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

/**
 * SQLite3 Result Class
 *
 * This class extends the parent result class: CI_DB_result
 *
 * @category	Database
 * @author		Andrey Andreev
 * @link		https://codeigniter.com/user_guide/database/
 */
class CI_DB_sqlite3_result extends CI_DB_result {

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

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

    /**
     * Fetch Field Names
     *
     * Generates an array of column names
     *
     * @return	array
     */
    public function list_fields() {
        $field_names = array();
        for ($i = 0, $c = $this->num_fields(); $i < $c; $i++) {
            $field_names[] = $this->result_id->columnName($i);
        }

        return $field_names;
    }

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

    /**
     * Field data
     *
     * Generates an array of objects containing field meta-data
     *
     * @return	array
     */
    public function field_data() {
        static $data_types = array(
            SQLITE3_INTEGER => 'integer',
            SQLITE3_FLOAT => 'float',
            SQLITE3_TEXT => 'text',
            SQLITE3_BLOB => 'blob',
            SQLITE3_NULL => 'null'
        );

        $retval = array();
        for ($i = 0, $c = $this->num_fields(); $i < $c; $i++) {
            $retval[$i] = new stdClass();
            $retval[$i]->name = $this->result_id->columnName($i);

            $type = $this->result_id->columnType($i);
            $retval[$i]->type = isset($data_types[$type]) ? $data_types[$type] : $type;

            $retval[$i]->max_length = NULL;
        }

        return $retval;
    }

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

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

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

    /**
     * Result - associative array
     *
     * Returns the result set as an array
     *
     * @return	array
     */
    protected function _fetch_assoc() {
        return $this->result_id->fetchArray(SQLITE3_ASSOC);
    }

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

    /**
     * Result - object
     *
     * Returns the result set as an object
     *
     * @param	string	$class_name
     * @return	object
     */
    protected function _fetch_object($class_name = 'stdClass') {
        // No native support for fetching rows as objects
        if (($row = $this->result_id->fetchArray(SQLITE3_ASSOC)) === FALSE) {
            return FALSE;
        } elseif ($class_name === 'stdClass') {
            return (object) $row;
        }

        $class_name = new $class_name();
        foreach (array_keys($row) as $key) {
            $class_name->$key = $row[$key];
        }

        return $class_name;
    }

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

    /**
     * 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	$n	(ignored)
     * @return	array
     */
    public function data_seek($n = 0) {
        // Only resetting to the start of the result set is supported
        return ($n > 0) ? FALSE : $this->result_id->reset();
    }

}
