function _(el) {
  if (!(this instanceof _)) {
    return new _(el);
  }

  this.el = document.getElementById(el);
}

_.prototype.fade = function fade(type, ms) {
  var isIn = type === 'in',
      opacity = isIn ? 0 : 1,
      interval = 50,
      duration = ms,
      gap = interval / duration,
      self = this;

  if (isIn) {
    self.el.style.display = 'inline';
    self.el.style.opacity = opacity;
  }

  function func() {
    opacity = isIn ? opacity + gap : opacity - gap;
    self.el.style.opacity = opacity;

    if (opacity <= 0) self.el.style.display = 'none';
    if (opacity <= 0 || opacity >= 1) window.clearInterval(fading);
  }

  var fading = window.setInterval(func, interval);
}

function getUrlVars() {
  var vars = {};
  var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m, key, value) {
    vars[key] = value;
  });

  return vars;
}

document.addEventListener('DOMContentLoaded', function() {
  var body = document.getElementsByTagName('body')[0];
  var modal = document.getElementById('modal-options');
  var buttonClose = document.getElementById('modal-btn-close');

  if (typeof (getUrlVars()['ref_source']) !== 'undefined' && getUrlVars()['ref_source'] !== '') {
    _('modal-options').fade('in', 100);
    body.style.overflow = 'hidden';
  }

  if (modal !== null) {
    modal.addEventListener('click', function() {
      _('modal-options').fade('out', 100);
      body.style.overflow = 'visible';
    });

    modal.querySelector('.modal-body').addEventListener('click', function(e) {
      e.stopPropagation();
    }, false);

    buttonClose.addEventListener('click', function() {
      _('modal-options').fade('out', 100);
      body.style.overflow = 'visible';
    });

    document.addEventListener('keyup', function(e) {
      if (e.keyCode == 27) {
        _('modal-options').fade('out', 100);
        body.style.overflow = 'visible';
      }
    });
  }
});

document.addEventListener('DOMContentLoaded', function() {
  var navbarBurgers = Array.prototype.slice.call(document.querySelectorAll('.navbar-burger'), 0);

  if (navbarBurgers.length > 0) {
    navbarBurgers.forEach(function (el) {
      el.addEventListener('click', function () {
        var targetEl = el.dataset.target;
        var target = document.getElementById(targetEl);

        el.classList.toggle('is-active');
        target.classList.toggle('is-active');
      });
    });
  }
});

document.addEventListener('DOMContentLoaded', function() {
  var swiper = new Swiper('.swiper-container', {
    autoplay: {
      delay: 3000,
      disableOnInteraction: false,
    },
    breakpoints: {
      1150: {
        slidesPerView: 4,
      },
      800: {
        slidesPerView: 2,
      },
      500: {
        slidesPerView: 1,
      },
    },
    centeredSlides: true,
    lazy: true,
    loop: true,
    navigation: {
      nextEl: '.swiper-next',
      prevEl: '.swiper-previous',
    },
    slidesPerView: 5,
    spaceBetween: 0,
  });
});