import 'isomorphic-fetch'
import { Event, TracktorConfig } from './interfaces'
import rfc3339 from './rfc3339'

/**
 * The list of Google bots: https://support.google.com/webmasters/answer/1061943?hl=en
 *
 * @param {String} userAgent
 * @return {Date}
 */
export const isCrawler = (userAgent = ''): boolean => {
  const crawlerList = [
    'bingbot',
    'slurp',
    'msnbot',
    'java',
    'xget',
    'wget',
    'curl',
    'spider',
    'googlebot',
    'googlebot-mobile',
    'apis-google',
    'mediapartners-google',
    'adsbot-google-mobile',
    'adsbot-google',
    'googlebot-image',
    'googlebot-news',
    'googlebot-video',
    'adsbot-google-mobile-apps',
  ]
  return crawlerList.some(crawlerName => userAgent.toLowerCase().includes(crawlerName))
}

/**
 * @param {Number} months months to extend the date
 * @return {Date}
 */
export const addMonthToDate = (months: number): Date => {
  const newDate = new Date()
  newDate.setMonth(newDate.getMonth() + Number(months))
  return new Date(newDate)
}

/**
 * Format the object into a Tracktor event
 * @param {String} name      Event name
 * @param {Number} version   Event version
 * @param {Object} payload   Event payload
 */
export const getEventObject = (name: string, version: number, payload: object): Event => ({
  name,
  version,
  payload,
  created_at_client_local: rfc3339(),
})

export const tracktorConfig: Partial<TracktorConfig> = {
  emit_frequency: 2000,
  event_max_count: 20,
  event_max_size: 2500,
  request_max_size: 10000,
  retries_frequency: 6500,
  retries_max: 5,
  onSendFailure: () => {},
}

export const httpRequest = (url, opts): Promise<{ ok: boolean }> => {
  if (navigator.sendBeacon !== undefined) {
    navigator.sendBeacon(url, opts.body)
    return Promise.resolve({ ok: true })
  } else {
    return fetch(url, opts)
  }
}