/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

/**
 * Bugs 1287715 - Audio intermittently does not work.
 *
 * The site relies on unspecified behavior in Chromium and WebKit where
 * they will defer firing loadedmetadata events until after a listener
 * for the event is attached. We can mimic that behavior here.
 */

if (!window.__firefoxWebCompatFixBug1287715) {
  Object.defineProperty(window, "__firefoxWebCompatFixBug1287715", {
    configurable: false,
    value: true,
  });

  console.info(
    "loadedmetadata event is being deferred until GAME_READY. See https://bugzilla.mozilla.org/show_bug.cgi?id=1287715 for details."
  );

  let loadedmetadataEvent;
  let loadedmetadataListener;

  const { prototype } = EventTarget;
  const { addEventListener, dispatchEvent } = prototype;

  Object.defineProperty(prototype, "addEventListener", {
    value(type, listener, cfg) {
      if (type?.toLowerCase() === "loadedmetadata") {
        loadedmetadataListener = listener;
        return addEventListener.call(
          this,
          type,
          e => {
            loadedmetadataEvent = e;
          },
          cfg
        );
      }
      return addEventListener.call(this, type, listener, cfg);
    },
  });

  Object.defineProperty(prototype, "dispatchEvent", {
    value(e) {
      if (
        e?.type === "GAME_READY" &&
        loadedmetadataEvent &&
        loadedmetadataListener
      ) {
        try {
          (loadedmetadataListener?.handleEvent ?? loadedmetadataListener)(
            loadedmetadataEvent
          );
        } catch (_) {
          console.trace(_);
        }
        loadedmetadataListener = undefined;
        loadedmetadataEvent = undefined;
      }
      return dispatchEvent.call(this, e);
    },
  });
}