import axios, { AxiosInstance, AxiosRequestConfig, AxiosResponse } from 'axios';

// 创建axios实例
const api: AxiosInstance = axios.create({
  baseURL: import.meta.env.VITE_API_BASE_URL || '',
  timeout: 10000,
  headers: {
    'Content-Type': 'application/json',
  },
});

// 请求拦截器
api.interceptors.request.use(
  (config) => {
    // 可以在这里添加token等认证信息
    const token = localStorage.getItem('token');
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => {
    return Promise.reject(error);
  }
);

// 响应拦截器
api.interceptors.response.use(
  (response: AxiosResponse) => {
    // 只返回data部分
    return response.data;
  },
  (error) => {
    // 统一错误处理
    if (error.response) {
      // 服务器返回错误状态码
      switch (error.response.status) {
        case 401:
          // 未授权，可跳转到登录页
          break;
        case 403:
          // 禁止访问
          break;
        case 404:
          // 资源不存在
          break;
        case 500:
          // 服务器错误
          break;
        default:
          break;
      }
    } else if (error.request) {
      // 请求已发出但没有收到响应
      console.error('网络错误，请检查网络连接');
    } else {
      // 请求配置出错
      console.error('请求配置错误:', error.message);
    }
    return Promise.reject(error);
  }
);

// 封装GET请求
export const get = <T = any>(url: string, params?: any, config?: AxiosRequestConfig): Promise<T> => {
  return api.get(url, {
    params,
    ...config,
  });
};

// 封装POST请求
export const post = <T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T> => {
  return api.post(url, data, config);
};

// 封装PUT请求
export const put = <T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T> => {
  return api.put(url, data, config);
};

// 封装DELETE请求
export const del = <T = any>(url: string, params?: any, config?: AxiosRequestConfig): Promise<T> => {
  return api.delete(url, {
    params,
    ...config,
  });
};

// 封装PATCH请求
export const patch = <T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T> => {
  return api.patch(url, data, config);
};

export default api;