import { Injectable, SkipSelf, Optional } from '@angular/core';
import { Subject, BehaviorSubject } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class FarrisSubMenuService {


  /* menuItem层级  用于计算paddingLeft */
  public level$ = new BehaviorSubject<number>(1);

  /* submenu展开 */
  public open$ = new Subject<boolean>();

  /* 谁的子元素 */
  public isChildofSub$ = new Subject<boolean>();

  /* 谁的子元素 */
  level = 1;

  /* Todo  paddingLeft使用 */
  constructor(
    @SkipSelf() @Optional() private hostSubmenuService: FarrisSubMenuService,
  ) {
    if (this.hostSubmenuService) {
      this.setLevel(this.hostSubmenuService.level + 1);
    }
  }

  setLevel(value: number) {
    this.level = value;
    // this.level$.next(value);
  }


  pipeLevel() {
    this.level$.next(this.level);
  }



}