/**
 * @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 {animate, group, keyframes, query, state, style, transition, trigger} from '@angular/animations';
import {AnimationDriver, ɵAnimationEngine as AnimationEngine, ɵCssKeyframesDriver as CssKeyframesDriver, ɵCssKeyframesPlayer as CssKeyframesPlayer} from '@angular/animations/browser';
import {AnimationGroupPlayer} from '@angular/animations/src/players/animation_group_player';
import {Component, ViewChild} from '@angular/core';
import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
import {browserDetection} from '@angular/platform-browser/testing/src/browser_util';

import {TestBed} from '../../testing';

(function() {
  // these tests are only mean't to be run within the DOM (for now)
  // Buggy in Chromium 39, see https://github.com/angular/angular/issues/15793
  if (isNode) return;

  describe('animation integration tests using css keyframe animations', function() {

    beforeEach(() => {
      TestBed.configureTestingModule({
        providers: [{provide: AnimationDriver, useClass: CssKeyframesDriver}],
        imports: [BrowserAnimationsModule]
      });
    });

    it('should compute (*) animation styles for a container that is being removed', () => {
      @Component({
        selector: 'ani-cmp',
        template: `
          <div @auto *ngIf="exp">
            <div style="line-height:20px;">1</div>
            <div style="line-height:20px;">2</div>
            <div style="line-height:20px;">3</div>
            <div style="line-height:20px;">4</div>
            <div style="line-height:20px;">5</div>
          </div>
        `,
        animations: [trigger(
            'auto',
            [
              state('void', style({height: '0px'})),
              state('*', style({height: '*'})),
              transition('* => *', animate(1000)),
            ])]
      })
      class Cmp {
        public exp: boolean = false;
      }

      TestBed.configureTestingModule({declarations: [Cmp]});

      const engine = TestBed.get(AnimationEngine);
      const fixture = TestBed.createComponent(Cmp);
      const cmp = fixture.componentInstance;

      cmp.exp = true;
      fixture.detectChanges();

      expect(engine.players.length).toEqual(1);
      let player = getPlayer(engine) as CssKeyframesPlayer;
      expect(player.keyframes).toEqual([{height: '0px', offset: 0}, {height: '100px', offset: 1}]);

      player.finish();
      if (browserDetection.isOldChrome) return;

      cmp.exp = false;
      fixture.detectChanges();

      player = getPlayer(engine) as CssKeyframesPlayer;
      expect(player.keyframes).toEqual([{height: '100px', offset: 0}, {height: '0px', offset: 1}]);
    });

    it('should cleanup all existing @keyframe <style> objects after the animation has finished',
       () => {
         @Component({
           selector: 'ani-cmp',
           template: `
          <div [@myAnimation]="myAnimationExp">
            <div>1</div>
            <div>2</div>
            <div>3</div>
            <div>4</div>
            <div>5</div>
          </div>
        `,
           animations: [trigger(
               'myAnimation',
               [
                 transition(
                     '* => go',
                     [
                       query(
                           'div',
                           [
                             style({opacity: 0}),
                             animate('1s', style({opacity: 0})),
                           ]),
                     ]),
               ])]
         })
         class Cmp {
           public myAnimationExp = '';
         }

         TestBed.configureTestingModule({declarations: [Cmp]});

         const engine = TestBed.get(AnimationEngine);
         const fixture = TestBed.createComponent(Cmp);
         const cmp = fixture.componentInstance;

         cmp.myAnimationExp = 'go';
         fixture.detectChanges();

         const webPlayer = <AnimationGroupPlayer>getPlayer(engine);
         const players = webPlayer.players as CssKeyframesPlayer[];
         expect(players.length).toEqual(5);

         const head = document.querySelector('head') !;
         const sheets: any[] = [];
         for (let i = 0; i < 5; i++) {
           const sheet = findStyleObjectWithKeyframes(i);
           expect(head.contains(sheet)).toBeTruthy();
           sheets.push(sheet);
         }

         cmp.myAnimationExp = 'go-back';
         fixture.detectChanges();

         for (let i = 0; i < 5; i++) {
           expect(head.contains(sheets[i])).toBeFalsy();
         }
       });

    it('should properly handle easing values that are apart of the sequence', () => {
      @Component({
        selector: 'ani-cmp',
        template: `
          <div #elm [@myAnimation]="myAnimationExp"></div>
        `,
        animations: [
          trigger(
              'myAnimation',
              [
                transition(
                    '* => goSteps',
                    [
                      style({opacity: 0}),
                      animate('1s ease-out', style({opacity: 1})),
                    ]),
                transition(
                    '* => goKeyframes',
                    [
                      animate('1s cubic-bezier(0.5, 1, 0.5, 1)', keyframes([
                                style({opacity: 0}),
                                style({opacity: 0.5}),
                                style({opacity: 1}),
                              ])),
                    ]),
              ]),
        ]
      })
      class Cmp {
        @ViewChild('elm') public element: any;

