import {
  Component,
  Input
} from '@angular/core';
import {
  trigger,
  state,
  style,
  animate,
  transition
} from '@angular/animations';

import { Hero } from './hero.service';

@Component({
  selector: 'app-hero-list-enter-leave-states',
  // #docregion template
  template: `
    <ul>
      <li *ngFor="let hero of heroes"
          (click)="hero.toggleState()"
          [@heroState]="hero.state">
        {{hero.name}}
      </li>
    </ul>
  `,
  // #enddocregion template
  styleUrls: ['./hero-list.component.css'],
  /* The elements here have two possible states based
   * on the hero state, "active", or "inactive". We animate
   * six transitions: Between the two states in both directions,
   * and between each state and void. With this we can animate
   * the enter and leave of elements differently based on which
   * state they are in when they are added and removed.
   */
  // #docregion animationdef
  animations: [
    trigger('heroState', [
      state('inactive', style({transform: 'translateX(0) scale(1)'})),
      state('active',   style({transform: 'translateX(0) scale(1.1)'})),
      transition('inactive => active', animate('100ms ease-in')),
      transition('active => inactive', animate('100ms ease-out')),
      transition('void => inactive', [
        style({transform: 'translateX(-100%) scale(1)'}),
        animate(100)
      ]),
      transition('inactive => void', [
        animate(100, style({transform: 'translateX(100%) scale(1)'}))
      ]),
      transition('void => active', [
        style({transform: 'translateX(0) scale(0)'}),
        animate(200)
      ]),
      transition('active => void', [
        animate(200, style({transform: 'translateX(0) scale(0)'}))
      ])
    ])
  ]
  // #enddocregion animationdef
})
export class HeroListEnterLeaveStatesComponent {
   @Input() heroes: Hero[];
}