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$('[name=tab]').each(function(i,d){
  var p = $(this).prop('checked');
//   console.log(p);
  if(p){
    $('article').eq(i)
      .addClass('on');
  }    
});

$('[name=tab]').on('change', function(){
  var p = $(this).prop('checked');
  
  // $(type).index(this) == nth-of-type
  var i = $('[name=tab]').index(this);
  
  $('article').removeClass('on');
  $('article').eq(i).addClass('on');
});

// Inspiration: https://tympanus.net/codrops/2012/10/04/custom-drop-down-list-styling/

function DropDown(el) {
    this.dd = el;
    this.placeholder = this.dd.children('span');
    this.opts = this.dd.find('ul.drop li');
    this.val = '';
    this.index = -1;
    this.initEvents();
}

DropDown.prototype = {
    initEvents: function () {
        var obj = this;
        obj.dd.on('click', function (e) {
            e.preventDefault();
            e.stopPropagation();
            $(this).toggleClass('active');
        });
        obj.opts.on('click', function () {
            var opt = $(this);
            obj.val = opt.text();
            obj.index = opt.index();
            obj.placeholder.text(obj.val);
            opt.siblings().removeClass('selected');
            opt.filter(':contains("' + obj.val + '")').addClass('selected');
        }).change();
    },
    getValue: function () {
        return this.val;
    },
    getIndex: function () {
        return this.index;
    }
};

$(function () {
    // create new variable for each menu
    var dd1 = new DropDown($('#noble-gases'));
    // var dd2 = new DropDown($('#other-gases'));
    $(document).click(function () {
        // close menu on document click
        $('.wrap-drop').removeClass('active');
    });
});
$(function () {
    // create new variable for each menu
    var dd1 = new DropDown($('#nobles-act'));
    // var dd2 = new DropDown($('#other-gases'));
    $(document).click(function () {
        // close menu on document click
        $('.wrap-drop').removeClass('active');
    });
});
$(function () {
    // create new variable for each menu
    var dd1 = new DropDown($('#travels'));
    // var dd2 = new DropDown($('#other-gases'));
    $(document).click(function () {
        // close menu on document click
        $('.wrap-drop').removeClass('active');
    });
});

const daysContainer = document.getElementById("daysContainer");
const prevBtn = document.getElementById("prevBtn");
const nextBtn = document.getElementById("nextBtn");
const monthYear = document.getElementById("monthYear");
const dateInput = document.getElementById("dateInput");
const calendar = document.getElementById("calendar");

let currentDate = new Date();
let selectedDate = null;

function handleDayClick(day) {
  selectedDate = new Date(
    currentDate.getFullYear(),
    currentDate.getMonth(),
    day
  );
  dateInput.value = selectedDate.toLocaleDateString("en-US");
  calendar.style.display = "none";
  renderCalendar();
}

function createDayElement(day) {
  const date = new Date(currentDate.getFullYear(), currentDate.getMonth(), day);
  const dayElement = document.createElement("div");
  dayElement.classList.add("day");

if (date.toDateString() === new Date().toDateString()) {
    dayElement.classList.add("current");
  }
  if (selectedDate && date.toDateString() === selectedDate.toDateString()) {
    dayElement.classList.add("selected");
  }

dayElement.textContent = day;
  dayElement.addEventListener("click", () => {
    handleDayClick(day);
  });
  daysContainer.appendChild(dayElement);
}

function renderCalendar() {
  daysContainer.innerHTML = "";
  const firstDay = new Date(
    currentDate.getFullYear(),
    currentDate.getMonth(),
    1
  );
  const lastDay = new Date(
    currentDate.getFullYear(),
    currentDate.getMonth() + 1,
    0
  );

monthYear.textContent = `${currentDate.toLocaleString("default", {
    month: "long"
  })} ${currentDate.getFullYear()}`;

for (let day = 1; day <= lastDay.getDate(); day++) {
    createDayElement(day);
  }
}

prevBtn.addEventListener("click", () => {
  currentDate.setMonth(currentDate.getMonth() - 1);
  renderCalendar();
});

nextBtn.addEventListener("click", () => {
  currentDate.setMonth(currentDate.getMonth() + 1);
  renderCalendar();
});

dateInput.addEventListener("click", () => {
  calendar.style.display = "block";
  positionCalendar();
});

document.addEventListener("click", (event) => {
  if (!dateInput.contains(event.target) && !calendar.contains(event.target)) {
    calendar.style.display = "none";
  }
});

function positionCalendar() {
  const inputRect = dateInput.getBoundingClientRect();
  calendar.style.top = inputRect.bottom + "px";
  calendar.style.left = inputRect.left + "px";
}

window.addEventListener("resize", positionCalendar);

renderCalendar();