<?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/>.

/**
 * Defines the custom question bank view used on the Edit quiz page.
 *
 * @package   mod_quiz
 * @category  question
 * @copyright 1999 onwards Martin Dougiamas and others {@link http://moodle.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_quiz\question\bank;


> defined('MOODLE_INTERNAL') || die();
use core_question\local\bank\question_version_status;
> 
use mod_quiz\question\bank\filter\custom_category_condition;
> use core\output\datafilter;

> use core_question\local\bank\column_base;
/**
> use core_question\local\bank\condition;
 * Subclass to customise the view of the question bank for the quiz editing screen.
> use core_question\local\bank\column_manager_base;


 *

> use qbank_managecategories\category_condition;


 * @copyright  2009 Tim Hunt

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


 * @author     2021 Safat Shahin <safatshahin@catalyst-au.net>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class custom_view extends \core_question\local\bank\view {

>     /** @var int number of questions per page to show in the add from question bank modal. */

>     const DEFAULT_PAGE_SIZE = 20;


    /** @var bool $quizhasattempts whether the quiz this is used by has been attemptd. */
    protected $quizhasattempts = false;

    /** @var \stdClass $quiz the quiz settings. */
    protected $quiz = false;


<     /** @var int The maximum displayed length of the category info. */
<     const MAX_TEXT_LENGTH = 200;



>     /**
>      * @var string $component the component the api is used from.
>      */
>     public $component = 'mod_quiz';



    /**
     * Constructor.
     * @param \core_question\local\bank\question_edit_contexts $contexts
     * @param \moodle_url $pageurl
     * @param \stdClass $course course settings
     * @param \stdClass $cm activity settings.
     * @param \stdClass $quiz quiz settings.
     */

<     public function __construct($contexts, $pageurl, $course, $cm, $quiz) {
<         parent::__construct($contexts, $pageurl, $course, $cm);
<         $this->quiz = $quiz;
<     }
< 
<     protected function get_question_bank_plugins(): array {
<         $questionbankclasscolumns = [];
<         $corequestionbankcolumns = [
<             'add_action_column',
<             'checkbox_column',
<             'question_type_column',
<             'question_name_text_column',
<             'preview_action_column'



>     public function __construct($contexts, $pageurl, $course, $cm, $params, $extraparams) {
>         // Default filter condition.
>         if (!isset($params['filter'])) {
>             $params['filter']  = [];
>             [$categoryid, $contextid] = custom_category_condition::validate_category_param($params['cat']);
>             if (!is_null($categoryid)) {
>                 $category = custom_category_condition::get_category_record($categoryid, $contextid);
>                 $params['filter']['category'] = [
>                     'jointype' => custom_category_condition::JOINTYPE_DEFAULT,
>                     'values' => [$category->id],
>                     'filteroptions' => ['includesubcategories' => false],


        ];

< 
<         if (question_get_display_preference('qbshowtext', 0, PARAM_INT, new \moodle_url(''))) {
<             $corequestionbankcolumns[] = 'question_text_row';
<         }
< 
<         foreach ($corequestionbankcolumns as $fullname) {
<             $shortname = $fullname;
<             if (class_exists('mod_quiz\\question\\bank\\' . $fullname)) {
<                 $fullname = 'mod_quiz\\question\\bank\\' . $fullname;
<                 $questionbankclasscolumns[$shortname] = new $fullname($this);
<             } else if (class_exists('core_question\\local\\bank\\' . $fullname)) {
<                 $fullname = 'core_question\\local\\bank\\' . $fullname;
<                 $questionbankclasscolumns[$shortname] = new $fullname($this);
<             } else {
<                 $questionbankclasscolumns[$shortname] = '';
<             }
<         }
<         $plugins = \core_component::get_plugin_list_with_class('qbank', 'plugin_feature', 'plugin_feature.php');
<         foreach ($plugins as $componentname => $plugin) {
<             $pluginentrypointobject = new $plugin();
<             $plugincolumnobjects = $pluginentrypointobject->get_question_columns($this);
<             // Don't need the plugins without column objects.
<             if (empty($plugincolumnobjects)) {
<                 unset($plugins[$componentname]);
<                 continue;
<             }
<             foreach ($plugincolumnobjects as $columnobject) {
<                 $columnname = $columnobject->get_column_name();
<                 foreach ($corequestionbankcolumns as $key => $corequestionbankcolumn) {
<                     if (!\core\plugininfo\qbank::is_plugin_enabled($componentname)) {
<                         unset($questionbankclasscolumns[$columnname]);
<                         continue;


                    }

<                     // Check if it has custom preference selector to view/hide.
<                     if ($columnobject->has_preference() && !$columnobject->get_preference()) {
<                         continue;
<                     }
<                     if ($corequestionbankcolumn === $columnname) {
<                         $questionbankclasscolumns[$columnname] = $columnobject;


                    }

> 
                }
>         $this->init_columns($this->wanted_columns(), $this->heading_column());
            }
>         parent::__construct($contexts, $pageurl, $course, $cm, $params, $extraparams);
        }
>         [$this->quiz, ] = get_module_from_cmid($cm->id);

>         $this->set_quiz_has_attempts(quiz_has_attempts($this->quiz->id));
        // Mitigate the error in case of any regression.
>         $this->pagesize = self::DEFAULT_PAGE_SIZE;


        foreach ($questionbankclasscolumns as $shortname => $questionbankclasscolumn) {

> 
            if (empty($questionbankclasscolumn)) {
>     /**
                unset($questionbankclasscolumns[$shortname]);
>      * Just use the base column manager in this view.
            }
>      *
        }
>      * @return void

>      */
        return $questionbankclasscolumns;
>     protected function init_column_manager(): void {
    }
>         $this->columnmanager = new column_manager_base();




