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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 - 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	EllisLab Dev Team

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

 * @copyright	Copyright (c) 2014 - 2016, 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 MySQL Forge Class

 *

 * @category	Database

 * @author		EllisLab Dev Team

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

 */

class CI_DB_pdo_mysql_forge extends CI_DB_pdo_forge {

	/**

	 * CREATE DATABASE statement

	 *

	 * @var	string

	 */

	protected $_create_database	= 'CREATE DATABASE %s CHARACTER SET %s COLLATE %s';

	/**

	 * CREATE TABLE IF statement

	 *

	 * @var	string

	 */

	protected $_create_table_if	= 'CREATE TABLE IF NOT EXISTS';

	/**

	 * CREATE TABLE keys flag

	 *

	 * Whether table keys are created from within the

	 * CREATE TABLE statement.

	 *

	 * @var	bool

	 */

	protected $_create_table_keys	= TRUE;

	/**

	 * DROP TABLE IF statement

	 *

	 * @var	string

	 */

	protected $_drop_table_if	= 'DROP TABLE IF EXISTS';

	/**

	 * UNSIGNED support

	 *

	 * @var	array

	 */

	protected $_unsigned		= array(

		'TINYINT',

		'SMALLINT',

		'MEDIUMINT',

		'INT',

		'INTEGER',

		'BIGINT',

		'REAL',

		'DOUBLE',

		'DOUBLE PRECISION',

		'FLOAT',

		'DECIMAL',

		'NUMERIC'

	);

	/**

	 * NULL value representation in CREATE/ALTER TABLE statements

	 *

	 * @var	string

	 */

	protected $_null = 'NULL';

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

	/**

	 * CREATE TABLE attributes

	 *

	 * @param	array	$attributes	Associative array of table attributes

	 * @return	string

	 */

	protected function _create_table_attr($attributes)

	{

		$sql = '';

		foreach (array_keys($attributes) as $key)

		{

			if (is_string($key))

			{

				$sql .= ' '.strtoupper($key).' = '.$attributes[$key];

			}

		}

		if ( ! empty($this->db->char_set) && ! strpos($sql, 'CHARACTER SET') && ! strpos($sql, 'CHARSET'))

		{

			$sql .= ' DEFAULT CHARACTER SET = '.$this->db->char_set;

		}

		if ( ! empty($this->db->dbcollat) && ! strpos($sql, 'COLLATE'))

		{

			$sql .= ' COLLATE = '.$this->db->dbcollat;

		}

		return $sql;

	}

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

	/**

	 * 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 ($alter_type === 'DROP')

		{

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

		}

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

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

		{

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

			{

				$field[$i] = ($alter_type === 'ADD')

						? "\n\tADD ".$field[$i]['_literal']

						: "\n\tMODIFY ".$field[$i]['_literal'];

			}

			else

			{

				if ($alter_type === 'ADD')

				{

					$field[$i]['_literal'] = "\n\tADD ";

				}

				else

				{

					$field[$i]['_literal'] = empty($field[$i]['new_name']) ? "\n\tMODIFY " : "\n\tCHANGE ";

				}

				$field[$i] = $field[$i]['_literal'].$this->_process_column($field[$i]);

			}

		}

		return array($sql.implode(',', $field));

	}

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

	/**

	 * Process column

	 *

	 * @param	array	$field

	 * @return	string

	 */

	protected function _process_column($field)

	{

		$extra_clause = isset($field['after'])

			? ' AFTER '.$this->db->escape_identifiers($field['after']) : '';

		if (empty($extra_clause) && isset($field['first']) && $field['first'] === TRUE)

		{

			$extra_clause = ' FIRST';

		}

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

			.(empty($field['new_name']) ? '' : ' '.$this->db->escape_identifiers($field['new_name']))

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

			.$field['unsigned']

			.$field['null']

			.$field['default']

			.$field['auto_increment']

			.$field['unique']

			.(empty($field['comment']) ? '' : ' COMMENT '.$field['comment'])

			.$extra_clause;

	}

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

	/**

	 * Process indexes

	 *

	 * @param	string	$table	(ignored)

	 * @return	string

	 */

	protected function _process_indexes($table)

	{

		$sql = '';

		for ($i = 0, $c = count($this->keys); $i < $c; $i++)

		{

			if (is_array($this->keys[$i]))

			{

				for ($i2 = 0, $c2 = count($this->keys[$i]); $i2 < $c2; $i2++)

				{

					if ( ! isset($this->fields[$this->keys[$i][$i2]]))

					{

						unset($this->keys[$i][$i2]);

						continue;

					}

				}

			}

			elseif ( ! isset($this->fields[$this->keys[$i]]))

			{

				unset($this->keys[$i]);

				continue;

			}

			is_array($this->keys[$i]) OR $this->keys[$i] = array($this->keys[$i]);

			$sql .= ",\n\tKEY ".$this->db->escape_identifiers(implode('_', $this->keys[$i]))

				.' ('.implode(', ', $this->db->escape_identifiers($this->keys[$i])).')';

		}

		$this->keys = array();

		return $sql;

	}

}