// 采购相关功能
let editPid = null;

async function loadPurchases() {
  if (!Store.currentRoom) return;
  const token = Store.getToken();
  const res = await fetch('/api/rooms/' + Store.currentRoom + '/purchases', { headers: { 'Authorization': 'Bearer ' + token } });
  const items = await res.json();
  renderPurchasePanel(items);
}

function renderPurchasePanel(items) {
  const container = document.getElementById('purchase-panel-body');
  if (items.length === 0) { container.innerHTML = '<p style="text-align:center;color:#888;padding:40px;">\u6682\u65e0\u91c7\u8d2d\u8bb0\u5f55</p>'; return; }
  const groups = {};
  items.forEach(item => {
    const month = formatMonth(item.created_at);
    if (!groups[month]) groups[month] = [];
    groups[month].push(item);
  });
  let html = '';
  Object.keys(groups).sort().reverse().forEach(month => {
    const monthItems = groups[month];
    const monthTotal = monthItems.reduce((s, i) => s + (i.amount||0), 0);
    html += '<details class="purchase-month-group" open><summary class="purchase-month-header"><span>' + month + '</span><span style="display:flex;align-items:center;gap:6px;">\uffe5' + monthTotal + '<svg class="month-arrow" viewBox="0 0 24 24"><polyline points="6 9 12 15 18 9"/></svg></span></summary>';
    monthItems.forEach(item => {
      var t = item.created_at.split(' ')[1];
      var timeShort = t ? t.substring(0,5) : '';
      var datePart = item.created_at.split(' ')[0];
      var dateShort = datePart ? datePart.substring(5) : '';
      html += '<div class="purchase-item" onclick="openDetail(\'' + item.id + '\')">' +
        '<div class="item-main"><span class="item-name">' + escapeHtml(item.item) + '</span><span class="item-amount">\uffe5' + item.amount + '</span></div>' +
        '<div class="item-meta">' +
          '<span>' + dateShort + ' ' + timeShort + '</span>' +
          '<span>x' + item.quantity + (item.invoice_type !== '\u65e0\u7968' ? ' \u00b7 ' + item.invoice_type : '') + '</span>' +
          '<span class="status-badge ' + item.status + '">' + item.status + '</span>' +
        '</div>' +
      '</div>';
    });
    html += '</details>';
  });
  container.innerHTML = html;
}

function formatMonth(dateStr) {
  var clean = dateStr.replace(/-/g, '/');
  var parts = clean.split('/');
  if (parts.length >= 2) return parts[0] + '\u5e74' + parseInt(parts[1], 10) + '\u6708';
  return dateStr.substring(0,7);
}

async function openDetail(pid) {
  var token = Store.getToken();
  var res = await fetch('/api/purchases/' + pid, { headers: { 'Authorization': 'Bearer ' + token } });
  var p = await res.json();
  editPid = pid;

  document.getElementById('edit-item').value = p.item || '';
  document.getElementById('edit-quantity').value = p.quantity || 0;
  document.getElementById('edit-unit-price').value = p.unit_price || 0;
  document.getElementById('edit-freight').value = p.freight || 0;
  updateAmountSummary();
  document.getElementById('edit-payment-method').value = p.payment_method || '\u672a\u6307\u5b9a';
  document.getElementById('edit-invoice-type').value = p.invoice_type || '\u65e0\u7968';
  document.getElementById('edit-status').value = p.status || '\u5f85\u4ed8\u6b3e';
  updateStatusSummary();
  document.getElementById('edit-applicant').value = p.applicant || '';
  document.getElementById('edit-time').value = p.created_at || '';
  document.getElementById('edit-remarks').value = p.remarks || '';

  renderEditAttachments(p.attachments || []);

  var historyHtml = (p.history || []).map(function(h) {
    return '<li><span class="history-time">' + h.timestamp + '</span> ' + escapeHtml(h.user) + ': ' + escapeHtml(h.action) + '</li>';
  }).join('');
  document.getElementById('edit-history').innerHTML = historyHtml || '<li style="color:#888;">\u6682\u65e0\u64cd\u4f5c\u8bb0\u5f55</li>';
  document.getElementById('edit-history-section').open = false;

