<div class="calendar">
  <div class="pages"></div>
</div>
@page-color: #eee;

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-family: 'Zilla Slab', serif;
  background: #577386;
  overflow: hidden;
}

p {
  margin: 0 0 3px;
  line-height: 1;
  letter-spacing: 1px;
  pointer-events: none;
}

.calendar {
  position: relative;
  width: 152px;
  cursor: default;
  user-select: none;
  
  &::before,
  &::after {
    content: '';
    position: absolute;
    top: -28px;
    left: 40px;
    width: 10px;
    height: 10px;
    border-radius: 5px;
    background: #ddd;
    z-index: 3;
  }
  
  &::after {
    left: initial;
    right: 40px;
  }
}

.pages {
  position: relative;
  text-align: center;
  background: @page-color;
  box-shadow: 0 10px 0 0px #a5a4a4;;
  
  &::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 45px;
    background: indianred;
    bottom: 100%;
    left: 0;
    z-index: 2;
  }
}

.page {
  position: relative;
  padding: 20px 30px 15px;
  background: @page-color;
  
  &::before {
    content: '';
    position: absolute;
    bottom: 99%;
    left: 0;
    display: block;
    background: 
      linear-gradient(-45deg, @page-color 10px, @page-color 10px, @page-color 10px,  transparent 0), 
      linear-gradient(45deg, @page-color 10px, transparent 0);
    background-position: left top;
    background-repeat: repeat-x;
    background-size: 10px 18px;
    height: 10px;
    width: 100%;
  }
}

.month,
.day-name {
  text-transform: uppercase;
  font-weight: 600;
}

.day {
  font-size: 60px;
  font-weight: 700;
  margin: 0 0 15px;
}

.year {
  font-size: 12px;
}

.tear {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  transform-origin: top left;
  box-shadow: 0 0 10px -1px rgba(0,0,0,0.5);
  pointer-events: none;
  animation: tear-animation .8s linear forwards;
}

@keyframes tear-animation {
  0% {
    transform: rotate(0deg);
    top: 0;
    opacity: 1;
  }
  20% {
    transform: rotate(9deg);
    top: 0;
    opacity: 1;
  }
  70% {
    opacity: 1;
  }
  100% {
    top: 200px;
    opacity: 0;
  }
}
const pages = document.querySelector('.pages');
const locale = window.navigator.language || 'en-us'

let date = new Date();
let dayNum = date.getDate();
let month = date.getMonth();
let dayName = date.toLocaleString(locale, { weekday: 'long' });
let monthName = date.toLocaleString(locale, { month: 'long' });
let year = date.getFullYear();

function daysInMonth (month, year) {
  return new Date(year, month + 1, 0).getDate();
}

function getNewDate () {
  if (dayNum < daysInMonth(month, year)) {
    dayNum++;
  } else {
    dayNum = 1;
  } 
  if (dayNum === 1 && month < 11) {
    month++;
  } else if (dayNum === 1 && month === 11) {
    month = 0;
  }
  if (dayNum ===1 && month === 0) {
    year++;
  }
  const newDate = new Date(year, month, dayNum);
  dayName = newDate.toLocaleString('en-us', { weekday: 'long' });
  monthName = newDate.toLocaleString('en-us', { month: 'long' });
}

function handleClick (e) {
  getNewDate();
  updateCalendar(e.target);
}

function updateCalendar (target) {
  if (target && target.classList.contains('page')) {
    target.classList.add('tear');
    setTimeout(() => {
      pages.removeChild(target);
    }, 800);
  } else {
    return;
  }
  renderPage();
}

function renderPage () {
  const newPage = document.createElement('div');
  newPage.classList.add('page');
  newPage.innerHTML = `
    <p class="month">${monthName}</p>
    <p class="day">${dayNum}</p>
    <p class="day-name">${dayName}</p>
    <p class="year">${year}</p>
  `;
  pages.appendChild(newPage);
}

renderPage();

pages.addEventListener('click', handleClick);
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