        public myAnimationExp = '';
      }

      TestBed.configureTestingModule({declarations: [Cmp]});

      const engine = TestBed.get(AnimationEngine);
      const fixture = TestBed.createComponent(Cmp);
      const cmp = fixture.componentInstance;

      cmp.myAnimationExp = 'goSteps';
      fixture.detectChanges();

      let kfElm = findStyleObjectWithKeyframes();
      const [r1, r2] = kfElm.sheet.cssRules[0].cssRules;
      assertEasing(r1, 'ease-out');
      assertEasing(r2, '');

      const element = cmp.element.nativeElement;

      const webPlayer = getPlayer(engine);
      cmp.myAnimationExp = 'goKeyframes';
      fixture.detectChanges();

      assertEasing(element, 'cubic-bezier(0.5,1,0.5,1)');
    });

    it('should restore existing style values once the animation completes', () => {
      @Component({
        selector: 'ani-cmp',
        template: `
          <div #elm [@myAnimation]="myAnimationExp"></div>
        `,
        animations: [
          trigger(
              'myAnimation',
              [
                state('go', style({width: '200px'})),
                transition(
                    '* => go',
                    [
                      style({height: '100px', width: '100px'}), group([
                        animate('1s', style({height: '200px'})),
                        animate('1s', style({width: '200px'}))
                      ])
                    ]),
              ]),
        ]
      })
      class Cmp {
        @ViewChild('elm') public element: any;

        public myAnimationExp = '';
      }

      TestBed.configureTestingModule({declarations: [Cmp]});

      const engine = TestBed.get(AnimationEngine);
      const fixture = TestBed.createComponent(Cmp);
      const cmp = fixture.componentInstance;

      fixture.detectChanges();
      const element = cmp.element.nativeElement;
      element.style['width'] = '50px';
      element.style['height'] = '50px';

      assertStyle(element, 'width', '50px');
      assertStyle(element, 'height', '50px');

      cmp.myAnimationExp = 'go';
      fixture.detectChanges();

      const player = getPlayer(engine);

      assertStyle(element, 'width', '100px');
      assertStyle(element, 'height', '100px');

      player.finish();

      assertStyle(element, 'width', '200px');
      assertStyle(element, 'height', '50px');
    });

    it('should clean up 0 second animation styles (queried styles) that contain camel casing when complete',
       () => {
         @Component({
           selector: 'ani-cmp',
           template: `
          <div #elm [@myAnimation]="myAnimationExp">
            <div class="foo"></div>
            <div class="bar"></div>
          </div>
        `,
           animations: [
             trigger(
                 'myAnimation',
                 [
                   state('go', style({width: '200px'})),
                   transition(
                       '* => go',
                       [
                         query('.foo', [style({maxHeight: '0px'})]),
                         query(
                             '.bar',
                             [
                               style({width: '0px'}),
                               animate('1s', style({width: '100px'})),
                             ]),
                       ]),
                 ]),
           ]
         })
         class Cmp {
           @ViewChild('elm') public element: any;

           public myAnimationExp = '';
         }

         TestBed.configureTestingModule({declarations: [Cmp]});

         const engine = TestBed.get(AnimationEngine);
         const fixture = TestBed.createComponent(Cmp);
         const cmp = fixture.componentInstance;

         const elm = cmp.element.nativeElement;
         const foo = elm.querySelector('.foo') as HTMLElement;

         cmp.myAnimationExp = 'go';
         fixture.detectChanges();

         expect(foo.style.getPropertyValue('max-height')).toEqual('0px');

         const player = engine.players.pop();
         player.finish();

         expect(foo.style.getPropertyValue('max-height')).toBeFalsy();
       });
  });
})();

function approximate(value: number, target: number) {
  return Math.abs(target - value) / value;
}

function getPlayer(engine: AnimationEngine, index = 0) {
  return (engine.players[index] as any) !.getRealPlayer();
}

function findStyleObjectWithKeyframes(index?: number): any|null {
  const sheetWithKeyframes = document.styleSheets[document.styleSheets.length - (index || 1)];
  const styleElms = Array.from(document.querySelectorAll('head style') as any as any[]);
  return styleElms.find(elm => elm.sheet == sheetWithKeyframes) || null;
}

function assertEasing(node: any, easing: string) {
  expect((node.style.animationTimingFunction || '').replace(/\s+/g, '')).toEqual(easing);
}

function assertStyle(node: any, prop: string, value: string) {
  expect(node.style[prop] || '').toEqual(value);
}
