<?php
// This file is part of Moodle - http://moodle.org/
//
// 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/>.

/**
 * Page for editing random questions.
 *
 * @package    mod_quiz
 * @copyright  2018 Shamim Rezaie <shamim@moodle.com>

>  * @author     2021 Safat Shahin <safatshahin@catalyst-au.net>


 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once(__DIR__ . '/../../config.php');
require_once($CFG->dirroot . '/mod/quiz/locallib.php');

$slotid = required_param('slotid', PARAM_INT);
$returnurl = optional_param('returnurl', '', PARAM_LOCALURL);

// Get the quiz slot.

< $slot = $DB->get_record('quiz_slots', array('id' => $slotid));
< if (!$slot || empty($slot->questioncategoryid)) {
<     print_error('invalidrandomslot', 'mod_quiz');



> $slot = $DB->get_record('quiz_slots', ['id' => $slotid]);
> if (!$slot) {
>     new moodle_exception('invalidrandomslot', 'mod_quiz');


}


< if (!$quiz = $DB->get_record('quiz', array('id' => $slot->quizid))) {
<     print_error('invalidquizid', 'quiz');



> if (!$quiz = $DB->get_record('quiz', ['id' => $slot->quizid])) {
>     new moodle_exception('invalidquizid', 'quiz');


}

$cm = get_coursemodule_from_instance('quiz', $slot->quizid, $quiz->course);

require_login($cm->course, false, $cm);

if ($returnurl) {
    $returnurl = new moodle_url($returnurl);
} else {

<     $returnurl = new moodle_url('/mod/quiz/edit.php', array('cmid' => $cm->id));



>     $returnurl = new moodle_url('/mod/quiz/edit.php', ['cmid' => $cm->id]);


}


< $url = new moodle_url('/mod/quiz/editrandom.php', array('slotid' => $slotid));



> $url = new moodle_url('/mod/quiz/editrandom.php', ['slotid' => $slotid]);


$PAGE->set_url($url);
$PAGE->set_pagelayout('admin');

> $PAGE->add_body_class('limitedwidth');




< if (!$question = $DB->get_record('question', array('id' => $slot->questionid))) {
<     print_error('questiondoesnotexist', 'question', $returnurl);
< }
< 
< $qtypeobj = question_bank::get_qtype('random');



> $setreference = $DB->get_record('question_set_references',
>     ['itemid' => $slot->id, 'component' => 'mod_quiz', 'questionarea' => 'slot']);
> $filterconditions = json_decode($setreference->filtercondition);



// Validate the question category.

< if (!$category = $DB->get_record('question_categories', array('id' => $question->category))) {
<     print_error('categorydoesnotexist', 'question', $returnurl);



> if (!$category = $DB->get_record('question_categories', ['id' => $filterconditions->questioncategoryid])) {
>     new moodle_exception('categorydoesnotexist', 'question', $returnurl);


}

// Check permissions.

< question_require_capability_on($question, 'edit');



> $catcontext = context::instance_by_id($category->contextid);
> require_capability('moodle/question:useall', $catcontext);



$thiscontext = context_module::instance($cm->id);

< $contexts = new question_edit_contexts($thiscontext);



> $contexts = new core_question\local\bank\question_edit_contexts($thiscontext);




< // Create the question editing form.
< $mform = new mod_quiz\form\randomquestion_form(new moodle_url('/mod/quiz/editrandom.php'),
<         array('contexts' => $contexts));



> // Create the editing form.
> $mform = new mod_quiz\form\randomquestion_form(new moodle_url('/mod/quiz/editrandom.php'), ['contexts' => $contexts]);




< // Send the question object and a few more parameters to the form.
< $toform = fullclone($question);



> // Set the form data.
> $toform = new stdClass();


$toform->category = "{$category->id},{$category->contextid}";

< $toform->includesubcategories = $slot->includingsubcategories;



> $toform->includesubcategories = $filterconditions->includingsubcategories;


$toform->fromtags = array();

< $currentslottags = quiz_retrieve_slot_tags($slot->id);



> if (isset($filterconditions->tags)) {
>     $currentslottags = $filterconditions->tags;


foreach ($currentslottags as $slottag) {

<     $toform->fromtags[] = "{$slottag->tagid},{$slottag->tagname}";



>         $toform->fromtags[] = $slottag;
>     }


}

< $toform->returnurl = $returnurl;




