<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\Locale;

class Currency implements \Magento\Framework\Locale\CurrencyInterface
{
/**
* Default currency
*/
const DEFAULT_CURRENCY = 'USD';

/**#@+
* Currency Options
*/
const CURRENCY_OPTION_SYMBOL = 'symbol';

const CURRENCY_OPTION_CURRENCY = 'currency';

const CURRENCY_OPTION_NAME = 'name';

const CURRENCY_OPTION_DISPLAY = 'display';

/**
* @var array
*/
protected static $_currencyCache = [];

/**
* Core event manager proxy
*
* @var \Magento\Framework\Event\ManagerInterface
*/
protected $_eventManager = null;

/**
* @var \Magento\Framework\Locale\ResolverInterface
*/
protected $_localeResolver;

/**
* @var \Magento\Framework\CurrencyFactory
*/
protected $_currencyFactory;

/**
* @param \Magento\Framework\Event\ManagerInterface $eventManager
* @param ResolverInterface $localeResolver
* @param \Magento\Framework\CurrencyFactory $currencyFactory
*/
public function __construct(
\Magento\Framework\Event\ManagerInterface $eventManager,
\Magento\Framework\Locale\ResolverInterface $localeResolver,
\Magento\Framework\CurrencyFactory $currencyFactory
) {
$this->_eventManager = $eventManager;
$this->_localeResolver = $localeResolver;
$this->_currencyFactory = $currencyFactory;
}

/**
* @inheritdoc
*/
public function getDefaultCurrency()
{
return self::DEFAULT_CURRENCY;
}

/**
* @inheritdoc
*/
public function getCurrency($currency)
{
\Magento\Framework\Profiler::start('locale/currency');
if (!isset(self::$_currencyCache[$this->_localeResolver->getLocale()][$currency])) {
$options = [];
try {
$currencyObject = $this->_currencyFactory->create(
['options' => $currency, 'locale' => $this->_localeResolver->getLocale()]
);
} catch (\Exception $e) {
$currencyObject = $this->_currencyFactory->create(
['options' => $this->getDefaultCurrency(), 'locale' => $this->_localeResolver->getLocale()]
);
$options[self::CURRENCY_OPTION_NAME] = $currency;
$options[self::CURRENCY_OPTION_CURRENCY] = $currency;
$options[self::CURRENCY_OPTION_SYMBOL] = $currency;
}

$options = new \Magento\Framework\DataObject($options);
$this->_eventManager->dispatch(
'currency_display_options_forming',
['currency_options' => $options, 'base_code' => $currency]
);

$currencyObject->setFormat($options->toArray());
self::$_currencyCache[$this->_localeResolver->getLocale()][$currency] = $currencyObject;
}
\Magento\Framework\Profiler::stop('locale/currency');
return self::$_currencyCache[$this->_localeResolver->getLocale()][$currency];
}
}