import { ComponentType } from '@angular/core/src/render3';
import { Injectable, Injector, TemplateRef } from '@angular/core';

import { DialogComponent } from '../components';
import { DomService } from '../../../shared/dom/dom.service';
import { extendObject } from '../../../shared/util/object-extend';
import { PortalInjector } from '../../../shared/portal/portal-injector';

@Injectable()
export class DialogService {
    constructor(
        private injector: Injector,
        private domService: DomService,
    ) {}

    public open<T>(componentOrTemplateRef: ComponentType<T> | any | TemplateRef<T>, config: any): any {
        config = { ...{ hasBackdrop: true }, ...config };

        const componentRef = this.getComponentRef(config);

        (componentRef.instance as any)._setComponent(componentOrTemplateRef);

        return componentRef.instance as DialogComponent<T>;
    }

    private getComponentRef(config: any) {
        const injectionTokens = new WeakMap();

        injectionTokens.set(DialogComponent, DialogComponent);

        const injector = new PortalInjector(this.injector, injectionTokens);

        const componentRef = this.domService.attachComponentPortal(DialogComponent, injector);

        (componentRef.instance as any).config = extendObject({}, config);

        (componentRef.instance as any).afterClosed().subscribe(() => {
            componentRef.destroy();
        });

        return componentRef;
    }
}