<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\sphinx;

use yii\base\NotSupportedException;

/**
 * Connection represents the Sphinx connection via MySQL protocol.
 * This class uses [PDO](http://www.php.net/manual/en/ref.pdo.php) to maintain such connection.
 * Note: although PDO supports numerous database drivers, this class supports only MySQL.
 *
 * In order to setup Sphinx "searchd" to support MySQL protocol following configuration should be added:
 * ~~~
 * searchd
 * {
 *     listen = localhost:9306:mysql41
 *     ...
 * }
 * ~~~
 *
 * The following example shows how to create a Connection instance and establish
 * the Sphinx connection:
 * ~~~
 * $connection = new \yii\db\Connection([
 *     'dsn' => 'mysql:host=127.0.0.1;port=9306;',
 *     'username' => $username,
 *     'password' => $password,
 * ]);
 * $connection->open();
 * ~~~
 *
 * After the Sphinx connection is established, one can execute SQL statements like the following:
 * ~~~
 * $command = $connection->createCommand("SELECT * FROM idx_article WHERE MATCH('programming')");
 * $articles = $command->queryAll();
 * $command = $connection->createCommand('UPDATE idx_article SET status=2 WHERE id=1');
 * $command->execute();
 * ~~~
 *
 * For more information about how to perform various DB queries, please refer to [[Command]].
 *
 * This class supports transactions exactly as "yii\db\Connection".
 *
 * Note: while this class extends "yii\db\Connection" some of its methods are not supported.
 *
 * @method \yii\sphinx\Schema getSchema() The schema information for this Sphinx connection
 * @method \yii\sphinx\QueryBuilder getQueryBuilder() the query builder for this Sphinx connection
 *
 * @property string $lastInsertID The row ID of the last row inserted, or the last value retrieved from the
 * sequence object. This property is read-only.
 *
 * @author Paul Klimov <klimov.paul@gmail.com>
 * @since 2.0
 */
class Connection extends \yii\db\Connection
{
	/**
	 * @inheritdoc
	 */
	public $schemaMap = [
		'mysqli' => 'yii\sphinx\Schema',   // MySQL
		'mysql' => 'yii\sphinx\Schema',    // MySQL
	];

	/**
	 * Obtains the schema information for the named index.
	 * @param string $name index name.
	 * @param boolean $refresh whether to reload the table schema even if it is found in the cache.
	 * @return IndexSchema index schema information. Null if the named index does not exist.
	 */
	public function getIndexSchema($name, $refresh = false)
	{
		return $this->getSchema()->getIndexSchema($name, $refresh);
	}

	/**
	 * Quotes a index name for use in a query.
	 * If the index name contains schema prefix, the prefix will also be properly quoted.
	 * If the index name is already quoted or contains special characters including '(', '[[' and '{{',
	 * then this method will do nothing.
	 * @param string $name index name
	 * @return string the properly quoted index name
	 */
	public function quoteIndexName($name)
	{
		return $this->getSchema()->quoteIndexName($name);
	}

	/**
	 * Alias of [[quoteIndexName()]].
	 * @param string $name table name
	 * @return string the properly quoted table name
	 */
	public function quoteTableName($name)
	{
		return $this->quoteIndexName($name);
	}

	/**
	 * Creates a command for execution.
	 * @param string $sql the SQL statement to be executed
	 * @param array $params the parameters to be bound to the SQL statement
	 * @return Command the Sphinx command
	 */
	public function createCommand($sql = null, $params = [])
	{
		$this->open();
		$command = new Command([
			'db' => $this,
			'sql' => $sql,
		]);
		return $command->bindValues($params);
	}

	/**
	 * This method is not supported by Sphinx.
	 * @param string $sequenceName name of the sequence object
	 * @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
	 * @throws \yii\base\NotSupportedException always.
	 */
	public function getLastInsertID($sequenceName = '')
	{
		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
	}
}
