const $ = (id) => document.getElementById(id);
const msg = (t) => $("msg").textContent = typeof t === 'string' ? t : JSON.stringify(t, null, 2);
const tokenKey = 'asset_tracker_token';
let categories = [];

function token(){ return localStorage.getItem(tokenKey) || ''; }

async function api(path, method='GET', body){
  const headers = {};
  if(token()) headers['Authorization'] = `Bearer ${token()}`;
  if(body) headers['Content-Type'] = 'application/json';
  const res = await fetch(path, { method, headers, body: body ? JSON.stringify(body) : undefined });
  const data = await res.json().catch(() => ({}));
  if(!res.ok) throw new Error(data.error || `${res.status}`);
  return data;
}

async function doLogin(){
  try{
    const data = await api('/api/v1/auth/login', 'POST', {
      username: $('username').value.trim(),
      password: $('password').value
    });
    localStorage.setItem(tokenKey, data.access_token);
    $('login-section').classList.add('hidden');
    $('app-section').classList.remove('hidden');
    await reloadAll();
    msg('登录成功');
  }catch(e){ msg(`登录失败: ${e.message}`); }
}

async function loadCategories(){
  const data = await api('/api/v1/categories');
  categories = data.data || [];
  $('category-list').innerHTML = categories.map(c => `<li>#${c.id} ${c.name} (${c.type})</li>`).join('') || '<li>暂无分类</li>';
  $('asset-category').innerHTML = categories.map(c => `<option value="${c.id}">${c.name}</option>`).join('');
}

async function addCategory(){
  try{
    await api('/api/v1/categories', 'POST', {
      name: $('cat-name').value.trim(),
      type: $('cat-type').value
    });
    $('cat-name').value='';
    await loadCategories();
    msg('分类创建成功');
  }catch(e){ msg(`分类创建失败: ${e.message}`); }
}

function toRFC3339(localVal){
  if(!localVal) return '';
  const d = new Date(localVal);
  return d.toISOString();
}

async function addAsset(){
  try{
    await api('/api/v1/assets', 'POST', {
      name: $('asset-name').value.trim(),
      category_id: Number($('asset-category').value),
      quantity: Number($('asset-quantity').value || 0),
      unit_price: Number($('asset-price').value || 0),
      currency: $('asset-currency').value.trim().toUpperCase(),
      expiry_date: toRFC3339($('asset-expiry').value)
    });
    $('asset-name').value='';
    await loadAssets();
    await loadDashboard();
    msg('资产创建成功');
  }catch(e){ msg(`资产创建失败: ${e.message}`); }
}

async function loadAssets(){
  const data = await api('/api/v1/assets?page=1&page_size=100');
  const rows = data.data || [];
  const map = new Map(categories.map(c => [c.id, c.name]));
  $('asset-tbody').innerHTML = rows.map(a => `<tr>
    <td>${a.id}</td>
    <td>${a.name}</td>
    <td>${map.get(a.category_id) || a.category_id}</td>
    <td>${a.total_value} ${a.currency}</td>
    <td>${a.status}</td>
    <td>${a.expiry_date || '-'}</td>
    <td><button onclick="delAsset(${a.id})">删除</button></td>
  </tr>`).join('') || '<tr><td colspan="7">暂无资产</td></tr>';

  $('asset-cards').innerHTML = rows.map(a => `<div class="asset-card">
    <div class="line"><b>#${a.id} ${a.name}</b><span>${a.status}</span></div>
    <div class="line"><span>分类</span><span>${map.get(a.category_id) || a.category_id}</span></div>
    <div class="line"><span>金额</span><span>${a.total_value} ${a.currency}</span></div>
    <div class="line"><span>到期</span><span>${a.expiry_date || '-'}</span></div>
    <div class="line"><button onclick="delAsset(${a.id})">删除</button></div>
  </div>`).join('') || '<div class="asset-card">暂无资产</div>';
}

async function delAsset(id){
  try{
    await api(`/api/v1/assets/${id}`, 'DELETE');
    await loadAssets();
    await loadDashboard();
    msg(`已删除资产 #${id}`);
  }catch(e){ msg(`删除失败: ${e.message}`); }
}
window.delAsset = delAsset;

async function loadDashboard(){
  const d = await api('/api/v1/dashboard/summary');
  const byCat = (d.by_category || []).map(x => `${x.category_name}: ${x.total_value}`).join('<br>') || '无';
  $('dashboard').innerHTML = `
    <div class="kpi"><b>总资产</b><div>${d.total_assets_value}</div></div>
    <div class="kpi"><b>分类占比</b><div>${byCat}</div></div>
    <div class="kpi"><b>30天到期</b><div>${(d.expiring_in_30_days || []).length} 条</div></div>
  `;
}

async function reloadAll(){
  await loadCategories();
  await loadAssets();
  await loadDashboard();
}

$('login-btn').addEventListener('click', doLogin);
$('add-cat').addEventListener('click', addCategory);
$('add-asset').addEventListener('click', addAsset);
$('refresh-dashboard').addEventListener('click', loadDashboard);

(async function init(){
  if(token()){
    $('login-section').classList.add('hidden');
    $('app-section').classList.remove('hidden');
    try{ await reloadAll(); }catch(e){ msg(`自动加载失败: ${e.message}`); }
  }
})();