import axios, { AxiosRequestConfig } from 'axios';

import { DEFAULT_HEADER } from '../constants';
import { logger, isFormData, isUndefined, getParamStrFromObj } from '../utils';

/**
 * 获取使用 axios 发起请求后的 promise 对象
 */
export const getAxiosPromise = ({
  url,
  data,
  method,
  headers: rawHeaders,
  withCredentials = true,
  transformRequest: rawTransformRequest,
  ...rest
}: AxiosRequestConfig) => {
  const isFD = isFormData(data);
  const isPost = method.toLowerCase() === 'post';

  logger.log(`Req Url: ${url}`);
  if (data && (Object.keys(data).length || isFD)) {
    logger.log('Req Data:', data);
  }

  const transformRequest = (() => {
    // 优先使用用户的配置
    if (!isUndefined(rawTransformRequest)) return rawTransformRequest;
    if (isFD) return null;
    // 如果使用 post 的请求方式，自动对其 stringify
    if (isPost) return x => JSON.stringify(x);
    return getParamStrFromObj;
  })();

  const headers = (() => {
    if (!isUndefined(rawHeaders)) return rawHeaders;
    if (isPost) return { 'Content-Type': 'application/json;charset=utf-8' };
    return DEFAULT_HEADER;
  })();

  return axios({
    url,
    data,
    method,
    headers,
    withCredentials,
    transformRequest,
    ...rest,
  });
};