import BScroll from 'scroll/index'
import { dispatchTouchStart, dispatchTouchMove, dispatchSwipe } from '../../utils/event'

describe('BScroll - core scroll', () => {
  let scroll
  let scroller
  let scrollOptions = {
    bindToWrapper: true,
    probeType: 3,
    deceleration: 0.001
  }
  beforeEach(() => {
    const wrapper = document.createElement('div')
    const list = document.createElement('ul')
    scroller = document.createElement('div')
    scroller.appendChild(list)
    wrapper.appendChild(scroller)
    document.body.appendChild(wrapper)
    wrapper.style.height = '500px'
    wrapper.style.overflow = 'hidden'
    let listHTML = ''
    list.style.margin = '0'
    for (let i = 0; i < 100; i++) {
      listHTML += `<li>${i}</li>`
    }
    list.innerHTML = listHTML
    scroll = new BScroll(wrapper, scrollOptions)
  })
  afterEach(() => {
    if (scroll) {
      document.body.removeChild(scroll.wrapper)
      scroll.destroy()
    }
  })
  it('start', () => {
    const wrapper = scroll.wrapper
    const startHandler = sinon.spy()
    scroll.on('beforeScrollStart', startHandler)
    dispatchTouchStart(wrapper, {
      pageX: 100,
      pageY: 50
    })
    expect(startHandler)
      .to.be.calledOnce
    expect(scroll.pointX)
      .to.equal(100)
    expect(scroll.pointY)
      .to.equal(50)
  })
  it('move', () => {
    const wrapper = scroll.wrapper
    const startHandler = sinon.spy()
    const scrollHandler = sinon.spy()
    scroll.on('scrollStart', startHandler)
    scroll.on('scroll', scrollHandler)
    dispatchTouchStart(wrapper, {
      pageX: 100,
      pageY: 100
    })
    dispatchTouchMove(wrapper, {
      pageX: 100,
      pageY: 50
    })
    expect(startHandler)
      .to.be.calledOnce
    expect(scrollHandler)
      .to.be.calledOnce
  })
  it('end', (done) => {
    const wrapper = scroll.wrapper
    const endHandler = sinon.spy()
    scroll.on('touchEnd', endHandler)
    scroll.on('scrollEnd', () => {
      done()
    })
    dispatchSwipe(wrapper, [
      {
        pageX: 100,
        pageY: 100
      },
      {
        pageX: 100,
        pageY: 80
      }
    ], 100, () => {
      expect(endHandler)
        .to.be.calledOnce
    })
    expect(scroll.x)
      .to.equal(0)
    expect(scroll.y)
      .to.equal(0)
  })
  it('scrollStop', (done) => {
    const endHandler = sinon.spy()
    scroll.on('scrollEnd', endHandler)
    scroll.scrollToElement(scroller, 100000, 0, 500)
    setTimeout(() => {
      scroll.stop()
      expect(endHandler)
        .to.be.calledOnce
      done()
    }, 5000)
  })
  it('scrollToElement', () => {
    scroll.scrollToElement(scroller, 1000, 0, 500)
    expect(scroll.y)
      .to.equal(-500)
    scroll.scrollToElement(scroller, 1000, 0, 400)
    expect(scroll.y)
      .to.equal(-400)
  })
  it('scrollBy', () => {
    scroll.scrollBy(0, -300, 1000)
    expect(scroll.y)
      .to.equal(-300)
    scroll.scrollBy(0, -200, 1000)
    expect(scroll.y)
      .to.equal(-500)
  })
  it('resize', (done) => {
    const refreshHandle = sinon.spy()
    scroll.on('refresh', refreshHandle)
    if (document.createEvent) {
      var event = document.createEvent('HTMLEvents')
      event.initEvent('resize', true, true)
      window.dispatchEvent(event)
    } else if (document.createEventObject) {
      window.fireEvent('onresize')
    }
    setTimeout(() => {
      expect(refreshHandle)
        .to.be.called
      done()
    }, 5000)
  })
})