/* ═══════════════════════════════════════════
   NutriVision — script.js
   ═══════════════════════════════════════════ */

/* ── Hamburger ── */
const hamburger  = document.getElementById('hamburger');
const mobileMenu = document.getElementById('mobileMenu');
if (hamburger) {
  hamburger.addEventListener('click', () => {
    hamburger.classList.toggle('open');
    mobileMenu.classList.toggle('open');
  });
}

/* ── Navbar scroll shadow ── */
window.addEventListener('scroll', () => {
  const nb = document.getElementById('navbar');
  if (nb) nb.style.boxShadow = window.scrollY > 10 ? '0 2px 24px rgba(0,0,0,.4)' : 'none';
});

/* ── Reveal on scroll ── */
const revealEls = document.querySelectorAll('.reveal');
if (revealEls.length) {
  const io = new IntersectionObserver(entries => {
    entries.forEach(e => { if (e.isIntersecting) { e.target.classList.add('in-view'); io.unobserve(e.target); } });
  }, { threshold: 0.12, rootMargin: '0px 0px -40px 0px' });
  revealEls.forEach(el => io.observe(el));
}

/* ── Counter animation ── */
function animateCounter(el, target, duration = 1200) {
  const start = performance.now();
  const update = (now) => {
    const progress = Math.min((now - start) / duration, 1);
    const ease = 1 - Math.pow(1 - progress, 3);
    el.textContent = Math.floor(ease * target);
    if (progress < 1) requestAnimationFrame(update);
    else el.textContent = target;
  };
  requestAnimationFrame(update);
}
document.querySelectorAll('.counter').forEach(el => {
  const io = new IntersectionObserver(entries => {
    entries.forEach(e => {
      if (e.isIntersecting) { animateCounter(el, +el.dataset.to); io.unobserve(el); }
    });
  }, { threshold: 0.5 });
  io.observe(el);
});

/* ════════════════════════════════
   ANALYZER PAGE
   ════════════════════════════════ */
const uploadZone      = document.getElementById('uploadZone');
const imgInput        = document.getElementById('imgInput');
const uploadPlaceholder = document.getElementById('uploadPlaceholder');
const uploadPreview   = document.getElementById('uploadPreview');
const previewImg      = document.getElementById('previewImg');
const removeImgBtn    = document.getElementById('removeImg');
const analyzerForm    = document.getElementById('analyzerForm');
const loadingOverlay  = document.getElementById('loadingOverlay');
const resultsPanel    = document.getElementById('resultsPanel');

if (uploadZone) {
  uploadZone.addEventListener('click', () => {
    if (uploadPreview.style.display === 'none' || !uploadPreview.style.display) imgInput.click();
  });
  uploadZone.addEventListener('dragover', e => { e.preventDefault(); uploadZone.classList.add('dragover'); });
  uploadZone.addEventListener('dragleave', () => uploadZone.classList.remove('dragover'));
  uploadZone.addEventListener('drop', e => {
    e.preventDefault(); uploadZone.classList.remove('dragover');
    if (e.dataTransfer.files[0]) handleFile(e.dataTransfer.files[0]);
  });
  imgInput.addEventListener('change', e => { if (e.target.files[0]) handleFile(e.target.files[0]); });
  removeImgBtn.addEventListener('click', e => {
    e.stopPropagation();
    imgInput.value = '';
    previewImg.src = '';
    uploadPreview.style.display = 'none';
    uploadPlaceholder.style.display = 'block';
  });
}

function handleFile(file) {
  const valid = ['image/png','image/jpeg','image/jpg','image/webp'];
  if (!valid.includes(file.type)) { showToast('⚠️ Please upload PNG, JPG, JPEG, or WebP', 'error'); return; }
  if (file.size > 16 * 1024 * 1024) { showToast('⚠️ File too large. Max 16MB.', 'error'); return; }
  const dt = new DataTransfer();
  dt.items.add(file);
  imgInput.files = dt.files;
  const reader = new FileReader();
  reader.onload = e => {
    previewImg.src = e.target.result;
    uploadPlaceholder.style.display = 'none';
    uploadPreview.style.display = 'block';
  };
  reader.readAsDataURL(file);
}

/* ── Form submit ── */
if (analyzerForm) {
  analyzerForm.addEventListener('submit', async e => {
    e.preventDefault();
    if (!imgInput.files || !imgInput.files[0]) {
      showToast('⚠️ Please upload a food image first', 'error'); return;
    }
    showLoading();
    const fd = new FormData(analyzerForm);
    try {
      stepProgress(1);
      const resp = await fetch('/analyze', { method: 'POST', body: fd });
      stepProgress(2);
      const data = await resp.json();
      stepProgress(3);
      if (!resp.ok) throw new Error(data.error || 'Analysis failed');
      stepProgress(4);
      await sleep(400);
      hideLoading();
      renderResults(data);
      resultsPanel.style.display = 'flex';
      setTimeout(() => resultsPanel.scrollIntoView({ behavior: 'smooth', block: 'start' }), 200);
    } catch (err) {
      hideLoading();
      showToast('❌ ' + err.message, 'error');
    }
  });
}

