DiunaBI/Frontend/src/app/modules/layers/layers-list/layers-list.component.ts

import { HttpClient } from '@angular/common/http';
import { Component, HostListener, OnInit } from '@angular/core';
import { MatSortModule } from '@angular/material/sort';
import { MatTableModule } from '@angular/material/table';
import { Layer, LayerType } from 'src/app/models/layer.model';
import { MatInputModule } from '@angular/material/input';
import { MatFormFieldModule } from '@angular/material/form-field';
import { RouterLink } from '@angular/router';
import { MatButtonModule } from '@angular/material/button';
import { MatGridListModule } from '@angular/material/grid-list';
import { MatSelectModule } from '@angular/material/select';
import { FormsModule } from '@angular/forms';
import { MatChipsModule} from '@angular/material/chips';
import { MatIconModule } from '@angular/material/icon';
import { NgFor } from '@angular/common';

@Component({
    selector: 'diunabi-layers-list',
    templateUrl: './layers-list.component.html',
    styleUrls: ['./layers-list.component.scss'],
    standalone: true,
    imports: [MatGridListModule, MatButtonModule, RouterLink, MatFormFieldModule, 
      MatInputModule, MatTableModule, MatSortModule, MatSelectModule, FormsModule,
      MatChipsModule, MatIconModule, NgFor]
})
export class LayersListComponent implements OnInit {
  displayedColumns = ['number', 'name', 'type'];
  dataSource!: Layer[];
  LayerType = LayerType;

  start = 0;
  limit = 50;
  end: number = this.limit + this.start;
  loadingInProgress = false;

  type = "";
  codes: string[] = [];

  constructor(
    private _http: HttpClient,
  ) { }

  @HostListener('document:scroll', ['$event'])
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  public async  onScroll(event: any) {
    if (event.target.offsetHeight + event.target.scrollTop >= event.target.scrollHeight - 1 && !this.loadingInProgress) {
      this.loadingInProgress = true;
      this.dataSource = await Layer.getList(this._http, this.start, this.limit, this.codes);
      this.start = this.end;
      this.end = this.limit + this.start;
      setTimeout(() => {
        this.loadingInProgress = false;
      }, 500);
    }
  }
  async ngOnInit() {
    this.dataSource = await Layer.getList(this._http, this.start, this.limit, this.codes);
    this.start = this.end;
    this.end = this.limit + this.start;
  }
  trackByUid(index : number, item : Layer) {
    return item.id;
  }
  async removeCode(code: string) {
    const index = this.codes.indexOf(code);
    if (index >= 0) {
      this.start = 0;
      this.end = this.limit + this.start;
      this.codes.splice(index, 1);
      this.dataSource = await Layer.getList(this._http, this.start, this.limit, this.codes);
    }
  }
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  async addCode(event: any) {
    const value = (event.target.value || '').trim();
    if (value) {
      this.start = 0;
      this.end = this.limit + this.start;
      this.codes.push(value);
      this.dataSource = await Layer.getList(this._http, this.start, this.limit, this.codes);
    }
    event.target.value = '';
  }
}