import { isCrawler, addMonthToDate, getEventObject, httpRequest } from './helpers'

const userAgent =
  'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36'

const _Date = Date

const mockDate = () => {
  const MOCKED_DATE = new Date(2017, 10, 21, 23, 10, 20)
  ;(global as any).Date = jest.fn(() => MOCKED_DATE)
}
const resetDate = () => {
  ;(global as any).Date = _Date
}

describe('Helper', () => {
  describe('isCrawler', () => {
    it('Should not be flagged as a crawler', () => {
      expect(isCrawler(userAgent)).toBe(false)
    })

    it('Should be flagged as a crawler', () => {
      expect(isCrawler('googlebot user agent')).toBe(true)
    })

    it('Should be flagged as a crawler (case insensitive', () => {
      expect(isCrawler('GOOGLEBOT user agent')).toBe(true)
    })
  })

  describe('addMonthToDate', () => {
    beforeEach(mockDate)

    it('Should render the date', () => {
      expect(
        addMonthToDate(0)
          .toString()
          .startsWith('Tue Nov 21 2017 23:10:20')
      ).toBe(true)
    })

    it('Should render the date with 1 more month', () => {
      expect(
        addMonthToDate(1)
          .toString()
          .startsWith('Thu Dec 21 2017 23:10:20')
      ).toBe(true)
    })

    it('Should render the date with 2 more month and a change of year', () => {
      expect(
        addMonthToDate(2)
          .toString()
          .startsWith('Sun Jan 21 2018 23:10:20')
      ).toBe(true)
    })

    afterEach(resetDate)
  })

  describe('getEventObject', () => {
    beforeEach(mockDate)

    it('Should render a Tracktor event', () => {
      expect(getEventObject('name', 1, {})).toEqual({
        name: 'name',
        version: 1,
        payload: {},
        created_at_client_local: '2017-11-21T23:10:20+01:00',
      })
    })

    afterEach(resetDate)
  })

  describe('httpRequest', () => {
    const url = 'url'
    const opts = { body: { parameter: 'value' } }
    global.fetch = jest.fn().mockImplementation(() => Promise.resolve({ ok: true }))

    beforeEach(() => {
      navigator.sendBeacon = undefined
    })

    it('Should use sendBeacon if this is available', () => {
      navigator.sendBeacon = jest.fn()
      httpRequest(url, opts)
      expect(navigator.sendBeacon).toHaveBeenCalledWith(url, opts.body)
    })

    it('Should use fetch if sendBeacon is not available', () => {
      httpRequest(url, opts)
      expect(global.fetch).toHaveBeenCalled()
    })
  })
})