// Declaring constants
// Meant to represent number of items per page
var MAXITEMSPERPAGE = 5;

function openTab(evt, tabName) {
    // Declare all variables
    var i, tabcontent, tablinks;

    // Get all elements with class="tabcontent" and hide them
    tabcontent = document.getElementsByClassName("tabcontent");
    for (i = 0; i < tabcontent.length; i++) {
        tabcontent[i].style.display = "none";
    }

    // Get all elements with class="tablinks" and remove the class "active"
    tablinks = document.getElementsByClassName("tablinks");
    for (i = 0; i < tablinks.length; i++) {
        tablinks[i].className = tablinks[i].className.replace(" active", "");
    }

    // Show the current tab, and add an "active" class to the button that opened the tab
    document.getElementById(tabName).style.display = "block";
    evt.currentTarget.className += " active";
}


// Toggles hamburger-menu
function toggleMenu(){
      $('.hamburger').toggleClass('is-active');
      $('#main-nav').toggleClass('toggled');
}

// Scroll to top
$(window).scroll(function() {
    if ($(this).scrollTop() >= 50) {
        $('.scrollMobile').fadeIn(200);
    } else {
        $('.scrollMobile').fadeOut(200);
    }
});

$(".scrollMobile").click(function() {
    $('html, body').animate({
        scrollTop: $("#navbar-wrapper").offset().top
    }, ($(document).height() - 800));
});

// Display current amount of items in shopping cart
function getAmount() {
    var amount = 0;
    $.each(document.cookie.split(/; */), function()  {
        var splitCookie = this.split('=');
        if (splitCookie[0].length == 36) {
            amount++;
        }
    });
    if (amount > 0) {
        $('#shopping-items').html(amount);
    }
    else {
        $('#shopping-items').html('');
    }
}

$(document).ready(function(){
    getAmount();
});


// Add item to cart
function addItem(){
    var expires;
    var date = new Date();
    date.setDate(date.getDate() + 7);
    expires = "; expires=" + date.toGMTString();

    // set cookie
    document.cookie = $('#courseID').html() + "=" +  $('#courseID').html() + expires + "; path=/site/";

    showPopup();
    getAmount();
}

// Shopping cart popup
function showPopup() {
    $('.pop-up').toggleClass('hidden').fadeIn('slow');
    $('.pop-up').css('opacity', '1');
}

// Delete item from cart
function deleteItem(id) {
    document.cookie = id + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT;path=/site/;";
    location.reload();
}