/*
 * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
 *
 * 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 NON-INFRINGEMENT. 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.
 */

/* ----------------------------------------------------------------------------
 * Functions
 * ------------------------------------------------------------------------- */

/**
 * Set focusable property
 *
 * @param el - Element
 * @param value - Tabindex value
 */
export function setFocusable(
  el: HTMLElement, value = 0
): void {
  el.setAttribute("tabindex", value.toString())
}

/**
 * Reset focusable property
 *
 * @param el - Element
 */
export function resetFocusable(
  el: HTMLElement
): void {
  el.removeAttribute("tabindex")
}

/**
 * Set scroll lock
 *
 * @param el - Scrollable element
 * @param value - Vertical offset
 */
export function setScrollLock(
  el: HTMLElement, value: number
): void {
  el.setAttribute("data-md-state", "lock")
  el.style.top = `-${value}px`
}

/**
 * Reset scroll lock
 *
 * @param el - Scrollable element
 */
export function resetScrollLock(
  el: HTMLElement
): void {
  const value = -1 * parseInt(el.style.top, 10)
  el.removeAttribute("data-md-state")
  el.style.top = ""
  if (value)
    window.scrollTo(0, value)
}