<!--Copyright at bottom -->

<div axis="random" duration="800" class="sc-card">
  <div class="umbra"></div>
  <div class="penumbra"></div>

  <div class="front" tabindex="-1">
    <h1>Supercharged</h1>
    <button>Flip card</button>
  </div>

  <div class="back" tabindex="-1">
    <button>Flip card</button>
  </div>
</div>


<!--
Copyright 2016 Google Inc. All rights reserved.
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.
-->

/* Copyright at bottom */

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #E2E2E2;
    overflow: hidden;
}

.sc-card {
    width: 260px;
    height: 380px;
    position: relative;
    perspective: 500px;
    will-change: transform;
}

.sc-card .front,
.sc-card .back {
    backface-visibility: hidden;
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
}

.sc-card button {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: none;
    border: none;
    color: transparent;
    cursor: pointer;
}

.sc-card .front {
    background: #444;
    color: #FFF;
}

.sc-card .front h1 {
    font-size: 24px;
}

.sc-card .back {
    background: url('//cdn.rawgit.com/GoogleChrome/ui-element-samples/gh-pages/3d-card-flip/images/supercharged.jpg') center center no-repeat;
    color: #FFF;
    transform: rotateY(180deg);
}

.sc-card .umbra,
.sc-card .penumbra {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    backface-visibility: visible;
}

.sc-card .umbra {
    width: 270px;
    height: 390px;
    top: -5px;
    left: -5px;
    background: url('//cdn.rawgit.com/GoogleChrome/ui-element-samples/gh-pages/3d-card-flip/images/umbra.svg') center center no-repeat;
    transform: translateZ(-1px) translateY(2px);
    opacity: 0.3;
}

.sc-card .penumbra {
    width: 330px;
    height: 450px;
    top: -35px;
    left: -35px;
    background: url('//cdn.rawgit.com/GoogleChrome/ui-element-samples/gh-pages/3d-card-flip/images/penumbra.svg') center center no-repeat;
    transform: translateZ(-1px) translateY(2px);
    opacity: 0;
}

/**
 *
 * Copyright 2016 Google Inc. All rights reserved.
 *
 * 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.
 */

// Copyright at bottom
// From https://github.com/GoogleChrome/ui-element-samples/tree/gh-pages/3d-card-flip

// Modified to also support IE11, Edge, Firefox, Safari
// Custom element is not used and Web animations api polyfill is used


'use strict';

const log = console.log.bind(console);

class SCFlipCard { //extends HTMLElement {
  constructor(element) {
    // super();
    this.element = element;
    this.createdCallback();
    this.attachedCallback();
  }

  static get SIDES() {
    return {
      FRONT: 1,
      BACK: 2
    };
  }

  flip() {
    if (this._locked) {
      return;
    }

    this._locked = true;

    //const scale = (500 + 200) / 500; // 500 because css perspective is set to this value
    const scale = 1;

    const sideOne = [
      {transform: `translateZ(1px) rotate${this._axis}(0deg) scale(${scale})`},
      {transform: `translateZ(100px) rotate${this._axis}(0deg) scale(${scale})`, offset: 0.15},
      {transform: `translateZ(100px) rotate${this._axis}(180deg) scale(${scale})`, offset: 0.65},
      {transform: `translateZ(1px) rotate${this._axis}(180deg) scale(${scale})`}
    ];

    const sideTwo = [
      {transform: `translateZ(1px) rotate${this._axis}(180deg) scale(${scale})`},
      {transform: `translateZ(100px) rotate${this._axis}(180deg) scale(${scale})`, offset: 0.15},
      {transform: `translateZ(100px) rotate${this._axis}(360deg) scale(${scale})`, offset: 0.65},
      {transform: `translateZ(1px) rotate${this._axis}(360deg) scale(${scale})`}
    ];

