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<?php

/**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 */

namespace PrestaShop\PrestaShop\Core\Localization\Currency\DataLayer;

use PrestaShop\PrestaShop\Core\Data\Layer\AbstractDataLayer;
use PrestaShop\PrestaShop\Core\Localization\CLDR\CurrencyInterface as CldrCurrency;
use PrestaShop\PrestaShop\Core\Localization\CLDR\LocaleRepository as CldrLocaleRepository;
use PrestaShop\PrestaShop\Core\Localization\Currency\CurrencyData as CurrencyData;
use PrestaShop\PrestaShop\Core\Localization\Currency\CurrencyDataLayerInterface;
use PrestaShop\PrestaShop\Core\Localization\Currency\LocalizedCurrencyId;
use PrestaShop\PrestaShop\Core\Localization\Exception\LocalizationException;

/**
 * Localization/CurrencyReference data layer.
 *
 * Provides reference data for currencies...
 * Data comes from CLDR official data files, and is read only.
 */
class CurrencyReference extends AbstractDataLayer implements CurrencyDataLayerInterface
{
    /**
     * CLDR locale repository.
     *
     * Provides LocaleData objects
     *
     * @var CldrLocaleRepository
     */
    protected $cldrLocaleRepository;

    public function __construct(CldrLocaleRepository $cldrLocaleRepository)
    {
        $this->cldrLocaleRepository = $cldrLocaleRepository;
        $this->isWritable = false;
    }

    /**
     * {@inheritdoc}
     */
    public function setLowerLayer(CurrencyDataLayerInterface $lowerLayer)
    {
        $this->lowerDataLayer = $lowerLayer;

        return $this;
    }

    /**
     * Actually read a CurrencyData object into the current layer.
     *
     * Data is read from official CLDR files (via the CLDR LocaleRepository)
     *
     * @param LocalizedCurrencyId $currencyDataId
     *                                            The CurrencyData object identifier
     *
     * @return CurrencyData|null
     *                           The wanted CurrencyData object (null if not found)
     *
     * @throws LocalizationException
     *                               In case of invalid $currencyDataId
     *                               Also in case of invalid type asked for symbol (but use a constant, so it is very unlikely...)
     */
    protected function doRead($currencyDataId)
    {
        if (!$currencyDataId instanceof LocalizedCurrencyId) {
            throw new LocalizationException('$currencyDataId must be a CurrencyDataIdentifier object');
        }

        $localeCode = $currencyDataId->getLocaleCode();
        $cldrLocale = $this->cldrLocaleRepository->getLocale($localeCode);

        if (empty($cldrLocale)) {
            return null;
        }

        $cldrCurrency = $cldrLocale->getCurrency($currencyDataId->getCurrencyCode());

        if (empty($cldrCurrency)) {
            return null;
        }

        $currencyData = new CurrencyData();
        $currencyData->setIsoCode($cldrCurrency->getIsoCode());
        $currencyData->setNumericIsoCode($cldrCurrency->getNumericIsoCode());
        $currencyData->setSymbols([$localeCode => $cldrCurrency->getSymbol(CldrCurrency::SYMBOL_TYPE_NARROW)]);
        $currencyData->setPrecision($cldrCurrency->getDecimalDigits());
        $currencyData->setNames([$localeCode => $cldrCurrency->getDisplayName()]);

        return $currencyData;
    }

    /**
     * CLDR files are read only. Nothing can be written there.
     *
     * @param LocalizedCurrencyId $currencyDataId
     *                                            The LocaleData object identifier
     * @param CurrencyData $currencyData
     *                                   The CurrencyData object to be written
     */
    protected function doWrite($currencyDataId, $currencyData)
    {
        // Nothing.
    }
}