<?php
/**
 * Copyright © 2016 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\Framework\EntityManager\Db;

use Magento\Framework\EntityManager\MetadataPool;
use Magento\Framework\EntityManager\EntityMetadataInterface;
use Magento\Framework\DB\Adapter\AdapterInterface;
use Magento\Framework\App\ResourceConnection;

/**
 * Class UpdateRow
 */
class UpdateRow
{
    /**
     * @var MetadataPool
     */
    private $metadataPool;

    /**
     * @var ResourceConnection
     */
    private $resourceConnection;

    /**
     * CreateRow constructor.
     *
     * @param MetadataPool $metadataPool
     * @param ResourceConnection $resourceConnection
     */
    public function __construct(
        MetadataPool $metadataPool,
        ResourceConnection $resourceConnection
    ) {
        $this->metadataPool = $metadataPool;
        $this->resourceConnection = $resourceConnection;
    }

    /**
     * @param EntityMetadataInterface $metadata
     * @param AdapterInterface $connection
     * @param array $data
     * @return array
     */
    protected function prepareData(EntityMetadataInterface $metadata, AdapterInterface $connection, $data)
    {
        $output = [];
        foreach ($connection->describeTable($metadata->getEntityTable()) as $column) {
            if ($column['DEFAULT'] == 'CURRENT_TIMESTAMP' || $column['IDENTITY']) {
                continue;
            }

            if (isset($data[strtolower($column['COLUMN_NAME'])])) {
                $output[strtolower($column['COLUMN_NAME'])] = $data[strtolower($column['COLUMN_NAME'])];
            } elseif (!empty($column['NULLABLE'])) {
                $output[strtolower($column['COLUMN_NAME'])] = null;
            }
        }
        if (empty($data[$metadata->getIdentifierField()])) {
            $output[$metadata->getIdentifierField()] = $metadata->generateIdentifier();
        }

        return $output;
    }

    /**
     * @param string $entityType
     * @param array $data
     * @return array
     */
    public function execute($entityType, $data)
    {
        $metadata = $this->metadataPool->getMetadata($entityType);
        $connection = $this->resourceConnection->getConnectionByName($metadata->getEntityConnectionName());
        $connection->update(
            $metadata->getEntityTable(),
            $this->prepareData($metadata, $connection, $data),
            [$metadata->getLinkField() . ' = ?' => $data[$metadata->getLinkField()]]
        );
        return $data;
    }
}