// ── Admin Dashboard — The Roasted Bean ─────────────────────────────────────

let menuData = null;
let editingItemId = null;

document.addEventListener('DOMContentLoaded', () => checkAuth());

// ── Auth ────────────────────────────────────────────────────────────────────
async function checkAuth() {
  try {
    const res = await fetch('/api/auth');
    const data = await res.json();
    data.authenticated ? showDashboard() : showLogin();
  } catch { showLogin(); }
}

function showLogin() {
  document.getElementById('loginScreen').style.display = '';
  document.getElementById('dashboard').style.display = 'none';
  document.getElementById('loginForm').addEventListener('submit', handleLogin);
}

function showDashboard() {
  document.getElementById('loginScreen').style.display = 'none';
  document.getElementById('dashboard').style.display = '';
  setupDashboard();
}

async function handleLogin(e) {
  e.preventDefault();
  const pw = document.getElementById('password').value;
  const errEl = document.getElementById('loginError');
  try {
    const res = await fetch('/api/login', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ password: pw })
    });
    const data = await res.json();
    if (data.success) { errEl.textContent = ''; showDashboard(); }
    else { errEl.textContent = data.error || 'Invalid password'; }
  } catch { errEl.textContent = 'Connection error. Server running?'; }
}

// ── Dashboard Setup ─────────────────────────────────────────────────────────
async function setupDashboard() {
  await loadMenuData();
  setupNav();
  setupModal();
  setupForms();
  showSection('menu');

  document.getElementById('logoutBtn').addEventListener('click', async () => {
    await fetch('/api/logout', { method: 'POST' });
    location.reload();
  });
  document.getElementById('addItemBtn').addEventListener('click', () => openModal());
}

async function loadMenuData() {
  const res = await fetch('/api/menu');
  menuData = await res.json();
}

// ── Navigation ──────────────────────────────────────────────────────────────
function setupNav() {
  document.getElementById('topbarNav').addEventListener('click', (e) => {
    const btn = e.target.closest('.tb-nav-item');
    if (!btn) return;
    document.querySelectorAll('.tb-nav-item').forEach(b => b.classList.remove('active'));
    btn.classList.add('active');
    showSection(btn.dataset.section);
  });
}

function showSection(section) {
  document.querySelectorAll('.panel').forEach(p => p.style.display = 'none');

  switch (section) {
    case 'menu':
      document.getElementById('menuSection').style.display = '';
      renderTable();
      break;
    case 'categories':
      document.getElementById('categoriesSection').style.display = '';
      renderCategories();
      break;
    case 'info':
      document.getElementById('infoSection').style.display = '';
      renderInfo();
      break;
    case 'tables':
      document.getElementById('tablesSection').style.display = '';
      setupTablesSection();
      break;
    case 'settings':
      document.getElementById('settingsSection').style.display = '';
      break;
  }
}

// ── Table ───────────────────────────────────────────────────────────────────
function renderTable() {
  const tbody = document.getElementById('menuTableBody');
  const empty = document.getElementById('menuEmpty');
  const items = menuData?.items || [];

  if (items.length === 0) { tbody.innerHTML = ''; empty.style.display = ''; return; }
  empty.style.display = 'none';

  const cats = {};
  (menuData.categories || []).forEach(c => { cats[c.id] = c.name; });

  tbody.innerHTML = items.map(item => {
    const hasImg = item.image && item.image.startsWith('http');
    const thumbImg = hasImg
      ? `<img src="${esc(item.image)}" alt="" loading="lazy" onerror="this.style.display='none'">`
      : '';
    const thumbSvg = adminSvgIcon(item.category);

    return `
    <tr>
      <td>
        <div class="item-cell">
          <span class="item-thumb">${thumbSvg}${thumbImg}</span>
          <div>
            <div class="item-name">${esc(item.name)}</div>
            <div class="item-desc">${esc((item.description || '').slice(0, 50))}</div>
          </div>
        </div>
      </td>
      <td>${cats[item.category] || item.category}</td>
      <td>₹${item.price.toFixed(0)}</td>
      <td>
        <span class="badge ${item.available ? 'badge-available' : 'badge-soldout'}">
          ${item.available ? 'Available' : 'Sold out'}
        </span>
      </td>
      <td>
        <div class="actions">
          <button class="act edit" data-id="${item.id}" title="Edit">✎</button>
          <button class="act toggle" data-id="${item.id}" title="${item.available ? 'Mark sold out' : 'Mark available'}">${item.available ? '⊘' : '✓'}</button>
          <button class="act danger" data-id="${item.id}" title="Delete">✕</button>
        </div>
      </td>
    </tr>
  `}).join('');

  tbody.addEventListener('click', (e) => {
    const btn = e.target.closest('.act');
    if (!btn) return;
    const id = btn.dataset.id;
    const item = items.find(i => i.id === id);
    if (!item) return;
    if (btn.classList.contains('edit')) openModal(item);
    else if (btn.classList.contains('toggle')) toggleItem(item);
    else if (btn.classList.contains('danger')) deleteItem(id);
  });
}