  document.getElementById('delete-purchase-btn').style.display = '';
  document.getElementById('delete-purchase-btn').style.marginLeft = '';

  document.querySelectorAll('.edit-group-detail').forEach(function(el) { el.classList.add('hidden'); });
  document.querySelectorAll('.edit-group-summary').forEach(function(el) { el.classList.remove('hidden'); });

  document.getElementById('detail-modal').classList.remove('hidden');
}

function renderEditAttachments(attachments) {
  var container = document.getElementById('edit-attachments');
  if (!attachments || attachments.length === 0) {
    container.innerHTML = '<span style="color:#888;font-size:14px;">\u6682\u65e0\u9644\u4ef6</span>';
    return;
  }
  container.innerHTML = attachments.map(function(a) {
    return '<div class="attach-thumb-wrap">' +
      '<img class="attach-thumb" src="' + a.file_path + '" ondblclick="onImgThumbDblClick(this)">' +
      '<button class="attach-del-btn" onclick="deleteAttachment(event, \'' + encodeURIComponent(a.file_path) + '\')">' +
        '<svg viewBox="0 0 24 24"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg>' +
      '</button>' +
    '</div>';
  }).join('');
}

function updateAmountSummary() {
  var q = parseFloat(document.getElementById('edit-quantity').value) || 0;
  var up = parseFloat(document.getElementById('edit-unit-price').value) || 0;
  var f = parseFloat(document.getElementById('edit-freight').value) || 0;
  var total = (q * up + f).toFixed(2);
  document.getElementById('amount-summary').textContent = total + ', \u6570\u91cf' + q + ', \u5355\u4ef7' + up + ', \u90ae\u8d39' + f;
}

function updateStatusSummary() {
  var pm = document.getElementById('edit-payment-method').value;
  var iv = document.getElementById('edit-invoice-type').value;
  var st = document.getElementById('edit-status').value;
  document.getElementById('status-summary').textContent = st + ', ' + pm + ', ' + iv;
}

function toggleEditGroup(groupId) {
  var detail = document.getElementById(groupId);
  var summary = detail.previousElementSibling;
  var isOpen = !detail.classList.contains('hidden');
  if (isOpen) {
    detail.classList.add('hidden');
    summary.classList.remove('hidden');
  } else {
    detail.classList.remove('hidden');
    summary.classList.add('hidden');
  }
}

async function savePurchase() {
  if (!editPid) return;
  var token = Store.getToken();
  var body = {
    item: document.getElementById('edit-item').value,
    quantity: parseFloat(document.getElementById('edit-quantity').value) || 0,
    unit_price: parseFloat(document.getElementById('edit-unit-price').value) || 0,
    freight: parseFloat(document.getElementById('edit-freight').value) || 0,
    payment_method: document.getElementById('edit-payment-method').value,
    invoice_type: document.getElementById('edit-invoice-type').value,
    status: document.getElementById('edit-status').value,
    applicant: document.getElementById('edit-applicant').value,
    remarks: document.getElementById('edit-remarks').value,
    created_at: document.getElementById('edit-time').value
  };
  var res = await fetch('/api/purchases/' + editPid, {
    method: 'PUT',
    headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
    body: JSON.stringify(body)
  });
  var result = await res.json();
  if (result.success) {
    closeDetailModal();
    loadPurchases();
  } else {
    alert('\u4fdd\u5b58\u5931\u8d25\uff1a' + (result.error || '\u672a\u77e5\u9519\u8bef'));
  }
}

async function deletePurchaseDetail() {
  if (!editPid) return;
  if (!confirm('\u786e\u5b9a\u8981\u5220\u9664\u6b64\u91c7\u8d2d\u8bb0\u5f55\u5417\uff1f')) return;
  var token = Store.getToken();
  var res = await fetch('/api/purchases/' + editPid, {
    method: 'DELETE',
    headers: { 'Authorization': 'Bearer ' + token }
  });
  if (res.ok) {
    closeDetailModal();
    loadPurchases();
  } else {
    var err = await res.json();
    alert('\u5220\u9664\u5931\u8d25\uff1a' + (err.error || '\u672a\u77e5\u9519\u8bef'));
  }
}

