<?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 2.1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CUBRID Forge Class
 *
 * @category	Database
 * @author		Esen Sagynov
 * @link		https://codeigniter.com/user_guide/database/
 */
class CI_DB_cubrid_forge extends CI_DB_forge {

    /**
     * CREATE DATABASE statement
     *
     * @var	string
     */
    protected $_create_database = FALSE;

    /**
     * CREATE TABLE keys flag
     *
     * Whether table keys are created from within the
     * CREATE TABLE statement.
     *
     * @var	bool
     */
    protected $_create_table_keys = TRUE;

    /**
     * DROP DATABASE statement
     *
     * @var	string
     */
    protected $_drop_database = FALSE;

    /**
     * CREATE TABLE IF statement
     *
     * @var	string
     */
    protected $_create_table_if = FALSE;

    /**
     * UNSIGNED support
     *
     * @var	array
     */
    protected $_unsigned = array(
        'SHORT' => 'INTEGER',
        'SMALLINT' => 'INTEGER',
        'INT' => 'BIGINT',
        'INTEGER' => 'BIGINT',
        'BIGINT' => 'NUMERIC',
        'FLOAT' => 'DOUBLE',
        'REAL' => 'DOUBLE'
    );

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

    /**
     * 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) {
                $sqls[] = $sql . ' CHANGE ' . $field[$i]['_literal'];
            } else {
                $alter_type = empty($field[$i]['new_name']) ? ' MODIFY ' : ' CHANGE ';
                $sqls[] = $sql . $alter_type . $this->_process_column($field[$i]);
            }
        }

        return $sqls;
    }

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

    /**
     * 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']
                . $extra_clause;
    }

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

    /**
     * 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 'LONGTEXT':
                $attributes['TYPE'] = 'STRING';
                return;
            default: return;
        }
    }

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

    /**
     * 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;
    }

}
