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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2019, 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	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)

 * @license	https://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 3.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * Interbase/Firebird Forge Class

 *

 * @category	Database

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/database/

 */

class CI_DB_ibase_forge extends CI_DB_forge {

	/**

	 * CREATE TABLE IF statement

	 *

	 * @var	string

	 */

	protected $_create_table_if	= FALSE;

	/**

	 * RENAME TABLE statement

	 *

	 * @var	string

	 */

	protected $_rename_table	= FALSE;

	/**

	 * DROP TABLE IF statement

	 *

	 * @var	string

	 */

	protected $_drop_table_if	= FALSE;

	/**

	 * UNSIGNED support

	 *

	 * @var	array

	 */

	protected $_unsigned		= array(

		'SMALLINT'	=> 'INTEGER',

		'INTEGER'	=> 'INT64',

		'FLOAT'		=> 'DOUBLE PRECISION'

	);

	/**

	 * NULL value representation in CREATE/ALTER TABLE statements

	 *

	 * @var	string

	 */

	protected $_null		= 'NULL';

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

	/**

	 * Create database

	 *

	 * @param	string	$db_name

	 * @return	bool

	 */

	public function create_database($db_name)

	{

		// Firebird databases are flat files, so a path is required

		// Hostname is needed for remote access

		empty($this->db->hostname) OR $db_name = $this->hostname.':'.$db_name;

		return parent::create_database('"'.$db_name.'"');

	}

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

	/**

	 * Drop database

	 *

	 * @param	string	$db_name	(ignored)

	 * @return	bool

	 */

	public function drop_database($db_name)

	{

		if ( ! ibase_drop_db($this->conn_id))

		{

			return ($this->db->db_debug) ? $this->db->display_error('db_unable_to_drop') : FALSE;

		}

		elseif ( ! empty($this->db->data_cache['db_names']))

		{

			$key = array_search(strtolower($this->db->database), array_map('strtolower', $this->db->data_cache['db_names']), TRUE);

			if ($key !== FALSE)

			{

				unset($this->db->data_cache['db_names'][$key]);

			}

		}

		return TRUE;

	}

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

	/**

	 * ALTER TABLE

	 *

	 * @param	string	$alter_type	ALTER type

	 * @param	string	$table		Table name

	 * @param	mixed	$field		Column definition

	 * @return	string|string[]

	 */

	protected function _alter_table($alter_type, $table, $field)

 	{

		if (in_array($alter_type, array('DROP', 'ADD'), TRUE))

		{

			return parent::_alter_table($alter_type, $table, $field);

		}

		$sql = 'ALTER TABLE '.$this->db->escape_identifiers($table);

		$sqls = array();

		for ($i = 0, $c = count($field); $i < $c; $i++)

		{

			if ($field[$i]['_literal'] !== FALSE)

			{

				return FALSE;

			}

			if (isset($field[$i]['type']))

			{

				$sqls[] = $sql.' ALTER COLUMN '.$this->db->escape_identififers($field[$i]['name'])

					.' TYPE '.$field[$i]['type'].$field[$i]['length'];

			}

			if ( ! empty($field[$i]['default']))

			{

				$sqls[] = $sql.' ALTER COLUMN '.$this->db->escape_identifiers($field[$i]['name'])

					.' SET DEFAULT '.$field[$i]['default'];

			}

			if (isset($field[$i]['null']))

			{

				$sqls[] = 'UPDATE "RDB$RELATION_FIELDS" SET "RDB$NULL_FLAG" = '

					.($field[$i]['null'] === TRUE ? 'NULL' : '1')

					.' WHERE "RDB$FIELD_NAME" = '.$this->db->escape($field[$i]['name'])

					.' AND "RDB$RELATION_NAME" = '.$this->db->escape($table);

			}

			if ( ! empty($field[$i]['new_name']))

			{

				$sqls[] = $sql.' ALTER COLUMN '.$this->db->escape_identifiers($field[$i]['name'])

					.' TO '.$this->db->escape_identifiers($field[$i]['new_name']);

			}

		}

		return $sqls;

 	}

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

	/**

	 * Process column

	 *

	 * @param	array	$field

	 * @return	string

	 */

	protected function _process_column($field)

	{

		return $this->db->escape_identifiers($field['name'])

			.' '.$field['type'].$field['length']

			.$field['null']

			.$field['unique']

			.$field['default'];

	}

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

	/**

	 * Field attribute TYPE

	 *

	 * Performs a data type mapping between different databases.

	 *

	 * @param	array	&$attributes

	 * @return	void

	 */

	protected function _attr_type(&$attributes)

	{

		switch (strtoupper($attributes['TYPE']))

		{

			case 'TINYINT':

				$attributes['TYPE'] = 'SMALLINT';

				$attributes['UNSIGNED'] = FALSE;

				return;

			case 'MEDIUMINT':

				$attributes['TYPE'] = 'INTEGER';

				$attributes['UNSIGNED'] = FALSE;

				return;

			case 'INT':

				$attributes['TYPE'] = 'INTEGER';

				return;

			case 'BIGINT':

				$attributes['TYPE'] = 'INT64';

				return;

			default: return;

		}

	}

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

	/**

	 * Field attribute AUTO_INCREMENT

	 *

	 * @param	array	&$attributes

	 * @param	array	&$field

	 * @return	void

	 */

	protected function _attr_auto_increment(&$attributes, &$field)

	{

		// Not supported

	}

}