/**
 * VITEC – Structured Data generator button (FormEngine fieldWizard).
 * EXT:vitec/Resources/Public/Javascript/structured-data-generator.js
 *
 * Self-initializing: on load it installs a single delegated click handler for
 * any button matching [data-vitec-sd-generate]. This avoids relying on the
 * JavaScriptModuleInstruction ->instance() payload (which is unreliable for
 * fieldWizards) and also works for fields added to the DOM later.
 *
 * On click it calls the backend AJAX endpoint for the product uid and writes
 * the returned JSON-LD string into the associated `structureddata` textarea.
 * The textarea is resolved by its form name (data-field-name) with a fallback
 * to the surrounding FormEngine field-item container.
 */
import DocumentService from "@typo3/core/document-service.js";
import AjaxRequest from "@typo3/core/ajax/ajax-request.js";
import Notification from "@typo3/backend/notification.js";

const SELECTOR = "[data-vitec-sd-generate]";

function findField(button) {
  const name = button.dataset.fieldName;
  if (name) {
    const byName = document.querySelector('[name="' + name + '"]');
    if (byName !== null) {
      return byName;
    }
  }
  const item = button.closest(".t3js-formengine-field-item");
  if (item !== null) {
    return item.querySelector("textarea, input[type=text], input:not([type])");
  }
  return null;
}

async function generate(button) {
  const field = findField(button);
  if (!field) {
    Notification.error("Fehler", "Das Structured-Data-Feld wurde nicht gefunden.");
    return;
  }

  const ajaxUrl = TYPO3.settings.ajaxUrls["vitec_structureddata_generate"];
  if (!ajaxUrl) {
    Notification.error("Fehler", "AJAX-Route nicht registriert.");
    return;
  }

  button.disabled = true;
  try {
    const response = await new AjaxRequest(ajaxUrl)
      .withQueryArguments({ uid: button.dataset.uid })
      .get();
    const data = await response.resolve();

    if (data.success) {
      field.value = data.jsonLd;
      field.dispatchEvent(new Event("change", { bubbles: true }));
      Notification.success(
        "Structured Data",
        "JSON-LD wurde generiert und in das Feld geschrieben."
      );
    } else {
      Notification.warning("Hinweis", data.message || "Generierung nicht möglich.");
    }
  } catch (error) {
    Notification.error("Fehler", "Die Generierung ist fehlgeschlagen.");
  } finally {
    button.disabled = false;
  }
}

function init() {
  // Guard against binding more than once (the module instruction may be
  // emitted per field instance, but the module itself is a singleton).
  if (document.body.dataset.vitecSdBound === "1") {
    return;
  }
  document.body.dataset.vitecSdBound = "1";

  document.addEventListener("click", (event) => {
    const button = event.target.closest(SELECTOR);
    if (button === null) {
      return;
    }
    event.preventDefault();
    generate(button);
  });
}

DocumentService.ready().then(init);