import { EventEmitter } from 'events'
import { loginStatus } from './routes'
import { AuthTicket, Fetcher, LoginStatusChecker } from '@skolplattformen/api'

export class Checker extends EventEmitter implements LoginStatusChecker {
  public token: string

  private fetcher: Fetcher

  private url: string

  private cancelled = false

  constructor(fetcher: Fetcher, ticket: AuthTicket) {
    super()
    this.fetcher = fetcher
    this.url = loginStatus(ticket.order)
    this.token = ticket.token
    this.check()
  }

  async check(): Promise<void> {
    const response = await this.fetcher('login-status', this.url)
    const status = await response.text()
    this.emit(status)
    if (
      !this.cancelled &&
      status !== 'OK' &&
      status !== 'ERROR!' &&
      status !== 'CANCELLED'
    ) {
      setTimeout(() => this.check(), 1000)
    }
  }

  async cancel(): Promise<void> {
    this.cancelled = true
  }
}

export const checkStatus = (
  fetch: Fetcher,
  ticket: AuthTicket
): LoginStatusChecker => new Checker(fetch, ticket)

export class DummyStatusChecker
  extends EventEmitter
  implements LoginStatusChecker
{
  token = ''
  async cancel(): Promise<void> {
    // do nothing
  }
}