/* ─── Custom cursor ───────────────────────────────────────────────────── */
(function () {
  const ring = document.getElementById('cursor');
  const dot  = document.getElementById('cursor-dot');
  if (!ring || !dot) return;
  let mx = 0, my = 0, rx = 0, ry = 0;
  document.addEventListener('mousemove', e => { mx = e.clientX; my = e.clientY; });
  document.addEventListener('mouseenter', () => { ring.style.opacity = '1'; dot.style.opacity = '1'; });
  document.addEventListener('mouseleave', () => { ring.style.opacity = '0'; dot.style.opacity = '0'; });
  (function raf() {
    rx += (mx - rx) * 0.12; ry += (my - ry) * 0.12;
    ring.style.left = rx + 'px'; ring.style.top = ry + 'px';
    dot.style.left  = mx + 'px'; dot.style.top  = my + 'px';
    requestAnimationFrame(raf);
  })();
  document.querySelectorAll('a,button,label,input,textarea,select').forEach(el => {
    el.addEventListener('mouseenter', () => ring.style.transform = 'translate(-50%,-50%) scale(1.6)');
    el.addEventListener('mouseleave', () => ring.style.transform = 'translate(-50%,-50%) scale(1)');
  });
})();

/* ─── Navbar scroll shadow ────────────────────────────────────────────── */
(function () {
  const nav = document.getElementById('navbar');
  if (!nav) return;
  const update = () => nav.classList.toggle('scrolled', window.scrollY > 30);
  window.addEventListener('scroll', update, { passive: true });
  update();
})();

/* ─── Mobile menu toggle ──────────────────────────────────────────────── */
(function () {
  const btn  = document.getElementById('menu-btn');
  const menu = document.getElementById('mobile-menu');
  if (!btn || !menu) return;
  btn.addEventListener('click', () => {
    const open = menu.classList.toggle('hidden');
    btn.setAttribute('aria-expanded', String(!open));
  });
  menu.querySelectorAll('a').forEach(a => a.addEventListener('click', () => menu.classList.add('hidden')));
})();

/* ─── Scroll-reveal (Intersection Observer) ───────────────────────────── */
(function () {
  const io = new IntersectionObserver((entries) => {
    entries.forEach(e => { if (e.isIntersecting) { e.target.classList.add('visible'); io.unobserve(e.target); } });
  }, { threshold: 0.12 });
  document.querySelectorAll('.reveal').forEach(el => io.observe(el));
})();

/* ─── Particle canvas (hero background) ──────────────────────────────── */
(function () {
  const canvas = document.getElementById('particle-canvas');
  if (!canvas) return;
  const ctx = canvas.getContext('2d');
  let W, H, particles = [], animId;

  function resize() {
    W = canvas.width  = canvas.offsetWidth;
    H = canvas.height = canvas.offsetHeight;
  }

  function makeParticle() {
    return {
      x: Math.random() * W, y: Math.random() * H,
      vx: (Math.random() - 0.5) * 0.3, vy: (Math.random() - 0.5) * 0.3,
      r: Math.random() * 1.5 + 0.5,
      a: Math.random() * 0.5 + 0.1
    };
  }

  function init() { particles = Array.from({ length: 90 }, makeParticle); }

  function draw() {
    ctx.clearRect(0, 0, W, H);
    const MAX_DIST = 120;
    for (let i = 0; i < particles.length; i++) {
      const p = particles[i];
      p.x += p.vx; p.y += p.vy;
      if (p.x < 0) p.x = W; if (p.x > W) p.x = 0;
      if (p.y < 0) p.y = H; if (p.y > H) p.y = 0;

      ctx.beginPath();
      ctx.arc(p.x, p.y, p.r, 0, Math.PI * 2);
      ctx.fillStyle = `rgba(56,189,248,${p.a})`;
      ctx.fill();

      for (let j = i + 1; j < particles.length; j++) {
        const q = particles[j];
        const dx = p.x - q.x, dy = p.y - q.y;
        const d = Math.sqrt(dx * dx + dy * dy);
        if (d < MAX_DIST) {
          ctx.beginPath();
          ctx.moveTo(p.x, p.y); ctx.lineTo(q.x, q.y);
          ctx.strokeStyle = `rgba(56,189,248,${(1 - d / MAX_DIST) * 0.15})`;
          ctx.lineWidth = 0.5;
          ctx.stroke();
        }
      }
    }
    animId = requestAnimationFrame(draw);
  }

  resize(); init(); draw();
  window.addEventListener('resize', () => { resize(); });

  // Pause when hidden
  document.addEventListener('visibilitychange', () => {
    if (document.hidden) { cancelAnimationFrame(animId); } else { draw(); }
  });
})();

/* ─── Typewriter ──────────────────────────────────────────────────────── */
(function () {
  const el = document.getElementById('typewriter');
  if (!el) return;
  const words = JSON.parse(el.dataset.words || '[]');
  if (!words.length) return;
  let wi = 0, ci = 0, deleting = false;

  function tick() {
    const word = words[wi];
    if (!deleting) {
      el.textContent = word.slice(0, ++ci);
      if (ci === word.length) { setTimeout(tick, 1800); deleting = true; return; }
      setTimeout(tick, 80);
    } else {
      el.textContent = word.slice(0, --ci);
      if (ci === 0) { deleting = false; wi = (wi + 1) % words.length; setTimeout(tick, 300); return; }
      setTimeout(tick, 40);
    }
  }
  tick();
})();