/* ── Loading helpers ── */
function showLoading() {
  loadingOverlay.classList.add('active');
  document.querySelectorAll('.lstep').forEach(s => s.classList.remove('active'));
}
function hideLoading() { loadingOverlay.classList.remove('active'); }
function stepProgress(n) {
  const el = document.getElementById('lstep' + n);
  if (el) el.classList.add('active');
}
function sleep(ms) { return new Promise(r => setTimeout(r, ms)); }

/* ── Render results ── */
function renderResults(d) {
  // Banner
  document.getElementById('r_food').textContent = d.food || 'Unknown Food';
  document.getElementById('r_confidence').textContent = '🎯 ' + (d.confidence || '—');
  document.getElementById('r_source').textContent = '🤖 ' + (d.detection_source || '—');

  // BMI
  if (d.bmi) {
    document.getElementById('r_bmi').textContent = d.bmi;
    document.getElementById('r_bmiCat').textContent = d.bmi_category || '—';
    const bmiCat = (d.bmi_category || '').toLowerCase();
    const bmiVal = document.getElementById('r_bmi');
    if (bmiCat.includes('obese'))         bmiVal.style.color = '#f47171';
    else if (bmiCat.includes('overweight')) bmiVal.style.color = '#f5c842';
    else if (bmiCat.includes('under'))    bmiVal.style.color = '#60a5fa';
    else                                  bmiVal.style.color = 'var(--primary)';
  }

  // Nutrition grid
  const nutr = d.nutrition || {};
  const nutriMap = [
    { key: 'calories',      label: 'Calories',      emoji: '🔥' },
    { key: 'protein',       label: 'Protein',        emoji: '💪' },
    { key: 'carbohydrates', label: 'Carbs',           emoji: '🌾' },
    { key: 'fat',           label: 'Fat',             emoji: '🥑' },
    { key: 'fiber',         label: 'Fiber',           emoji: '🌿' },
    { key: 'sugar',         label: 'Sugar',           emoji: '🍬' },
    { key: 'sodium',        label: 'Sodium',          emoji: '🧂' },
    { key: 'serving_size',  label: 'Serving',         emoji: '🥣' },
  ];
  const ngEl = document.getElementById('r_nutrition');
  ngEl.innerHTML = '';
  nutriMap.forEach(item => {
    const val = nutr[item.key];
    if (!val) return;
    const div = document.createElement('div');
    div.className = 'nutri-item';
    div.innerHTML = `<div class="nutri-val">${item.emoji} ${val}</div><div class="nutri-label">${item.label}</div>`;
    ngEl.appendChild(div);
  });

  // Benefits
  const bList = document.getElementById('r_benefits');
  bList.innerHTML = '';
  (d.health_benefits || []).forEach(b => {
    const li = document.createElement('li');
    li.textContent = b;
    bList.appendChild(li);
  });

  // Portion
  document.getElementById('r_portion').textContent = d.portion_advice || '1 standard serving';

  // Health context
  const ctx = document.getElementById('contextCard');
  if (d.health_context) {
    ctx.style.display = 'block';
    document.getElementById('r_context').textContent = d.health_context;
  } else { ctx.style.display = 'none'; }

  // Alternatives
  const altCard = document.getElementById('altCard');
  const altList = document.getElementById('r_alternatives');
  altList.innerHTML = '';
  if (d.alternatives && d.alternatives.length) {
    altCard.style.display = 'block';
    d.alternatives.forEach(alt => {
      const div = document.createElement('div');
      div.className = 'alt-item';
      let urlsHtml = '';
      if (alt.urls && alt.urls.length) {
        const links = alt.urls.map(u =>
          `<a href="${u.url}" target="_blank" rel="noopener" class="buy-link">${u.emoji || ''} ${u.platform}</a>`
        ).join('');
        urlsHtml = `<div class="alt-buy"><span class="buy-label">🛒 Buy from:</span>${links}</div>`;
      }
      div.innerHTML = `
        <div class="alt-name">✓ ${alt.name}</div>
        <div class="alt-reason">${alt.reason}</div>
        ${urlsHtml}
      `;
      altList.appendChild(div);
    });
  } else { altCard.style.display = 'none'; }
}

/* ── Reset analyzer ── */
function resetAnalyzer() {
  if (imgInput) { imgInput.value = ''; }
  if (previewImg) { previewImg.src = ''; }
  if (uploadPreview) { uploadPreview.style.display = 'none'; }
  if (uploadPlaceholder) { uploadPlaceholder.style.display = 'block'; }
  if (resultsPanel) { resultsPanel.style.display = 'none'; }
  window.scrollTo({ top: 0, behavior: 'smooth' });
}

/* ── Toast notifications ── */
function showToast(msg, type = 'info') {
  const t = document.createElement('div');
  t.style.cssText = `
    position:fixed;bottom:1.5rem;right:1.5rem;z-index:99999;
    padding:.85rem 1.4rem;border-radius:12px;font-size:.9rem;font-weight:600;
    background:${type==='error'?'#f47171':'var(--primary)'};
    color:${type==='error'?'#fff':'#080d14'};
    box-shadow:0 8px 24px rgba(0,0,0,.4);
    animation:slideUp .3s ease both;
    max-width:320px;line-height:1.4;
  `;
  t.textContent = msg;
  document.body.appendChild(t);
  setTimeout(() => { t.style.opacity='0'; t.style.transition='.3s'; setTimeout(()=>t.remove(),300); }, 3500);
}

console.log('🥗 NutriVision loaded ✅');