<div class="js-container container"></div>

@keyframes confetti-slow {
  0% { transform: translate3d(0, 0, 0) rotateX(0) rotateY(0); }
  
  100% { transform: translate3d(25px, 105vh, 0) rotateX(360deg) rotateY(180deg); }
}

@keyframes confetti-medium {
  0% { transform: translate3d(0, 0, 0) rotateX(0) rotateY(0); }
  
  100% { transform: translate3d(100px, 105vh, 0) rotateX(100deg) rotateY(360deg); }
}

@keyframes confetti-fast {
  0% { transform: translate3d(0, 0, 0) rotateX(0) rotateY(0); }
  
  100% { transform: translate3d(-50px, 105vh, 0) rotateX(10deg) rotateY(250deg); }
}

.container {
  width: 100vw;
  height: 100vh;
  background: #F4F6FC
   ;
}

.confetti-container {
  perspective: 700px;
  position: absolute;
  overflow: hidden;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.confetti {
  position: absolute;
  z-index: 1;
  top: -10px;
  border-radius: 0%;

  &--animation-slow {
    animation: confetti-slow 15.25s linear 1 forwards;
  }
  
  &--animation-medium {
    animation: confetti-medium 15.75s linear 1 forwards;
  }
  
  &--animation-fast {
    animation: confetti-fast 8.25s linear 1 forwards;
  }
}

const Confettiful = function(el) {
  this.el = el;
  this.containerEl = null;
  
  this.confettiFrequency = 3;
  this.confettiColors = ['#fce18a', '#ff726d', '#b48def', '#f4306d'];
  this.confettiAnimations = ['slow', 'medium', 'fast'];
  
  this._setupElements();
  this._renderConfetti();
};

Confettiful.prototype._setupElements = function() {
  const containerEl = document.createElement('div');
  const elPosition = this.el.style.position;
  
  if (elPosition !== 'relative' || elPosition !== 'absolute') {
    this.el.style.position = 'relative';
  }
  
  containerEl.classList.add('confetti-container');
  
  this.el.appendChild(containerEl);
  
  this.containerEl = containerEl;
};

Confettiful.prototype._renderConfetti = function() {
  this.confettiInterval = setInterval(() => {
    const confettiEl = document.createElement('div');
    const confettiSize = (Math.floor(Math.random() * 0) + 7) + 'px';
    const confettiBackground = this.confettiColors[Math.floor(Math.random() * this.confettiColors.length)];
    const confettiLeft = (Math.floor(Math.random() * this.el.offsetWidth)) + 'px';
    const confettiAnimation = this.confettiAnimations[Math.floor(Math.random() * this.confettiAnimations.length)];
    
    confettiEl.classList.add('confetti', 'confetti--animation-' + confettiAnimation);
    confettiEl.style.left = confettiLeft;
    confettiEl.style.width = confettiSize;
    confettiEl.style.height = confettiSize;
    confettiEl.style.backgroundColor = confettiBackground;
    
    confettiEl.removeTimeout = setTimeout(function() {
      confettiEl.parentNode.removeChild(confettiEl);
    }, 8000);
    
    this.containerEl.appendChild(confettiEl);
  }, 8);
};

window.confettiful = new Confettiful(document.querySelector('.js-container'));