import { ChangeDetectionStrategy, ChangeDetectorRef, Component, Input, OnDestroy, OnInit } from '@angular/core';
import { takeUntil } from 'rxjs/operators';
import { Subject } from 'rxjs';
import { TreoHorizontalNavigationComponent } from '@treo/components/navigation/horizontal/horizontal.component';
import { TreoNavigationService } from '@treo/components/navigation/navigation.service';
import { TreoNavigationItem } from '@treo/components/navigation/navigation.types';

@Component({
    selector       : 'treo-horizontal-navigation-spacer-item',
    templateUrl    : './spacer.component.html',
    styles         : [],
    changeDetection: ChangeDetectionStrategy.OnPush
})
export class TreoHorizontalNavigationSpacerItemComponent implements OnInit, OnDestroy
{
    // Item
    @Input()
    item: TreoNavigationItem;

    // Name
    @Input()
    name: string;

    // Private
    private _treoHorizontalNavigationComponent: TreoHorizontalNavigationComponent;
    private _unsubscribeAll: Subject<void>;

    /**
     * Constructor
     *
     * @param {TreoNavigationService} _treoNavigationService
     * @param {ChangeDetectorRef} _changeDetectorRef
     */
    constructor(
        private _treoNavigationService: TreoNavigationService,
        private _changeDetectorRef: ChangeDetectorRef
    )
    {
        // Set the private defaults
        this._unsubscribeAll = new Subject();
    }

    // -----------------------------------------------------------------------------------------------------
    // @ Lifecycle hooks
    // -----------------------------------------------------------------------------------------------------

    /**
     * On init
     */
    ngOnInit(): void
    {
        // Get the parent navigation component
        this._treoHorizontalNavigationComponent = this._treoNavigationService.getComponent(this.name);

        // Subscribe to onRefreshed on the navigation component
        this._treoHorizontalNavigationComponent.onRefreshed.pipe(
            takeUntil(this._unsubscribeAll)
        ).subscribe(() => {

            // Mark for check
            this._changeDetectorRef.markForCheck();
        });
    }

    /**
     * On destroy
     */
    ngOnDestroy(): void
    {
        // Unsubscribe from all subscriptions
        this._unsubscribeAll.next();
        this._unsubscribeAll.complete();
    }
}