From 4b70301e2ad0eed9d9200a80d0b8633f8478e30f Mon Sep 17 00:00:00 2001
From: Elliott Stocks <elliott.stocks@10up.com>
Date: Thu, 7 Apr 2016 22:57:18 +0100
Subject: [PATCH] First pass at tracking individual image hits when
 full-screen, in Carousel

---
 modules/carousel/jetpack-carousel.js  |  8 ++++++++
 modules/carousel/jetpack-carousel.php | 18 ++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/modules/carousel/jetpack-carousel.js b/modules/carousel/jetpack-carousel.js
index dd5868662d6d5..5576995779f48 100644
--- a/modules/carousel/jetpack-carousel.js
+++ b/modules/carousel/jetpack-carousel.js
@@ -692,6 +692,14 @@ jQuery(document).ready(function($) {
 				caption.fadeOut( 'fast' ).empty();
 			}
 
+			// Record pageview in WP Stats, for each new image loaded full-screen.
+			if ( jetpackCarouselStrings.stats ) {
+				new Image().src = document.location.protocol +
+					'//pixel.wp.com/g.gif?' +
+					jetpackCarouselStrings.stats +
+					'&post=' + encodeURIComponent( attachmentId ) +
+					'&rand=' + Math.random();
+			}
 
 			// Load the images for the next and previous slides.
 			$( next ).add( previous ).each( function() {
diff --git a/modules/carousel/jetpack-carousel.php b/modules/carousel/jetpack-carousel.php
index b3d5302dd455d..6118905b8dece 100644
--- a/modules/carousel/jetpack-carousel.php
+++ b/modules/carousel/jetpack-carousel.php
@@ -211,6 +211,24 @@ function enqueue_assets( $output ) {
 				}
 			}
 
+			/**
+			 * Handle WP stats for images in full-screen.
+			 * Build string with tracking info.
+			 */
+			if ( ! in_array( 'stats', Jetpack::get_active_modules() ) ) {
+				$localize_strings['stats'] = 'blog=' . Jetpack_Options::get_option( 'id' ) . '&host=' . parse_url( get_option( 'home' ), PHP_URL_HOST ) . '&v=ext&j=' . JETPACK__API_VERSION . ':' . JETPACK__VERSION;
+
+				// Set the stats as empty if user is logged in but logged-in users shouldn't be tracked.
+				if ( is_user_logged_in() && function_exists( 'stats_get_options' ) ) {
+					$stats_options = stats_get_options();
+					$track_loggedin_users = isset( $stats_options['reg_users'] ) ? (bool) $stats_options['reg_users'] : false;
+
+					if ( ! $track_loggedin_users ) {
+						$localize_strings['stats'] = '';
+					}
+				}
+			}
+
 			/**
 			 * Filter the strings passed to the Carousel's js file.
 			 *