import { Injectable, Inject } from '@angular/core';
import * as signalR from "@aspnet/signalr";
import { BlockUI, NgBlockUI } from 'ng-block-ui';
import { HttpHeaders, HttpParams, HttpClient } from '@angular/common/http';
import 'rxjs/Rx';
import { BehaviorSubject } from 'rxjs/Rx';
import { AuthService } from '../auth/auth.service';
import { AppConfig } from '../AppConfig/AppConfig';
@Injectable()
export class ConnectionIndicationService {
    connection:signalR.HubConnection;
    connectionisvalid:boolean=true;
    connectionbroken:boolean=false;
    func: Function;
    typestr:string;
    syncserviceUrl:string;
    milisecond:number;
    @BlockUI() blockUI: NgBlockUI;
    public static ConnectionStatusChanged: BehaviorSubject<boolean>;
    intervalfunc:any;
    constructor( private authService: AuthService,
      public http: HttpClient,
      @Inject('syncserviceurl') syncserviceUrl: string)
    {
      this.syncserviceUrl=syncserviceUrl;
      ConnectionIndicationService.ConnectionStatusChanged = new BehaviorSubject<boolean>(true);
    }

ConnectionCheck()
{
  if(this.authService.getUserName!=null)
  {
var optionss = {
  headers: new HttpHeaders({ 'Content-Type':  'application/json','Authorization': this.authService.getAuthorizationHeaderValue() }),
  params:new HttpParams()
};

  this.http.get<any>(this.syncserviceUrl+"api/Notification", optionss).subscribe(res=>{
   
  //  alert(JSON.stringify(res));
    if(JSON.stringify(res) == "true")
    {
      clearInterval(this.intervalfunc);
      this.start();
      this.on(this.func,this.typestr);
      // this.blockUI.stop();
      ConnectionIndicationService.ConnectionStatusChanged.next(true);
    }
 
});
}
}


  build()
  {
  
    this.connection = new signalR.HubConnectionBuilder()
        .withUrl(AppConfig.settings.syncserviceurl+"NotificationHub",
      {  accessTokenFactory: () => 
      
       this.authService.getAccessToken()
    })
        .build();
        
        //  this.connection = new signalR.HubConnectionBuilder()
        // .withUrl(AppConfig.settings.syncserviceurl+"NotificationHub", signalR.HttpTransportType.WebSockets)
        // .build();
        this.connection.serverTimeoutInMilliseconds=3600000;
        ConnectionIndicationService.ConnectionStatusChanged.next(false);
        this.connection.onclose((e)=>{
          // this.blockUI.start('Reconnecting...');
          console.log('Reconnecting...');
          this.intervalfunc =setInterval(() => {
            this.ConnectionCheck(); 
          }, 5000);
          // this.connectionisvalid=false;
          this.stop();
        });

        return this.connection;
  }

on(func: Function,typestr:string)
{
  this.func=func;
  this.typestr=typestr;
    this.connection.on("Random", data => {
        });

       
}

start()
{
    this.connection.start().then(() => {
      console.log('Hub connection started');
  }).catch(err=>{
      //  alert('Error while establishing connection');
  });


}

off()
{
  this.connection.off("Random");

}
  stop()
  {

    this.connection.stop().then(()=>{

    
    }).catch(function (err) {
      alert('Error while establishing connection');
  });
   
  }
}