(async () => {
  let isDownloading = false;
  const webComponentButtonModule = "https://checkout.smile.pl/checkout_web_component_button.js.gz?v=1";
  const checkoutButtonSelector = "express-checkout";
  let checkoutCache = null;

  const checkoutSettings = {
    elementPrefix: checkoutButtonSelector,
    checkoutModuleURL: "https://checkout.smile.pl/checkout_module.js.gz?v=1",
    checkoutStyleURL: "https://checkout.smile.pl/checkout_styles.css.gz",
    checkoutFontFaceUrls: [{"url":"https:\/\/checkout.smile.pl\/fonts\/checkoutIcons.eot#iefix","type":"embedded-opentype"},{"url":"https:\/\/checkout.smile.pl\/fonts\/checkoutIcons.woff?v=2","type":"woff"},{"url":"https:\/\/checkout.smile.pl\/fonts\/checkoutIcons.ttf","type":"truetype"},{"url":"https:\/\/checkout.smile.pl\/fonts\/checkoutIcons.svg#fontello","type":"svg"}],
    buttonSystemStyles: {"--checkout-button-border-radius":"0","--checkout-button-background-color":"#fc3240","--checkout-button-border-color":"#fc3240","--checkout-button-background-color-hover":"#333","--checkout-button-border-color-hover":"#333","--checkout-button-text-color":"#fff","--checkout-button-text-color-hover":"#fff"},
    graphql: "/graphql/v1/",
    returnUrl: "https://artkoszulka.pl/pl/return.html",
    basketUrl: "https://artkoszulka.pl/pl/basketedit.html",
    IAIAccountsUrl: "https://artkoszulka.pl/",
    cancelOrderUrl: "/pl/returns-and_replacements.html",
    translationsUrl: "https://checkout.smile.pl/translations",
    clientBalance: "",
    language: "pol",
    login: "",
    loginType: "pin",
    isLogged: false,
    lastLoginOption: "",
  };

  async function loadCheckoutModule() {
    if (!webComponentButtonModule) {
      console.warn(`checkoutInit.loadCheckoutModule: nie znaleziono linku do modułu checkoutu!`);
      return false;
    }

    const checkoutButtonElement = document.querySelector(checkoutButtonSelector);
    if (!checkoutButtonElement) return false;
    if (isDownloading) return false;

    try {
      isDownloading = true;
      const loadedModule = checkoutCache || (await import(webComponentButtonModule));
      if (!("initCheckoutButton" in loadedModule)) {
        console.warn(`checkoutInit.loadCheckoutModule: nie znaleziono funkcji inicjalizującej w pobranym module`);
        return false;
      }
      if (!checkoutCache) {
        checkoutCache = loadedModule;
      }

      await loadedModule.initCheckoutButton(checkoutSettings);
      return true;
    } catch (err) {
      console.warn(`checkoutInit.loadCheckoutModule: błąd pobierania modułu checkoutu`, err);
      return false;
    } finally {
      isDownloading = false;
    }
  }

  window.addEventListener("DOMContentLoaded", async () => {
    await loadCheckoutModule();
  });

  await loadCheckoutModule();
})();