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

/**
 * Catalog product links collection
 *
 * @api
 * @author      Magento Core Team <[email protected]>
 * @since 100.0.2
 */
class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    /**
     * Product object
     *
     * @var \Magento\Catalog\Model\Product
     */
    protected $_product;

    /**
     * Product Link model class
     *
     * @var \Magento\Catalog\Model\Product\Link
     */
    protected $_linkModel;

    /**
     * Product Link Type identifier
     *
     * @var \Magento\Catalog\Model\Product\Type
     */
    protected $_linkTypeId;

    /**
     * Resource initialization
     *
     * @return void
     */
    protected function _construct()
    {
        $this->_init(
            \Magento\Catalog\Model\Product\Link::class,
            \Magento\Catalog\Model\ResourceModel\Product\Link::class
        );
    }

    /**
     * Declare link model and initialize type attributes join
     *
     * @param \Magento\Catalog\Model\Product\Link $linkModel
     * @return $this
     */
    public function setLinkModel(\Magento\Catalog\Model\Product\Link $linkModel)
    {
        $this->_linkModel = $linkModel;
        if ($linkModel->hasLinkTypeId()) {
            $this->_linkTypeId = $linkModel->getLinkTypeId();
        }
        return $this;
    }

    /**
     * Retrieve collection link model
     *
     * @return \Magento\Catalog\Model\Product\Link
     */
    public function getLinkModel()
    {
        return $this->_linkModel;
    }

    /**
     * Initialize collection parent product and add limitation join
     *
     * @param \Magento\Catalog\Model\Product $product
     * @return $this
     */
    public function setProduct(\Magento\Catalog\Model\Product $product)
    {
        $this->_product = $product;
        return $this;
    }

    /**
     * Retrieve collection base product object
     *
     * @return \Magento\Catalog\Model\Product
     */
    public function getProduct()
    {
        return $this->_product;
    }

    /**
     * Add link's type to filter
     *
     * @return $this
     */
    public function addLinkTypeIdFilter()
    {
        if ($this->_linkTypeId) {
            $this->addFieldToFilter('link_type_id', ['eq' => $this->_linkTypeId]);
        }
        return $this;
    }

    /**
     * Add product to filter
     *
     * @return $this
     */
    public function addProductIdFilter()
    {
        if ($this->getProduct() && $this->getProduct()->getId()) {
            $this->addFieldToFilter('product_id', ['eq' => $this->getProduct()->getId()]);
        }
        return $this;
    }

    /**
     * Join attributes
     *
     * @return $this
     */
    public function joinAttributes()
    {
        if (!$this->getLinkModel()) {
            return $this;
        }
        $attributes = $this->getLinkModel()->getAttributes();
        $connection = $this->getConnection();
        foreach ($attributes as $attribute) {
            $table = $this->getLinkModel()->getAttributeTypeTable($attribute['type']);
            $alias = sprintf('link_attribute_%s_%s', $attribute['code'], $attribute['type']);

            $aliasInCondition = $connection->quoteColumnAs($alias, null);
            $this->getSelect()->joinLeft(
                [$alias => $table],
                $aliasInCondition .
                '.link_id = main_table.link_id AND ' .
                $aliasInCondition .
                '.product_link_attribute_id = ' .
                (int)$attribute['id'],
                [$attribute['code'] => 'value']
            );
        }

        return $this;
    }
}