import {AfterViewInit, Component, ElementRef, OnInit, ViewChild} from '@angular/core';
import {MatPaginator, MatSort} from '@angular/material';
import {AccountListDataSource} from './account-list-datasource';
import {Account} from '../account';
import {ActivatedRoute} from '@angular/router';
import {Observable} from 'rxjs';
import {FormBuilder, FormGroup} from '@angular/forms';
import {debounceTime, distinctUntilChanged, startWith} from 'rxjs/operators';

@Component({
  selector: 'app-account-list',
  templateUrl: './account-list.component.html',
  styleUrls: ['./account-list.component.css']
})
export class AccountListComponent implements OnInit, AfterViewInit {
  @ViewChild('filterElement') filterElement: ElementRef;
  @ViewChild(MatPaginator) paginator: MatPaginator;
  @ViewChild(MatSort) sort: MatSort;
  dataSource: AccountListDataSource;
  filter: Observable<string>;
  form: FormGroup;
  list: Account[];

  /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
  displayedColumns = ['name', 'type', 'isActive', 'isReconcilable', 'costCentre'];

  constructor(private route: ActivatedRoute, private fb: FormBuilder) {
    this.createForm();
    this.filter = this.listenToFilterChange();
  }

  createForm() {
    this.form = this.fb.group({
      filter: ''
    });
  }

  listenToFilterChange() {
    return this.form.get('filter').valueChanges
      .pipe(
        startWith(''),
        debounceTime(150),
        distinctUntilChanged()
      );
  }

  ngOnInit() {
    this.route.data
      .subscribe((data: { list: Account[] }) => {
        this.list = data.list;
      });
    this.dataSource = new AccountListDataSource(this.paginator, this.sort, this.filter, this.list);
  }

  ngAfterViewInit() {
    setTimeout(() => {
      this.filterElement.nativeElement.focus();
    }, 0);
  }
}