<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/

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

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

    /**
    * Create database
    *
    * @access private
    * @param string the database name
    * @return bool
    */
    function _create_database($name)
    {
        return "CREATE DATABASE ".$name;
    }

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

    /**
    * Drop database
    *
    * @access private
    * @param string the database name
    * @return bool
    */
    function _drop_database($name)
    {
        return "DROP DATABASE ".$name;
    }

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

    /**
    * Process Fields
    */
    function _process_fields($fields, $primary_keys=array())
    {
        $sql = '';
        $current_field_count = 0;

        foreach ($fields as $field=>$attributes)
        {
        // Numeric field names aren't allowed in databases, so if the key is
        // numeric, we know it was assigned by PHP and the developer manually
        // entered the field information, so we'll simply add it to the list
            if (is_numeric($field))
            {
                $sql .= "\n\t$attributes";
            }
            else
            {
                $attributes = array_change_key_case($attributes, CASE_UPPER);

                $sql .= "\n\t".$this->db->_protect_identifiers($field);

                $is_unsigned = (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE);

                // Convert datatypes to be PostgreSQL-compatible
                switch (strtoupper($attributes['TYPE']))
                {
                    case 'TINYINT':
                        $attributes['TYPE'] = 'SMALLINT';
                        break;
                    case 'SMALLINT':
                        $attributes['TYPE'] = ($is_unsigned) ? 'INTEGER' : 'SMALLINT';
                        break;
                    case 'MEDIUMINT':
                        $attributes['TYPE'] = 'INTEGER';
                        break;
                    case 'INT':
                        $attributes['TYPE'] = ($is_unsigned) ? 'BIGINT' : 'INTEGER';
                        break;
                    case 'BIGINT':
                        $attributes['TYPE'] = ($is_unsigned) ? 'NUMERIC' : 'BIGINT';
                        break;
                    case 'DOUBLE':
                        $attributes['TYPE'] = 'DOUBLE PRECISION';
                        break;
                    case 'DATETIME':
                        $attributes['TYPE'] = 'TIMESTAMP';
                        break;
                    case 'LONGTEXT':
                        $attributes['TYPE'] = 'TEXT';
                        break;
                    case 'BLOB':
                        $attributes['TYPE'] = 'BYTEA';
                        break;
                }

                // If this is an auto-incrementing primary key, use the serial data type instead
                if (in_array($field, $primary_keys) && array_key_exists('AUTO_INCREMENT', $attributes)
                    && $attributes['AUTO_INCREMENT'] === TRUE)
                {
                    $sql .= ' SERIAL';
                }
                else
                {
                    $sql .= ' '.$attributes['TYPE'];
                }

                // Modified to prevent constraints with integer data types
                if (array_key_exists('CONSTRAINT', $attributes) && strpos($attributes['TYPE'], 'INT') === false)
                {
                    $sql .= '('.$attributes['CONSTRAINT'].')';
                }

                if (array_key_exists('DEFAULT', $attributes))
                {
                    $sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
                }

                if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
                {
                    $sql .= ' NULL';
                }
                else
                {
                    $sql .= ' NOT NULL';
                }

                // Added new attribute to create unqite fields. Also works with MySQL
                if (array_key_exists('UNIQUE', $attributes) && $attributes['UNIQUE'] === TRUE)
                {
                    $sql .= ' UNIQUE';
                }
            }

            // don't add a comma on the end of the last field
            if (++$current_field_count < count($fields))
            {
                $sql .= ',';
            }
        }

        return $sql;
    }

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

    /**
    * Create Table
    *
    * @access private
    * @param string the table name
    * @param array the fields
    * @param mixed primary key(s)
    * @param mixed key(s)
    * @param boolean should 'IF NOT EXISTS' be added to the SQL
    * @return bool
    */
    function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
    {
        $sql = 'CREATE TABLE ';

        if ($if_not_exists === TRUE)
        {
            // PostgreSQL doesn't support IF NOT EXISTS syntax so we check if table exists manually
            if ($this->db->table_exists($table))
            {
                return TRUE;
            }
        }

        $sql .= $this->db->_escape_identifiers($table)." (";
        $sql .= $this->_process_fields($fields, $primary_keys);

        if (count($primary_keys) > 0)
        {
            // Something seems to break when passing an array to _protect_identifiers()
            foreach ($primary_keys as $index => $key)
            {
                $primary_keys[$index] = $this->db->_protect_identifiers($key);
            }

            $sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
        }

        $sql .= "\n);";

        if (is_array($keys) && count($keys) > 0)
        {
            foreach ($keys as $key)
            {
                if (is_array($key))
                {
                    $key = $this->db->_protect_identifiers($key);
                }
                else
                {
                    $key = array($this->db->_protect_identifiers($key));
                }

                foreach ($key as $field)
                {
                    $sql .= "CREATE INDEX " . $table . "_" . str_replace(array('"', "'"), '', $field) . "_index ON $table ($field); ";
                }
            }
        }

    return $sql;
    }

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

    /**
    * Drop Table
    */
    function _drop_table($table)
    {
        return "DROP TABLE IF EXISTS ".$this->db->_escape_identifiers($table)." CASCADE";
    }

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

    /**
    * Alter table query
    *
    * Generates a platform-specific query so that a table can be altered
    * Called by add_column(), drop_column(), and column_alter(),
    *
    * @access private
    * @param string the ALTER type (ADD, DROP, CHANGE)
    * @param string the column name
    * @param string the table name
    * @param string the column definition
    * @param string the default value
    * @param boolean should 'NOT NULL' be added
    * @param string the field after which we should add the new field
    * @return object
    */
    function _alter_table($alter_type, $table, $fields, $after_field = '')
    {
        $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ";

        // DROP has everything it needs now.
        if ($alter_type == 'DROP')
        {
            return $sql.$this->db->_protect_identifiers($fields);
        }

        $sql .= $this->_process_fields($fields);

        if ($after_field != '')
        {
            $sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
        }

    return $sql;
    }

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

    /**
    * Rename a table
    *
    * Generates a platform-specific query so that a table can be renamed
    *
    * @access private
    * @param string the old table name
    * @param string the new table name
    * @return string
    */
    function _rename_table($table_name, $new_table_name)
    {
        $sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
        return $sql;
    }
}

/* End of file postgre_forge.php */
/* Location: ./system/database/drivers/postgre/postgre_forge.php */