import { Meteor } from 'meteor/meteor';
import { WebAppInternals } from 'meteor/webapp';
import Langmap from 'langmap';
import fs from 'fs';
import Users from '/imports/api/users';
import './settings';
import { lookup as lookupUserAgent } from 'useragent';
import { check } from 'meteor/check';
import Logger from './logger';
import Redis from './redis';

import setMinBrowserVersions from './minBrowserVersion';

let guestWaitHtml = '';
const AVAILABLE_LOCALES = fs.readdirSync('assets/app/locales');
const FALLBACK_LOCALES = JSON.parse(Assets.getText('config/fallbackLocales.json'));

process.on('uncaughtException', (err) => {
  Logger.error(`uncaughtException: ${err}`);
  process.exit(1);
});

process.on('uncaughtException', (err) => {
  Logger.error(`uncaughtException: ${err}`);
  process.exit(1);
});

Meteor.startup(() => {
  const APP_CONFIG = Meteor.settings.public.app;
  const env = Meteor.isDevelopment ? 'development' : 'production';
  const CDN_URL = APP_CONFIG.cdn;
  const instanceId = APP_CONFIG.instanceId.slice(1); // remove the leading '/' character

  Logger.warn('Started bbb-html5 process with instanceId=' + instanceId);

  const { customHeartbeat } = APP_CONFIG;

  if (customHeartbeat) {
    Logger.warn('Custom heartbeat functions are enabled');
    // https://github.com/sockjs/sockjs-node/blob/1ef08901f045aae7b4df0f91ef598d7a11e82897/lib/transport/websocket.js#L74-L82
    const newHeartbeat = function heartbeat() {
      const currentTime = new Date().getTime();

      // Skipping heartbeat, because websocket is sending data
      if (currentTime - this.ws.lastSentFrameTimestamp < 10000) {
        try {
          Logger.info('Skipping heartbeat, because websocket is sending data', {
            currentTime,
            lastSentFrameTimestamp: this.ws.lastSentFrameTimestamp,
            userId: this.session.connection._meteorSession.userId,
          });
          return;
        } catch (err) {
          Logger.error(`Skipping heartbeat error: ${err}`);
        }
      }

      const supportsHeartbeats = this.ws.ping(null, () => clearTimeout(this.hto_ref));
      if (supportsHeartbeats) {
        this.hto_ref = setTimeout(() => {
          try {
            Logger.info('Heartbeat timeout', { userId: this.session.connection._meteorSession.userId, sentAt: currentTime, now: new Date().getTime() });
          } catch (err) {
            Logger.error(`Heartbeat timeout error: ${err}`);
          }
        }, Meteor.server.options.heartbeatTimeout);
      } else {
        Logger.error('Unexpected error supportsHeartbeats=false');
      }
    };

    // https://github.com/davhani/hagty/blob/6a5c78e9ae5a5e4ade03e747fb4cc8ea2df4be0c/faye-websocket/lib/faye/websocket/api.js#L84-L88
    const newSend = function send(data) {
      try {
        this.lastSentFrameTimestamp = new Date().getTime();

        if (this.meteorHeartbeat) {
          // Call https://github.com/meteor/meteor/blob/1e7e56eec8414093cd0c1c70750b894069fc972a/packages/ddp-common/heartbeat.js#L80-L88
          this.meteorHeartbeat._seenPacket = true;
          if (this.meteorHeartbeat._heartbeatTimeoutHandle) {
            this.meteorHeartbeat._clearHeartbeatTimeoutTimer();
          }
        }

        if (this.readyState > 1/* API.OPEN = 1 */) return false;
        if (!(data instanceof Buffer)) data = String(data);
        return this._driver.messages.write(data);
      } catch (err) {
        console.error('Error on send data', err);
        return false;
      }
    };

    Meteor.setInterval(() => {
      for (const session of Meteor.server.sessions.values()) {
        const { socket } = session;
        const recv = socket._session.recv;

        if (session.bbbFixApplied || !recv || !recv.ws) {
          continue;
        }

        recv.ws.meteorHeartbeat = session.heartbeat;
        recv.__proto__.heartbeat = newHeartbeat;
        recv.ws.__proto__.send = newSend;
        session.bbbFixApplied = true;
      }
    }, 5000);

    if (CDN_URL.trim()) {
      // Add CDN
      BrowserPolicy.content.disallowEval();
      BrowserPolicy.content.allowInlineScripts();
      BrowserPolicy.content.allowInlineStyles();
      BrowserPolicy.content.allowImageDataUrl(CDN_URL);
      BrowserPolicy.content.allowFontDataUrl(CDN_URL);
      BrowserPolicy.content.allowOriginForAll(CDN_URL);
      WebAppInternals.setBundledJsCssPrefix(CDN_URL + APP_CONFIG.basename + Meteor.settings.public.app.instanceId);

      const fontRegExp = /\.(eot|ttf|otf|woff|woff2)$/;

      WebApp.rawConnectHandlers.use('/', (req, res, next) => {
        if (fontRegExp.test(req._parsedUrl.pathname)) {
          res.setHeader('Access-Control-Allow-Origin', '*');
          res.setHeader('Vary', 'Origin');
          res.setHeader('Pragma', 'public');
          res.setHeader('Cache-Control', '"public"');
        }
        return next();
      });
    }

    setMinBrowserVersions();

