import { Component, Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'highlightSearch' })
export class HighlightSearch implements PipeTransform {
  transform(text: string, filter: string): string {
    const highlightIndex = text.toLowerCase().indexOf(filter.toLowerCase());
    return highlightIndex < 0
      ? text
      : text.substr(0, highlightIndex) +
          '<b>' +
          text.substr(highlightIndex, filter.length) +
          '</b>' +
          text.substr(highlightIndex + filter.length);
  }
}

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  selected: RadioOption;
  optionList: ReadonlyArray<RadioOption> = [
    { name: 'One' },
    { name: 'Two' },
    { name: 'Three' },
    { name: 'Four' },
  ];
  filteredOptionList: ReadonlyArray<RadioOption> = this.optionList;
  private _filter: string = '';
  get filter(): string {
    return this._filter;
  }

  set filter(value: string) {
    this._filter = value;
    this.filteredOptionList =
      value && value.length > 0
        ? this.optionList.filter(
            option => option.name.toLowerCase().indexOf(value.toLowerCase()) > -1
          )
        : this.optionList;
  }
  allowNull: boolean = false;
  disabled: boolean = false;
  dropdownOpen: boolean = false;
  maxHeight: string = '400px';
  placeholder: string = 'Type to search...';

  selectOption(event: KeyboardEvent, option: RadioOption): void {
    this.selected = option;
    event.preventDefault();
  }

  dropdownOpenChange(value: boolean): void {
    this.dropdownOpen = value;
  }
}

export interface RadioOption {
  name: string;
}