import { ChangeDetectionStrategy, Component,ChangeDetectorRef } from '@angular/core';
import { DumpDataService } from '../../../shared/services/dumpdata';

import * as json from './datatablelazydemo-dataproperties.json';
import * as jsonEvents from './datatablelazydemo-dataevents.json';

@Component( {
  selector: 'app-datatable-lazy',
  templateUrl: './datatablelazydemo.component.html',
 // changeDetection: ChangeDetectionStrategy.OnPush,
  styleUrls: [ './datatablelazydemo.component.scss' ],
  providers: [DumpDataService]
} )
export class DataTableLazyDemo {

  public data: Array<any>;

  public dataLazy: any;

  public rowSelected: any;

  private take = 200;

  private dataTableProperties;

  private dataTableEvents;

  private timeout ;

  constructor(private dumpDataService: DumpDataService, private cd : ChangeDetectorRef) {
    this.dataTableProperties = json.dataProperties;
    this.dataTableEvents = jsonEvents.dataProperties;

    this.data = this.dumpDataService.createRandomData(1000000);

    this.dataLazy = {
      "data" : this.getDataFromService(0,this.take),
      "total" : this.data.length
    }
  }

  getDataFromService(skip, take) {

      return this.data.slice(skip, take);

  }

  onLazyLoad(event){
    clearTimeout(this.timeout );
    this.timeout = setTimeout(()=>{
      this.dataLazy = {
          "data" : this.getDataFromService(event.skip,event.take),
          "total" : this.data.length
        };
    },2000)
  }

  onPageChange(event){
   // console.log(event);
  }

  onRowSelect( row ) {
    this.rowSelected = row;
  }

}