const API = (() => {
  const base = '/api';
  async function request(path, opts = {}) {
    const overlay = document.getElementById('overlay');
    overlay.classList.remove('hidden');
    try {
      const res = await fetch(base + path, {
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        ...opts
      });
      if (!res.ok) throw new Error(await res.text());
      return await res.json();
    } catch (e) {
      toast(e.message || '请求失败');
      throw e;
    } finally {
      overlay.classList.add('hidden');
    }
  }
  async function requestQuiet(path, opts = {}) {
    // 创建超时控制器
    const controller = opts.signal ? null : new AbortController();
    const timeoutId = controller ? setTimeout(() => {
      controller.abort();
      console.warn('[API] 请求超时:', path);
    }, 10000) : null; // 10秒超时
    
    try {
      const res = await fetch(base + path, {
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        signal: opts.signal || (controller ? controller.signal : undefined),
        ...opts
      });
      if (timeoutId) clearTimeout(timeoutId);
      if (!res.ok) throw new Error(await res.text());
      return await res.json();
    } catch (e) {
      if (timeoutId) clearTimeout(timeoutId);
      // 忽略取消的请求
      if (e.name === 'AbortError') {
        return { list: [] };
      }
      throw e;
    }
  }
  async function uploadFile(path, formData) {
    const overlay = document.getElementById('overlay');
    overlay.classList.remove('hidden');
    try {
      const res = await fetch(base + path, {
        method: 'POST',
        body: formData,
        credentials: 'include'
      });
      if (!res.ok) throw new Error(await res.text());
      return await res.json();
    } catch (e) {
      toast(e.message || '上传失败');
      throw e;
    } finally {
      overlay.classList.add('hidden');
    }
  }
  
  async function uploadFileWithProgress(path, formData, onProgress) {
    return new Promise((resolve, reject) => {
      const xhr = new XMLHttpRequest();
      
      // 上传进度
      xhr.upload.addEventListener('progress', (e) => {
        if (e.lengthComputable && onProgress) {
          const percent = Math.round((e.loaded / e.total) * 100);
          const loaded = e.loaded;
          const total = e.total;
          onProgress({ percent, loaded, total });
        }
      });
      
      // 完成
      xhr.addEventListener('load', () => {
        if (xhr.status >= 200 && xhr.status < 300) {
          try {
            const result = JSON.parse(xhr.responseText);
            resolve(result);
          } catch (e) {
            reject(new Error('解析响应失败'));
          }
        } else {
          reject(new Error(xhr.responseText || '上传失败'));
        }
      });
      
      // 错误
      xhr.addEventListener('error', () => {
        reject(new Error('网络错误'));
      });
      
      // 中止
      xhr.addEventListener('abort', () => {
        reject(new Error('上传已取消'));
      });
      
      xhr.open('POST', base + path);
      xhr.withCredentials = true;
      xhr.send(formData);
    });
  }
  function toast(msg) {
    const t = document.getElementById('toast');
    t.textContent = msg;
    t.classList.add('show');
    setTimeout(() => t.classList.remove('show'), 2000);
  }
  return {
    // 通用HTTP方法
    get: (path) => request(path.replace('/api', '')),
    post: (path, data) => request(path.replace('/api', ''), { method: 'POST', body: JSON.stringify(data) }),
    put: (path, data) => request(path.replace('/api', ''), { method: 'PUT', body: JSON.stringify(data) }),
    delete: (path) => request(path.replace('/api', ''), { method: 'DELETE' }),
    
