return PIN_WEBCAM;
  }

  static isVideoPinEnabledForCurrentUser(isModerator: boolean) {
    const isBreakout = meetingIsBreakout();
    const isPinEnabled = VideoService.isPinEnabled();

    return !!(isModerator
      && isPinEnabled
      && !isBreakout);
  }

  static getMyStreamId(deviceId: string, streams: Stream[]) {
    const videoStream = streams.find((vs) => vs.userId === Auth.userID && vs.deviceId === deviceId);
    return videoStream ? videoStream.stream : null;
  }

  static isLocalStream(cameraId: string) {
    return !!Auth.userID && cameraId?.startsWith(Auth.userID);
  }

  static getCameraProfile() {
    const profileId = BBBStorage.getItem('WebcamProfileId') || '';
    const cameraProfile = CAMERA_PROFILES.find((profile) => profile.id === profileId)
      || CAMERA_PROFILES.find((profile) => profile.default)
      || CAMERA_PROFILES[0];
    const deviceId = BBBStorage.getItem('WebcamDeviceId');
    if (deviceId) {
      // @ts-expect-error -> Untyped object.
      cameraProfile.constraints = cameraProfile.constraints || {};
      // @ts-expect-error -> Untyped object.
      cameraProfile.constraints.deviceId = { exact: deviceId };
    }

    return cameraProfile;
  }

  static addCandidateToPeer(peer: WebRtcPeer, candidate: Record<string | symbol, unknown>, cameraId: string) {
    peer.addIceCandidate(candidate).catch((error: Error) => {
      if (error) {
        logger.error({
          logCode: 'video_provider_addicecandidate_error',
          extraInfo: {
            cameraId,
            error,
          },
        }, `Adding ICE candidate failed for ${cameraId} due to ${error.message}`);
      }
    });
  }

  static processInboundIceQueue(peer: WebRtcPeer, cameraId: string) {
    // @ts-expect-error -> Untyped object.
    while (peer.inboundIceQueue.length) {
      // @ts-expect-error -> Untyped object.
      const candidate = peer.inboundIceQueue.shift();
      VideoService.addCandidateToPeer(peer, candidate, cameraId);
    }
  }

  static getRole(isLocal: boolean) {
    return isLocal ? 'share' : 'viewer';
  }

  getUserParameterProfile() {
    if (this.userParameterProfile === null) {
      this.userParameterProfile = getFromUserSettings(
        'bbb_preferred_camera_profile',
        (CAMERA_PROFILES.find((i) => i.default) || {}).id || null,
      );
    }

    return this.userParameterProfile;
  }

  isMultipleCamerasEnabled() {
    return MULTIPLE_CAMERAS
      && !VideoPreviewService.getSkipVideoPreview()
      && !this.isMobile
      && !this.isSafari
      && this.numberOfDevices > 1;
  }

  static isProfileBetter(newProfileId: string, originalProfileId: string) {
    return CAMERA_PROFILES.findIndex(({ id }) => id === newProfileId)
      > CAMERA_PROFILES.findIndex(({ id }) => id === originalProfileId);
  }

  static applyBitrate(peer: WebRtcPeer, bitrate: number) {
    const { peerConnection } = peer;
    if ('RTCRtpSender' in window
      && 'setParameters' in window.RTCRtpSender.prototype
      && 'getParameters' in window.RTCRtpSender.prototype) {
      peerConnection.getSenders().forEach((sender: RTCRtpSender) => {
        const { track } = sender;
        if (track && track.kind === 'video') {
          const parameters = sender.getParameters();
          const normalizedBitrate = bitrate * 1000;

          if (parameters.encodings == null || parameters.encodings.length === 0) {
            parameters.encodings = [{}];
          }

          if (parameters.encodings[0].maxBitrate !== normalizedBitrate) {
            parameters.encodings[0].maxBitrate = normalizedBitrate;
            sender.setParameters(parameters)
              .then(() => {
                logger.info({
                  logCode: 'video_provider_bitratechange',
                  extraInfo: { bitrate },
                }, `Bitrate changed: ${bitrate}`);
              })
              .catch((error) => {
                logger.warn({
                  logCode: 'video_provider_bitratechange_failed',
                  extraInfo: { bitrate, errorMessage: error.message, errorCode: error.code },
                }, 'Bitrate change failed.');
              });
          }
        }
      });
    }
  }

  static reapplyResolutionIfNeeded(track: MediaStreamTrack, constraints?: Constraints2) {
    if (typeof track.getSettings !== 'function') {
      return constraints;
    }

    const trackSettings = track.getSettings();

    if (trackSettings.width && trackSettings.height) {
      return {
        ...constraints,
        width: trackSettings.width,
        height: trackSettings.height,
      };
    }

    return constraints;
  }

  static applyCameraProfile(peer: WebRtcPeer, profileId: string) {
    const profile = CAMERA_PROFILES.find((targetProfile) => targetProfile.id === profileId);

    if (!profile
      || peer == null
      || peer.peerConnection == null
      // @ts-expect-error -> Untyped object.
      || peer.currentProfileId === profileId
      // @ts-expect-error -> Untyped object.
      || VideoService.isProfileBetter(profileId, peer.originalProfileId)) {
      return;
    }

