<?php
/**
 * FuzeWorks.
 *
 * The FuzeWorks MVC PHP FrameWork
 *
 * Copyright (C) 2015   TechFuze
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author    TechFuze
 * @copyright Copyright (c) 2013 - 2016, Techfuze. (http://techfuze.net)
 * @copyright Copyright (c) 1996 - 2015, Free Software Foundation, Inc. (http://www.fsf.org/)
 * @license   http://opensource.org/licenses/GPL-3.0 GPLv3 License
 *
 * @link  http://fuzeworks.techfuze.net
 * @since Version 0.0.1
 *
 * @version Version 0.0.1
 */

namespace Module\Database;

use FuzeWorks\Module;
use FuzeWorks\Config;
use FuzeWorks\Logger;
use FuzeWorks\Events;
use FuzeWorks\EventPriority;
use PDO;
use FuzeWorks\DatabaseException;

/**
 * Database Class.
 *
 * This class is a wrapper for PDO.
 *
 * @author    Abel Hoogeveen <abel@techfuze.net>
 * @copyright Copyright (c) 2013 - 2016, Techfuze. (http://techfuze.net)
 */
class Main
{
    use Module;

    /**
     * The default database connection.
     *
     * @var PDO Class
     */
    private $DBH;
    public $prefix;

    public function onLoad()
    {
        Config::$dbActive = true;
        Events::addListener(array($this, 'shutdown'), 'coreShutdownEvent', EventPriority::NORMAL);
    }

    /**
     * Connect to a database.
     *
     * @param StdObject Config, like the database config in Application/Config
     */
    public function connect($config = null)
    {
        // If nothing is given, connect to database from the main config, otherwise use the served configuration
        if (is_null($config)) {
            $db = Config::get('database');
        } else {
            $db = $config;
        }

        if (empty($db->type) || empty($db->host)) {
            throw (new DatabaseException('Database is not configured!'));
        }

        // Get the DSN for popular types of databases or a custom DSN
        switch (strtolower($db->type)) {
            case 'mysql':
                $dsn = 'mysql:host='.$db->host.';';
                $dsn .= (!empty($db->database) ? 'dbname='.$db->database.';' : '');
                break;
            case 'custom':
                $dsn = $db->dsn;
                break;
        }

        try {
            Logger::logInfo("Connecting to '".$dsn."'", 'Database');
            // And create the connection
            $this->DBH = new PDO($dsn, $db->username, $db->password, (isset($db->options) ? $db->options : null));
            $this->DBH->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            Logger::logInfo('Connected to database', 'Database');

            // And set the prefix
            $this->prefix = $db->prefix;
        } catch (Exception $e) {
            throw (new DatabaseException('Could not connect to the database: "'.$e->getMessage().'"'));
        }
    }

    public function shutdown()
    {
        Logger::log('Closing open database connections');
        $this->DBH = null;
    }

    public function getPrefix()
    {
        if (!$this->is_active()) {
            $this->connect();
        }

        return $this->prefix;
    }

    public function is_active()
    {
        if ($this->DBH === null) {
            return false;
        } else {
            return true;
        }
    }

    public function __call($name, $params)
    {
        if ($this->is_active()) {
            return call_user_func_array(array($this->DBH, $name), $params);
        } else {
            $this->connect();

            return call_user_func_array(array($this->DBH, $name), $params);
        }
    }

    public function __get($name)
    {
        if ($this->is_active()) {
            return $this->DBH->$name;
        } else {
            $this->connect();

            return $this->DBH->$name;
        }
    }

    public function __set($name, $value)
    {
        if ($this->is_active()) {
            $this->DBH->$name = $value;
        } else {
            $this->connect();
            $this->DBH->$name = $value;
        }
    }
}