"use strict";

const purgeGvlReferenceDataButton = document.getElementById(
  "purge-gvl-reference-data-button"
);
const gvlReferenceMaintenanceStatus = document.getElementById(
  "gvl-reference-maintenance-status"
);

document.addEventListener("DOMContentLoaded", () => {
  purgeGvlReferenceDataButton?.addEventListener("click", async () => {
    await purgeGvlReferenceData();
  });
});

async function purgeGvlReferenceData() {
  if (!confirm(buildGvlReferenceDataPurgeConfirmationText())) {
    renderGvlReferenceMaintenanceStatus("Abgebrochen.");
    return;
  }

  purgeGvlReferenceDataButton.disabled = true;
  renderGvlReferenceMaintenanceStatus("GVL-Referenzdaten werden bereinigt...");

  try {
    const result = await browser.runtime.sendMessage({
      type: "purge_gvl_reference_data"
    });

    if (!result?.success) {
      throw new Error(result?.error ?? "purge_gvl_reference_data_failed");
    }

    renderGvlReferenceMaintenanceStatus(
      buildGvlReferenceDataPurgeSuccessMessage(result)
    );
  } catch (error) {
    renderGvlReferenceMaintenanceStatus(
      "GVL-Referenzdaten konnten nicht bereinigt werden."
    );
    console.warn("VG-Observe GVL reference data purge failed", error);
  } finally {
    purgeGvlReferenceDataButton.disabled = false;
  }
}

function buildGvlReferenceDataPurgeConfirmationText() {
  return [
    "GVL-Referenzdaten bereinigen?",
    "",
    "Betroffen: GVL-Referenzdaten der Browser-DB.",
    "Nicht betroffen: Consent-Daten, Request-Beobachtungen, Analyse-Daten.",
    "",
    "Diese Aktion entfernt lokale GVL-Referenzdaten aus der Browser-Datenbank."
  ].join("\n");
}

function buildGvlReferenceDataPurgeSuccessMessage(result) {
  const clearedCount = Object.values(result.clearedStores ?? {}).reduce(
    (total, count) => total + Number(count ?? 0),
    0
  );

  return `GVL-Referenzdaten bereinigt: ${clearedCount} Records entfernt.`;
}

function renderGvlReferenceMaintenanceStatus(message) {
  gvlReferenceMaintenanceStatus.textContent = message;
}