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msd2/tracking/piwik/plugins/Goals/Columns/Metrics/AveragePrice.php

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+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Plugins\Goals\Columns\Metrics;
+
+use Piwik\Archive\DataTableFactory;
+use Piwik\DataTable;
+use Piwik\DataTable\Row;
+use Piwik\Metrics\Formatter;
+use Piwik\Piwik;
+use Piwik\Plugin\ProcessedMetric;
+use Piwik\Tracker\GoalManager;
+
+/**
+ * The average price for each ecommerce order or abandoned cart. Calculated as:
+ *
+ *     price / (orders or abandoned_carts)
+ *
+ * price, orders and abandoned_carts are calculated by the Goals archiver.
+ */
+class AveragePrice extends ProcessedMetric
+{
+    private $idSite;
+
+    public function getName()
+    {
+        return 'avg_price';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('General_AveragePrice');
+    }
+
+    public function compute(Row $row)
+    {
+        $price = $this->getMetric($row, 'price');
+        $orders = $this->getMetric($row, 'orders');
+        $abandonedCarts = $this->getMetric($row, 'abandoned_carts');
+
+        return Piwik::getQuotientSafe($price, $orders === false ? $abandonedCarts : $orders, GoalManager::REVENUE_PRECISION);
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('price', 'orders', 'abandoned_carts');
+    }
+
+    public function format($value, Formatter $formatter)
+    {
+        return $formatter->getPrettyMoney($value, $this->idSite);
+    }
+
+    public function beforeFormat($report, DataTable $table)
+    {
+        $this->idSite = DataTableFactory::getSiteIdFromMetadata($table);
+        return !empty($this->idSite); // skip formatting if there is no site to get currency info from
+    }
+}