import { getScrollbarWidth, needsScrollbar } from "../shared/utils";

import { useScrollLock as _useScrollLock, tryOnBeforeUnmount, tryOnMounted } from "@vueuse/core";

export const SCROLL_FIXED_CLASS = `_scroll__fixed_`;

export function useScrollLock() {
  const isLocked = _useScrollLock(document.body);
  const scrollbarWidth = getScrollbarWidth();

  tryOnMounted(() => {
    if (!needsScrollbar()) {
      return;
    }
    document.body.style.paddingRight = `${scrollbarWidth}px`;

    const layoutFixedNodes = document.querySelectorAll<HTMLElement>(`.${SCROLL_FIXED_CLASS}`);
    const nodes = [...layoutFixedNodes];
    if (nodes.length > 0) {
      nodes.forEach(node => {
        node.dataset.transition = node.style.transition;
        node.style.transition = "none";
        node.style.paddingRight = `${scrollbarWidth}px`;
      });
    }
    isLocked.value = true;
  });

  tryOnBeforeUnmount(() => {
    if (!needsScrollbar()) {
      return;
    }
    isLocked.value = false;
    const layoutFixedNodes = document.querySelectorAll<HTMLElement>(`.${SCROLL_FIXED_CLASS}`);
    const nodes = [...layoutFixedNodes];
    if (nodes.length > 0) {
      nodes.forEach(node => {
        node.style.paddingRight = "";
        requestAnimationFrame(() => {
          node.style.transition = node.dataset.transition || "";
        });
      });
    }
    document.body.style.paddingRight = "";
  });
}