import { useUserStore } from '@/store';

const BASE_URL = '/api/v1';

// 后端统一响应格式
export interface ApiResponse<T = any> {
  code: number;
  message: string;
  data: T;
}

// 列表响应格式
export interface ListResponse<T = any> {
  list: T[];
  total: number;
}

// 通用请求函数
async function request<T = any>(
  method: string,
  url: string,
  body?: any,
  params?: Record<string, any>
): Promise<T> {
  // 构建 URL（含 query params）
  let fullUrl = `${BASE_URL}${url}`;
  if (params) {
    const searchParams = new URLSearchParams();
    Object.entries(params).forEach(([key, value]) => {
      if (value !== undefined && value !== null && value !== '') {
        searchParams.append(key, String(value));
      }
    });
    const qs = searchParams.toString();
    if (qs) fullUrl += `?${qs}`;
  }

  // 获取 token
  const token = useUserStore.getState().token;

  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
  };
  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const response = await fetch(fullUrl, {
    method,
    headers,
    body: body ? JSON.stringify(body) : undefined,
  });

  if (response.status === 401) {
    useUserStore.getState().logout();
    window.location.href = '/login';
    throw new Error('登录已过期，请重新登录');
  }

  const json: ApiResponse<T> = await response.json();

  if (json.code && json.code !== 200) {
    throw new Error(json.message || '请求失败');
  }

  return json.data;
}

// 导出便捷方法
export const http = {
  get: <T = any>(url: string, params?: Record<string, any>) =>
    request<T>('GET', url, undefined, params),
  post: <T = any>(url: string, body?: any) =>
    request<T>('POST', url, body),
  put: <T = any>(url: string, body?: any) =>
    request<T>('PUT', url, body),
  delete: <T = any>(url: string) =>
    request<T>('DELETE', url),
};

export default http;