<?php declare(strict_types=1);
/**
 * Query
 *
 * SQL Query Builder / Database Abstraction Layer
 *
 * PHP version 8.1
 *
 * @package     Query
 * @author      Timothy J. Warren <tim@timshome.page>
 * @copyright   2012 - 2023 Timothy J. Warren
 * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link        https://git.timshomepage.net/aviat/Query
 * @version     4.0.0
 */

namespace Query\Drivers\Mysql;

use PDO;
use PHPUnit\Framework\Attributes\CodeCoverageIgnore;
use Query\Drivers\AbstractDriver;
use function defined;

/**
 * MySQL specific class
 */
class Driver extends AbstractDriver
{
	/**
	 * Set the backtick as the MySQL escape character
	 */
	protected string $escapeCharOpen = '`';

	/**
	 * Set the backtick as the MySQL escape character
	 */
	protected string $escapeCharClose = '`';

	/**
	 * Connect to MySQL Database
	 */
	#[CodeCoverageIgnore]
	public function __construct(string $dsn, ?string $username=NULL, ?string $password=NULL, array $options=[])
	{
		// Set the charset to UTF-8
		if (defined('\\PDO::MYSQL_ATTR_INIT_COMMAND'))
		{
			$options = array_merge($options, [
				PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES UTF-8 COLLATE 'UTF-8'",
			]);
		}

		if ( ! str_contains($dsn, 'mysql'))
		{
			$dsn = 'mysql:' . $dsn;
		}

		parent::__construct($dsn, $username, $password, $options);
	}

	/**
	 * Generate the returning clause for the current database
	 */
	public function returning(string $query, string $select): string
	{
		// @TODO add checks for MariaDB for future-proofing
		// MariaDB 10.5.0+ supports the returning clause for insert
		if (
			stripos($query, 'insert') !== FALSE
			&& version_compare($this->getVersion(), '10.5.0', '>=')
		) {
			return parent::returning($query, $select);
		}

		// MariaDB 10.0.5+ supports the returning clause for delete
		if (
			stripos($query, 'delete') !== FALSE
			&& version_compare($this->getVersion(), '10.0.5', '>=')
		) {
			return parent::returning($query, $select);
		}

		// Just return the same SQL if the returning clause is not supported
		return $query;
	}
}
