<?php namespace CodeIgniter\Database;

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2016, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	CodeIgniter Dev Team
 * @copyright	Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 3.0.0
 * @filesource
 */

/**
 * Database Connection Factory
 *
 * Creates and returns an instance of the appropriate DatabaseConnection
 *
 * @package CodeIgniter\Database
 */
class Database
{
	/**
	 * Maintains an array of the instances of all connections
	 * that have been created. Helps to keep track of all open
	 * connections for performance monitoring, logging, etc.
	 *
	 * @var array
	 */
	protected $connections = [];

	//--------------------------------------------------------------------

	/**
	 * Parses the connection binds and returns an instance of
	 * the driver ready to go.
	 *
	 * @param array  $params
	 * @param string $alias
	 *
	 * @return mixed
	 * @internal param bool $useBuilder
	 *
	 */
	public function load(array $params = [], string $alias)
	{
		// No DB specified? Beat them senseless...
		if (empty($params['DBDriver']))
		{
			throw new \InvalidArgumentException('You have not selected a database type to connect to.');
		}
		
		$className = strpos($params['DBDriver'], '\\') === false
			? '\CodeIgniter\Database\\'.$params['DBDriver'].'\\Connection'
			: $params['DBDriver'].'\\Connection';

		$class = new $className($params);

		// Store the connection
		$this->connections[$alias] = $class;

		return $this->connections[$alias];
	}

	//--------------------------------------------------------------------

	/**
	 * Creates a new Forge instance for the current database type.
	 *
	 * @param ConnectionInterface $db
	 *
	 * @return mixed
	 */
	public function loadForge(ConnectionInterface $db)
	{
		$className = strpos($db->DBDriver, '\\') === false
			? '\CodeIgniter\Database\\'.$db->DBDriver.'\\Forge'
			: $db->DBDriver.'\\Connection';

		// Make sure a connection exists
		if (! $db->connID)
		{
			$db->initialize();
		}

		$class = new $className($db);

		return $class;
	}

	//--------------------------------------------------------------------

	/**
	 * Loads the Database Utilities class.
	 *
	 * @param ConnectionInterface $db
	 *
	 * @return mixed
	 */
	public function loadUtils(ConnectionInterface $db)
	{
		$className = strpos($db->DBDriver, '\\') === false
			? '\CodeIgniter\Database\\'.$db->DBDriver.'\\Utils'
			: $db->DBDriver.'\\Utils';

		// Make sure a connection exists
		if (! $db->connID)
		{
			$db->initialize();
		}

		$class = new $className($db);

		return $class;
	}

	//--------------------------------------------------------------------


}
