function loadCSS(src) {
  jQuery('<link>').appendTo($('head')).attr({
    type : 'text/css',
    rel : 'stylesheet'
  }).attr('href', src);
}

function loadJS(url, callback) {
  var head = document.getElementsByTagName('head')[0];
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.src = url;

  script.onreadystatechange = callback;
  script.onload = callback;

  head.appendChild(script);
}

function loadFancyBoxCheckout() {
  if (!detectmob()) {
    jQuery('.hotmart-fb').fancybox({
      type : 'iframe',
      toolbar  : false,
      smallBtn : true,
      iframe : {
        css : {
          width : '600px'
        },
        attr: {
          allowpaymentrequest: 'true'
        }
      }
    });
  } else{
    jQuery('.hotmart-fb').attr("onclick","return true");
  }
  loadCSS('//static.hotmart.com/checkout/fancybox/jquery.fancybox.min.css');
}

function loadFancyBox() {
  loadJS('//static.hotmart.com/checkout/fancybox/jquery.fancybox.min.js', loadFancyBoxCheckout);
}

loadJS('//static.hotmart.com/checkout/jquery/jquery-3.2.1.min.js', loadFancyBox);

function detectmob() {
  if (screen.width <= 600
    || navigator.userAgent.match(/Android/i)
    || navigator.userAgent.match(/webOS/i)
    || navigator.userAgent.match(/iPhone/i)
    || navigator.userAgent.match(/iPad/i)
    || navigator.userAgent.match(/iPod/i)
    || navigator.userAgent.match(/BlackBerry/i)
    || navigator.userAgent.match(/Windows Phone/i)
    ) {
    return true;
  }
  else {
    return false;
  }
}

function removeCheckoutButton () {
  var checkoutButtons = document.querySelectorAll('a[href*="hotmart.com"]')
  for (var i = 0; i < checkoutButtons.length; i++) {
    checkoutButtons[i].remove()
  }
}

var healthCheckUrl = 'https://api-checkout-vue.hotmart.com/api/version'

if (self.fetch) {
  fetch(healthCheckUrl).catch(function(err) {
    removeCheckoutButton()
  })
} else {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', healthCheckUrl);
  xhr.onreadystatechange = function() {
    if (xhr.readyState !== 4) return;
    if (xhr.status !== 200) {
      removeCheckoutButton()
    }
  }
  xhr.send();
}