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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 - 2018, 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 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://opensource.org/licenses/MIT      MIT License
 * @link        https://codeigniter.com
 * @since       Version 1.3.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Postgre Forge Class
 *
 * @package             CodeIgniter
 * @subpackage  Drivers
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_postgre_forge extends CI_DB_forge {

        /**
         * 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';
                }
        }

}