window.track = function (action, adId) {
  var message = {message: 'Prebid Native', adId: adId};
  if (action === 'click') { message.action = 'click'; }
  window.parent.postMessage(JSON.stringify(message), '*');
}

var render = function(bid, adUnitDivId) {
  // Can include CSS styles here, or just use styles from your site.
  var markup = `
<style>
.native-ad {
  background-color: #fff;
  border: 1px solid #EDEDED;
  border-radius: 4px;
  overflow: hidden;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 12px;
  height: 248px;
  width: 298px;
  position: relative;
}

.inset-box {
  border-radius: 2px;
  background-color: #fff;
  position: absolute;
  padding: 2px 5px;
}

.inset-box-text {
  display: block;
  height: 15px;
  font-size: 12px;
  line-height: 14px;
  text-align: center;
  color: #333333;
  text-decoration: none;
}

.attribution {
  left: 10px;
  top: 10px;
}

.image img {
  height: 158px;
  width: 298px;
  border-radius: 4px 4px 0 0;
  object-fit: cover;
}

.advertiser {
  width: 96px;
  right: 10px;
  top: 10px;
}

.title {
  height: 24px;
  text-align: center;
  margin-top: 10px;
  margin-bottom: 10px;
}

.title a {
  color: #000000;
  font-size: 20px;
  font-weight: bold;
  line-height: 25px;
  text-decoration: none;
}

.call-to-action {
  display: block;
  width: 77px;
  border-radius: 4px;
  background-color: #3E86C7;
  margin: 0 auto;
  padding: 8px 15.5px;
  text-align: center;
  text-decoration: none;
}

.call-to-action-text {
  height: 18px;
  color: #FFFFFF;
  font-size: 14px;
  font-weight: bold;
  line-height: 17px;
}
</style>
<div class='native-ad'>
  <div class='attribution inset-box'>
    <span class='inset-box-text'>Ad</span>
  </div>
  <div class='image'>
    <a href='${bid.native.clickUrl}' target='_blank' onclick="window.track('click', '${bid.adId}');"><img src='${bid.native.image.url}'></a>
  </div>
  <div class='advertiser inset-box'>
    <a id='native-brand' class='inset-box-text' href='${bid.native.clickUrl}' target='_blank' onclick="window.track('click', '${bid.adId}');">${bid.native.sponsoredBy}</a>
  </div>
  <div class='title'>
    <a id='native-title' href='${bid.native.clickUrl}' target='_blank' onclick="window.track('click', '${bid.adId}');">${bid.native.title}</a>
  </div>
  <a class='call-to-action' href='${bid.native.clickUrl}' target='_blank' onclick="window.track('click', '${bid.adId}');">
    <span class='call-to-action-text'>Learn More</span>
  </a>
</div>`

  // Insert ad into document.
  var container = document.createElement("div");
  container.innerHTML = markup;
  document.getElementById(adUnitDivId).appendChild(container);

  window.track('impression', bid.adId);
};

window.NativeRenderer = render