(function () {
  const STORAGE_KEY = 'asch-cookie-consent';

  function getStoredChoice() {
    try {
      return window.localStorage.getItem(STORAGE_KEY);
    } catch (error) {
      return null;
    }
  }

  function setStoredChoice(choice) {
    try {
      window.localStorage.setItem(STORAGE_KEY, choice);
    } catch (error) {
      // Ignore storage failures in private mode or restricted environments.
    }

    document.documentElement.dataset.cookieConsent = choice;
    document.documentElement.dataset.optionalCookies = choice === 'accepted' ? 'allowed' : 'blocked';
  }

  function buildBanner() {
    if (document.querySelector('[data-cookie-banner]')) {
      return document.querySelector('[data-cookie-banner]');
    }

    const banner = document.createElement('aside');
    banner.className = 'cookie-banner';
    banner.dataset.cookieBanner = 'true';
    banner.setAttribute('role', 'dialog');
    banner.setAttribute('aria-live', 'polite');
    banner.innerHTML = `
      <div class="cookie-banner__eyebrow">Cookie preferences</div>
      <h2 class="cookie-banner__title">Optional cookies stay blocked until you choose otherwise.</h2>
      <p class="cookie-banner__copy">
        We use essential cookies only for the site to function. Any optional cookies remain off unless you allow them.
      </p>
      <div class="cookie-banner__actions">
        <button type="button" class="btn btn-secondary cookie-banner__btn cookie-banner__btn--ghost" data-cookie-choice="reject">Keep essential only</button>
        <button type="button" class="btn btn-secondary cookie-banner__btn cookie-banner__btn--muted" data-cookie-choice="details">Read policy</button>
        <button type="button" class="btn btn-primary cookie-banner__btn" data-cookie-choice="accept">Allow optional</button>
      </div>
      <div class="cookie-banner__meta">You can change this later from the Cookie Policy page or the footer settings link.</div>
    `;

    document.body.appendChild(banner);
    return banner;
  }

  function openBanner() {
    const banner = buildBanner();
    banner.classList.add('is-visible');
    banner.setAttribute('aria-hidden', 'false');
  }

  function closeBanner() {
    const banner = document.querySelector('[data-cookie-banner]');
    if (!banner) {
      return;
    }
    banner.classList.remove('is-visible');
    banner.setAttribute('aria-hidden', 'true');
  }

  function applyChoice(choice) {
    setStoredChoice(choice === 'accept' ? 'accepted' : 'rejected');
    closeBanner();
  }

  function init() {
    const storedChoice = getStoredChoice();
    if (storedChoice === 'accepted' || storedChoice === 'rejected') {
      setStoredChoice(storedChoice);
    } else {
      document.documentElement.dataset.cookieConsent = 'pending';
      document.documentElement.dataset.optionalCookies = 'blocked';
      requestAnimationFrame(() => {
        openBanner();
      });
    }

    document.addEventListener('click', (event) => {
      const settingsLink = event.target.closest('[data-cookie-settings]');
      if (settingsLink) {
        event.preventDefault();
        openBanner();
        return;
      }

      const choiceButton = event.target.closest('[data-cookie-choice]');
      if (!choiceButton) {
        return;
      }

      const choice = choiceButton.dataset.cookieChoice;
      if (choice === 'details') {
        event.preventDefault();
        window.location.href = 'cookie-policy.html#cookie-preferences';
        return;
      }

      event.preventDefault();
      applyChoice(choice);
    });

    window.aschCookieConsent = {
      get choice() {
        return getStoredChoice();
      },
      open: openBanner,
      accept: () => applyChoice('accept'),
      reject: () => applyChoice('reject')
    };
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init, { once: true });
  } else {
    init();
  }
})();