Show the price in base currency if exchange rates are available.

src/Services/PricedetailHelper.php

@@ -0,0 +1,89 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Services;
+
+use App\Entity\PriceInformations\Currency;
+use App\Entity\PriceInformations\Pricedetail;
+use Locale;
+use Money\Number;
+use Symfony\Component\Intl\Currencies;
+
+class PricedetailHelper
+{
+    protected $base_currency;
+    protected $locale;
+
+    public function __construct(string $base_currency)
+    {
+        $this->base_currency = $base_currency;
+        $this->locale = Locale::getDefault();
+    }
+
+    /**
+     * Converts the given value in origin currency to the choosen target currency
+     * @param $value float|string The value that should be converted
+     * @param Currency|null $originCurrency The currency the $value is given in.
+     * Set to null, to use global base currency.
+     * @param Currency|null $targetCurrency The target currency, to which $value should be converted.
+     * Set to null, to use global base currency.
+     * @return string|null The value in $targetCurrency given as bcmath string.
+     * Returns null, if it was not possible to convert between both values (e.g. when the exchange rates are missing)
+     */
+    public function convertMoneyToCurrency($value, ?Currency $originCurrency = null, ?Currency $targetCurrency = null) : ?string
+    {
+        $value = (string) $value;
+
+        //Convert value to base currency
+        $val_base = $value;
+        if($originCurrency !== null) {
+            //Without an exchange rate we can not calculate the exchange rate
+            if ((float) $originCurrency->getExchangeRate() === 0) {
+                return null;
+            }
+
+            $val_base = bcmul($value, $originCurrency->getExchangeRate(), Pricedetail::PRICE_PRECISION);
+        }
+
+        //Convert value in base currency to target currency
+        $val_target = $val_base;
+        if ($targetCurrency !== null) {
+            //Without an exchange rate we can not calculate the exchange rate
+            if ($targetCurrency->getExchangeRate() === null) {
+                return null;
+            }
+
+            $val_target = bcmul($val_base, $targetCurrency->getInverseExchangeRate(), Pricedetail::PRICE_PRECISION);
+        }
+
+        return $val_target;
+    }
+}