    login: (username, password) => request('/auth/login', { method: 'POST', body: JSON.stringify({ username, password }) }),
    me: () => request('/auth/me'),
    logout: () => request('/auth/logout', { method: 'POST' }),
    dashboard: () => request('/dashboard'),
    overview: () => request('/overview'),
    uploadMac: data => request('/upload/mac', { method: 'POST', body: JSON.stringify(data) }),
    uploadMacFile: file => {
      const fd = new FormData();
      fd.append('file', file);
      return uploadFile('/upload/mac-file', fd);
    },
    uploadStats: data => request('/upload/stats', { method: 'POST', body: JSON.stringify(data) }),
    uploadRepairs: data => request('/upload/repairs', { method: 'POST', body: JSON.stringify(data) }),
    uploadDefects: data => request('/upload/defects', { method: 'POST', body: JSON.stringify(data) }),
    uploadDefectsFile: file => {
      const fd = new FormData();
      fd.append('file', file);
      return uploadFile('/upload/defects-file', fd);
    },
    uploadShipments: data => request('/upload/shipments', { method: 'POST', body: JSON.stringify(data) }),
    devices: () => request('/collect/devices'),
    environment: () => request('/collect/environment'),
    personnel: () => request('/collect/personnel'),
    qa: () => request('/collect/qa'),
    production: () => request('/collect/production'),
    addPersonnel: (name, role) => request('/collect/personnel', { method: 'POST', body: JSON.stringify({ name, role }) }),
    listMac: () => request('/list/mac'),
    listStats: () => request('/list/stats'),
    listRepairs: () => request('/list/repairs'),
    listDefects: () => request('/list/defects'),
    listShipments: () => request('/list/shipments'),
    auditPdd: (params={}) => request('/audit/pdd' + buildQuery(params)),
    auditYt: (params={}) => request('/audit/yt' + buildQuery(params)),
    auditPddQuiet: (params={}) => requestQuiet('/audit/pdd' + buildQuery(params)),
    auditYtQuiet: (params={}) => requestQuiet('/audit/yt' + buildQuery(params)),
    exportExcel: params => request('/export/excel', { method: 'POST', body: JSON.stringify(params) }),
    exportPdf: params => request('/export/pdf', { method: 'POST', body: JSON.stringify(params) }),
    toast,
    adminUsers: () => request('/admin/users'),
    resetPassword: (username, new_password) => request('/admin/reset-password', { method: 'POST', body: JSON.stringify({ username, new_password }) }),
    changePassword: (username, new_password) => request('/admin/change-password', { method: 'POST', body: JSON.stringify({ username, new_password }) }),
    deleteUser: username => request('/admin/delete-user', { method: 'POST', body: JSON.stringify({ username }) }),
    clearModule: module => request('/admin/clear', { method: 'POST', body: JSON.stringify({ module }) }),
    getNotifications: () => requestQuiet('/notifications'),
    getUnreadCount: () => requestQuiet('/notifications/unread-count'),
    markNotificationRead: id => requestQuiet('/notifications/mark-read', { method: 'POST', body: JSON.stringify({ id }) }),
    markAllNotificationsRead: () => requestQuiet('/notifications/mark-all-read', { method: 'POST' }),
    deleteReadNotifications: () => requestQuiet('/notifications/delete-read', { method: 'POST' }),
    updateShipmentsPlatform: () => request('/shipments/update-platform', { method: 'POST' }),
    listSopFiles: () => request('/sop/list'),
    uploadSopFile: (file, description) => {
      const fd = new FormData();
      fd.append('file', file);
      fd.append('description', description);
      return uploadFile('/sop/upload', fd);
    },
    uploadSopFileWithProgress: (file, description, onProgress) => {
      const fd = new FormData();
      fd.append('file', file);
      fd.append('description', description);
      return uploadFileWithProgress('/sop/upload', fd, onProgress);
    },
    deleteSopFile: id => request(`/sop/delete/${id}`, { method: 'POST' })
  };
})();

function buildQuery(params){
  const q = new URLSearchParams();
  if(params.start) q.set('start', params.start);
  if(params.end) q.set('end', params.end);
  if(params.limit) q.set('limit', params.limit);
  if(params.order) q.set('order', params.order);
  const s = q.toString();
  return s ? ('?' + s) : '';
}