// ── Modal ───────────────────────────────────────────────────────────────────
function setupModal() {
  const modal = document.getElementById('itemModal');
  document.getElementById('modalClose').addEventListener('click', closeModal);
  document.getElementById('modalCancel').addEventListener('click', closeModal);
  modal.addEventListener('click', (e) => { if (e.target === modal) closeModal(); });
  document.addEventListener('keydown', (e) => { if (e.key === 'Escape') closeModal(); });
  document.getElementById('itemForm').addEventListener('submit', saveItem);
}

function openModal(item = null) {
  editingItemId = item?.id || null;
  document.getElementById('modalTitle').textContent = item ? 'Edit item' : 'Add item';
  document.getElementById('modalSave').textContent = item ? 'Update' : 'Add';

  const select = document.getElementById('itemCategory');
  select.innerHTML = (menuData.categories || [])
    .filter(c => c.id !== 'all')
    .map(c => `<option value="${c.id}">${c.name}</option>`)
    .join('');

  document.getElementById('itemId').value = item?.id || '';
  document.getElementById('itemName').value = item?.name || '';
  document.getElementById('itemPrice').value = item?.price || '';
  document.getElementById('itemCategory').value = item?.category || '';
  document.getElementById('itemDescription').value = item?.description || '';
  document.getElementById('itemImage').value = (item?.image && item.image.startsWith('http')) ? item.image : '';
  document.getElementById('itemAvailable').checked = item ? item.available : true;
  document.getElementById('itemFeatured').checked = item ? item.featured : false;

  document.getElementById('itemModal').classList.add('open');
  setTimeout(() => document.getElementById('itemName').focus(), 150);
}

function closeModal() {
  document.getElementById('itemModal').classList.remove('open');
  editingItemId = null;
  document.getElementById('itemForm').reset();
}

async function saveItem(e) {
  e.preventDefault();
  const id = document.getElementById('itemId').value;

  const item = {
    name: document.getElementById('itemName').value.trim(),
    price: parseFloat(document.getElementById('itemPrice').value),
    category: document.getElementById('itemCategory').value,
    description: document.getElementById('itemDescription').value.trim(),
    image: document.getElementById('itemImage').value.trim() || null,
    available: document.getElementById('itemAvailable').checked,
    featured: document.getElementById('itemFeatured').checked
  };

  if (!item.name || isNaN(item.price) || !item.category) {
    return showToast('Fill in name, price, and category.', 'error');
  }

  try {
    const url = id ? `/api/menu/${id}` : '/api/menu';
    const method = id ? 'PUT' : 'POST';
    const res = await fetch(url, {
      method,
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(item)
    });
    if (!res.ok) throw new Error((await res.json()).error || 'Failed');
    await loadMenuData();
    renderTable();
    closeModal();
    showToast(id ? 'Item updated.' : 'Item added.', 'success');
  } catch (err) {
    showToast(err.message || 'Error saving', 'error');
  }
}

async function toggleItem(item) {
  try {
    const res = await fetch(`/api/menu/${item.id}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ available: !item.available })
    });
    if (!res.ok) throw new Error('Failed');
    await loadMenuData();
    renderTable();
    showToast(`Marked as ${!item.available ? 'available' : 'sold out'}.`, 'success');
  } catch { showToast('Error updating', 'error'); }
}

async function deleteItem(id) {
  if (!confirm('Delete this item? This cannot be undone.')) return;
  try {
    const res = await fetch(`/api/menu/${id}`, { method: 'DELETE' });
    if (!res.ok) throw new Error('Failed');
    await loadMenuData();
    renderTable();
    showToast('Item deleted.', 'success');
  } catch { showToast('Error deleting', 'error'); }
}

