// Code for the WebExtension icon (AKA the "browser action").

import browser from "webextension-polyfill";
import {createValue} from "@holllo/webextension-storage";

import {
  nextItem,
  setBadgeText,
  openNextItemOrOptionsPage,
} from "../item/item.js";

/**
 * Handle single and double clicks for Firefox.
 * - For single click: open the next queued item or the options page if none are
 *   in the queue.
 * - For double click: open the options page.
 *
 * The reason this can't be done in Chromium is due to Manifest V3 running
 * background scripts in service workers where `setTimeout` doesn't work
 * reliably. The solution is to use `browser.alarms` instead, however, alarms
 * also don't work reliably for this use case because they can only run every
 * minute and we need milliseconds for this. And so, Chromium doesn't get double
 * click functionality.
 */
export async function firefoxActionClick(): Promise<void> {
  const timeoutId = await createValue<number | undefined>({
    deserialize: Number,
    key: "actionClickTimeoutId",
    value: undefined,
  });

  // If no ID is in storage, this is the first click so start a timeout and
  // save its ID.
  if (timeoutId.value === undefined) {
    timeoutId.value = window.setTimeout(async () => {
      // When no second click happens, open the next item or the options page.
      await openNextItemOrOptionsPage();
      await timeoutId.remove();
    }, 500);

    await timeoutId.save();
    return;
  }

  // If an ID is present in storage, this is the second click and we want to
  // open the options page instead.
  window.clearTimeout(timeoutId.value);
  await browser.runtime.openOptionsPage();
  await timeoutId.remove();
}