> $toform->returnurl = $returnurl;
if ($cm !== null) {
> $toform->slotid = $slot->id;


    $toform->cmid = $cm->id;
    $toform->courseid = $cm->course;
} else {
    $toform->courseid = $COURSE->id;
}


< $toform->slotid = $slotid;
< 


$mform->set_data($toform);

if ($mform->is_cancelled()) {
    redirect($returnurl);
} else if ($fromform = $mform->get_data()) {

< 
<     // If we are moving a question, check we have permission to move it from
<     // whence it came. Where we are moving to is validated by the form.


    list($newcatid, $newcontextid) = explode(',', $fromform->category);

<     if (!empty($question->id) && $newcatid != $question->category) {



>     if ($newcatid != $category->id) {


        $contextid = $newcontextid;

<         question_require_capability_on($question, 'move');


    } else {
        $contextid = $category->contextid;
    }

>     $setreference->questionscontextid = $contextid;




<     $question = $qtypeobj->save_question($question, $fromform);
< 
<     // We need to save some data into the quiz_slots table.
<     $slot->questioncategoryid = $fromform->category;
<     $slot->includingsubcategories = $fromform->includesubcategories;
< 
<     $DB->update_record('quiz_slots', $slot);



>     // Set the filter conditions.
>     $filtercondition = new stdClass();
>     $filtercondition->questioncategoryid = $newcatid;
>     $filtercondition->includingsubcategories = $fromform->includesubcategories;




>     if (isset($fromform->fromtags)) {


    $tags = [];
    foreach ($fromform->fromtags as $tagstring) {
        list($tagid, $tagname) = explode(',', $tagstring);

<         $tags[] = (object) [
<             'id' => $tagid,
<             'name' => $tagname
<         ];
<     }
< 
<     $recordstokeep = [];
<     $recordstoinsert = [];
<     $searchableslottags = array_map(function($slottag) {
<         return ['tagid' => $slottag->tagid, 'tagname' => $slottag->tagname];
<     }, $currentslottags);
< 
<     foreach ($tags as $tag) {
<         if ($key = array_search(['tagid' => $tag->id, 'tagname' => $tag->name], $searchableslottags)) {
<             // If found, $key would be the id field in the quiz_slot_tags table.
<             // Therefore, there was no need to check !== false here.
<             $recordstokeep[] = $key;
<         } else {
<             $recordstoinsert[] = (object)[
<                 'slotid' => $slot->id,
<                 'tagid' => $tag->id,
<                 'tagname' => $tag->name
<             ];



>             $tags[] = "{$tagid},{$tagname}";


        }

>         if (!empty($tags)) {
    }
>             $filtercondition->tags = $tags;



< 
<     // Now, delete the remaining records.
<     if (!empty($recordstokeep)) {
<         list($select, $params) = $DB->get_in_or_equal($recordstokeep, SQL_PARAMS_QM, 'param', false);
<         array_unshift($params, $slot->id);
<         $DB->delete_records_select('quiz_slot_tags', "slotid = ? AND id $select", $params);
<     } else {
<         $DB->delete_records('quiz_slot_tags', array('slotid' => $slot->id));
<     }
< 
<     // And now, insert the extra records if there is any.
<     if (!empty($recordstoinsert)) {
<         $DB->insert_records('quiz_slot_tags', $recordstoinsert);


    }


<     // Purge this question from the cache.
<     question_bank::notify_question_edited($question->id);



>     $setreference->filtercondition = json_encode($filtercondition);
>     $DB->update_record('question_set_references', $setreference);




<     $returnurl->param('lastchanged', $question->id);


    redirect($returnurl);
}


< $streditingquestion = $qtypeobj->get_heading();
< $PAGE->set_title($streditingquestion);



> $PAGE->set_title('Random question');


$PAGE->set_heading($COURSE->fullname);

< $PAGE->navbar->add($streditingquestion);



> $PAGE->navbar->add('Random question');




< // Display a heading, question editing form and possibly some extra content needed for
< // for this question type.



> // Display a heading, question editing form.


echo $OUTPUT->header();
$heading = get_string('randomediting', 'mod_quiz');
echo $OUTPUT->heading_with_help($heading, 'randomquestion', 'mod_quiz');

$mform->display();

echo $OUTPUT->footer();