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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 - 2017, 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 - 2017, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://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');

/**

 * PDO PostgreSQL Forge Class

 *

 * @category	Database

 * @author		EllisLab Dev Team

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

 */

class CI_DB_pdo_pgsql_forge extends CI_DB_pdo_forge {

	/**

	 * DROP TABLE IF statement

	 *

	 * @var	string

	 */

	protected $_drop_table_if	= 'DROP TABLE IF EXISTS';

	/**

	 * UNSIGNED support

	 *

	 * @var	array

	 */

	protected $_unsigned		= array(

		'INT2'		=> 'INTEGER',

		'SMALLINT'	=> 'INTEGER',

		'INT'		=> 'BIGINT',

		'INT4'		=> 'BIGINT',

		'INTEGER'	=> 'BIGINT',

		'INT8'		=> 'NUMERIC',

		'BIGINT'	=> 'NUMERIC',

		'REAL'		=> 'DOUBLE PRECISION',

		'FLOAT'		=> 'DOUBLE PRECISION'

	);

	/**

	 * NULL value representation in CREATE/ALTER TABLE statements

	 *

	 * @var	string

	 */

	protected $_null = 'NULL';

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

	/**

	 * Class constructor

	 *

	 * @param	object	&$db	Database object

	 * @return	void

	 */

	public function __construct(&$db)

	{

		parent::__construct($db);

		if (version_compare($this->db->version(), '9.0', '>'))

		{

			$this->create_table_if = 'CREATE TABLE IF NOT EXISTS';

		}

	}

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

	/**

	 * 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 (version_compare($this->db->version(), '8', '>=') && isset($field[$i]['type']))

			{

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

					.($field[$i]['null'] === TRUE ? ' DROP NOT NULL' : ' SET NOT NULL');

			}

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

			{

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

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

			}

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

			{

				$sqls[] = 'COMMENT ON COLUMN '

					.$this->db->escape_identifiers($table).'.'.$this->db->escape_identifiers($field[$i]['name'])

					.' IS '.$field[$i]['comment'];

			}

		}

		return $sqls;

 	}

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

	/**

	 * Field attribute TYPE

	 *

	 * Performs a data type mapping between different databases.

	 *

	 * @param	array	&$attributes

	 * @return	void

	 */

	protected function _attr_type(&$attributes)

	{

		// Reset field lengths for data types that don't support it

		if (isset($attributes['CONSTRAINT']) && stripos($attributes['TYPE'], 'int') !== FALSE)

		{

			$attributes['CONSTRAINT'] = NULL;

		}

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

		{

			case 'TINYINT':

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

				$attributes['UNSIGNED'] = FALSE;

				return;

			case 'MEDIUMINT':

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

				$attributes['UNSIGNED'] = FALSE;

				return;

			default: return;

		}

	}

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

	/**

	 * Field attribute AUTO_INCREMENT

	 *

	 * @param	array	&$attributes

	 * @param	array	&$field

	 * @return	void

	 */

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

	{

		if ( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE)

		{

			$field['type'] = ($field['type'] === 'NUMERIC')

				? 'BIGSERIAL'

				: 'SERIAL';

		}

	}

}