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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 - 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 1.3.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * MySQLi Result Class
 *
 * This class extends the parent result class: CI_DB_result
 *
 * @package             CodeIgniter
 * @subpackage  Drivers
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_mysqli_result extends CI_DB_result {

        /**
         * Number of rows in the result set
         *
         * @return      int
         */
        public function num_rows()
        {
                return is_int($this->num_rows)
                        ? $this->num_rows
                        : $this->num_rows = $this->result_id->num_rows;
        }

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

        /**
         * Number of fields in the result set
         *
         * @return      int
         */
        public function num_fields()
        {
                return $this->result_id->field_count;
        }

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

        /**
         * Fetch Field Names
         *
         * Generates an array of column names
         *
         * @return      array
         */
        public function list_fields()
        {
                $field_names = array();
                $this->result_id->field_seek(0);
                while ($field = $this->result_id->fetch_field())
                {
                        $field_names[] = $field->name;
                }

                return $field_names;
        }

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

        /**
         * Field data
         *
         * Generates an array of objects containing field meta-data
         *
         * @return      array
         */
        public function field_data()
        {
                $retval = array();
                $field_data = $this->result_id->fetch_fields();
                for ($i = 0, $c = count($field_data); $i < $c; $i++)
                {
                        $retval[$i]                     = new stdClass();
                        $retval[$i]->name               = $field_data[$i]->name;
                        $retval[$i]->type               = static::_get_field_type($field_data[$i]->type);
                        $retval[$i]->max_length         = $field_data[$i]->max_length;
                        $retval[$i]->primary_key        = (int) ($field_data[$i]->flags & MYSQLI_PRI_KEY_FLAG);
                        $retval[$i]->default            = $field_data[$i]->def;
                }

                return $retval;
        }

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

        /**
         * Get field type
         *
         * Extracts field type info from the bitflags returned by
         * mysqli_result::fetch_fields()
         *
         * @used-by     CI_DB_mysqli_result::field_data()
         * @param       int     $flags
         * @return      string
         */
        private static function _get_field_type($flags)
        {
                static $map;
                isset($map) OR $map = array(
                        MYSQLI_TYPE_DECIMAL     => 'decimal',
                        MYSQLI_TYPE_BIT         => 'bit',
                        MYSQLI_TYPE_TINY        => 'tinyint',
                        MYSQLI_TYPE_SHORT       => 'smallint',
                        MYSQLI_TYPE_INT24       => 'mediumint',
                        MYSQLI_TYPE_LONG        => 'int',
                        MYSQLI_TYPE_LONGLONG    => 'bigint',
                        MYSQLI_TYPE_FLOAT       => 'float',
                        MYSQLI_TYPE_DOUBLE      => 'double',
                        MYSQLI_TYPE_TIMESTAMP   => 'timestamp',
                        MYSQLI_TYPE_DATE        => 'date',
                        MYSQLI_TYPE_TIME        => 'time',
                        MYSQLI_TYPE_DATETIME    => 'datetime',
                        MYSQLI_TYPE_YEAR        => 'year',
                        MYSQLI_TYPE_NEWDATE     => 'date',
                        MYSQLI_TYPE_INTERVAL    => 'interval',
                        MYSQLI_TYPE_ENUM        => 'enum',
                        MYSQLI_TYPE_SET         => 'set',
                        MYSQLI_TYPE_TINY_BLOB   => 'tinyblob',
                        MYSQLI_TYPE_MEDIUM_BLOB => 'mediumblob',
                        MYSQLI_TYPE_BLOB        => 'blob',
                        MYSQLI_TYPE_LONG_BLOB   => 'longblob',
                        MYSQLI_TYPE_STRING      => 'char',
                        MYSQLI_TYPE_VAR_STRING  => 'varchar',
                        MYSQLI_TYPE_GEOMETRY    => 'geometry'
                );

                foreach ($map as $flag => $name)
                {
                        if ($flags & $flag)
                        {
                                return $name;
                        }
                }

                return $flags;
        }

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

        /**
         * Free the result
         *
         * @return      void
         */
        public function free_result()
        {
                if (is_object($this->result_id))
                {
                        $this->result_id->free();
                        $this->result_id = FALSE;
                }
        }

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

        /**
         * Data Seek
         *
         * Moves the internal pointer to the desired offset. We call
         * this internally before fetching results to make sure the
         * result set starts at zero.
         *
         * @param       int     $n
         * @return      bool
         */
        public function data_seek($n = 0)
        {
                return $this->result_id->data_seek($n);
        }

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

        /**
         * Result - associative array
         *
         * Returns the result set as an array
         *
         * @return      array
         */
        protected function _fetch_assoc()
        {
                return $this->result_id->fetch_assoc();
        }

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

        /**
         * Result - object
         *
         * Returns the result set as an object
         *
         * @param       string  $class_name
         * @return      object
         */
        protected function _fetch_object($class_name = 'stdClass')
        {
                return $this->result_id->fetch_object($class_name);
        }

}