    const { bitrate, constraints } = profile;

    if (bitrate) VideoService.applyBitrate(peer, bitrate);

    if (CAMERA_QUALITY_THR_CONSTRAINTS
      && constraints
      && typeof constraints === 'object'
    ) {
      peer.peerConnection.getSenders().forEach((sender: RTCRtpSender) => {
        const { track } = sender;
        if (track && track.kind === 'video' && typeof track.applyConstraints === 'function') {
          const normalizedVideoConstraints = VideoService.reapplyResolutionIfNeeded(track, constraints);
          track.applyConstraints(normalizedVideoConstraints)
            .catch((error) => {
              logger.warn({
                logCode: 'video_provider_constraintchange_failed',
                extraInfo: { errorName: error.name, errorCode: error.code },
              }, 'Error applying camera profile');
            });
        }
      });
    }

    logger.info({
      logCode: 'video_provider_profile_applied',
      extraInfo: { profileId },
    }, `New camera profile applied: ${profileId}`);

    // @ts-expect-error -> Untyped object.
    // eslint-disable-next-line no-param-reassign
    peer.currentProfileId = profileId;
  }

  static getThreshold(numberOfPublishers: number) {
    let targetThreshold = { threshold: 0, profile: 'original' };
    let finalThreshold = { threshold: 0, profile: 'original' };

    for (let mapIndex = 0; mapIndex < CAMERA_QUALITY_THRESHOLDS.length; mapIndex += 1) {
      targetThreshold = CAMERA_QUALITY_THRESHOLDS[mapIndex];
      if (targetThreshold.threshold <= numberOfPublishers) {
        finalThreshold = targetThreshold;
      }
    }

    return finalThreshold;
  }

  getPreloadedStream() {
    if (this.deviceId == null) return null;
    return VideoPreviewService.getStream(this.deviceId);
  }

  updatePeerDictionaryReference(newRef: Record<string, WebRtcPeer>) {
    this.webRtcPeersRef = newRef;
  }

  setTrackEnabled(value: boolean) {
    const localPeers = Object.values(this.webRtcPeersRef).filter(
      // @ts-expect-error -> Until all codebase is in Typescript.
      (peer) => peer.isPublisher,
    );
    localPeers.forEach((peer) => {
      const stream = peer.getLocalStream();
      MediaStreamUtils.getVideoTracks(stream).forEach((track: MediaStreamTrack) => {
        // eslint-disable-next-line no-param-reassign
        track.enabled = value;
      });
    });
  }
}

const videoService = new VideoService();

export default {
  addCandidateToPeer: VideoService.addCandidateToPeer,
  getInfo: VideoService.getInfo,
  getMyStreamId: VideoService.getMyStreamId,
  getAuthenticatedURL: VideoService.getAuthenticatedURL,
  getRole: VideoService.getRole,
  getMediaServerAdapter: VideoService.getMediaServerAdapter,
  getCameraProfile: VideoService.getCameraProfile,
  getThreshold: VideoService.getThreshold,
  getPreviousVideoPage: VideoService.getPreviousVideoPage,
  getNextVideoPage: VideoService.getNextVideoPage,
  getCurrentVideoPageIndex: VideoService.getCurrentVideoPageIndex,
  isVideoPinEnabledForCurrentUser: VideoService.isVideoPinEnabledForCurrentUser,
  isLocalStream: VideoService.isLocalStream,
  isPaginationEnabled: VideoService.isPaginationEnabled,
  mirrorOwnWebcam: VideoService.mirrorOwnWebcam,
  processInboundIceQueue: VideoService.processInboundIceQueue,
  storeDeviceIds: VideoService.storeDeviceIds,
  exitedVideo: () => videoService.exitedVideo(),
  getPreloadedStream: () => videoService.getPreloadedStream(),
  getRecord: () => videoService.getRecord(),
  getPageChangeDebounceTime: () => { return PAGE_CHANGE_DEBOUNCE_TIME; },
  getUserParameterProfile: () => videoService.getUserParameterProfile(),
  isMultipleCamerasEnabled: () => videoService.isMultipleCamerasEnabled(),
  joinVideo: (deviceId: string) => videoService.joinVideo(deviceId),
  joinedVideo: () => videoService.joinedVideo(),
  shouldRenderPaginationToggle: () => videoService.shouldRenderPaginationToggle(),
  updateNumberOfDevices: (devices: MediaDeviceInfo[]) => videoService.updateNumberOfDevices(devices),
  stopConnectingStream: videoService.stopConnectingStream,
  updatePeerDictionaryReference: (
    newRef: Record<string, WebRtcPeer>,
  ) => videoService.updatePeerDictionaryReference(newRef),
  webRtcPeersRef: () => videoService.webRtcPeersRef,
  isMobile: videoService.isMobile,
  notify: (message: string) => notify(message, 'error', 'video'),
  applyCameraProfile: debounce(
    VideoService.applyCameraProfile,
    CAMERA_QUALITY_THR_DEBOUNCE,
    { leading: false, trailing: true },
  ),
  setTrackEnabled: (value: boolean) => videoService.setTrackEnabled(value),
};