    Logger.warn(`SERVER STARTED.\nENV=${env},\nnodejs version=${process.version}\nCDN=${CDN_URL}\n`, APP_CONFIG);
  }
});


const generateLocaleOptions = () => {
  try {
    Logger.warn('Calculating aggregateLocales (heavy)');
    const tempAggregateLocales = AVAILABLE_LOCALES
      .map(file => file.replace('.json', ''))
      .map(file => file.replace('_', '-'))
      .map((locale) => {
        const localeName = (Langmap[locale] || {}).nativeName
          || (FALLBACK_LOCALES[locale] || {}).nativeName
          || locale;
        return {
          locale,
          name: localeName,
        };
      });
    Logger.warn(`Total locales: ${tempAggregateLocales.length}`, tempAggregateLocales);
    return tempAggregateLocales;
  } catch (e) {
    Logger.error(`'Could not process locales error: ${e}`);
    return [];
  }
};

let avaibleLocalesNamesJSON = JSON.stringify(generateLocaleOptions());

WebApp.connectHandlers.use('/check', (req, res) => {
  const payload = { html5clientStatus: 'running' };

  res.setHeader('Content-Type', 'application/json');
  res.writeHead(200);
  res.end(JSON.stringify(payload));
});

WebApp.connectHandlers.use('/locale', (req, res) => {
  const APP_CONFIG = Meteor.settings.public.app;
  const fallback = APP_CONFIG.defaultSettings.application.fallbackLocale;
  const override = APP_CONFIG.defaultSettings.application.overrideLocale;
  const browserLocale = override && req.query.init === 'true'
    ? override.split(/[-_]/g) : req.query.locale.split(/[-_]/g);

  const localeList = [fallback];

  const usableLocales = AVAILABLE_LOCALES
    .map(file => file.replace('.json', ''))
    .reduce((locales, locale) => (locale.match(browserLocale[0])
      ? [...locales, locale]
      : locales), []);

  const regionDefault = usableLocales.find(locale => browserLocale[0] === locale);

  if (regionDefault) localeList.push(regionDefault);
  if (!regionDefault && usableLocales.length) localeList.push(usableLocales[0]);

  let normalizedLocale;
  let messages = {};

  if (browserLocale.length > 1) {
    normalizedLocale = `${browserLocale[0]}_${browserLocale[1].toUpperCase()}`;
    localeList.push(normalizedLocale);
  }

  localeList.forEach((locale) => {
    try {
      const data = Assets.getText(`locales/${locale}.json`);
      messages = Object.assign(messages, JSON.parse(data));
      normalizedLocale = locale;
    } catch (e) {
      Logger.info(`'Could not process locale ${locale}:${e}`);
      // Getting here means the locale is not available in the current locale files.
    }
  });

  res.setHeader('Content-Type', 'application/json');
  res.end(JSON.stringify({ normalizedLocale, messages }));
});

WebApp.connectHandlers.use('/locales', (req, res) => {
  if (!avaibleLocalesNamesJSON) {
    avaibleLocalesNamesJSON = JSON.stringify(generateLocaleOptions());
  }

  res.setHeader('Content-Type', 'application/json');
  res.writeHead(200);
  res.end(avaibleLocalesNamesJSON);
});

WebApp.connectHandlers.use('/feedback', (req, res) => {
  req.on('data', Meteor.bindEnvironment((data) => {
    const body = JSON.parse(data);
    const {
      meetingId,
      userId,
      authToken,
      userName: reqUserName,
      comment,
      rating,
    } = body;

    check(meetingId, String);
    check(userId, String);
    check(authToken, String);
    check(reqUserName, String);
    check(comment, String);
    check(rating, Number);

    const user = Users.findOne({
      meetingId,
      userId,
      authToken,
    });

    if (!user) {
      Logger.warn('Couldn\'t find user for feedback');
    }

    res.setHeader('Content-Type', 'application/json');
    res.writeHead(200);
    res.end(JSON.stringify({ status: 'ok' }));

    body.userName = user ? user.name : `[unconfirmed] ${reqUserName}`;

    const feedback = {
      ...body,
    };
    Logger.info('FEEDBACK LOG:', feedback);
  }));
});

WebApp.connectHandlers.use('/useragent', (req, res) => {
  const userAgent = req.headers['user-agent'];
  let response = 'No user agent found in header';
  if (userAgent) {
    response = lookupUserAgent(userAgent).toString();
  }

  Logger.info(`The requesting user agent is ${response}`);

  // res.setHeader('Content-Type', 'application/json');
  res.writeHead(200);
  res.end(response);
});

WebApp.connectHandlers.use('/guestWait', (req, res) => {
  if (!guestWaitHtml) {
    try {
      guestWaitHtml = Assets.getText('static/guest-wait/guest-wait.html');
    } catch (e) {
      Logger.warn(`Could not process guest wait html file: ${e}`);
    }
  }

  res.setHeader('Content-Type', 'text/html');
  res.writeHead(200);
  res.end(guestWaitHtml);
});


export const eventEmitter = Redis.emitter;

export const redisPubSub = Redis;