async function deleteAttachment(event, encodedPath) {
  event.stopPropagation();
  var filePath = decodeURIComponent(encodedPath);
  if (!confirm('\u786e\u5b9a\u5220\u9664\u6b64\u9644\u4ef6\u5417\uff1f')) return;
  var token = Store.getToken();
  var res = await fetch('/api/purchases/' + editPid + '/attachments', {
    method: 'DELETE',
    headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
    body: JSON.stringify({ file_path: filePath })
  });
  if (res.ok) openDetail(editPid);
}

async function handleDetailFileUpload(event) {
  var files = event.target.files;
  if (!files.length) return;
  var token = Store.getToken();
  var paths = [];
  try {
    for (var i = 0; i < files.length; i++) {
      var file = files[i];
      var blob = file;
      if (file.size > 1 * 1024 * 1024) blob = await compressImage(file);
      var formData = new FormData(); formData.append('file', blob, file.name || 'image.jpg');
      var res = await fetch('/api/upload', { method: 'POST', headers: { 'Authorization': 'Bearer ' + token }, body: formData });
      var data = await res.json();
      if (data.path) paths.push(data.path);
    }
    if (paths.length) {
      await fetch('/api/purchases/' + editPid + '/attachments', {
        method: 'POST',
        headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
        body: JSON.stringify({ file_paths: paths })
      });
      openDetail(editPid);
    }
  } catch(e) { alert('\u4e0a\u4f20\u5931\u8d25\uff0c\u8bf7\u91cd\u8bd5'); }
}

function closeDetailModal() {
  document.getElementById('detail-modal').classList.add('hidden');
  editPid = null;
}

async function handlePurchaseFileSelect(event) {
  var files = event.target.files;
  if (!files.length) return;
  var token = Store.getToken();
  try {
    for (var i = 0; i < files.length; i++) {
      var file = files[i];
      var blob = file;
      if (file.size > 1 * 1024 * 1024) blob = await compressImage(file);
      var formData = new FormData(); formData.append('file', blob, file.name || 'image.jpg');
      var res = await fetch('/api/upload', { method: 'POST', headers: { 'Authorization': 'Bearer ' + token }, body: formData });
      var data = await res.json();
      if (data.path) Store.pendingUploads.push(data.path);
    }
  } catch(e) { alert('\u56fe\u7247\u4e0a\u4f20\u5931\u8d25'); }
}

function sendFromPurchase() {
  var input = document.getElementById('purchase-msg-input');
  var text = input.value.trim();
  if (!text && Store.pendingUploads.length === 0) return;
  Store.pendingPurchaseText = text;
  input.value = '';
  openChatFromPurchase();
}

async function openSummary() {
  var token = Store.getToken();
  var res = await fetch('/api/summary', { headers: { 'Authorization': 'Bearer ' + token } });
  var summary = await res.json();
  var html = '';
  if (summary.length === 0) html = '<p>\u6682\u65e0\u91c7\u8d2d\u8bb0\u5f55</p>';
  else {
    summary.forEach(function(s) {
      html += '<div class="summary-card" onclick="event.stopPropagation(); closeSummaryModal(); openPurchasePage(\'' + s.room_id + '\')" style="margin:8px 0;"><h4>' + escapeHtml(s.room_name) + '</h4><p>' + s.purchase_count + ' \u6761\uff0c\u5408\u8ba1 \uffe5' + s.total_amount + '</p></div>';
    });
  }
  document.getElementById('summary-title').textContent = '\u91c7\u8d2d\u6c47\u603b';
  document.getElementById('summary-content').innerHTML = html;
  document.getElementById('summary-modal').classList.remove('hidden');
}

function closeSummaryModal() { document.getElementById('summary-modal').classList.add('hidden'); }

