import { mount } from '@vue/test-utils'
import { asyncExpect } from '@/tests/utils'
import Carousel from '..'

describe('Carousel', () => {
  it('should has innerSlider', () => {
    const props = {
      slots: {
        default: '<div />',
      },
      sync: true,
    }
    const wrapper = mount(Carousel, props)
    const { innerSlider, $refs } = wrapper.vm
    const innerSliderFromRefs = $refs.slick.innerSlider
    expect(innerSlider).toBe(innerSliderFromRefs)
    expect(typeof innerSlider.slickNext).toBe('function')
  })

  it('should has prev, next and go function', async () => {
    const props = {
      slots: {
        default: '<div>1</div><div>2</div><div>3</div>',
      },
      sync: true,
    }
    const wrapper = mount(Carousel, props)
    const { prev, next, goTo } = wrapper.vm
    expect(typeof prev).toBe('function')
    expect(typeof next).toBe('function')
    expect(typeof goTo).toBe('function')
    const slick = wrapper.vm.$refs.slick

    expect(slick.innerSlider.currentSlide).toBe(0)
    wrapper.vm.goTo(2)
    await asyncExpect(() => {
      expect(slick.innerSlider.currentSlide).toBe(2)
    }, 1000)
    prev()
    await asyncExpect(() => {
      expect(slick.innerSlider.currentSlide).toBe(1)
    }, 1000)

    next()

    await asyncExpect(() => {
      expect(slick.innerSlider.currentSlide).toBe(2)
    }, 1000)
  })

  it('should trigger autoPlay after window resize', async () => {
    const props = {
      propsData: {
        autoplay: true,
      },
      slots: {
        default: '<div>1</div><div>2</div><div>3</div>',
      },
      sync: true,
    }
    const wrapper = mount(Carousel, props)
    const spy = jest.spyOn(wrapper.vm.$refs.slick.innerSlider, 'handleAutoPlay')
    window.resizeTo(1000)
    expect(spy).not.toBeCalled()
    await new Promise(resolve => setTimeout(resolve, 1000))
    expect(spy).toBeCalled()
  })

  it('cancel resize listener when unmount', async () => {
    const props = {
      propsData: {
        autoplay: true,
      },
      slots: {
        default: '<div>1</div><div>2</div><div>3</div>',
      },
      sync: true,
    }
    const wrapper = mount(Carousel, props)
    const onWindowResized = wrapper.vm.onWindowResized
    const spy = jest.spyOn(wrapper.vm.onWindowResized, 'cancel')
    const spy2 = jest.spyOn(window, 'removeEventListener')
    wrapper.destroy()
    expect(spy).toBeCalled()
    expect(spy2).toBeCalledWith('resize', onWindowResized)
  })
})