/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 - present Instructure, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import { findDOMNode } from './findDOMNode'
import { UIElement } from '@instructure/shared-types'
import canUseDOM from './canUseDOM'

/**
 * ---
 * category: utilities/DOM
 * ---
 *
 * Retrieve the owner document of a specified element
 * @module ownerDocument
 * @param { Node | Window | React.ReactElement | function | null } el
 * @returns { Document | null} the owner document
 */
function ownerDocument(el?: UIElement) {
  const node = el && findDOMNode(el)
  let ownerDocument

  if (node && 'ownerDocument' in node) {
    ownerDocument = node.ownerDocument
  }
  const doc = canUseDOM ? window.document : undefined
  return ownerDocument || doc
}

export default ownerDocument
export { ownerDocument }