function loadMaintenanceCSS() {
  const maintenanceCSS = document.createElement("link");
  maintenanceCSS.rel = "stylesheet";
  maintenanceCSS.href = chrome.runtime.getURL("global/maintenance.css");
  document.head.appendChild(maintenanceCSS);
}

function checkMaintenancePage() {
  const maintenanceContent = document.querySelector(".login_content");
  const bodyText = document.body ? document.body.textContent : "";

  const hasSpecificMessage = bodyText.includes("A KRÉTA rendszer jelenleg frissítés alatt van");

  const hasGeneralMaintenance =
    maintenanceContent &&
    (maintenanceContent.textContent.includes("frissítés alatt") ||
      maintenanceContent.textContent.includes("under maintenance"));

  if (hasSpecificMessage || hasGeneralMaintenance) {
    const body = document.body;
    const mainLogo = chrome.runtime.getURL("images/firka_logo_128.png");
    const cactusImage = chrome.runtime.getURL("images/cactus.png");

    const removeLoadingElements = () => {
      const loadingScreen = document.querySelector(".loading-screen");
      if (loadingScreen) loadingScreen.remove();

      const kretaProgressBar = document.querySelector("#KretaProgressBar");
      if (kretaProgressBar) kretaProgressBar.remove();

      const modalBackground = document.querySelector(".modalBckgroundMain");
      if (modalBackground) modalBackground.remove();

      const overlays = document.querySelectorAll(
        ".modalBckgroundMain, .loading-screen, #KretaProgressBar",
      );
      overlays.forEach((overlay) => overlay.remove());
    };

    removeLoadingElements();
    setTimeout(removeLoadingElements, 100);

    const existingStyles = document.querySelectorAll(
      'link[rel="stylesheet"], style',
    );
    existingStyles.forEach((style) => style.remove());

    helper.clearElement(body);
    body.classList.add("maintenance-mode");
    body.classList.add("theme-enabled");
    body.classList.add("loaded");

    loadMaintenanceCSS();

    const container = document.createElement("div");
    container.className = "maintenance-container";

    const logo = document.createElement("img");
    logo.src = mainLogo;
    logo.alt = "Firka Logo";
    logo.className = "maintenance-logo";

    const title = document.createElement("h1");
    title.className = "maintenance-title";
    title.textContent = window.LanguageManager
      ? window.LanguageManager.t("maintenance.title")
      : "Karbantartás";

    const messageDiv = document.createElement("div");
    messageDiv.className = "maintenance-message";

    const paragraph1 = document.createElement("p");
    paragraph1.textContent = window.LanguageManager
      ? window.LanguageManager.t("maintenance.message1")
      : "A KRÉTA rendszer jelenleg frissítés alatt van, hamarosan újra elérhetővé válik.";

    const paragraph2 = document.createElement("p");
    paragraph2.textContent = window.LanguageManager
      ? window.LanguageManager.t("maintenance.message2")
      : "Köszönjük türelmüket és megértésüket!";

    const footer = document.createElement("div");
    footer.className = "maintenance-footer";
    footer.textContent = window.LanguageManager
      ? window.LanguageManager.t("maintenance.team")
      : "KRÉTA Csapat";

    const cactus = document.createElement("img");
    cactus.src = cactusImage;
    cactus.alt = "Cactus";
    cactus.className = "maintenance-cactus";

    messageDiv.appendChild(paragraph1);
    messageDiv.appendChild(paragraph2);

    container.appendChild(logo);
    container.appendChild(title);
    container.appendChild(messageDiv);
    container.appendChild(footer);

    body.appendChild(container);
    body.appendChild(cactus);
  }
}

document.addEventListener("DOMContentLoaded", checkMaintenancePage);