Add NPS

Business/Marketing/NetPromoterScore.php

@@ -0,0 +1,91 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.1
+ *
+ * @category   TBD
+ * @package    TBD
+ * @author     OMS Development Team <dev@oms.com>
+ * @author     Dennis Eichhorn <d.eichhorn@oms.com>
+ * @copyright  2013 Dennis Eichhorn
+ * @license    OMS License 1.0
+ * @version    1.0.0
+ * @link       http://orange-management.com
+ */
+namespace phpOMS\Business\Marketing;
+
+/**
+ * Net Promoter Score
+ *
+ * @category   Framework
+ * @package    phpOMS\Business
+ * @author     OMS Development Team <dev@oms.com>
+ * @author     Dennis Eichhorn <d.eichhorn@oms.com>
+ * @license    OMS License 1.0
+ * @link       http://orange-management.com
+ * @since      1.0.0
+ */
+class NetPromoterScore {
+    /**
+     * Score values
+     *
+     * @var int[]
+     * @since 1.0.0
+     */
+    private $scores = [];
+
+    /**
+     * Constructor.
+     *
+     * @since  1.0.0
+     * @author Dennis Eichhorn <d.eichhorn@oms.com>
+     */
+    public function __construct() {
+
+    }
+
+    /**
+     * Add score.
+     *
+     * @param int $score Net promoter score
+     *
+     * @return void
+     *
+     * @since  1.0.0
+     * @author Dennis Eichhorn <d.eichhorn@oms.com>
+     */
+    public function add(int $score) /* : void */
+    {
+        $this->scores[] = $score;
+    }
+
+    /**
+     * Get total NPS.
+     *
+     * @return int
+     *
+     * @since  1.0.0
+     * @author Dennis Eichhorn <d.eichhorn@oms.com>
+     */
+    public function getScore() : int
+    {
+        $promoters = 0;
+        $passives = 0;
+        $detractors = 0;
+
+        foreach($this->scores as $score) {
+            if($score > 8) {
+                $promoters++;
+            } elseif($score > 6) {
+                $passives++;
+            } else {
+                $detractors++;
+            }
+        }
+
+        $total = $promoters + $passives + $detractors;
+
+        return ((int) ($promoters / $total)) - ((int) ($detractors / $total));
+    }
+}