///
/// Copyright 2015-2026 Micro Focus or one of its affiliates.
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///      http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///

import {
  Directive,
  ElementRef,
  HostBinding,
  HostListener,
  inject,
  Input,
  OnDestroy,
  OnInit,
} from '@angular/core';
import { Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { ManagedFocusContainerService } from '../accessibility/managed-focus-container/managed-focus-container.service';
import { HoverActionService } from './hover-action.service';

@Directive({
  selector: '[uxHoverActionContainer]',
  providers: [HoverActionService],
})
export class HoverActionContainerDirective implements OnInit, OnDestroy {
  private readonly _elementRef = inject(ElementRef);

  private readonly _managedFocusContainerService = inject(ManagedFocusContainerService);

  private readonly _hoverActionService = inject(HoverActionService);

  @Input()
  @HostBinding('tabindex')
  tabindex: number = 0;

  @HostBinding('class.hover-action-container-active')
  active: boolean = false;

  private readonly _onDestroy = new Subject<void>();

  ngOnInit(): void {
    // Watch for focus within the container element and manage tabindex of descendants
    this._managedFocusContainerService.register(this._elementRef.nativeElement, this);

    // Track focus and update state for the child directives
    this._managedFocusContainerService
      .hasFocus(this._elementRef.nativeElement)
      .pipe(takeUntil(this._onDestroy))
      .subscribe(active => {
        this.active = active;
        this._hoverActionService.setFocusState(active);
      });
  }

  ngOnDestroy(): void {
    this._onDestroy.next();
    this._onDestroy.complete();

    this._managedFocusContainerService.unregister(this._elementRef.nativeElement, this);
  }

  @HostListener('mouseenter') onHover(): void {
    this._hoverActionService.setHoverState(true);
  }

  @HostListener('mouseleave') onLeave(): void {
    this._hoverActionService.setHoverState(false);
  }
}