// ── Categories ──────────────────────────────────────────────────────────────
function renderCategories() {
  const container = document.getElementById('categoriesEditor');
  const cats = menuData?.categories || [];
  container.innerHTML = cats.map((cat, i) => `
    <div class="cat-row">
      <input type="text" class="cat-icon" value="${esc(cat.icon || '')}" data-index="${i}" data-field="icon" placeholder="Icon">
      <input type="text" class="cat-name" value="${esc(cat.name || '')}" data-index="${i}" data-field="name" placeholder="Name">
      <button type="button" class="cat-remove" data-index="${i}">✕</button>
    </div>
  `).join('');

  container.querySelectorAll('.cat-remove').forEach(btn => {
    btn.addEventListener('click', () => {
      menuData.categories.splice(parseInt(btn.dataset.index), 1);
      renderCategories();
    });
  });

  document.getElementById('addCategoryBtn').onclick = () => {
    menuData.categories.push({ id: '', name: '', icon: '📌' });
    renderCategories();
  };

  document.getElementById('saveCategoriesBtn').onclick = async () => {
    const rows = container.querySelectorAll('.cat-row');
    const categories = [];
    rows.forEach(row => {
      const icon = row.querySelector('.cat-icon').value.trim();
      const name = row.querySelector('.cat-name').value.trim();
      if (name) categories.push({ id: name.toLowerCase().replace(/\s+/g, '-'), name, icon: icon || '📌' });
    });
    try {
      const res = await fetch('/api/categories', {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ categories })
      });
      if (!res.ok) throw new Error('Failed');
      await loadMenuData();
      renderCategories();
      showToast('Categories saved.', 'success');
    } catch { showToast('Error saving', 'error'); }
  };
}

// ── Cafe Info ───────────────────────────────────────────────────────────────
function renderInfo() {
  const info = menuData?.info || {};
  document.getElementById('infoName').value = info.name || '';
  document.getElementById('infoTagline').value = info.tagline || '';
  document.getElementById('infoAddress').value = info.address || '';
  document.getElementById('infoPhone').value = info.phone || '';
  document.getElementById('infoEmail').value = info.email || '';

  const hours = info.hours || [];
  const editor = document.getElementById('hoursEditor');
  editor.innerHTML = hours.map((h, i) => `
    <div class="hours-row">
      <input type="text" class="hours-days" value="${esc(h.days || '')}" data-index="${i}" data-field="days" placeholder="e.g. Mon—Fri">
      <input type="text" class="hours-time" value="${esc(h.time || '')}" data-index="${i}" data-field="time" placeholder="7:00 AM — 7:00 PM">
      <button type="button" class="cat-remove hours-del" data-index="${i}">✕</button>
    </div>
  `).join('');

  editor.querySelectorAll('.hours-del').forEach(btn => {
    btn.addEventListener('click', () => {
      menuData.info.hours.splice(parseInt(btn.dataset.index), 1);
      renderInfo();
    });
  });

  document.getElementById('addHoursBtn').onclick = () => {
    if (!menuData.info.hours) menuData.info.hours = [];
    menuData.info.hours.push({ days: '', time: '' });
    renderInfo();
  };
}

// ── Forms ───────────────────────────────────────────────────────────────────
function setupForms() {
  document.getElementById('infoForm').addEventListener('submit', async (e) => {
    e.preventDefault();
    const rows = document.querySelectorAll('#hoursEditor .hours-row');
    const hours = [];
    rows.forEach(row => {
      const days = row.querySelector('.hours-days').value.trim();
      const time = row.querySelector('.hours-time').value.trim();
      if (days) hours.push({ days, time });
    });

    const info = {
      name: document.getElementById('infoName').value.trim(),
      tagline: document.getElementById('infoTagline').value.trim(),
      address: document.getElementById('infoAddress').value.trim(),
      phone: document.getElementById('infoPhone').value.trim(),
      email: document.getElementById('infoEmail').value.trim(),
      hours
    };

    try {
      const res = await fetch('/api/info', {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(info)
      });
      if (!res.ok) throw new Error('Failed');
      await loadMenuData();
      showToast('Cafe info saved.', 'success');
    } catch { showToast('Error saving', 'error'); }
  });

  document.getElementById('passwordForm').addEventListener('submit', async (e) => {
    e.preventDefault();
    const errEl = document.getElementById('passwordError');
    const okEl = document.getElementById('passwordSuccess');
    errEl.textContent = '';
    okEl.textContent = '';

    const current = document.getElementById('currentPassword').value;
    const newPw = document.getElementById('newPassword').value;
    const confirm = document.getElementById('confirmPassword').value;

