import { get } from './request'

export class OneRequest {
  request: () => Promise<any>;
  loading: boolean;
  done: boolean;
  res: any;
  callbacks: Array<{
    resolve: (data: any) => void,
    reject: (err: any) => void
  }> = [];

  constructor(request: () => Promise<any>) {
    this.request = request
  }

  async fetch() {
    this.loading = true
    try {
      this.res = await this.request()
      // 通知 res 请求完毕
      this.syncRes(this.res, 'resolve')
      this.done = true
    } catch(err) {
      this.syncRes(err, 'reject')
    }
    this.loading = false
    return this.res
  }

  syncRes(data: any, type: 'resolve' | 'reject') {
    this.callbacks.forEach((callback) => {
      callback[type](data)
    })
  }

  async oneFetch() {
    if (this.done) {
      return this.res
    }
    if (this.loading) {
      return new Promise((resolve, reject) => {
        this.callbacks.push({
          resolve,
          reject
        })
      })
    }
    return await this.fetch()
  }
}

export const onBlogInfoRequest = new OneRequest(
  () => {
    return get('//www.lofter.com/loginCheck.do')
  }
)

class templateActivityRequest {

  public oneInstance: {
    [key: string]: OneRequest
  } = {}

  getOneInstance(activityId: string) {
    if (this.oneInstance[activityId]) {
      return this.oneInstance[activityId]
    }
    let instance = new OneRequest(
      () => {
        return get(`//www.lofter.com/spread/common/getInfo.json?name=${activityId}`)
      }
    )
    this.oneInstance[activityId] = instance
    return instance
  }
}

const templateActivityRequestIns = new templateActivityRequest()

export const oneTemplateActivityRequest = (activityId: string) => {
  return templateActivityRequestIns.getOneInstance(activityId)
}