(() => {
  const reducedMotion = matchMedia('(prefers-reduced-motion: reduce)').matches;
  document.getElementById('year').textContent = new Date().getFullYear();

  document.getElementById('ticket-number').textContent = `TKT-${String(Math.floor(1000 + Math.random() * 9000))}`;
  document.getElementById('started-at').value = Math.floor(Date.now() / 1000);

  const reveals = document.querySelectorAll('.reveal');
  if (reducedMotion || !('IntersectionObserver' in window)) {
    reveals.forEach((item) => item.classList.add('visible'));
  } else {
    const observer = new IntersectionObserver((entries) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          entry.target.classList.add('visible');
          observer.unobserve(entry.target);
        }
      });
    }, { threshold: 0.12 });
    reveals.forEach((item) => observer.observe(item));
  }

  const form = document.getElementById('contact-form');
  const status = document.getElementById('form-status');
  form.addEventListener('submit', async (event) => {
    event.preventDefault();
    if (!form.reportValidity()) return;
    form.classList.remove('error', 'success');
    form.classList.add('sending');
    status.textContent = 'Routing your ticket…';
    form.querySelector('.button-label').textContent = 'Sending';
    try {
      const response = await fetch(form.action, { method: 'POST', body: new FormData(form), headers: { Accept: 'application/json' } });
      const result = await response.json();
      if (!response.ok || !result.ok) throw new Error(result.message || 'Message could not be sent.');
      form.classList.add('success');
      status.textContent = result.message;
      form.reset();
      document.getElementById('started-at').value = Math.floor(Date.now() / 1000);
      form.querySelector('.button-label').textContent = 'Ticket received ✓';
    } catch (error) {
      form.classList.add('error');
      status.textContent = error.message;
      form.querySelector('.button-label').textContent = 'Try again';
    } finally {
      form.classList.remove('sending');
    }
  });

  if (reducedMotion) return;
  const canvas = document.getElementById('particle-field');
  const context = canvas.getContext('2d');
  const pointer = { x: -1000, y: -1000 };
  let particles = [];
  let width = 0;
  let height = 0;
  const resize = () => {
    const ratio = Math.min(devicePixelRatio || 1, 2);
    width = innerWidth;
    height = innerHeight;
    canvas.width = width * ratio;
    canvas.height = height * ratio;
    canvas.style.width = `${width}px`;
    canvas.style.height = `${height}px`;
    context.setTransform(ratio, 0, 0, ratio, 0, 0);
    particles = Array.from({ length: Math.min(55, Math.floor(width / 24)) }, () => ({
      x: Math.random() * width, y: Math.random() * height, vx: (Math.random() - .5) * .18, vy: (Math.random() - .5) * .18, r: Math.random() * 1.4 + .4
    }));
  };
  addEventListener('resize', resize, { passive: true });
  addEventListener('pointermove', (event) => { pointer.x = event.clientX; pointer.y = event.clientY; }, { passive: true });
  addEventListener('pointerleave', () => { pointer.x = pointer.y = -1000; });
  resize();
  const draw = () => {
    context.clearRect(0, 0, width, height);
    particles.forEach((particle, index) => {
      particle.x += particle.vx; particle.y += particle.vy;
      if (particle.x < 0 || particle.x > width) particle.vx *= -1;
      if (particle.y < 0 || particle.y > height) particle.vy *= -1;
      const pdx = pointer.x - particle.x, pdy = pointer.y - particle.y, pointerDistance = Math.hypot(pdx, pdy);
      if (pointerDistance < 130) { particle.x -= pdx * .0008; particle.y -= pdy * .0008; }
      context.beginPath(); context.arc(particle.x, particle.y, particle.r, 0, Math.PI * 2); context.fillStyle = '#6fc9ff55'; context.fill();
      for (let j = index + 1; j < particles.length; j++) {
        const other = particles[j], distance = Math.hypot(particle.x - other.x, particle.y - other.y);
        if (distance < 115) { context.beginPath(); context.moveTo(particle.x, particle.y); context.lineTo(other.x, other.y); context.strokeStyle = `rgba(70,185,255,${(1 - distance / 115) * .09})`; context.stroke(); }
      }
    });
    requestAnimationFrame(draw);
  };
  draw();
})();