first commit

class/class.CNB.php

@@ -0,0 +1,207 @@
+<?php
+
+use KupShop\I18nBundle\Entity\Currency;
+use KupShop\KupShopBundle\Context\CurrencyContext;
+use KupShop\KupShopBundle\Util\Compat\ServiceContainer;
+
+class CNB
+{
+    private static $url = 'https://www.cnb.cz/cs/financni_trhy/devizovy_trh/kurzy_devizoveho_trhu/denni_kurz.txt';
+
+    // Allowed difference in percent between old and new currency
+    private static $allow_difference = 10;
+
+    /**
+     * @param false $admin
+     *
+     * @throws Exception
+     */
+    public static function updateCurrencies($admin = false)
+    {
+        $new_currencies = self::getSharedCurrencies();
+
+        $currencyContext = ServiceContainer::getService(CurrencyContext::class);
+        $em = ServiceContainer::getService('doctrine.orm.entity_manager');
+
+        $currencies = $currencyContext->getAll();
+
+        $defaultCurrency = $currencyContext->getDefaultId();
+        if ($defaultCurrency == 'CZK') {
+            $conversionRate = DecimalConstants::one();
+        } else {
+            $conversionRate = DecimalConstants::one()->div($new_currencies[$defaultCurrency]);
+        }
+
+        $new_currencies['CZK'] = DecimalConstants::one();
+
+        /** @var Currency $currency */
+        foreach ($currencies as $currency) {
+            if ($currency->getSync() == 'Y') {
+                $currency_name = $currency->getId();
+                if (!empty($new_currencies[$currency_name])) {
+                    $value = self::prepPrice($new_currencies[$currency_name]);
+                    if (!$currency->getCorrections()->isZero()) {
+                        $value = $value->add(self::prepPrice($currency->getCorrections()));
+                    }
+
+                    $value = $value->mul($conversionRate);
+
+                    if ($currency->getRate()->isPositive()) {
+                        $old_currency = $currency->getRate()->asFloat();
+                        $new_currency = $value->asFloat();
+
+                        $difference = ($old_currency - $new_currency) / ($old_currency / 100);
+
+                        if (!$admin && abs($difference) > self::$allow_difference) {
+                            throw new Exception('Aktualizace kurzu měn selhala. Měna "'.$currency_name.'", rozdíl '.round($difference, 2)." % !!, stará = '{$old_currency}', nová = '{$new_currency}'");
+                        }
+                    }
+
+                    $currency->setRate($value);
+
+                    $currency->setSyncDateUpdated();
+                }
+            }
+        }
+        $em->flush();
+
+        $dispatcher = ServiceContainer::getService('event_dispatcher');
+        $dispatcher->dispatch(new KupShop\KupShopBundle\Event\CNBSyncEvent(), KupShop\KupShopBundle\Event\CNBSyncEvent::NAME);
+    }
+
+    public static function prepPrice($price, $div = null)
+    {
+        $price = toDecimal(floatval(str_replace(',', '.', trim($price))));
+
+        if ($div) {
+            $div = toDecimal(floatval(str_replace(',', '.', trim($div))));
+            if ($div->isPositive()) {
+                $price = $price->div($div);
+            }
+        }
+
+        return $price;
+    }
+
+    /**
+     * @throws Exception
+     */
+    public static function getCurrency($currency): Decimal
+    {
+        if ($currency === 'CZK') {
+            return Decimal::create(1, 20);
+        }
+        $currencies = static::getCurrencies();
+
+        if (!isset($currencies[$currency])) {
+            throw new Exception("CNB: Undefined currency: {$currency}");
+        }
+
+        return $currencies[$currency];
+    }
+
+    /**
+     * Download actual CNB currencies and update on shared DB.
+     *
+     * @throws Exception
+     */
+    public static function updateSharedCurrencies(): void
+    {
+        $currencies = self::downloadCurrencies();
+
+        foreach ($currencies as $id => $rate) {
+            sqlQuery(
+                'INSERT INTO kupshop_shared.cnb_currencies (id,rate)
+                            VALUES (:id, :rate)
+                            ON DUPLICATE KEY UPDATE id=:id, rate=:rate',
+                [
+                    'id' => $id,
+                    'rate' => $rate,
+                ]
+            );
+        }
+    }
+
+    /**
+     * @return Decimal[]
+     *
+     * @throws Exception
+     */
+    public static function getCurrencies(): array
+    {
+        static $currencies = null;
+
+        if (!$currencies) {
+            $currencies = static::getSharedCurrencies();
+        }
+
+        return $currencies;
+    }
+
+    /**
+     * @return Decimal[]
+     *
+     * @throws Exception
+     */
+    private static function downloadCurrencies(): array
+    {
+        $currencies_file = self::downloadFile();
+
+        $currencies = [];
+        foreach ($currencies_file as $v) {
+            $h = explode('|', $v);
+            if (!empty($h[3])) {
+                $currencies[$h[3]] = self::prepPrice($h[4], $h[2]);
+            }
+        }
+
+        return $currencies;
+    }
+
+    /**
+     * Get CNB currencies from shared db.
+     */
+    private static function getSharedCurrencies(): array
+    {
+        $result = sqlQueryBuilder()->select('id, rate')
+            ->from('kupshop_shared.cnb_currencies')
+            ->execute();
+
+        $currencies = [];
+
+        foreach ($result as $row) {
+            $currencies[$row['id']] = Decimal::create($row['rate'], 20);
+        }
+
+        return $currencies;
+    }
+
+    /**
+     * @throws Exception
+     */
+    private static function downloadFile(): array
+    {
+        $file = file(self::$url);
+
+        if ($file === false) {
+            throw new Exception('Soubor CNB nedostupny.');
+        }
+
+        return $file;
+    }
+
+    public static function setUrl(string $url)
+    {
+        self::$url = $url;
+    }
+
+    /**
+     * @throws Exception
+     */
+    public static function convertPrice(Decimal $price, $from, $to)
+    {
+        $exchange_rate = self::getCurrency($from)->div(self::getCurrency($to));
+
+        return $price->mul($exchange_rate);
+    }
+}