/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import '@angular/core/test/bundling/util/src/reflect_metadata';

import {CommonModule} from '@angular/common';
import {Component, Directive, ElementRef, HostBinding, NgModule, ɵPlayState as PlayState, ɵPlayer as Player, ɵPlayerHandler as PlayerHandler, ɵaddPlayer as addPlayer, ɵbindPlayerFactory as bindPlayerFactory, ɵmarkDirty as markDirty, ɵrenderComponent as renderComponent} from '@angular/core';

@Directive({
  selector: '[make-color-grey]',
  exportAs: 'makeColorGrey',
  host: {'style': 'font-family: Times New Roman;'}
})
class MakeColorGreyDirective {
  @HostBinding('style.background-color') private _backgroundColor: string|null = null;
  @HostBinding('style.color') private _textColor: string|null = null;

  on() {
    this._backgroundColor = 'grey';
    this._textColor = 'black';
  }

  off() {
    this._backgroundColor = null;
    this._textColor = null;
  }

  toggle() { this._backgroundColor ? this.off() : this.on(); }
}

@Component({
  selector: 'animation-world',
  template: `
    <nav>
      <button (click)="animateWithCustomPlayer()">Animate List (custom player)</button>
      <button (click)="animateWithStyles()">Populate List (style bindings)</button>
    </nav>
    <div class="list">
      <div
        #makeColorGrey="makeColorGrey"
        make-color-grey
        *ngFor="let item of items"
        class="record"
        [style.transform]="item.active ? 'scale(1.5)' : 'none'"
        [class]="makeClass(item)"
        style="border-radius: 10px" 
        [style]="styles"
        [style.color]="item.value == 4 ? 'red' : null"
        [style.background-color]="item.value == 4 ? 'white' : null"
        (click)="toggleActive(item, makeColorGrey)">
        {{ item.value }}
      </div>
    </div>
  `,
})
class AnimationWorldComponent {
  items: any[] = [
    {value: 1, active: false}, {value: 2, active: false}, {value: 3, active: false},
    {value: 4, active: false}, {value: 5, active: false}, {value: 6, active: false},
    {value: 7, active: false}, {value: 8, active: false}, {value: 9, active: false}
  ];
  private _hostElement: HTMLElement;
  public styles: {[key: string]: any}|null = null;

  constructor(element: ElementRef) { this._hostElement = element.nativeElement; }

  makeClass(item: any) { return `record-${item.value}`; }

  toggleActive(item: any, makeColorGrey: MakeColorGreyDirective) {
    item.active = !item.active;
    makeColorGrey.toggle();
    markDirty(this);
  }

  animateWithStyles() {
    this.styles = animateStyleFactory([{opacity: 0}, {opacity: 1}], 300, 'ease-out');
    markDirty(this);
  }

  animateWithCustomPlayer() {
    const elements = this._hostElement.querySelectorAll('div.record') as any as HTMLElement[];
    for (let i = 0; i < elements.length; i++) {
      const element = elements[i];
      const delay = i * 100;
      const player = buildAnimationPlayer(element, 'fadeInOut', `500ms ease-out ${delay}ms both`);
      addPlayer(element, player);
    }
  }
}

@NgModule(
    {declarations: [AnimationWorldComponent, MakeColorGreyDirective], imports: [CommonModule]})
class AnimationWorldModule {
}


function buildAnimationPlayer(element: HTMLElement, animationName: string, time: string): Player {
  return new SimpleKeyframePlayer(element, animationName, time);
}

