Compatible Shopify plugins

#opus-checkout-btn-2 .cd-main-button,button[name='checkout']

(function () {
  "use strict";

  var BUTTON_SELECTOR = "#opus-checkout-btn-2 .cd-main-button";
  var SUBSCRIPTION_SELECTOR = ".cd-product-item-selling-plan";
  var root = typeof shadowRoot !== "undefined"
    ? shadowRoot
    : document.querySelector("#opus-shadow-container")?.shadowRoot;

  if (!root) {
    console.error("Firmhouse checkout: Opus Shadow DOM not found.");
    return;
  }

  function checkoutButtonFromEvent(event) {
    return event.composedPath().find(function (element) {
      return element?.matches?.(BUTTON_SELECTOR);
    });
  }

  function cartContainsSubscription() {
    return !!root.querySelector(SUBSCRIPTION_SELECTOR);
  }

  root.addEventListener("click", function (event) {
    var button = checkoutButtonFromEvent(event);

    // Keep Opus's original checkout behavior for one-time purchases.
    if (!button || !cartContainsSubscription()) return;
    if (typeof window.firmhouse?.sepaCheckout !== "function") return;

    event.preventDefault();
    event.stopImmediatePropagation();

    button.disabled = true;
    button.classList.add("disabled");

    Promise.resolve(window.firmhouse.sepaCheckout(event)).catch(function (error) {
      button.disabled = false;
      button.classList.remove("disabled");
      console.error("Firmhouse checkout failed:", error);
    });
  }, true);
})();