import axios, { AxiosInstance, AxiosRequestConfig, AxiosResponse } from 'axios';
import { message } from 'ant-design-vue';

// 创建axios实例
const request: AxiosInstance = axios.create({
  baseURL: '/api',  // 使用 /api 作为统一前缀，超管端路径包含 /v1
  timeout: 30000,
  headers: {
    'Content-Type': 'application/json',
  },
});

// 请求拦截器
request.interceptors.request.use(
  (config) => {
    const token = localStorage.getItem('token');
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => {
    return Promise.reject(error);
  }
);

// 响应拦截器
request.interceptors.response.use(
  (response: AxiosResponse) => {
    const { data } = response;
    // 如果是标准响应格式 { code, message, data }
    if (typeof data === 'object' && data !== null && 'code' in data) {
      // 业务错误码非 200 时抛出错误
      if (data.code !== 200) {
        const error: any = new Error(data.message || '请求失败');
        error.response = response;
        error.code = data.code;
        return Promise.reject(error);
      }
      // 返回 data 字段
      return data.data;
    }
    // 否则直接返回响应数据
    return data;
  },
  (error) => {
    const { response } = error;

    if (response) {
      const { status, data } = response;

      switch (status) {
        case 401:
          message.error('登录已过期，请重新登录');
          localStorage.removeItem('token');
          localStorage.removeItem('user');
          localStorage.removeItem('role');
          localStorage.removeItem('name');
          window.location.href = '/login';
          break;
        case 403:
          // 区分 token 过期/无效和权限不足的场景
          // 如果是 token 问题导致的 403，跳转到登录页
          if (data && typeof data === 'object' && 'code' in data) {
            const errorCode = data.code;
            // token 过期或无效时跳转到登录页
            if (errorCode === 401 || errorCode === 403) {
              message.error(data.message || '登录已过期，请重新登录');
              localStorage.removeItem('token');
              localStorage.removeItem('user');
              localStorage.removeItem('role');
              localStorage.removeItem('name');
              window.location.href = '/login';
              break;
            }
          }
          // 其他情况视为权限不足，显示提示但不跳转
          message.error(data?.message || '没有权限访问');
          break;
        case 404:
          message.error('请求的资源不存在');
          break;
        case 500:
          message.error(data?.message || '服务器错误');
          break;
        default:
          message.error(data?.message || '请求失败');
      }
    } else if (error.code === 'ECONNABORTED') {
      message.error('请求超时');
    } else {
      message.error('网络错误');
    }

    return Promise.reject(error);
  }
);

// 导出请求方法
export default request;

// 通用请求方法
export const http = {
  get<T = any>(url: string, config?: AxiosRequestConfig): Promise<T> {
    return request.get(url, config);
  },

  post<T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T> {
    return request.post(url, data, config);
  },

  put<T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T> {
    return request.put(url, data, config);
  },

  delete<T = any>(url: string, config?: AxiosRequestConfig): Promise<T> {
    return request.delete(url, config);
  },

  patch<T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T> {
    return request.patch(url, data, config);
  },
};