import { check } from 'meteor/check';
import Logger from '/imports/startup/server/logger';
import Users from '/imports/api/users';
import Meetings from '/imports/api/meetings';
import VoiceUsers from '/imports/api/voice-users/';

import stringHash from 'string-hash';
import flat from 'flat';

import addVoiceUser from '/imports/api/voice-users/server/modifiers/addVoiceUser';
import changeRole from '/imports/api/users/server/modifiers/changeRole';

const COLOR_LIST = [
  '#7b1fa2', '#6a1b9a', '#4a148c', '#5e35b1', '#512da8', '#4527a0',
  '#311b92', '#3949ab', '#303f9f', '#283593', '#1a237e', '#1976d2', '#1565c0',
  '#0d47a1', '#0277bd', '#01579b',
];

export default function addUser(meetingId, user) {
  check(meetingId, String);

  check(user, {
    intId: String,
    extId: String,
    name: String,
    role: String,
    guest: Boolean,
    authed: Boolean,
    waitingForAcceptance: Match.Maybe(Boolean),
    guestStatus: String,
    emoji: String,
    presenter: Boolean,
    locked: Boolean,
    avatar: String,
    clientType: String,
  });

  const userId = user.intId;
  check(userId, String);

  const selector = {
    meetingId,
    userId,
  };

  const USER_CONFIG = Meteor.settings.public.user;
  const ROLE_PRESENTER = USER_CONFIG.role_presenter;
  const ROLE_MODERATOR = USER_CONFIG.role_moderator;
  const ROLE_VIEWER = USER_CONFIG.role_viewer;
  const APP_CONFIG = Meteor.settings.public.app;
  const ALLOW_HTML5_MODERATOR = APP_CONFIG.allowHTML5Moderator;

  const Meeting = Meetings.findOne({ meetingId });
  // override moderator status of html5 client users, depending on a system flag
  const dummyUser = Users.findOne(selector);
  let userRole = user.role;

  if (
    dummyUser
    && dummyUser.clientType === 'HTML5'
    && userRole === ROLE_MODERATOR
    && !ALLOW_HTML5_MODERATOR
  ) {
    userRole = ROLE_VIEWER;
  }

  /* While the akka-apps dont generate a color we just pick one
    from a list based on the userId */
  const color = COLOR_LIST[stringHash(user.intId) % COLOR_LIST.length];

  const modifier = {
    $set: Object.assign(
      {
        meetingId,
        connectionStatus: 'online',
        roles: [ROLE_VIEWER.toLowerCase()],
        sortName: user.name.trim().toLowerCase(),
        color,
        breakoutProps: {
          isBreakoutUser: Meeting.meetingProp.isBreakout,
          parentId: Meeting.breakoutProps.parentId,
        },
        inactivityCheck: false,
        responseDelay: 0,
      },
      flat(user),
    ),
  };

  // Only add an empty VoiceUser if there isn't one already. We want to avoid overwriting good data
  if (!VoiceUsers.findOne({ meetingId, intId: userId })) {
    addVoiceUser(meetingId, {
      voiceUserId: '',
      intId: userId,
      callerName: user.name,
      callerNum: '',
      muted: false,
      talking: false,
      callingWith: '',
      listenOnly: false,
      voiceConf: '',
      joined: false,
    });
  }

  const cb = (err, numChanged) => {
    if (err) {
      return Logger.error(`Adding user to collection: ${err}`);
    }

    if (user.presenter) {
      changeRole(ROLE_PRESENTER, true, userId, meetingId);
    }

    if (userRole === ROLE_MODERATOR) {
      changeRole(ROLE_MODERATOR, true, userId, meetingId);
    }

    const { insertedId } = numChanged;
    if (insertedId) {
      return Logger.info(`Added user id=${userId} meeting=${meetingId}`);
    }

    return Logger.info(`Upserted user id=${userId} meeting=${meetingId}`);
  };

  return Users.upsert(selector, modifier, cb);
}