// ── SPA Router ──

const routes = {};
let currentPage = null;

function registerPage(name, { init, destroy }) {
  routes[name] = { init, destroy };
}

async function navigateTo(page, params = {}) {
  const app = document.getElementById('app');

  // Tooltip verstecken
  if (window.hideTooltip) window.hideTooltip();

  // Alte Page zerstören
  if (currentPage && routes[currentPage] && routes[currentPage].destroy) {
    routes[currentPage].destroy();
  }

  // Template klonen und einfügen
  const tpl = document.getElementById(`tpl-${page}`);
  if (!tpl) {
    app.innerHTML = `<div class="placeholder-page"><h2>404</h2><p>Seite "${page}" nicht gefunden.</p></div>`;
    currentPage = null;
    return;
  }

  app.innerHTML = '';
  app.appendChild(tpl.content.cloneNode(true));
  currentPage = page;

  // Nav-Links aktualisieren
  document.querySelectorAll('.nav-link').forEach(l => {
    l.classList.toggle('active', l.dataset.page === page);
  });

  // URL Hash setzen
  const hash = params.id ? `${page}/${params.id}` : page;
  history.replaceState(null, '', `#${hash}`);

  // Page initialisieren
  if (routes[page] && routes[page].init) {
    await routes[page].init(params);
  }

  // Back-Buttons verdrahten
  document.querySelectorAll('.back-btn[data-page]').forEach(btn => {
    btn.addEventListener('click', () => navigateTo(btn.dataset.page));
  });
}

function parseHash() {
  const hash = location.hash.slice(1) || 'dashboard';
  const parts = hash.split('/');
  return { page: parts[0], id: parts[1] || null };
}