Merge pull request adopted-ember-addons#240 from dcyriller/segment-up…

…grade

Update Segment's loading snippet

addon/metrics-adapters/segment.js

@@ -16,10 +16,94 @@ export default BaseAdapter.extend({
 
     assert(`[ember-metrics] You must pass a valid \`key\` to the ${this.toString()} adapter`, segmentKey);
 
-    /* eslint-disable */
-    window.analytics=window.analytics||[],window.analytics.methods=["identify","group","track","page","pageview","alias","ready","on","once","off","trackLink","trackForm","trackClick","trackSubmit"],window.analytics.factory=function(t){return function(){var a=Array.prototype.slice.call(arguments);return a.unshift(t),window.analytics.push(a),window.analytics}};for(var i=0;i<window.analytics.methods.length;i++){var key=window.analytics.methods[i];window.analytics[key]=window.analytics.factory(key)}window.analytics.load=function(t){if(!document.getElementById("analytics-js")){var a=document.createElement("script");a.type="text/javascript",a.id="analytics-js",a.async=!0,a.src=("https:"===document.location.protocol?"https://":"http://")+"cdn.segment.com/analytics.js/v1/"+t+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(a,n)}},window.analytics.SNIPPET_VERSION="2.0.9";
-    /* eslint-enable */
-    window.analytics.load(segmentKey);
+    // start of segment loading snippet, taken here:
+    // https://segment.com/docs/connections/sources/catalog/libraries/website/javascript/quickstart/#step-1-copy-the-snippet
+
+    /* eslint-disable no-console */
+
+    // Create a queue, but don't obliterate an existing one!
+    let analytics = window.analytics = window.analytics || [];
+
+    // If the real analytics.js is already on the page return.
+    if (analytics.initialize) return;
+
+    // If the snippet was invoked already show an error
+    if (analytics.invoked) {
+      if (window.console && console.error) {
+        console.error('Segment snippet included twice.');
+      }
+      return;
+    }
+
+    // Invoked flag, to make sure the snippet
+    // is never invoked twice.
+    analytics.invoked = true;
+
+    // A list of the methods in Analytics.js to stub.
+    analytics.methods = [
+      'trackSubmit',
+      'trackClick',
+      'trackLink',
+      'trackForm',
+      'pageview',
+      'identify',
+      'reset',
+      'group',
+      'track',
+      'ready',
+      'alias',
+      'debug',
+      'page',
+      'once',
+      'off',
+      'on'
+    ];
+
+    // Define a factory to create stubs. These are placeholders
+    // for methods in Analytics.js so that you never have to wait
+    // for it to load to actually record data. The `method` is
+    // stored as the first argument, so we can replay the data.
+    analytics.factory = function(method){
+      return function(){
+        var args = Array.prototype.slice.call(arguments);
+        args.unshift(method);
+        analytics.push(args);
+        return analytics;
+      };
+    };
+
+    // For each of our methods, generate a queueing stub.
+    for (var i = 0; i < analytics.methods.length; i++) {
+      var key = analytics.methods[i];
+      analytics[key] = analytics.factory(key);
+    }
+
+    // Define a method to load Analytics.js from our CDN,
+    // and that will be sure to only ever load it once.
+    analytics.load = function(key, options){
+      // Create an async script element based on your key.
+      var script = document.createElement('script');
+      script.type = 'text/javascript';
+      script.async = true;
+      script.src = 'https://cdn.segment.com/analytics.js/v1/'
+        + key + '/analytics.min.js';
+
+      // Insert our script next to the first script element.
+      var first = document.getElementsByTagName('script')[0];
+      first.parentNode.insertBefore(script, first);
+      analytics._loadOptions = options;
+    };
+
+    // Add a version to keep track of what's in the wild.
+    analytics.SNIPPET_VERSION = '4.1.0';
+
+    // Load Analytics.js with your key, which will automatically
+    // load the tools you've enabled for your account.
+    analytics.load(segmentKey);
+
+    /* eslint-enable no-console */
+
+    // end of segment loading snippet
   },
 
   alias(options = {}) {
@@ -61,5 +145,5 @@ export default BaseAdapter.extend({
     removeFromDOM('script[src*="segment.com"]');
 
     delete window.analytics;
-  }
+  },
 });