<?php
// This file is part of the Query submission plugin
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace tool_brickfield\local\areas\core_question;

use core\event\question_created;
use core\event\question_updated;

/**

<  * Base class for various question-related areas



>  * Base class for various question-related areas.


 *

<  * This is an abstract class so it will be skipped by manager when it finds all areas



>  * This is an abstract class so it will be skipped by manager when it finds all areas.


 *
 * @package    tool_brickfield
 * @copyright  2020 onward: Brickfield Education Labs, www.brickfield.ie
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
abstract class answerbase extends base {

    /**
     * Get table name reference.

>      *


     * @return string
     */
    public function get_ref_tablename(): string {
        return 'question';
    }

    /**
     * Find recordset of the relevant areas.

>      *


     * @param \core\event\base $event
     * @return \moodle_recordset|null

<      * @throws \coding_exception
<      * @throws \dml_exception


     */
    public function find_relevant_areas(\core\event\base $event): ?\moodle_recordset {
        global $DB;

< 


        if (($event instanceof question_created) || ($event instanceof question_updated)) {

<             $rs = $DB->get_recordset_sql(
<                 "SELECT {$this->get_type()} AS type,



>             $sql = "SELECT {$this->get_type()} AS type,


                ctx.id AS contextid,
                {$this->get_standard_area_fields_sql()}
                a.id AS itemid,
                {$this->get_reftable_field_sql()}

<                 t.id AS refid,



>                            q.id AS refid,


                {$this->get_course_and_cat_sql($event)}
                a.{$this->get_fieldname()} AS content

<             FROM {question} t
<             INNER JOIN {question_answers} a ON a.question = t.id
<             INNER JOIN {question_categories} qc ON qc.id = t.category
<             INNER JOIN {context} ctx ON ctx.id = qc.contextid
<             WHERE (t.id = :refid)
<             ORDER BY a.id",
<                 [
<                     'refid' => $event->objectid,
<                 ]);



>                       FROM {question} q
>                 INNER JOIN {question_answers} a
>                         ON a.question = q.id
>                 INNER JOIN {question_versions} qv
>                         ON qv.questionid = q.id
>                 INNER JOIN {question_bank_entries} qbe
>                         ON qbe.id = qv.questionbankentryid
>                 INNER JOIN {question_categories} qc
>                         ON qc.id = qbe.questioncategoryid
>                 INNER JOIN {context} ctx
>                         ON ctx.id = qc.contextid
>                      WHERE (q.id = :refid)
>                   ORDER BY a.id";
> 
>             $rs = $DB->get_recordset_sql($sql, ['refid' => $event->objectid]);


            return $rs;

> 


        }
        return null;
    }

    /**
     * Return an array of area objects that contain content at the site and system levels only. This would be question content from
     * question categories at the system context, or course category context.

>      *


     * @return mixed

<      * @throws \dml_exception


     */
    public function find_system_areas(): ?\moodle_recordset {
        global $DB;

<         $select = 'SELECT ' . $this->get_type() . ' AS type, qc.contextid AS contextid, ' . $this->get_standard_area_fields_sql() .
<             ' a.id AS itemid, ' . $this->get_reftable_field_sql() . 't.id AS refid, '.
<             SITEID . ' as courseid, cc.id as categoryid, a.'.$this->get_fieldname().' AS content ';
<         $from = 'FROM {question} t ' .
<             'INNER JOIN {question_answers} a ON a.question = t.id ' .
<             'INNER JOIN {question_categories} qc ON qc.id = t.category ' .
<             'INNER JOIN {context} ctx ON ctx.id = qc.contextid ' .
<             'LEFT JOIN {course_categories} cc ON cc.id = ctx.instanceid AND ctx.contextlevel = :coursecat ';
<         $where = 'WHERE (ctx.contextlevel = :syscontext) OR (ctx.contextlevel = :coursecat2) ';
<         $order = 'ORDER BY a.id';


        $params = [
            'syscontext' => CONTEXT_SYSTEM,
            'coursecat' => CONTEXT_COURSECAT,
            'coursecat2' => CONTEXT_COURSECAT,
        ];