function openCreateRoom() {
  document.getElementById('create-modal').classList.remove('hidden');
  var isAdmin = localStorage.getItem('isAdmin') === 'true';
  document.getElementById('white-list').style.display = isAdmin ? '' : 'none';
}
function closeCreateModal() { document.getElementById('create-modal').classList.add('hidden'); }
async function confirmCreateRoom() {
  var name = document.getElementById('new-room-name').value.trim();
  if (!name) return alert('\u8bf7\u8f93\u5165\u540d\u79f0');
  var isAdmin = localStorage.getItem('isAdmin') === 'true';
  var whiteList = isAdmin ? document.getElementById('white-list').value.trim() : localStorage.getItem('currentUser');
  var token = Store.getToken();
  await fetch('/api/rooms', { method: 'POST', headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' }, body: JSON.stringify({ name: name, whiteList: whiteList }) });
  closeCreateModal();
  loadRooms();
}

function openManageRoom(roomId) {
  var room = Store.rooms.find(function(r) { return r.id === roomId; });
  if (!room) return;
  var isAdmin = localStorage.getItem('isAdmin') === 'true';
  document.getElementById('manage-title').textContent = '\u7f16\u8f91\u7fa4\u804a';
  document.getElementById('manage-room-name').value = room.name;
  document.getElementById('manage-white-list').value = room.white_list || '';
  document.getElementById('manage-white-list').style.display = isAdmin ? '' : 'none';
  document.getElementById('manage-modal').dataset.roomId = roomId;
  document.getElementById('manage-modal').classList.remove('hidden');
}

function closeManageModal() { document.getElementById('manage-modal').classList.add('hidden'); }

async function saveRoom() {
  var roomId = document.getElementById('manage-modal').dataset.roomId;
  var name = document.getElementById('manage-room-name').value.trim();
  var isAdmin = localStorage.getItem('isAdmin') === 'true';
  var whiteList = isAdmin ? document.getElementById('manage-white-list').value.trim() : undefined;
  if (!name) return alert('\u8bf7\u8f93\u5165\u7fa4\u804a\u540d\u79f0');
  var token = Store.getToken();
  var res = await fetch('/api/rooms/' + roomId, {
    method: 'PUT', headers: { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
    body: JSON.stringify({ name: name, whiteList: whiteList })
  });
  if (res.ok) { closeManageModal(); loadRooms(); }
  else { var err = await res.json(); alert(err.error || '\u66f4\u65b0\u5931\u8d25'); }
}

async function deleteRoom() {
  if (!confirm('\u786e\u5b9a\u8981\u5220\u9664\u8be5\u7fa4\u804a\u5417\uff1f\u6240\u6709\u6d88\u606f\u548c\u91c7\u8d2d\u6570\u636e\u5c06\u88ab\u6c38\u4e45\u5220\u9664\u3002')) return;
  var roomId = document.getElementById('manage-modal').dataset.roomId;
  var token = Store.getToken();
  var res = await fetch('/api/rooms/' + roomId, { method: 'DELETE', headers: { 'Authorization': 'Bearer ' + token } });
  if (res.ok) {
    closeManageModal();
    loadRooms();
    if (Store.currentRoom === roomId) showList();
  } else { var err = await res.json(); alert(err.error || '\u5220\u9664\u5931\u8d25'); }
}

function initSwipeGestures() {
  var purchasePage = document.getElementById('purchase-page');
  var chatPage = document.getElementById('chat-page');
  var startX = 0;

  purchasePage.addEventListener('touchstart', function(e) { startX = e.touches[0].clientX; }, { passive: true });
  purchasePage.addEventListener('touchend', function(e) {
    if (!startX) return;
    var diffX = e.changedTouches[0].clientX - startX;
    if (Math.abs(diffX) > 50) {
      if (diffX > 30) showList();
      else if (diffX < -30) openChatFromPurchase();
    }
    startX = 0;
  }, { passive: true });

  chatPage.addEventListener('touchstart', function(e) { startX = e.touches[0].clientX; }, { passive: true });
  chatPage.addEventListener('touchend', function(e) {
    if (!startX) return;
    var diffX = e.changedTouches[0].clientX - startX;
    if (Math.abs(diffX) > 50) backToPurchase();
    startX = 0;
  }, { passive: true });
}