/*
 * Copyright (C) 2026 Mateusz Gruszczynski @linuxiarz.pl
 * Source-Available Code / Dual-Licensed.
 *
 * Free for non-commercial and evaluation use under terms of BSL/GPLv3.
 * Commercial or production use requires a valid paid license.
 * See LICENSE file in repository root for details.
 */

export function createRenderQueue(renderNow, schedule = queueMicrotask) {
  if (typeof renderNow !== "function") throw new TypeError("renderNow must be a function");
  if (typeof schedule !== "function") throw new TypeError("schedule must be a function");

  let rendering = false;
  let pending = false;
  let scheduled = false;

  const schedulePendingRender = () => {
    if (scheduled) return;
    scheduled = true;
    schedule(() => {
      scheduled = false;
      if (!pending) return;
      pending = false;
      render();
    });
  };

  function render() {
    if (rendering) {
      pending = true;
      schedulePendingRender();
      return;
    }

    pending = false;
    rendering = true;
    try {
      renderNow();
    } finally {
      rendering = false;
      if (pending) schedulePendingRender();
    }
  }

  return render;
}