    if (newPw !== confirm) { errEl.textContent = 'Passwords do not match.'; return; }
    if (newPw.length < 6) { errEl.textContent = 'At least 6 characters.'; return; }

    try {
      const check = await fetch('/api/login', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ password: current })
      });
      if (!(await check.json()).success) {
        errEl.textContent = 'Current password is incorrect.';
        return;
      }

      const res = await fetch('/api/change-password', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ newPassword: newPw })
      });
      const data = await res.json();
      if (data.success) {
        okEl.textContent = 'Password updated.';
        document.getElementById('passwordForm').reset();
      } else {
        errEl.textContent = data.error || 'Error updating.';
      }
    } catch { errEl.textContent = 'Connection error.'; }
  });
}

// ── Tables & Orders ────────────────────────────────────────────────────────
let tablesSetup = false;

function setupTablesSection() {
  if (tablesSetup) { renderOrders(); return; }
  tablesSetup = true;

  document.getElementById('saveTablesBtn').addEventListener('click', saveTableCount);
  document.getElementById('loadQrBtn').addEventListener('click', loadQrCodes);
  document.getElementById('refreshOrdersBtn').addEventListener('click', () => { renderOrders(); });

  // Set current table count
  document.getElementById('tableCount').value = menuData.tables || 0;
  renderOrders();
}

async function saveTableCount() {
  const count = parseInt(document.getElementById('tableCount').value);
  if (isNaN(count) || count < 0 || count > 100) {
    return showToast('Enter 0–100', 'error');
  }
  try {
    const res = await fetch('/api/tables', {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ count })
    });
    if (!res.ok) throw new Error('Failed');
    menuData.tables = count;
    showToast(`Saved: ${count} tables`, 'success');
  } catch { showToast('Error saving', 'error'); }
}

async function loadQrCodes() {
  const grid = document.getElementById('qrGrid');
  grid.innerHTML = '<p style="color:var(--parchment);font-size:0.82rem;padding:20px;">Generating QR codes…</p>';
  try {
    const res = await fetch('/api/qr');
    if (!res.ok) throw new Error('Failed');
    const qrs = await res.json();

    if (qrs.length === 0) {
      grid.innerHTML = '<p style="color:var(--parchment);font-size:0.82rem;padding:32px;">No tables configured. Set the number above first.</p>';
      return;
    }

    grid.innerHTML = qrs.map(q => `
      <div class="qr-card">
        <img src="${q.dataUrl}" alt="QR for Table ${q.table}" width="150" height="150">
        <div class="qr-label">Table ${q.table}</div>
        <div class="qr-url">${esc(q.url)}</div>
      </div>
    `).join('');

    showToast(`${qrs.length} QR codes ready for print`, 'success');
  } catch (err) {
    console.error(err);
    grid.innerHTML = '<p style="color:var(--cherry);font-size:0.82rem;padding:32px;">Failed to generate QR codes.</p>';
  }
}

async function renderOrders() {
  const container = document.getElementById('ordersContainer');
  try {
    const res = await fetch('/api/orders');
    if (!res.ok) throw new Error('Failed');
    const orders = await res.json();
    // Only show active orders (hide cancelled & paid)
    const activeOrders = orders.filter(o => o.status === 'pending' || o.status === 'served');

    if (activeOrders.length === 0) {
      container.innerHTML = '<p style="color:var(--parchment);font-size:0.82rem;padding:16px 0;">No active orders.</p>';
      return;
    }

    const statusLabel = { pending: 'New', served: 'Served', paid: 'Paid', cancelled: 'Cancelled' };
    const statusClass = { pending: 'badge-order-new', served: 'badge-order-served', paid: 'badge-order-paid', cancelled: 'badge-order-cancelled' };

    container.innerHTML = activeOrders.map(o => `
      <div class="order-card">
        <div class="order-card-head">
          <div>
            <span class="order-tbl">Table ${o.table}</span>
            <span class="order-time">${timeAgo(o.createdAt)}</span>
          </div>
          <span class="badge ${statusClass[o.status] || ''}">${statusLabel[o.status] || o.status}</span>
        </div>
        <div class="order-card-body">
          <ul class="order-items">
            ${o.items.map(i => i.mid
              ? `<li>${i.qty}× ${esc(i.name)} <span>₹${(i.price * i.qty).toFixed(0)}</span></li>`
              : `<li class="order-item-custom">"${esc(i.text)}"</li>`
            ).join('')}
          </ul>
          ${o.note ? `<p class="order-note">📝 ${esc(o.note)}</p>` : ''}
          <p class="order-total">Total: ₹${o.total.toFixed(0)}</p>
        </div>
        ${`
          <div class="order-card-actions">
            ${o.status === 'pending' ? `<button class="btn act-order serve" data-id="${o.id}" data-status="served">✓ Served</button>` : ''}
            ${o.status === 'served' ? `<button class="btn act-order paid" data-id="${o.id}" data-status="paid">$ Paid</button>` : ''}
            ${o.status !== 'paid' ? `<button class="btn btn-ghost act-order cancel" data-id="${o.id}" data-status="cancelled">✕ Cancel</button>` : ''}
          </div>
        `}
      </div>
    `).join('');

