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import BezierEasing from 'bezier-easing'
import easings from './easings'
import _ from './utils'

const abortEvents = [
  'mousedown',
  'wheel',
  'DOMMouseScroll',
  'mousewheel',
  'keyup',
  'touchmove',
]

let defaults = {
  container: 'body',
  duration: 500,
  lazy: true,
  easing: 'ease',
  offset: 0,
  force: true,
  cancelable: true,
  onStart: false,
  onDone: false,
  onCancel: false,
  x: false,
  y: true,
}

export function setDefaults(options) {
  defaults = Object.assign({}, defaults, options)
}

export const scroller = () => {
  let element // element to scroll to
  let container // container to scroll
  let duration // duration of the scrolling
  let easing // easing to be used when scrolling
  let lazy // checks the target position at each step
  let offset // offset to be added (subtracted)
  let force // force scroll, even if element is visible
  let cancelable // indicates if user can cancel the scroll or not.
  let onStart // callback when scrolling is started
  let onDone // callback when scrolling is done
  let onCancel // callback when scrolling is canceled / aborted
  let x // scroll on x axis
  let y // scroll on y axis

  let initialX // initial X of container
  let targetX // target X of container
  let initialY // initial Y of container
  let targetY // target Y of container
  let diffX // difference
  let diffY // difference

  let abort // is scrolling aborted

  let cumulativeOffsetContainer
  let cumulativeOffsetElement

  let abortEv // event that aborted scrolling
  let abortFn = e => {
    if (!cancelable) return
    abortEv = e
    abort = true
  }
  let easingFn

  let timeStart // time when scrolling started
  let timeElapsed // time elapsed since scrolling started

  let progress // progress

  function scrollTop(container) {
    let scrollTop = container.scrollTop

    if (container.tagName.toLowerCase() === 'body') {
      // in firefox body.scrollTop always returns 0
      // thus if we are trying to get scrollTop on a body tag
      // we need to get it from the documentElement
      scrollTop = scrollTop || document.documentElement.scrollTop
    }

    return scrollTop
  }

  function scrollLeft(container) {
    let scrollLeft = container.scrollLeft

    if (container.tagName.toLowerCase() === 'body') {
      // in firefox body.scrollLeft always returns 0
      // thus if we are trying to get scrollLeft on a body tag
      // we need to get it from the documentElement
      scrollLeft = scrollLeft || document.documentElement.scrollLeft
    }

    return scrollLeft
  }

  function recalculateTargets() {
    cumulativeOffsetContainer = _.cumulativeOffset(container)
    cumulativeOffsetElement = _.cumulativeOffset(element)

    if (x) {
      targetX =
        cumulativeOffsetElement.left - cumulativeOffsetContainer.left + offset
      diffX = targetX - initialX
    }
    if (y) {
      targetY =
        cumulativeOffsetElement.top - cumulativeOffsetContainer.top + offset
      diffY = targetY - initialY
    }
  }

  function step(timestamp) {
    if (abort) return done()
    if (!timeStart) timeStart = timestamp

    // When a site has a lot of media that can be loaded asynchronously,
    // the targetY/targetX may end up in the wrong place during scrolling.
    // So we will check this at each step
    if (!lazy) {
      recalculateTargets()
    }

    timeElapsed = timestamp - timeStart

    progress = Math.min(timeElapsed / duration, 1)
    progress = easingFn(progress)

    topLeft(container, initialY + diffY * progress, initialX + diffX * progress)

    timeElapsed < duration ? window.requestAnimationFrame(step) : done()
  }

  function done() {
    if (!abort) topLeft(container, targetY, targetX)
    timeStart = false

    _.off(container, abortEvents, abortFn)
    if (abort && onCancel) onCancel(abortEv, element)
    if (!abort && onDone) onDone(element)
  }

  function topLeft(element, top, left) {
    if (y) element.scrollTop = top
    if (x) element.scrollLeft = left
    if (element.tagName.toLowerCase() === 'body') {
      // in firefox body.scrollTop doesn't scroll the page
      // thus if we are trying to scrollTop on a body tag
      // we need to scroll on the documentElement
      if (y) document.documentElement.scrollTop = top
      if (x) document.documentElement.scrollLeft = left
    }
  }

  function scrollTo(target, _duration, options = {}) {
    if (typeof _duration === 'object') {
      options = _duration
    } else if (typeof _duration === 'number') {
      options.duration = _duration
    }

    element = _.$(target)

    if (!element) {
      return console.warn(
        '[vue-scrollto warn]: Trying to scroll to an element that is not on the page: ' +
          target
      )
    }

    container = _.$(options.container || defaults.container)
    duration = options.hasOwnProperty('duration')
      ? options.duration
      : defaults.duration
    lazy = options.hasOwnProperty('lazy') ? options.lazy : defaults.lazy
    easing = options.easing || defaults.easing
    offset = options.hasOwnProperty('offset') ? options.offset : defaults.offset
    force = options.hasOwnProperty('force')
      ? options.force !== false
      : defaults.force
    cancelable = options.hasOwnProperty('cancelable')
      ? options.cancelable !== false
      : defaults.cancelable
    onStart = options.onStart || defaults.onStart
    onDone = options.onDone || defaults.onDone
    onCancel = options.onCancel || defaults.onCancel
    x = options.x === undefined ? defaults.x : options.x
    y = options.y === undefined ? defaults.y : options.y

    if (typeof offset === 'function') {
      offset = offset(element, container)
    }

    initialX = scrollLeft(container)
    initialY = scrollTop(container)

    // calculates cumulative offsets and targetX/Y + diffX/Y
    recalculateTargets()

    abort = false

    if (!force) {
      // When the container is the default (body) we need to use the viewport
      // height, not the entire body height
      const containerHeight =
        container.tagName.toLowerCase() === 'body'
          ? document.documentElement.clientHeight || window.innerHeight
          : container.offsetHeight
      const containerTop = initialY
      const containerBottom = containerTop + containerHeight
      const elementTop = targetY - offset
      const elementBottom = elementTop + element.offsetHeight
      if (elementTop >= containerTop && elementBottom <= containerBottom) {
        // make sure to call the onDone callback even if there is no need to
        // scroll the container. Fixes #111 (ref #118)
        if (onDone) onDone(element)
        return
      }
    }

    if (onStart) onStart(element)

    if (!diffY && !diffX) {
      if (onDone) onDone(element)
      return
    }

    if (typeof easing === 'string') {
      easing = easings[easing] || easings['ease']
    }

    easingFn = BezierEasing.apply(BezierEasing, easing)

    _.on(container, abortEvents, abortFn, { passive: true })

    window.requestAnimationFrame(step)

    return () => {
      abortEv = null
      abort = true
    }
  }

  return scrollTo
}

const _scroller = scroller()
export default _scroller