const state = { items: [], editingId: null };
const $ = (selector) => document.querySelector(selector);

async function request(url, options = {}) {
  const response = await fetch(url, { headers: { 'Content-Type': 'application/json' }, ...options });
  const data = await response.json();
  if (!response.ok) throw new Error(data.error || 'Something went wrong.');
  return data;
}

async function load() {
  const query = new URLSearchParams({ q: $('#searchInput').value, type: $('#typeFilter').value, status: $('#statusFilter').value });
  const [items, summary] = await Promise.all([request(`/api/items?${query}`), request('/api/summary')]);
  state.items = items;
  $('#totalCount').textContent = summary.total;
  $('#availableCount').textContent = summary.available;
  $('#checkedOutCount').textContent = summary.checked_out;
  $('#maintenanceCount').textContent = summary.maintenance;
  $('#resultCount').textContent = `${items.length} ${items.length === 1 ? 'item' : 'items'}`;
  renderItems(items);
}

function renderItems(items) {
  const body = $('#inventoryBody');
  $('#emptyState').style.display = items.length ? 'none' : 'block';
  body.innerHTML = items.map((item) => `<tr class="inventory-row"><td><span class="item-title">${escapeHtml(item.name)}</span><span class="item-sub">${escapeHtml([item.brand, item.model].filter(Boolean).join(' · ') || 'No manufacturer details')}</span></td><td><span class="type-pill">${escapeHtml(item.item_type)}</span></td><td><span class="identifier">${escapeHtml(item.serial_number || 'No serial')}<em>${escapeHtml(item.asset_tag || 'No asset tag')}</em></span></td><td><span class="location">${escapeHtml(item.location || 'Unassigned')}</span></td><td><span class="status ${item.status.toLowerCase().replace(' ', '-')}">${escapeHtml(item.status)}</span></td><td><div class="row-actions"><button class="small-action" onclick="editItem(${item.id})">Edit</button><button class="small-action delete" onclick="removeItem(${item.id})">Delete</button></div></td></tr>`).join('');
}

function escapeHtml(value) { return String(value).replace(/[&<>'"]/g, (char) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', "'": '&#39;', '"': '&quot;' }[char])); }
function openModal(item = null) { state.editingId = item?.id || null; $('#modalTitle').textContent = item ? 'Edit item' : 'Add item'; $('#itemForm').reset(); if (item) Object.entries(item).forEach(([key, value]) => { const field = $(`[name="${key}"]`); if (field) field.value = value || ''; }); $('#modal').classList.add('open'); $('[name="name"]').focus(); }
function closeModal() { $('#modal').classList.remove('open'); }
function toast(message) { const element = $('#toast'); element.textContent = message; element.classList.add('show'); setTimeout(() => element.classList.remove('show'), 2500); }

window.editItem = (id) => openModal(state.items.find((item) => item.id === id));
window.removeItem = async (id) => { const item = state.items.find((entry) => entry.id === id); if (!confirm(`Delete "${item.name}"?`)) return; try { await request(`/api/items/${id}`, { method: 'DELETE' }); toast('Item removed from inventory.'); await load(); } catch (error) { toast(error.message); } };

$('#addButton').addEventListener('click', () => openModal());
$('#emptyAddButton').addEventListener('click', () => openModal());
$('#closeModal').addEventListener('click', closeModal);
$('#cancelButton').addEventListener('click', closeModal);
$('#modal').addEventListener('click', (event) => { if (event.target === $('#modal')) closeModal(); });
['searchInput', 'typeFilter', 'statusFilter'].forEach((id) => $(`#${id}`).addEventListener(id === 'searchInput' ? 'input' : 'change', load));
$('#itemForm').addEventListener('submit', async (event) => { event.preventDefault(); const formData = new FormData(event.target); const payload = Object.fromEntries(formData.entries()); try { await request(state.editingId ? `/api/items/${state.editingId}` : '/api/items', { method: state.editingId ? 'PUT' : 'POST', body: JSON.stringify(payload) }); closeModal(); toast(state.editingId ? 'Item updated.' : 'Item added to inventory.'); await load(); } catch (error) { toast(error.message); } });
$('#exportButton').addEventListener('click', () => { if (!state.items.length) return toast('There are no visible items to export.'); const columns = ['name','item_type','brand','model','serial_number','asset_tag','status','location','purchase_date','cpu','ram','gpu','storage','media_format','notes']; const csv = [columns.join(','), ...state.items.map((item) => columns.map((column) => `"${String(item[column] || '').replaceAll('"', '""')}"`).join(','))].join('\n'); const link = document.createElement('a'); link.href = URL.createObjectURL(new Blob([csv], { type: 'text/csv' })); link.download = 'stockroom-inventory.csv'; link.click(); URL.revokeObjectURL(link.href); });
load().catch((error) => toast(error.message));