    // Wire up action buttons
    container.querySelectorAll('.act-order').forEach(btn => {
      btn.addEventListener('click', async () => {
        const id = btn.dataset.id;
        const status = btn.dataset.status;
        try {
          const res = await fetch(`/api/orders/${id}`, {
            method: 'PUT',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ status })
          });
          if (!res.ok) throw new Error('Failed');
          showToast(`Order ${status}`, 'success');
          renderOrders();
        } catch { showToast('Error updating', 'error'); }
      });
    });
  } catch (err) {
    console.error(err);
    container.innerHTML = '<p style="color:var(--cherry);">Failed to load orders.</p>';
  }
}

function timeAgo(iso) {
  const diff = Math.floor((Date.now() - new Date(iso).getTime()) / 1000);
  if (diff < 60) return 'just now';
  if (diff < 3600) return `${Math.floor(diff / 60)}m ago`;
  if (diff < 86400) return `${Math.floor(diff / 3600)}h ago`;
  const d = new Date(iso);
  return d.toLocaleDateString('en-US', { month: 'short', day: 'numeric', hour: 'numeric', minute: '2-digit' });
}

// ── Toast ───────────────────────────────────────────────────────────────────
function showToast(msg, type = 'success') {
  const container = document.getElementById('toastContainer');
  if (!container) return;

  const toast = document.createElement('div');
  toast.className = `toast ${type}`;
  toast.innerHTML = `<span>${type === 'success' ? '✓' : '✗'}</span> ${msg}`;
  container.appendChild(toast);

  setTimeout(() => {
    toast.style.opacity = '0';
    toast.style.transition = 'opacity 0.25s';
    setTimeout(() => toast.remove(), 250);
  }, 2800);
}

// ── Utils ───────────────────────────────────────────────────────────────────
function esc(str) {
  const div = document.createElement('div');
  div.textContent = str || '';
  return div.innerHTML;
}

function adminSvgIcon(category) {
  const svgs = {
    'coffee': '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M4 4h14v12a2 2 0 01-2 2H6a2 2 0 01-2-2V4z"/><path d="M18 9h2a2 2 0 012 2v1a2 2 0 01-2 2h-2"/><ellipse cx="8" cy="14" rx="2" ry="1.5"/><path d="M8 1v2" opacity="0.4"/><path d="M6 0v2" opacity="0.3"/><path d="M10 0v2" opacity="0.3"/></svg>',
    'tea': '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M5 8h10a3 3 0 013 3v3a3 3 0 01-3 3H5a3 3 0 01-3-3v-3a3 3 0 013-3z"/><path d="M2 11l-2 3h2l1-3"/><path d="M7 8V6a1 1 0 011-1h2a1 1 0 011 1v2"/><circle cx="10" cy="3.5" r="1.2"/><path d="M8 1v2" opacity="0.4"/><path d="M10 0v2" opacity="0.3"/><path d="M12 1v2" opacity="0.3"/></svg>',
    'pastries': '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M4 16C4 16 6 10 12 8s10 0 10 0c-4 2-6 8-6 8"/><path d="M5 14c1-3 4-6 7-7"/><path d="M19 14c-1-3-4-6-7-7"/><path d="M8 10h8" opacity="0.3"/></svg>',
    'food': '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><ellipse cx="12" cy="18" rx="10" ry="3"/><rect x="8" y="8" width="8" height="7" rx="1"/><line x1="10" y1="9.5" x2="14" y2="9.5" opacity="0.4"/><line x1="10" y1="11.5" x2="14" y2="11.5" opacity="0.3"/><ellipse cx="12" cy="16" rx="3" ry="2" fill="currentColor" opacity="0.15"/></svg>'
  };
  return svgs[category] || svgs['coffee'];
}