<         return $DB->get_recordset_sql($select . $from . $where . $order, $params);



>         $sql = "SELECT {$this->get_type()} AS type,
>                        qc.contextid AS contextid,
>                        {$this->get_standard_area_fields_sql()}
>                        a.id AS itemid,
>                        {$this->get_reftable_field_sql()}
>                        q.id AS refid,
>                        " . SITEID . "  as courseid,
>                        cc.id as categoryid,
>                        a.{$this->get_fieldname()} AS content
>                   FROM {question} q
>             INNER JOIN {question_answers} a
>                     ON a.question = q.id
>             INNER JOIN {question_versions} qv
>                     ON qv.questionid = q.id
>             INNER JOIN {question_bank_entries} qbe
>                     ON qbe.id = qv.questionbankentryid
>             INNER JOIN {question_categories} qc
>                     ON qc.id = qbe.questioncategoryid
>             INNER JOIN {context} ctx
>                     ON ctx.id = qc.contextid
>              LEFT JOIN {course_categories} cc
>                     ON cc.id = ctx.instanceid
>                    AND ctx.contextlevel = :coursecat
>                  WHERE (ctx.contextlevel = :syscontext)
>                     OR (ctx.contextlevel = :coursecat2)
>               ORDER BY a.id";
> 
>         return $DB->get_recordset_sql($sql, $params);


    }

    /**
     * Find recordset of the course areas.

>      *


     * @param int $courseid
     * @return \moodle_recordset

<      * @throws \coding_exception
<      * @throws \dml_exception


     */
    public function find_course_areas(int $courseid): ?\moodle_recordset {
        global $DB;

        $coursecontext = \context_course::instance($courseid);

<         return $DB->get_recordset_sql(
<             "SELECT {$this->get_type()} AS type,



>         $param = [
>             'ctxcourse' => CONTEXT_COURSE,
>             'courseid' => $courseid,
>             'module' => CONTEXT_MODULE,
>             'coursecontextpath' => $DB->sql_like_escape($coursecontext->path) . '/%',
>         ];
> 
>         $sql = "SELECT {$this->get_type()} AS type,


                ctx.id AS contextid,
                {$this->get_standard_area_fields_sql()}
                a.id AS itemid,
                {$this->get_reftable_field_sql()}

<                 t.id AS refid,



>                        q.id AS refid,


                {$courseid} AS courseid,
                a.{$this->get_fieldname()} AS content

<             FROM {question} t
<             INNER JOIN {question_answers} a ON a.question = t.id
<             INNER JOIN {question_categories} qc ON qc.id = t.category
<             INNER JOIN {context} ctx ON ctx.id = qc.contextid
<             WHERE (ctx.contextlevel = :ctxcourse AND ctx.id = qc.contextid AND ctx.instanceid = :courseid) OR
<                 (ctx.contextlevel = :module AND {$DB->sql_like('ctx.path', ':coursecontextpath')})
<             ORDER BY a.id",
<             ['ctxcourse' => CONTEXT_COURSE,
<              'courseid' => $courseid,
<              'module' => CONTEXT_MODULE,
<              'coursecontextpath' => $DB->sql_like_escape($coursecontext->path) . '/%',
<             ]);



>                   FROM {question} q
>             INNER JOIN {question_answers} a
>                     ON a.question = q.id
>             INNER JOIN {question_versions} qv
>                     ON qv.questionid = q.id
>             INNER JOIN {question_bank_entries} qbe
>                     ON qbe.id = qv.questionbankentryid
>             INNER JOIN {question_categories} qc
>                     ON qc.id = qbe.questioncategoryid
>             INNER JOIN {context} ctx
>                     ON ctx.id = qc.contextid
>                  WHERE (ctx.contextlevel = :ctxcourse
>                    AND ctx.id = qc.contextid
>                    AND ctx.instanceid = :courseid)
>                     OR (ctx.contextlevel = :module
>                    AND {$DB->sql_like('ctx.path', ':coursecontextpath')})
>               ORDER BY a.id ASC";
> 
>         return $DB->get_recordset_sql($sql, $param);


    }
}