import {Component, ContentChildren, ElementRef, Input, OnChanges, QueryList, ViewChild,} from '@angular/core';
import {HFormService} from '../../services/h-form.service';
import {JsfElement} from '../../superclass/jsf-element';
import {FFacetComponent} from '../f-facet/f-facet.component';

@Component({
    selector: 'ice-panel-popup',
    templateUrl: './ice-panel-popup.component.html',
    styleUrls: ['./ice-panel-popup.component.css'],
})
export class IcePanelPopupComponent extends JsfElement implements OnChanges {
    @Input()
    visible: boolean;
    @Input()
    draggable: boolean;
    @Input()
    autoCentre: boolean;

    @ViewChild('popup')
    popup: ElementRef;

    private height: number;
    private width: number;

    @ContentChildren(FFacetComponent)
    private facets: QueryList<FFacetComponent>;

    constructor(hFormService: HFormService, elementRef: ElementRef) {
        super(hFormService, elementRef);

        this.style = {
            position: 'absolute',
            display: 'none',
        };
    }

    get body(): FFacetComponent {
        for (const facet of this.facets.toArray()) {
            if (facet.name === 'body') {
                return facet;
            }
        }
        return null;
    }

    ngOnChanges() {
        const self = this;

        // we have to use timeout here, as an update in view init is not allowed
        // and we have to manipulate the position after we know the dimensions of the div
        setTimeout(() => {
            // first show the element so the browser calc its height and width
            self.style.display = self.visible ? 'block' : 'none';
            setTimeout(() => {
                // now the element is visible and we can set its position
                self.width = self.popup.nativeElement.offsetWidth;
                self.height = self.popup.nativeElement.offsetHeight;
                self.style.left = `${self.width ?
                    window.innerWidth / 2 - (self.width / 2) :
                    0}px`;
                self.style.top = `${self.height ?
                    window.innerHeight / 2 - (self.height / 2) :
                    0}px`;
            });
        }, 0);
    }
}