import { renderHeader, renderFooter, api, esc, formatDate, fromIso, toIso, formatTime } from './common.js';

renderHeader('home', { overlay: true });
renderFooter();

const reduceMotion = matchMedia('(prefers-reduced-motion: reduce)');

// ---------- Scrollen: Flagge zoomt heran ----------
// Eine einzige rAF-Schleife, die nur läuft, wenn gescrollt wurde.
const stage = document.getElementById('hero-stage');
const hero = stage.parentElement;
let ticking = false;

function frame() {
  ticking = false;
  if (reduceMotion.matches) {
    stage.style.setProperty('--p', 0);
    return;
  }
  const range = Math.max(1, hero.offsetHeight - innerHeight);
  const p = Math.min(1, Math.max(0, scrollY / range));
  stage.style.setProperty('--p', p.toFixed(4));
}

function requestFrame() {
  if (!ticking) {
    ticking = true;
    requestAnimationFrame(frame);
  }
}
addEventListener('scroll', requestFrame, { passive: true });
addEventListener('resize', requestFrame);
reduceMotion.addEventListener('change', requestFrame);
frame();

// ---------- Abschnitte gleiten beim ersten Sichtbarwerden herein ----------
// Nur was beim Laden unterhalb des Bildschirms liegt, wird erst versteckt – sichtbarer Inhalt bleibt sichtbar.
if (!reduceMotion.matches && 'IntersectionObserver' in window) {
  const observer = new IntersectionObserver((entries) => {
    for (const entry of entries) {
      if (!entry.isIntersecting) continue;
      entry.target.classList.add('reveal-in');
      entry.target.classList.remove('reveal-pending');
      observer.unobserve(entry.target);
    }
  }, { rootMargin: '0px 0px -10% 0px' });
  for (const el of document.querySelectorAll('.reveal')) {
    if (el.getBoundingClientRect().top > innerHeight) {
      el.classList.add('reveal-pending');
      observer.observe(el);
    }
  }
}

// ---------- Nächster Einsatz + nächste Termine ----------
function daysUntil(iso) {
  return Math.round((fromIso(iso) - fromIso(toIso(new Date()))) / 86400000);
}

function renderNext(events) {
  const next = events.find((e) => e.isGame) || events[0];
  const title = document.getElementById('next-title');
  const when = document.getElementById('next-when');
  const box = document.getElementById('next-countdown');
  if (!next) {
    title.textContent = 'Noch nichts geplant';
    when.textContent = 'Der nächste Spieltag steht noch nicht im Kalender.';
    return;
  }
  title.textContent = next.title;
  when.textContent = [formatDate(next.date, true), formatTime(next)].filter(Boolean).join(' · ');
  const days = daysUntil(next.date);
  const label = next.attendeeCount === 1 ? '1 Zusage' : `${next.attendeeCount} Zusagen`;
  box.innerHTML = days <= 0
    ? `<span class="big">Heute</span><span class="unit">${label}</span>`
    : `<span class="big">${days}</span>
       <span class="unit">${days === 1 ? 'Tag' : 'Tage'}<small>bis zum Spiel · ${label}</small></span>`;
  box.hidden = false;
}

const box = document.getElementById('upcoming');
try {
  const events = await api('GET', '/upcoming');
  renderNext(events);
  box.innerHTML = events.length
    ? `<ul class="list">${events.map((e) => `
        <li>
          <span class="name"><strong>${esc(e.title)}</strong>
            <span class="meta">· ${formatDate(e.date, true)}${e.time ? `, ${e.time} Uhr` : ''}</span></span>
          ${e.isGame ? '' : '<span class="badge nogame">Kein Spiel</span>'}
          <span class="badge">${e.attendeeCount} zugesagt</span>
        </li>`).join('')}</ul>`
    : '<p class="muted">Noch keine Termine eingetragen.</p>';
} catch {
  box.innerHTML = '<p class="muted">Termine konnten nicht geladen werden.</p>';
  document.getElementById('next-title').textContent = 'Termine nicht erreichbar';
}

// ---------- Pile of Shame: wer dieses Jahr noch nicht spielen war ----------
const shame = document.getElementById('shame');
try {
  const { year, entries } = await api('GET', '/stats');
  const names = entries.filter((s) => s.total === 0).map((s) => s.name).sort((a, b) => a.localeCompare(b, 'de'));
  shame.innerHTML = names.length
    ? `<p class="muted">Waren ${year} noch kein einziges Mal spielen:</p>
       <div class="chips">${names.map((n) => `<span class="chip">${esc(n)}</span>`).join('')}</div>`
    : `<p class="muted">Leer, alle waren ${year} schon spielen.</p>`;
} catch {
  shame.innerHTML = '<p class="muted">Konnte nicht geladen werden.</p>';
}

// ---------- Patches (neueste zuerst) ----------
try {
  const patches = await api('GET', '/patches');
  if (patches.length) {
    document.getElementById('patch-rail').innerHTML = patches.slice(0, 12).map((p) => `
      <a href="/patches#${p.id}">
        <figure>
          <div class="patch-img"><img src="/patch-img/${encodeURIComponent(p.image)}" alt="" loading="lazy"></div>
          <figcaption>${esc(p.name)}${p.status === 'geplant' ? ' <span class="badge nogame">In Planung</span>' : ''}</figcaption>
        </figure>
      </a>`).join('');
    document.getElementById('patch-section').hidden = false;
  }
} catch { /* Abschnitt bleibt ausgeblendet */ }