import { setOriginalUrl } from './stateMap'

export default class EventClient {
  private source : EventSource | undefined = undefined
  private readonly signinUrl: string
  constructor(signinUrl: string) {
    this.signinUrl = signinUrl
    this.source = new EventSource((import.meta.env.BASE_URL || '/') + 'sse')
    this.source.onmessage = (e: MessageEvent) => {
      this.handleMsg(JSON.parse(e.data))
    }
    this.source.onerror = () => {
      this.source?.close()
      this.source = undefined
      console.warn('SSE 连接关闭或出错')
    }
  }

  close() {
    this.source?.close()
    this.source = undefined
  }

  handleMsg(data: any) {
    if(data.type === 'command' && data.value === 'Re-login') {
      // 跳转前，保存原始地址
      const urlParam = new URLSearchParams(this.signinUrl)
      const state = urlParam.get('state')
      if (state) {
        setOriginalUrl(state, window.location.href)
      }
      
      // 重新登录，跳转到登录页面
      window.location.href = this.signinUrl.replace(/^https?:\/\/[^/]+/, '')
    }
  }
}