/* ─── Animated counters ───────────────────────────────────────────────── */
(function () {
  const io = new IntersectionObserver(entries => {
    entries.forEach(e => {
      if (!e.isIntersecting) return;
      const el = e.target;
      const target = parseInt(el.dataset.target || '0', 10);
      const duration = 1200;
      const start = performance.now();
      function step(now) {
        const t = Math.min((now - start) / duration, 1);
        const ease = 1 - Math.pow(1 - t, 3);
        el.textContent = el.dataset.prefix + Math.round(target * ease) + (el.dataset.suffix || '');
        if (t < 1) requestAnimationFrame(step);
      }
      requestAnimationFrame(step);
      io.unobserve(el);
    });
  }, { threshold: 0.5 });
  document.querySelectorAll('.counter').forEach(el => io.observe(el));
})();

/* ─── Expertise bars (animate on scroll) ─────────────────────────────── */
(function () {
  const io = new IntersectionObserver(entries => {
    entries.forEach(e => {
      if (!e.isIntersecting) return;
      const fill = e.target.querySelector('.bar-fill');
      if (fill) { fill.style.width = fill.dataset.w; }
      io.unobserve(e.target);
    });
  }, { threshold: 0.3 });
  document.querySelectorAll('.bar-track').forEach(el => io.observe(el));
})();

/* ─── Portfolio modal ─────────────────────────────────────────────────── */
(function () {
  const modal   = document.getElementById('portfolio-modal');
  const overlay = document.getElementById('modal-overlay');
  if (!modal) return;

  let images = [], idx = 0;

  const imgEl   = document.getElementById('modal-img');
  const titleEl = document.getElementById('modal-title');
  const bodyEl  = document.getElementById('modal-body');
  const prevBtn = document.getElementById('modal-prev');
  const nextBtn = document.getElementById('modal-next');
  const closeBtn = document.getElementById('modal-close');

  function showModal(card) {
    images = JSON.parse(card.dataset.gallery || '[]');
    idx    = 0;
    if (titleEl) titleEl.textContent = card.dataset.title || '';
    if (bodyEl)  bodyEl.innerHTML    = card.dataset.summary || '';
    updateImg();
    modal.classList.remove('hidden');
    modal.style.opacity = '0';
    requestAnimationFrame(() => { modal.style.opacity = '1'; });
    document.body.style.overflow = 'hidden';
  }

  function hideModal() {
    modal.style.opacity = '0';
    setTimeout(() => { modal.classList.add('hidden'); document.body.style.overflow = ''; }, 250);
  }

  function updateImg() {
    if (!imgEl) return;
    imgEl.src = images[idx] || '';
    if (prevBtn) prevBtn.disabled = idx === 0;
    if (nextBtn) nextBtn.disabled = idx === images.length - 1;
  }

  document.querySelectorAll('[data-portfolio-card]').forEach(card => {
    card.addEventListener('click', () => showModal(card));
    card.addEventListener('keydown', e => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); showModal(card); } });
  });

  if (closeBtn) closeBtn.addEventListener('click', hideModal);
  if (overlay)  overlay.addEventListener('click', hideModal);
  if (prevBtn)  prevBtn.addEventListener('click', () => { if (idx > 0) { idx--; updateImg(); } });
  if (nextBtn)  nextBtn.addEventListener('click', () => { if (idx < images.length - 1) { idx++; updateImg(); } });

  document.addEventListener('keydown', e => {
    if (modal.classList.contains('hidden')) return;
    if (e.key === 'Escape') hideModal();
    if (e.key === 'ArrowLeft')  { if (idx > 0) { idx--; updateImg(); } }
    if (e.key === 'ArrowRight') { if (idx < images.length - 1) { idx++; updateImg(); } }
  });
})();

/* ─── Contact form (AJAX) ─────────────────────────────────────────────── */
(function () {
  const form = document.getElementById('contact-form');
  if (!form) return;
  const status = document.getElementById('contact-status');

  form.addEventListener('submit', async e => {
    e.preventDefault();
    const data = Object.fromEntries(new FormData(form));
    const btn  = form.querySelector('[type="submit"]');
    btn.disabled = true;
    try {
      const res = await fetch('/contact', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data)
      });
      if (res.ok) {
        if (status) { status.textContent = form.dataset.successMsg || 'Sent!'; status.className = 'mt-3 text-sm text-emerald-400'; }
        form.reset();
      } else {
        if (status) { status.textContent = form.dataset.errorMsg || 'Something went wrong.'; status.className = 'mt-3 text-sm text-red-400'; }
      }
    } catch {
      if (status) { status.textContent = form.dataset.errorMsg || 'Network error.'; status.className = 'mt-3 text-sm text-red-400'; }
    } finally {
      btn.disabled = false;
    }
  });
})();