/*
 * Copyright (C) 2026 Mateusz Gruszczyński @linuxiarz.pl
 * Source-Available Code / Dual-Licensed.
 */

const config = window.__RUSTPAD_CONFIG__ || {};
const assetVersion = encodeURIComponent(String(config.assetVersion || "dev"));
const promiseCache = new Map();

function localAsset(path) {
  const separator = path.includes("?") ? "&" : "?";
  return `${path}${separator}v=${assetVersion}`;
}

function once(key, factory) {
  if (!promiseCache.has(key)) promiseCache.set(key, Promise.resolve().then(factory));
  return promiseCache.get(key);
}

function loadClassicScript(path, globalName) {
  return once(path, () => new Promise((resolve, reject) => {
    const existing = document.querySelector(`script[data-rustpad-lib="${globalName}"]`);
    if (existing && window[globalName]) {
      resolve(window[globalName]);
      return;
    }
    const script = existing || document.createElement("script");
    script.src = localAsset(path);
    script.async = true;
    script.dataset.rustpadLib = globalName;
    script.addEventListener("load", () => {
      if (window[globalName]) resolve(window[globalName]);
      else reject(new Error(`${globalName} did not register a browser global.`));
    }, { once: true });
    script.addEventListener("error", () => reject(new Error(`Failed to load ${path}.`)), { once: true });
    if (!existing) document.head.append(script);
  }));
}

export function loadHighlight() {
  return loadClassicScript("/assets/libs/highlight/highlight.min.js", "hljs");
}

export function loadMermaid() {
  return once("mermaid", async () => {
    const module = await import(localAsset("/assets/libs/mermaid/mermaid.esm.min.mjs"));
    return module.default;
  });
}

export function loadMediaPlayer() {
  return once("rustpad-player", () => import(localAsset("/assets/libs/rustpad-player/player.js")));
}