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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Catalog\Model\Product\Attribute\Backend;

use \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface;
use Magento\Catalog\Model\Attribute\ScopeOverriddenValue;

/**
 * Backend model for set of EAV attributes with 'frontend_input' equals 'price'.
 *
 * @api
 *
 * @author     Magento Core Team <[email protected]>
 * @since 100.0.2
 */
class Price extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
{
    /**
     * Catalog helper
     *
     * @var \Magento\Catalog\Helper\Data
     */
    protected $_helper;

    /**
     * Store manager
     *
     * @var \Magento\Store\Model\StoreManagerInterface
     */
    protected $_storeManager;

    /**
     * Currency factory
     *
     * @var \Magento\Directory\Model\CurrencyFactory
     */
    protected $_currencyFactory;

    /**
     * Core config model
     *
     * @var \Magento\Framework\App\Config\ScopeConfigInterface
     */
    protected $_config;

    /**
     * @var \Magento\Framework\Locale\FormatInterface
     */
    protected $localeFormat;

    /**
     * @var \Magento\Catalog\Model\Attribute\ScopeOverriddenValue
     */
    private $scopeOverriddenValue;

    /**
     * @param \Magento\Directory\Model\CurrencyFactory $currencyFactory
     * @param \Magento\Store\Model\StoreManagerInterface $storeManager
     * @param \Magento\Catalog\Helper\Data $catalogData
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $config
     * @param \Magento\Framework\Locale\FormatInterface $localeFormat
     * @param ScopeOverriddenValue|null $scopeOverriddenValue
     */
    public function __construct(
        \Magento\Directory\Model\CurrencyFactory $currencyFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Catalog\Helper\Data $catalogData,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\Locale\FormatInterface $localeFormat,
        ScopeOverriddenValue $scopeOverriddenValue = null
    ) {
        $this->_currencyFactory = $currencyFactory;
        $this->_storeManager = $storeManager;
        $this->_helper = $catalogData;
        $this->_config = $config;
        $this->localeFormat = $localeFormat;
        $this->scopeOverriddenValue = $scopeOverriddenValue
            ?: \Magento\Framework\App\ObjectManager::getInstance()->get(ScopeOverriddenValue::class);
    }

    /**
     * Set Attribute instance
     * Rewrite for redefine attribute scope
     *
     * @param \Magento\Catalog\Model\ResourceModel\Eav\Attribute $attribute
     * @return $this
     */
    public function setAttribute($attribute)
    {
        parent::setAttribute($attribute);
        $this->setScope($attribute);
        return $this;
    }

    /**
     * Redefine Attribute scope
     *
     * @param \Magento\Catalog\Model\ResourceModel\Eav\Attribute $attribute
     * @return $this
     */
    public function setScope($attribute)
    {
        if ($this->_helper->isPriceGlobal()) {
            $attribute->setIsGlobal(ScopedAttributeInterface::SCOPE_GLOBAL);
        } else {
            $attribute->setIsGlobal(ScopedAttributeInterface::SCOPE_WEBSITE);
        }

        return $this;
    }

    /**
     * After Save Price Attribute manipulation
     * Processes product price attributes if price scoped to website and updates data when:
     * * Price changed for non-default store view - will update price for all stores assigned to current website.
     * * Price will be changed according to store currency even if price changed in product with default store id.
     * * In a case when price was removed for non-default store (use default option checked) the default store price
     * * will be used instead
     *
     * @param \Magento\Catalog\Model\Product $object
     * @return $this
     */
    public function afterSave($object)
    {
        /** @var $attribute \Magento\Catalog\Model\ResourceModel\Eav\Attribute */
        $attribute = $this->getAttribute();
        $attributeCode = $attribute->getAttributeCode();
        $value = $object->getData($attributeCode);
        // $value may be passed as null to unset the attribute
        if ($value === null || (float)$value > 0) {
            if ($attribute->isScopeWebsite() && $object->getStoreId() != \Magento\Store\Model\Store::DEFAULT_STORE_ID) {
                if ($this->isUseDefault($object)) {
                    $value = null;
                }
                foreach ((array)$object->getWebsiteStoreIds() as $storeId) {
                    $object->addAttributeUpdate($attributeCode, $value, $storeId);
                }
            }
        }

        return $this;
    }

    /**
     * Check whether product uses default attribute's value in selected scope
     * @param \Magento\Catalog\Model\Product $object
     * @return bool
     */
    private function isUseDefault($object)
    {
        $overridden = $this->scopeOverriddenValue->containsValue(
            \Magento\Catalog\Api\Data\ProductInterface::class,
            $object,
            $this->getAttribute()->getAttributeCode(),
            $object->getStoreId()
        );
        return !$overridden;
    }

    /**
     * Validate
     *
     * @param \Magento\Catalog\Model\Product $object
     * @throws \Magento\Framework\Exception\LocalizedException
     * @return bool
     */
    public function validate($object)
    {
        $value = $object->getData($this->getAttribute()->getAttributeCode());
        if (empty($value)) {
            return parent::validate($object);
        }

        if (!$this->isPositiveOrZero($value)) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('Please enter a number 0 or greater in this field.')
            );
        }

        return true;
    }

    /**
     * Returns whether the value is greater than, or equal to, zero
     *
     * @param mixed $value
     * @return bool
     */
    protected function isPositiveOrZero($value)
    {
        $value = $this->localeFormat->getNumber($value);
        $isNegative = $value < 0;
        return  !$isNegative;
    }
}