import qs from 'qs'
import { AjaxInstance, AnyObj, ProxyedAttrs } from './types'

/**
 * 标准化config配置，或根据配置项设置相关的参数
 * 该函数返回的配置对象，应该完全符合axios的配置规范
 * @param {*} config
 */
export function normalizeConfig(ctx: AjaxInstance, config) {
  const {
    headers = {}, sendFormData = false, data = undefined, params = {}, baseUrl = '', baseURL = '', ...rest
  } = { ...ctx.$options, ...config };
  // 数据格式为FormData，修改content-type头，以及修改data格式
  const contentType = headers['content-type'] || headers['Content-Type'] || 'application/json';
  headers['content-type'] = sendFormData ? 'application/x-www-form-urlencoded' : contentType;
  const sendData = sendFormData && typeof data === 'object' && data !== null ? qs.stringify(data) : data;

  // baseUrl，支持两种写法，且用户配置的baseUrl优先级最高
  const bUrl = baseUrl || baseURL || ctx.$baseUrl;

  return {
    headers, params, data: sendData, baseURL: bUrl, ...rest,
  };
}

export function addInstanceExtendMethod(ctx) {
  const extend = (source: AnyObj) => {
    Object.keys(source).forEach((key) => {
      ctx[key] = source[key];
    });
  };
  ctx.extend = extend;
}

export function proxyAxiosMethods<S extends {[K in ProxyedAttrs]: any}>(target: AnyObj, source: S): void {
  const methods: ProxyedAttrs[] = ['request', 'interceptors'];
  // const methods: ProxyedAttrs[] = ['request', 'get', 'post', 'delete', 'head', 'options', 'put', 'patch', 'interceptors'];

  methods.forEach((method) => {
    Object.defineProperty(target, method, {
      value: source[method],
      writable: false,
    });
  });
}