dom.js

import { isRef } from 'vue'

export function offset (el) {
  if (el === window) {
    return { top: 0, left: 0 }
  }
  const { top, left } = el.getBoundingClientRect()
  return { top, left }
}

export function style (el, property) {
  return window.getComputedStyle(el).getPropertyValue(property)
}

export function height (el) {
  return el === window
    ? window.innerHeight
    : el.getBoundingClientRect().height
}

export function width (el) {
  return el === window
    ? window.innerWidth
    : el.getBoundingClientRect().width
}

export function css (element, css) {
  const style = element.style

  for (const prop in css) {
    style[ prop ] = css[ prop ]
  }
}

export function cssBatch (elements, style) {
  elements.forEach(el => css(el, style))
}

export function ready (fn) {
  if (typeof fn !== 'function') {
    return
  }

  if (document.readyState !== 'loading') {
    return fn()
  }

  document.addEventListener('DOMContentLoaded', fn, false)
}

// internal
export function getElement (el) {
  if (el === void 0 || el === null) {
    return void 0
  }

  if (typeof el === 'string') {
    try {
      return document.querySelector(el) || void 0
    }
    catch (err) {
      return void 0
    }
  }

  const target = isRef(el) === true
    ? el.value
    : el

  if (target) {
    return target.$el || target
  }
}

// internal
export function childHasFocus (el, focusedEl) {
  if (el === void 0 || el === null || el.contains(focusedEl) === true) {
    return true
  }

  for (let next = el.nextElementSibling; next !== null; next = next.nextElementSibling) {
    if (next.contains(focusedEl)) {
      return true
    }
  }

  return false
}

export default {
  offset,
  style,
  height,
  width,
  css,
  cssBatch,
  ready
}