PriceCurrency.php

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<?php
namespace Magento\Directory\Model;

use Magento\Framework\App\ScopeInterface;
use Magento\Store\Model\StoreManagerInterface;
use Psr\Log\LoggerInterface as Logger;
use Magento\Store\Model\Store;

class PriceCurrency implements \Magento\Framework\Pricing\PriceCurrencyInterface
{
    protected $storeManager;

    protected $currencyFactory;

    protected $logger;

    public function __construct(
        StoreManagerInterface $storeManager,
        CurrencyFactory $currencyFactory,
        Logger $logger
    ) {
        $this->storeManager = $storeManager;
        $this->currencyFactory = $currencyFactory;
        $this->logger = $logger;
    }

    public function convert($amount, $scope = null, $currency = null)
    {
        $currentCurrency = $this->getCurrency($scope, $currency);

        return $this->getStore($scope)
            ->getBaseCurrency()
            ->convert($amount, $currentCurrency);
    }

    public function convertAndRound($amount, $scope = null, $currency = null, $precision = self::DEFAULT_PRECISION)
    {
        $currentCurrency = $this->getCurrency($scope, $currency);
        $convertedValue = $this->getStore($scope)->getBaseCurrency()->convert($amount, $currentCurrency);
        return round($convertedValue, $precision);
    }

    public function format(
        $amount,
        $includeContainer = true,
        $precision = self::DEFAULT_PRECISION,
        $scope = null,
        $currency = null
    ) {
        return $this->getCurrency($scope, $currency)
            ->formatPrecision($amount, $precision, [], $includeContainer);
    }

    public function convertAndFormat(
        $amount,
        $includeContainer = true,
        $precision = self::DEFAULT_PRECISION,
        $scope = null,
        $currency = null
    ) {
        $amount = $this->convert($amount, $scope, $currency);

        return $this->format($amount, $includeContainer, $precision, $scope, $currency);
    }

    public function getCurrency($scope = null, $currency = null)
    {
        if ($currency instanceof Currency) {
            $currentCurrency = $currency;
        } elseif (is_string($currency)) {
            $currency = $this->currencyFactory->create()
                ->load($currency);
            $baseCurrency = $this->getStore($scope)
                ->getBaseCurrency();
            $currentCurrency = $baseCurrency->getRate($currency) ? $currency : $baseCurrency;
        } else {
            $currentCurrency = $this->getStore($scope)
                ->getCurrentCurrency();
        }

        return $currentCurrency;
    }

    public function getCurrencySymbol($scope = null, $currency = null)
    {
        return $this->getCurrency($scope, $currency)->getCurrencySymbol();
    }

    protected function getStore($scope = null)
    {
        try {
            if (!$scope instanceof Store) {
                $scope = $this->storeManager->getStore($scope);
            }
        } catch (\Exception $e) {
            $this->logger->critical($e);
            $scope = $this->storeManager->getStore();
        }

        return $scope;
    }

    public function round($price)
    {
        return round($price, 2);
    }
}