// App-Flow: beim Laden sofort eine zufaellige Szene holen (kein Start-Screen, keine
// Auswahl). Alle 3 Fuesse finden -> Gewinn-Overlay -> "Weiter" laedt die naechste.

import { Scene } from './scene.js';
import { Legend } from './legend.js';

const stage = document.getElementById('stage');
const world = document.getElementById('world');
const sceneImg = document.getElementById('scene-img');
const loading = document.getElementById('loading');
const winOverlay = document.getElementById('win-overlay');
const toast = document.getElementById('toast');

const scene = new Scene(stage, world, sceneImg);
const legend = new Legend(
  document.getElementById('legend-items'),
  document.getElementById('legend-counter')
);

let current = null; // aktuelles Szenen-Payload
let busy = false;

function showLoading(on) {
  loading.classList.toggle('hidden', !on);
}

function showToast(message) {
  toast.textContent = message;
  toast.classList.add('show');
  clearTimeout(showToast._t);
  showToast._t = setTimeout(() => toast.classList.remove('show'), 900);
}

async function loadScene() {
  showLoading(true);
  winOverlay.classList.add('hidden');
  try {
    const res = await fetch('/api/scene');
    if (!res.ok) throw new Error('Szene konnte nicht geladen werden.');
    current = await res.json();
    await scene.render(current);
    scene.resetView();
    legend.render(current.targets);
    document.getElementById('category-name').textContent = current.category || '';
  } catch (err) {
    console.error(err);
    showToast('Ups — Szene konnte nicht geladen werden.');
  } finally {
    showLoading(false);
  }
}

async function handleTap({ x, y }) {
  if (busy || !current) return;
  busy = true;
  try {
    const res = await fetch(`/api/scene/${current.sceneId}/guess`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ x, y }),
    });
    const data = await res.json();
    if (data.hit) {
      const isNew = legend.markFound(data.hit);
      scene.pingAt(x, y, true);
      if (isNew && legend.allFound()) {
        setTimeout(() => winOverlay.classList.remove('hidden'), 400);
      }
    } else {
      scene.pingAt(x, y, false);
    }
  } catch (err) {
    console.error(err);
  } finally {
    busy = false;
  }
}

scene.onTap(handleTap);

// Steuerung
document.getElementById('zoom-in').addEventListener('click', () => scene.zoomIn());
document.getElementById('zoom-out').addEventListener('click', () => scene.zoomOut());
document.getElementById('reset-view').addEventListener('click', () => scene.resetView());
document.getElementById('next-scene').addEventListener('click', loadScene);

// Los geht's — sofort.
loadScene();