import axios, { AxiosInstance, AxiosRequestConfig, Method, AxiosResponse } from 'axios';
import { Toast } from 'antd-mobile';

const DEFAULT_DEBOUNCE_GAP = 1000;
const debounceMap = new Map<string, number>();

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

instance.interceptors.request.use(config => {
  const token = localStorage.getItem('token');
  if (token) {
    config.headers = config.headers || {};
    config.headers['Authorization'] = `Bearer ${token}`;
  }
  return config;
});

instance.interceptors.response.use(
  (res: AxiosResponse) => {
    const { code, success, msg } = res.data || {};
    if (code === 200 || success) {
      return res.data.data ?? res.data;
    }
    // 业务错误统一提示
    Toast.show({ content: msg || '接口错误', position: 'top' });
    // 分类处理
    if (code === 401) {
      // 未登录或登录失效
      localStorage.removeItem('token');
    } else if (code === 403) {
      // 无权限
    } else if (code === 500) {
      // 服务端异常
    }
    return Promise.reject(msg || '接口错误');
  },
  err => {
    // 网络错误、超时等
    Toast.show({ content: err.message || '网络异常', position: 'top' });
    return Promise.reject(err);
  }
);

/**
 * @param url 接口地址
 * @param data 请求参数
 * @param method 请求方法
 * @param config axios 配置
 * @param debounceGap 防抖时间（毫秒），不传则用默认值
 */
export function request(
  url: string,
  data?: any,
  method: Method = 'GET',
  config?: AxiosRequestConfig,
  debounceGap?: number
): Promise<any> {
  const gap = typeof debounceGap === 'number' ? debounceGap : DEFAULT_DEBOUNCE_GAP;
  const key = `${method}_${url}_${JSON.stringify(data)}`;
  const now = Date.now();
  const last = debounceMap.get(key) || 0;
  if (gap > 0 && now - last < gap) {
    Toast.show({ content: '请求过于频繁，请稍后再试', position: 'top' });
    return Promise.reject('请求过于频繁，请稍后再试');
  }
  debounceMap.set(key, now);

  const axiosConfig: AxiosRequestConfig = {
    url,
    method,
    ...config,
  };
  if (method.toUpperCase() === 'GET') {
    axiosConfig.params = data;
  } else {
    axiosConfig.data = data;
  }
  return instance(axiosConfig);
}

export default request;