import { Api, Apis, SyncFnMap, WebApiConfig, WxApiConfig } from './interfaces';
import {
  map,
  pipe,
  filter,
  values,
  flatten,
  mergeAll,
} from './utils';

/**
 * 将各个发起 api 的函数的 key 与其绑定，与 TuaStorage 配合使用效果更佳
 * apis: { api1: apiMap1, api2: apiMap2 }
 * apiMap: {
 *  path1: { [Function: path1] key: key1 },
 *  path2: { [Function: path2] key: key2 },
 *  ...
 * }
 *
 * 转换成 {
 *  key1: [Function: path1] key: key1,
 *  key2: [Function: path2] key: key2,
 *  ...
 * }
 * @param {object} apis
 * @return {object}
 */
export const getSyncFnMapByApis = (apis: Apis): SyncFnMap => pipe(
  values,
  map(values),
  flatten,
  map(val => ({ [val.key]: val })),
  mergeAll,
)(apis);

/**
 * 过滤出有默认参数的接口（接口参数非数组，且不含有 isRequired/required）
 * @param {object} syncFnMap
 * @return {Array} keys 所有有默认参数的接口名称
 */
export const getPreFetchFnKeysBySyncFnMap = (syncFnMap: SyncFnMap): Api[] => pipe(
  Object.keys,
  filter((key) => {
    const { params } = syncFnMap[key];

    if (Array.isArray(params)) return false;

    // 当前参数不是必须的
    const isParamNotRequired = key => (
      typeof params[key] !== 'object'
      // 兼容 vue 的写法
      || (!params[key].isRequired && !params[key].required)
    );

    return Object.keys(params).every(isParamNotRequired);
  }),
  map(key => ({ key })),
)(syncFnMap);

/**
 * Define an api config for Wx.
 *
 * @param config WxApiConfig.
 * @returns WxApiConfig.
 */
export const defineWxApi = (config: WxApiConfig): WxApiConfig => config;

/**
 * Define an api config for Web.
 *
 * @param config WebApiConfig.
 * @returns WebApiConfig.
 */
export const defineWebApi = (config: WebApiConfig): WebApiConfig => config;