const logger = require('winston');
const ua = require('universal-analytics');
const { analytics : { googleId }, site: { name: siteName } } = require('../config/speechConfig.js');

function createServeEventParams (headers, ip, originalUrl) {
  return {
    eventCategory    : 'client requests',
    eventAction      : 'serve request',
    eventLabel       : originalUrl,
    ipOverride       : ip,
    userAgentOverride: headers['user-agent'],
  };
};

function createPublishTimingEventParams (category, variable, label, startTime, endTime) {
  const durration = endTime - startTime;
  return {
    userTimingCategory    : category,
    userTimingVariableName: variable,
    userTimingTime        : durration,
    userTimingLabel       : label,
  };
};

function sendGoogleAnalyticsEvent (ip, params) {
  const visitorId = ip.replace(/\./g, '-');
  const visitor = ua(googleId, visitorId, { strictCidFormat: false, https: true });
  visitor.event(params, (err) => {
    if (err) {
      logger.error('Google Analytics Event Error >>', err);
    }
  });
};

function sendGoogleAnalyticsTiming (visitorId, params) {
  const visitor = ua(googleId, visitorId, { strictCidFormat: false, https: true });
  visitor.timing(params, (err) => {
    if (err) {
      logger.error('Google Analytics Event Error >>', err);
    }
    logger.debug(`Timing event successfully sent to google analytics`);
  });
};

module.exports = {
  sendGAServeEvent (headers, ip, originalUrl) {
    const params = createServeEventParams(headers, ip, originalUrl);
    sendGoogleAnalyticsEvent(ip, params);
  },
  sendGATimingEvent (category, variable, label, startTime, endTime) {
    const params = createPublishTimingEventParams(category, variable, label, startTime, endTime);
    sendGoogleAnalyticsTiming(siteName, params);
  },
  chooseGaPublishLabel (publishParams) {
    if (publishParams.channel_name || publishParams.channel_id) {
      return 'PUBLISH_IN_CHANNEL_CLAIM';
    }
    return 'PUBLISH_ANONYMOUS_CLAIM';
  },
};