<?php

namespace CleantalkSP\Common;

/**
 * CleanTalk abstract Data Base driver.
 * Shows what should be inside.
 * Uses singleton pattern.
 *
 * @version 2.0
 * @author Cleantalk team (welcome@cleantalk.org)
 * @copyright (C) 2014 CleanTalk team (http://cleantalk.org)
 * @license GNU/GPL: http://www.gnu.org/copyleft/gpl.html
 * @see https://github.com/CleanTalk/php-antispam
 */
abstract class DB
{
    /**
     * @var string Query string
     * @psalm-suppress UnusedProperty
     */
    private $query;

    /**
     * @var array Processed result
     * @psalm-suppress PossiblyUnusedProperty
     */
    public $result = array();

    /**
     * @var string Database prefix
     * @psalm-suppress PossiblyUnusedProperty
     */
    public $prefix = '';

    /**
     * Set $this->query string for next uses
     *
     * @param $query
     *
     * @psalm-suppress PossiblyUnusedMethod
     */
    abstract public function setQuery($query);

    /**
     * Safely replace place holders
     *
     * @param string $query
     * @param array $vars
     */
    abstract public function prepare($query, $vars = array());

    /**
     * Run any raw request
     *
     * @param $query
     *
     * @return bool|int Raw result
     */
    abstract public function execute($query);

    /**
     * Fetches first column from query.
     * May receive raw or prepared query.
     *
     * @param string|boolean $query
     * @param string|boolean $response_type
     */
    abstract public function fetch($query = false, $response_type = false);

    /**
     * Fetches all result from query.
     * May receive raw or prepared query.
     *
     * @param string|boolean $query
     * @param string|boolean $response_type
     */
    abstract public function fetchAll($query = false, $response_type = false);

    /**
     * Checks if the table exists
     *
     * @param $table_name
     *
     * @return bool
     */
    public function isTableExists($table_name)
    {
        $table_name = preg_replace('/[^a-zA-Z0-9_]/', '', (string) $table_name);
        return (bool) $this->execute('SHOW TABLES LIKE "' . $table_name . '"');
    }
}