/**
 * Copyright (C) 2018 The Android Open Source Project
 *
 * 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, EventEmitter, HostBinding, HostListener, Input, Output, TemplateRef, ViewContainerRef} from '@angular/core';


@Directive({
  selector: '[appCdkDetailRow]'
})
export class CdkDetailRowDirective {
  private row: any;
  private tRef: TemplateRef<any>;
  private opened: boolean;

  @HostBinding('class.expanded')
  get expended(): boolean {
    return this.opened;
  }

  @Input()
  set appCdkDetailRow(value: any) {
    if (value !== this.row) {
      this.row = value;
      // this.render();
    }
  }

  @Input('appCdkDetailRowTpl')
  set template(value: TemplateRef<any>) {
    if (value !== this.tRef) {
      this.tRef = value;
    }
  }

  @Output() toggleChange = new EventEmitter<CdkDetailRowDirective>();

  constructor(public vcRef: ViewContainerRef) { }

  @HostListener('click')
  onClick(): void {
    this.toggle();
  }

  toggle(): void {
    if (this.opened) {
      this.vcRef.clear();
    } else {
      this.render();
    }
    this.opened = this.vcRef.length > 0;
    this.toggleChange.emit(this);
  }

  private render(): void {
    this.vcRef.clear();
    if (this.tRef && this.row) {
      this.vcRef.createEmbeddedView(this.tRef, { $implicit: this.row });
    }
  }
}