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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 3.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * PDO Oracle Database Adapter Class
 *
 * Note: _DB is an extender class that the app controller
 * creates dynamically based on whether the query builder
 * class is being used or not.
 *
 * @package             CodeIgniter
 * @subpackage  Drivers
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_pdo_oci_driver extends CI_DB_pdo_driver {

        /**
         * Sub-driver
         *
         * @var string
         */
        public $subdriver = 'oci';

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

        /**
         * List of reserved identifiers
         *
         * Identifiers that must NOT be escaped.
         *
         * @var string[]
         */
        protected $_reserved_identifiers = array('*', 'rownum');

        /**
         * ORDER BY random keyword
         *
         * @var array
         */
        protected $_random_keyword = array('ASC', 'ASC'); // Currently not supported

        /**
         * COUNT string
         *
         * @used-by     CI_DB_driver::count_all()
         * @used-by     CI_DB_query_builder::count_all_results()
         *
         * @var string
         */
        protected $_count_string = 'SELECT COUNT(1) AS ';

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

        /**
         * Class constructor
         *
         * Builds the DSN if not already set.
         *
         * @param       array   $params
         * @return      void
         */
        public function __construct($params)
        {
                parent::__construct($params);

                if (empty($this->dsn))
                {
                        $this->dsn = 'oci:dbname=';

                        // Oracle has a slightly different PDO DSN format (Easy Connect),
                        // which also supports pre-defined DSNs.
                        if (empty($this->hostname) && empty($this->port))
                        {
                                $this->dsn .= $this->database;
                        }
                        else
                        {
                                $this->dsn .= '//'.(empty($this->hostname) ? '127.0.0.1' : $this->hostname)
                                        .(empty($this->port) ? '' : ':'.$this->port).'/';

                                empty($this->database) OR $this->dsn .= $this->database;
                        }

                        empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
                }
                elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 4) === FALSE)
                {
                        $this->dsn .= ';charset='.$this->char_set;
                }
        }

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

        /**
         * Database version number
         *
         * @return      string
         */
        public function version()
        {
                if (isset($this->data_cache['version']))
                {
                        return $this->data_cache['version'];
                }

                $version_string = parent::version();
                if (preg_match('#Release\s(?<version>\d+(?:\.\d+)+)#', $version_string, $match))
                {
                        return $this->data_cache['version'] = $match[1];
                }

                return FALSE;
        }

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

        /**
         * Show table query
         *
         * Generates a platform-specific query string so that the table names can be fetched
         *
         * @param       bool    $prefix_limit
         * @return      string
         */
        protected function _list_tables($prefix_limit = FALSE)
        {
                $sql = 'SELECT "TABLE_NAME" FROM "ALL_TABLES"';

                if ($prefix_limit === TRUE && $this->dbprefix !== '')
                {
                        return $sql.' WHERE "TABLE_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' "
                                .sprintf($this->_like_escape_str, $this->_like_escape_chr);
                }

                return $sql;
        }

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

        /**
         * Show column query
         *
         * Generates a platform-specific query string so that the column names can be fetched
         *
         * @param       string  $table
         * @return      string
         */
        protected function _list_columns($table = '')
        {
                if (strpos($table, '.') !== FALSE)
                {
                        sscanf($table, '%[^.].%s', $owner, $table);
                }
                else
                {
                        $owner = $this->username;
                }

                return 'SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS
                        WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'
                                AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
        }

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

        /**
         * Returns an object with field data
         *
         * @param       string  $table
         * @return      array
         */
        public function field_data($table)
        {
                if (strpos($table, '.') !== FALSE)
                {
                        sscanf($table, '%[^.].%s', $owner, $table);
                }
                else
                {
                        $owner = $this->username;
                }

                $sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHAR_LENGTH, DATA_PRECISION, DATA_LENGTH, DATA_DEFAULT, NULLABLE
                        FROM ALL_TAB_COLUMNS
                        WHERE UPPER(OWNER) = '.$this->escape(strtoupper($owner)).'
                                AND UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));

                if (($query = $this->query($sql)) === FALSE)
                {
                        return FALSE;
                }
                $query = $query->result_object();

                $retval = array();
                for ($i = 0, $c = count($query); $i < $c; $i++)
                {
                        $retval[$i]                     = new stdClass();
                        $retval[$i]->name               = $query[$i]->COLUMN_NAME;
                        $retval[$i]->type               = $query[$i]->DATA_TYPE;

                        $length = ($query[$i]->CHAR_LENGTH > 0)
                                ? $query[$i]->CHAR_LENGTH : $query[$i]->DATA_PRECISION;
                        if ($length === NULL)
                        {
                                $length = $query[$i]->DATA_LENGTH;
                        }
                        $retval[$i]->max_length         = $length;

                        $default = $query[$i]->DATA_DEFAULT;
                        if ($default === NULL && $query[$i]->NULLABLE === 'N')
                        {
                                $default = '';
                        }
                        $retval[$i]->default            = $query[$i]->COLUMN_DEFAULT;
                }

                return $retval;
        }

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

        /**
         * Insert batch statement
         *
         * @param       string  $table  Table name
         * @param       array   $keys   INSERT keys
         * @param       array   $values INSERT values
         * @return      string
         */
        protected function _insert_batch($table, $keys, $values)
        {
                $keys = implode(', ', $keys);
                $sql = "INSERT ALL\n";

                for ($i = 0, $c = count($values); $i < $c; $i++)
                {
                        $sql .= '       INTO '.$table.' ('.$keys.') VALUES '.$values[$i]."\n";
                }

                return $sql.'SELECT * FROM dual';
        }

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

        /**
         * Delete statement
         *
         * Generates a platform-specific delete string from the supplied data
         *
         * @param       string  $table
         * @return      string
         */
        protected function _delete($table)
        {
                if ($this->qb_limit)
                {
                        $this->where('rownum <= ',$this->qb_limit, FALSE);
                        $this->qb_limit = FALSE;
                }

                return parent::_delete($table);
        }

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

        /**
         * LIMIT
         *
         * Generates a platform-specific LIMIT clause
         *
         * @param       string  $sql    SQL Query
         * @return      string
         */
        protected function _limit($sql)
        {
                if (version_compare($this->version(), '12.1', '>='))
                {
                        // OFFSET-FETCH can be used only with the ORDER BY clause
                        empty($this->qb_orderby) && $sql .= ' ORDER BY 1';

                        return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';
                }

                return 'SELECT * FROM (SELECT inner_query.*, rownum rnum FROM ('.$sql.') inner_query WHERE rownum < '.($this->qb_offset + $this->qb_limit + 1).')'
                        .($this->qb_offset ? ' WHERE rnum >= '.($this->qb_offset + 1): '');
        }

}