import keyCode from '../../_util/KeyCode'

export function isEventFromHandle (e, handles) {
  return Object.keys(handles)
    .some(key => e.target === handles[key])
}

export function isValueOutOfRange (value, { min, max }) {
  return value < min || value > max
}

export function isNotTouchEvent (e) {
  return e.touches.length > 1 ||
    (e.type.toLowerCase() === 'touchend' && e.touches.length > 0)
}

export function getClosestPoint (val, { marks, step, min }) {
  const points = Object.keys(marks).map(parseFloat)
  if (step !== null) {
    const closestStep =
            Math.round((val - min) / step) * step + min
    points.push(closestStep)
  }
  const diffs = points.map(point => Math.abs(val - point))
  return points[diffs.indexOf(Math.min(...diffs))]
}

export function getPrecision (step) {
  const stepString = step.toString()
  let precision = 0
  if (stepString.indexOf('.') >= 0) {
    precision = stepString.length - stepString.indexOf('.') - 1
  }
  return precision
}

export function getMousePosition (vertical, e) {
  return vertical ? e.clientY : e.pageX
}

export function getTouchPosition (vertical, e) {
  return vertical ? e.touches[0].clientY : e.touches[0].pageX
}

export function getHandleCenterPosition (vertical, handle) {
  const coords = handle.getBoundingClientRect()
  return vertical
    ? coords.top + (coords.height * 0.5)
    : coords.left + (coords.width * 0.5)
}

export function ensureValueInRange (val, { max, min }) {
  if (val <= min) {
    return min
  }
  if (val >= max) {
    return max
  }
  return val
}

export function ensureValuePrecision (val, props) {
  const { step } = props
  const closestPoint = getClosestPoint(val, props)
  return step === null ? closestPoint
    : parseFloat(closestPoint.toFixed(getPrecision(step)))
}

export function pauseEvent (e) {
  e.stopPropagation()
  e.preventDefault()
}

export function getKeyboardValueMutator (e) {
  switch (e.keyCode) {
    case keyCode.UP:
    case keyCode.RIGHT:
      return (value, props) => value + props.step

    case keyCode.DOWN:
    case keyCode.LEFT:
      return (value, props) => value - props.step

    case keyCode.END: return (value, props) => props.max
    case keyCode.HOME: return (value, props) => props.min
    case keyCode.PAGE_UP: return (value, props) => value + props.step * 2
    case keyCode.PAGE_DOWN: return (value, props) => value - props.step * 2

    default: return undefined
  }
}