/**
 * Modal-Management für View und Edit Modals.
 */

var _lastFocusedElement = null;

function _getFocusableElements(container) {
  var selectors = 'button:not([disabled]), input:not([disabled]), [tabindex]:not([tabindex="-1"])';
  return Array.from(container.querySelectorAll(selectors)).filter(function(el) {
    return !el.closest('.hidden');
  });
}

function _trapFocus(e, container) {
  if (e.key !== 'Tab') return;
  var focusable = _getFocusableElements(container);
  if (focusable.length === 0) return;
  var first = focusable[0];
  var last = focusable[focusable.length - 1];
  if (e.shiftKey) {
    if (document.activeElement === first) {
      e.preventDefault();
      last.focus();
    }
  } else {
    if (document.activeElement === last) {
      e.preventDefault();
      first.focus();
    }
  }
}

function _setAriaHidden(id, hidden) {
  var el = document.getElementById(id);
  if (el) {
    if (hidden) {
      el.setAttribute('aria-hidden', 'true');
    } else {
      el.removeAttribute('aria-hidden');
    }
  }
}

/**
 * Zeige View-Modal mit Titel und Inhalt
 * @param {string} title - Titel des Modals
 * @param {string} content - Inhalt als Text
 */
function showModal(title, content) {
  _lastFocusedElement = document.activeElement;
  document.getElementById('modal-title').textContent = title;
  document.getElementById('modal-content').textContent = content;
  var modal = document.getElementById('modal');
  modal.classList.add('active');
  _setAriaHidden('modal', false);
  var focusable = _getFocusableElements(modal);
  if (focusable.length > 0) {
    focusable[0].focus();
  }
  modal.addEventListener('keydown', function(e) { _trapFocus(e, modal); });
}

/**
 * Schließe View-Modal
 */
function closeModal() {
  var modal = document.getElementById('modal');
  modal.classList.remove('active');
  _setAriaHidden('modal', true);
  if (_lastFocusedElement && _lastFocusedElement.focus) {
    _lastFocusedElement.focus();
  }
}

/**
 * Schließe Edit-Modal
 */
function closeEditModal() {
  _lastFocusedElement = document.activeElement;
  var modal = document.getElementById('edit-modal');
  modal.classList.remove('active');
  _setAriaHidden('edit-modal', true);
  if (_lastFocusedElement && _lastFocusedElement.focus) {
    _lastFocusedElement.focus();
  }
}

/**
 * Prüfe ob View-Modal offen war (für Copy-After-View-Logic)
 * @returns {boolean}
 */
function wasViewModalOpen() {
  return window._wasViewModalOpen || false;
}

// exported functions are global (loaded as <script> tags)