class SimpleKeyframePlayer implements Player {
  state = PlayState.Pending;
  parent: Player|null = null;
  private _animationStyle: string = '';
  private _listeners: {[stateName: string]: (() => any)[]} = {};
  constructor(private _element: HTMLElement, private _animationName: string, time: string) {
    this._animationStyle = `${time} ${_animationName}`;
  }
  private _start() {
    (this._element as any).style.animation = this._animationStyle;
    const animationFn = (event: AnimationEvent) => {
      if (event.animationName == this._animationName) {
        this._element.removeEventListener('animationend', animationFn);
        this.finish();
      }
    };
    this._element.addEventListener('animationend', animationFn);
  }
  addEventListener(state: PlayState|string, cb: () => any): void {
    const key = state.toString();
    const arr = this._listeners[key] = (this._listeners[key] || []);
    arr.push(cb);
  }
  play(): void {
    if (this.state <= PlayState.Pending) {
      this._start();
    }
    if (this.state != PlayState.Running) {
      setAnimationPlayState(this._element, 'running');
      this.state = PlayState.Running;
      this._emit(this.state);
    }
  }
  pause(): void {
    if (this.state != PlayState.Paused) {
      setAnimationPlayState(this._element, 'paused');
      this.state = PlayState.Paused;
      this._emit(this.state);
    }
  }
  finish(): void {
    if (this.state < PlayState.Finished) {
      this._element.style.animation = '';
      this.state = PlayState.Finished;
      this._emit(this.state);
    }
  }
  destroy(): void {
    if (this.state < PlayState.Destroyed) {
      this.finish();
      this.state = PlayState.Destroyed;
      this._emit(this.state);
    }
  }
  capture(): any {}
  private _emit(state: PlayState) {
    const arr = this._listeners[state.toString()] || [];
    arr.forEach(cb => cb());
  }
}

function setAnimationPlayState(element: HTMLElement, state: string) {
  element.style.animationPlayState = state;
}

class AnimationDebugger implements PlayerHandler {
  private _players: Player[] = [];

  flushPlayers() {
    this._players.forEach(player => {
      if (!player.parent) {
        player.play();
      }
    });
    this._players.length = 0;
  }

  queuePlayer(player: Player): void { this._players.push(player); }
}

const playerHandler = new AnimationDebugger();
renderComponent(AnimationWorldComponent, {playerHandler});

function animateStyleFactory(keyframes: any[], duration: number, easing: string) {
  const limit = keyframes.length - 1;
  const finalKeyframe = keyframes[limit];
  return bindPlayerFactory(
      (element: HTMLElement, type: number, values: {[key: string]: any},
       isFirstRender: boolean) => {
        const kf = keyframes.slice(0, limit);
        kf.push(values);
        return new WebAnimationsPlayer(element, keyframes, duration, easing);
      },
      finalKeyframe);
}

class WebAnimationsPlayer implements Player {
  state = PlayState.Pending;
  parent: Player|null = null;
  private _listeners: {[stateName: string]: (() => any)[]} = {};
  constructor(
      private _element: HTMLElement, private _keyframes: {[key: string]: any}[],
      private _duration: number, private _easing: string) {}
  private _start() {
    const player = this._element.animate(
        this._keyframes as any[], {duration: this._duration, easing: this._easing, fill: 'both'});
    player.addEventListener('finish', e => { this.finish(); });
  }
  addEventListener(state: PlayState|string, cb: () => any): void {
    const key = state.toString();
    const arr = this._listeners[key] = (this._listeners[key] || []);
    arr.push(cb);
  }
  play(): void {
    if (this.state <= PlayState.Pending) {
      this._start();
    }
    if (this.state != PlayState.Running) {
      this.state = PlayState.Running;
      this._emit(this.state);
    }
  }
  pause(): void {
    if (this.state != PlayState.Paused) {
      this.state = PlayState.Paused;
      this._emit(this.state);
    }
  }
  finish(): void {
    if (this.state < PlayState.Finished) {
      this._element.style.animation = '';
      this.state = PlayState.Finished;
      this._emit(this.state);
    }
  }
  destroy(): void {
    if (this.state < PlayState.Destroyed) {
      this.finish();
      this.state = PlayState.Destroyed;
      this._emit(this.state);
    }
  }
  capture(): any {}
  private _emit(state: PlayState) {
    const arr = this._listeners[state.toString()] || [];
    arr.forEach(cb => cb());
  }
}
