// Bratonien Glitter Hover Effekt – für .door, .openfield und .fluegel
document.querySelectorAll(".door, .openfield, .fluegel").forEach(elem => {
  let canvas, ctx, particles = [], anim, hovering = false;
  let cursorX = 0, cursorY = 0;

  const day = elem.dataset.day;
  const partners = new Set();

  // === PARTNERLOGIK ===
  if (elem.classList.contains("door")) {
    const of = document.querySelector(`.openfield[data-day="${day}"]`);
    if (of) partners.add(of);
  }

  else if (elem.classList.contains("openfield")) {
    const door = document.querySelector(`.door[data-day="${day}"]`);
    if (door) partners.add(door);

    const left  = document.querySelector(`.fluegel.left[data-day="${day}"]`);
    const right = document.querySelector(`.fluegel.right[data-day="${day}"]`);
    if (left)  partners.add(left);
    if (right) partners.add(right);
  }

  else if (elem.classList.contains("fluegel")) {
    const opposite = document.querySelector(`.fluegel.${elem.classList.contains("left") ? "right" : "left"}[data-day="${day}"]`);
    if (opposite) partners.add(opposite);

    const of = document.querySelector(`.openfield[data-day="${day}"]`);
    if (of) partners.add(of);
  }

  // === CANVAS SETUP ===
  function setupCanvas() {
    if (canvas) return;
    canvas = document.createElement("canvas");
    canvas.width = elem.offsetWidth * 1.4;
    canvas.height = elem.offsetHeight * 1.4;
    canvas.style.position = "absolute";
    canvas.style.top = "-20%";
    canvas.style.left = "-20%";
    canvas.style.pointerEvents = "none";
    canvas.style.zIndex = "10";
    elem.appendChild(canvas);
    ctx = canvas.getContext("2d");
  }

  // === MAUSPOSITION FÜR EFFEKT ===
  elem.addEventListener("mousemove", e => {
    const rect = elem.getBoundingClientRect();
    cursorX = (e.clientX - rect.left) * 1.4 - (elem.offsetWidth * 0.2);
    cursorY = (e.clientY - rect.top) * 1.4 - (elem.offsetHeight * 0.2);
  });

  // === PARTIKEL ERZEUGEN ===
  function addParticles() {
    const cx = cursorX || canvas.width / 2;
    const cy = cursorY || canvas.height / 2;
    for (let i = 0; i < 4; i++) {
      const angle = Math.random() * Math.PI * 2;
      const speed = Math.random() * 1.5 + 0.3;
      particles.push({
        x: cx,
        y: cy,
        r: Math.random() * 1.3 + 0.2,
        alpha: Math.random() * 0.7 + 0.3,
        vx: Math.cos(angle) * speed,
        vy: Math.sin(angle) * speed,
        life: Math.random() * 120 + 60,
        decay: Math.random() * 0.015 + 0.008
      });
    }
  }

  // === ZEICHNEN ===
  function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    if (hovering) addParticles();

    particles.forEach(p => {
      ctx.beginPath();
      const grad = ctx.createRadialGradient(p.x, p.y, 0, p.x, p.y, p.r * 3);
      grad.addColorStop(0, `rgba(200, 170, 73, ${p.alpha})`);
      grad.addColorStop(0.3, `rgba(255, 240, 200, ${p.alpha * 0.8})`);
      grad.addColorStop(1, "transparent");
      ctx.fillStyle = grad;
      ctx.arc(p.x, p.y, p.r * 3, 0, Math.PI * 2);
      ctx.fill();

      p.x += p.vx;
      p.y += p.vy + 0.05;
      p.vx *= 0.98;
      p.vy *= 0.98;
      p.alpha -= p.decay;
      p.life--;
    });

    particles = particles.filter(p => p.life > 0 && p.alpha > 0);
    anim = requestAnimationFrame(draw);
  }

  // === HOVER START ===
  elem.addEventListener("mouseenter", () => {
    setupCanvas();
    hovering = true;
    cancelAnimationFrame(anim);
    draw();

    partners.forEach(p => p.classList.add("hover-proxy"));
  });

  // === HOVER ENDE ===
  elem.addEventListener("mouseleave", () => {
    hovering = false;
    setTimeout(() => {
      if (!hovering) {
        cancelAnimationFrame(anim);
        particles = [];
        ctx.clearRect(0, 0, canvas.width, canvas.height);
      }
    }, 300);

    partners.forEach(p => p.classList.remove("hover-proxy"));
  });
});