    /*
     const sideOne = [
     {transform: `translateZ(-200px) rotate${this._axis}(0deg) scale(${scale})`},
     {transform: `translateZ(-100px) rotate${this._axis}(0deg) scale(${scale})`, offset: 0.15},
     {transform: `translateZ(-100px) rotate${this._axis}(180deg) scale(${scale})`, offset: 0.65},
     {transform: `translateZ(-200px) rotate${this._axis}(180deg) scale(${scale})`}
     ];

     const sideTwo = [
     {transform: `translateZ(-200px) rotate${this._axis}(180deg) scale(${scale})`},
     {transform: `translateZ(-100px) rotate${this._axis}(180deg) scale(${scale})`, offset: 0.15},
     {transform: `translateZ(-100px) rotate${this._axis}(360deg) scale(${scale})`, offset: 0.65},
     {transform: `translateZ(-200px) rotate${this._axis}(360deg) scale(${scale})`}
     ]; */

    const umbra = [
      {opacity: 0.3, transform: `translateY(2px) rotate${this._axis}(0deg)`},
      {opacity: 0.0, transform: `translateY(62px) rotate${this._axis}(0deg)`, offset: 0.15},
      {opacity: 0.0, transform: `translateY(62px) rotate${this._axis}(180deg)`, offset: 0.65},
      {opacity: 0.3, transform: `translateY(2px) rotate${this._axis}(180deg)`}
    ];

    const penumbra = [
      {opacity: 0.0, transform: `translateY(2px) rotate${this._axis}(0deg)`},
      {opacity: 0.5, transform: `translateY(62px) rotate${this._axis}(0deg)`, offset: 0.15},
      {opacity: 0.5, transform: `translateY(62px) rotate${this._axis}(180deg)`, offset: 0.65},
      {opacity: 0.0, transform: `translateY(2px) rotate${this._axis}(180deg)`}
    ];

    const timing = {
      duration: this._duration,
      iterations: 1,
      easing: 'ease-in-out',
      fill: 'forwards'
    };

    switch (this._side) {
      case SCFlipCard.SIDES.FRONT:
        this._front.animate(sideOne, timing);
        this._back.animate(sideTwo, timing);

        this._back.focus();
        this._front.inert = true;
        this._back.inert = false;
        break;

      case SCFlipCard.SIDES.BACK:
        this._front.animate(sideTwo, timing);
        this._back.animate(sideOne, timing);

        this._front.focus();
        this._front.inert = false;
        this._back.inert = true;
        break;

      default:
        throw new Error('Unknown side');
    }

    this._umbra.animate(umbra, timing);
    this._penumbra.animate(penumbra, timing)
      .onfinish = _ => {
      this._locked = false;
      this._side = (this._side === SCFlipCard.SIDES.FRONT) ?
        SCFlipCard.SIDES.BACK :
        SCFlipCard.SIDES.FRONT;
    };
  }

  createdCallback() {
    this._locked = false;
    this._side = SCFlipCard.SIDES.FRONT;
    this._front = this.element.querySelector('.front');
    this._back = this.element.querySelector('.back');
    this._buttons = this.element.querySelectorAll('button');
    this._umbra = this.element.querySelector('.umbra');
    this._penumbra = this.element.querySelector('.penumbra');

    this._front.inert = false;
    this._back.inert = true;

    this._duration = parseInt(this.element.getAttribute('duration'), 10);
    if (isNaN(this._duration)) {
      this._duration = 800;
    }

    this._axis = this.element.getAttribute('axis') || 'X';
    if (this._axis.toUpperCase() === 'RANDOM') {
      this._axis = (Math.random() > 0.5 ? 'Y' : 'X');
    }
  }

  attachedCallback() {
    [].slice.call(this._buttons)
      .forEach(b => {
        b.addEventListener('click', _ => this.flip());
      });
  }

  detachedCallback() {

  }
}


let card = new SCFlipCard(document.querySelector('.sc-card'));

// if(document.registerElement) document.registerElement('sc-card', SCFlipCard);


/**
 *
 * Copyright 2016 Google Inc. All rights reserved.
 *
 * 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.
 */