Currency.php

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<?php
namespace Magento\Directory\Model;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Exception\InputException;
use Magento\Directory\Model\Currency\Filter;

class Currency extends \Magento\Framework\Model\AbstractModel
{
    const XML_PATH_CURRENCY_ALLOW = 'currency/options/allow';

    const XML_PATH_CURRENCY_DEFAULT = 'currency/options/default';

    const XML_PATH_CURRENCY_BASE = 'currency/options/base';

    protected $_filter;

    protected $_rates;

    protected $_localeFormat;

    protected $_storeManager;

    protected $_directoryHelper;

    protected $_currencyFilterFactory;

    protected $_localeCurrency;

    private $currencyConfig;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Locale\FormatInterface $localeFormat,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Directory\Helper\Data $directoryHelper,
        \Magento\Directory\Model\Currency\FilterFactory $currencyFilterFactory,
        \Magento\Framework\Locale\CurrencyInterface $localeCurrency,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = [],
        CurrencyConfig $currencyConfig = null
    ) {
        parent::__construct(
            $context,
            $registry,
            $resource,
            $resourceCollection,
            $data
        );
        $this->_localeFormat = $localeFormat;
        $this->_storeManager = $storeManager;
        $this->_directoryHelper = $directoryHelper;
        $this->_currencyFilterFactory = $currencyFilterFactory;
        $this->_localeCurrency = $localeCurrency;
        $this->currencyConfig = $currencyConfig ?: ObjectManager::getInstance()->get(CurrencyConfig::class);
    }

    protected function _construct()
    {
        $this->_init(\Magento\Directory\Model\ResourceModel\Currency::class);
    }

    public function getCode()
    {
        return $this->_getData('currency_code');
    }

    public function getCurrencyCode()
    {
        return $this->_getData('currency_code');
    }

    public function getRates()
    {
        return $this->_rates;
    }

    public function setRates(array $rates)
    {
        $this->_rates = $rates;
        return $this;
    }

    public function load($id, $field = null)
    {
        $this->unsRate();
        $this->setData('currency_code', $id);
        return $this;
    }

    public function getRate($toCurrency)
    {
        $code = $this->getCurrencyCodeFromToCurrency($toCurrency);
        $rates = $this->getRates();
        if (!isset($rates[$code])) {
            $rates[$code] = $this->_getResource()->getRate($this->getCode(), $toCurrency);
            $this->setRates($rates);
        }
        return $rates[$code];
    }

    public function getAnyRate($toCurrency)
    {
        $code = $this->getCurrencyCodeFromToCurrency($toCurrency);
        $rates = $this->getRates();
        if (!isset($rates[$code])) {
            $rates[$code] = $this->_getResource()->getAnyRate($this->getCode(), $toCurrency);
            $this->setRates($rates);
        }
        return $rates[$code];
    }

    public function convert($price, $toCurrency = null)
    {
        if ($toCurrency === null) {
            return $price;
        } elseif ($rate = $this->getRate($toCurrency)) {
            return (float)$price * (float)$rate;
        }

        throw new \Exception(__(
            'Undefined rate from "%1-%2".',
            $this->getCode(),
            $this->getCurrencyCodeFromToCurrency($toCurrency)
        ));
    }

    private function getCurrencyCodeFromToCurrency($toCurrency)
    {
        if (is_string($toCurrency)) {
            $code = $toCurrency;
        } elseif ($toCurrency instanceof \Magento\Directory\Model\Currency) {
            $code = $toCurrency->getCurrencyCode();
        } else {
            throw new InputException(__('Please correct the target currency.'));
        }
        return $code;
    }

    public function getFilter()
    {
        if (!$this->_filter) {
            $this->_filter = $this->_currencyFilterFactory->create(['code' => $this->getCode()]);
        }

        return $this->_filter;
    }

    public function format($price, $options = [], $includeContainer = true, $addBrackets = false)
    {
        return $this->formatPrecision($price, 2, $options, $includeContainer, $addBrackets);
    }

    public function formatPrecision(
        $price,
        $precision,
        $options = [],
        $includeContainer = true,
        $addBrackets = false
    ) {
        if (!isset($options['precision'])) {
            $options['precision'] = $precision;
        }
        if ($includeContainer) {
            return '<span class="price">' . ($addBrackets ? '[' : '') . $this->formatTxt(
                $price,
                $options
            ) . ($addBrackets ? ']' : '') . '</span>';
        }
        return $this->formatTxt($price, $options);
    }

    public function formatTxt($price, $options = [])
    {
        if (!is_numeric($price)) {
            $price = $this->_localeFormat->getNumber($price);
        }
        $price = sprintf("%F", $price);
        return $this->_localeCurrency->getCurrency($this->getCode())->toCurrency($price, $options);
    }

    public function getCurrencySymbol()
    {
        return $this->_localeCurrency->getCurrency($this->getCode())->getSymbol();
    }

    public function getOutputFormat()
    {
        $formatted = $this->formatTxt(0);
        $number = $this->formatTxt(0, ['display' => \Magento\Framework\Currency::NO_SYMBOL]);
        return str_replace($this->trimUnicodeDirectionMark($number), '%s', $formatted);
    }

    public function getConfigAllowCurrencies()
    {
        $allowedCurrencies = $this->currencyConfig->getConfigCurrencies(self::XML_PATH_CURRENCY_ALLOW);
        $appBaseCurrencyCode = $this->_directoryHelper->getBaseCurrencyCode();
        if (!in_array($appBaseCurrencyCode, $allowedCurrencies)) {
            $allowedCurrencies[] = $appBaseCurrencyCode;
        }
        foreach ($this->_storeManager->getStores() as $store) {
            $code = $store->getBaseCurrencyCode();
            if (!in_array($code, $allowedCurrencies)) {
                $allowedCurrencies[] = $code;
            }
        }

        return $allowedCurrencies;
    }

    public function getConfigDefaultCurrencies()
    {
        return $this->currencyConfig->getConfigCurrencies(self::XML_PATH_CURRENCY_DEFAULT);
    }

    public function getConfigBaseCurrencies()
    {
        return $this->currencyConfig->getConfigCurrencies(self::XML_PATH_CURRENCY_BASE);
    }

    public function getCurrencyRates($currency, $toCurrencies = null)
    {
        if ($currency instanceof \Magento\Directory\Model\Currency) {
            $currency = $currency->getCode();
        }
        $data = $this->_getResource()->getCurrencyRates($currency, $toCurrencies);
        return $data;
    }

    public function saveRates($rates)
    {
        $this->_getResource()->saveRates($rates);
        return $this;
    }

    private function trimUnicodeDirectionMark($string)
    {
        if (preg_match('/^(\x{200E}|\x{200F})/u', $string, $match)) {
            $string = preg_replace('/^'.$match[1].'/u', '', $string);
        }
        return $string;
    }
}