> 
    protected function heading_column(): string {
>     /**
        return 'mod_quiz\\question\\bank\\question_name_text_column';
>      * Don't display plugin controls.
    }
>      *

>      * @param \core\context $context
    protected function default_sort(): array {
>      * @param int $categoryid
        // Using the extended class for quiz specific sort.
>      * @return string
        return [
>      */
            'qbank_viewquestiontype\\question_type_column' => 1,
>     protected function get_plugin_controls(\core\context $context, int $categoryid): string {
            'mod_quiz\\question\\bank\\question_name_text_column' => 1,
>         return '';



<         // Mitigate the error in case of any regression.
<         foreach ($questionbankclasscolumns as $shortname => $questionbankclasscolumn) {
<             if (empty($questionbankclasscolumn)) {
<                 unset($questionbankclasscolumns[$shortname]);



>     protected function get_question_bank_plugins(): array {
>         $questionbankclasscolumns = [];
>         $customviewcolumns = [
>             'mod_quiz\question\bank\add_action_column' . column_base::ID_SEPARATOR  . 'add_action_column',
>             'core_question\local\bank\checkbox_column' . column_base::ID_SEPARATOR . 'checkbox_column',
>             'qbank_viewquestiontype\question_type_column' . column_base::ID_SEPARATOR . 'question_type_column',
>             'mod_quiz\question\bank\question_name_text_column' . column_base::ID_SEPARATOR . 'question_name_text_column',
>             'mod_quiz\question\bank\preview_action_column'  . column_base::ID_SEPARATOR  . 'preview_action_column',
>         ];
> 
>         foreach ($customviewcolumns as $columnid) {
>             [$columnclass, $columnname] = explode(column_base::ID_SEPARATOR, $columnid, 2);
>             if (class_exists($columnclass)) {
>                 $questionbankclasscolumns[$columnid] = $columnclass::from_column_name($this, $columnname);



<             'qbank_viewquestiontype\\question_type_column' => 1,
<             'mod_quiz\\question\\bank\\question_name_text_column' => 1,



>             'qbank_viewquestiontype__question_type_column' => SORT_ASC,
>             'mod_quiz__question__bank__question_name_text_column' => SORT_ASC,


     * should be displayed.
     *
     * @param bool $quizhasattempts whether the quiz has attempts.
     */

<     public function set_quiz_has_attempts($quizhasattempts): void {



>     private function set_quiz_has_attempts($quizhasattempts): void {


        $this->quizhasattempts = $quizhasattempts;
        if ($quizhasattempts && isset($this->visiblecolumns['addtoquizaction'])) {
            unset($this->visiblecolumns['addtoquizaction']);
        }
    }

    /**

<      * Question preview url.
<      *
<      * @param \stdClass $question
<      * @return \moodle_url
<      */
<     public function preview_question_url($question) {
<         return quiz_question_preview_url($this->quiz, $question);
<     }
< 
<     /**


     * URL of add to quiz.
     *
     * @param $questionid
     * @return \moodle_url
     */
    public function add_to_quiz_url($questionid) {
        $params = $this->baseurl->params();
        $params['addquestion'] = $questionid;
        $params['sesskey'] = sesskey();

>         $params['cmid'] = $this->cm->id;


        return new \moodle_url('/mod/quiz/edit.php', $params);
    }

    /**
     * Renders the html question bank (same as display, but returns the result).
     *
     * Note that you can only output this rendered result once per page, as
     * it contains IDs which must be unique.
     *
     * @param array $pagevars
     * @param string $tabname
     * @return string HTML code for the form
     */
    public function render($pagevars, $tabname): string {
        ob_start();

<         $this->display($pagevars, $tabname);



>         $this->display();


        $out = ob_get_contents();
        ob_end_clean();
        return $out;
    }

    protected function display_bottom_controls(\context $catcontext): void {
        $cmoptions = new \stdClass();
        $cmoptions->hasattempts = !empty($this->quizhasattempts);

        $canuseall = has_capability('moodle/question:useall', $catcontext);

        echo \html_writer::start_tag('div', ['class' => 'pt-2']);
        if ($canuseall) {
            // Add selected questions to the quiz.

<             $params = array(



>             $params = [


                'type' => 'submit',
                'name' => 'add',
                'class' => 'btn btn-primary',
                'value' => get_string('addselectedquestionstoquiz', 'quiz'),
                'data-action' => 'toggle',
                'data-togglegroup' => 'qbank',
                'data-toggle' => 'action',
                'disabled' => true,

<             );



>             ];


            echo \html_writer::empty_tag('input', $params);
        }
        echo \html_writer::end_tag('div');
    }


>     /**
    protected function create_new_question_form($category, $canadd): void {
>      * Override the base implementation in \core_question\local\bank\view
        // Don't display this.
>      * because we don't want to print new question form in the fragment
    }
>      * for the modal.

>      *
    /**
>      * @param false|mixed|\stdClass $category
     * Override the base implementation in \core_question\local\bank\view
>      * @param bool $canadd
     * because we don't want to print the headers in the fragment
>      */



<         // Don't display this.


     */
    protected function display_question_bank_header(): void {
    }


<     /**
<      * Override the base implementation in \core_question\bank\view
<      * because we don't want it to read from the $_POST global variables
<      * for the sort parameters since they are not present in a fragment.
<      *
<      * Unfortunately the best we can do is to look at the URL for
<      * those parameters (only marginally better really).
<      */
<     protected function init_sort_from_params(): void {
<         $this->sort = [];
<         for ($i = 1; $i <= self::MAX_SORTS; $i++) {
<             if (!$sort = $this->baseurl->param('qbs' . $i)) {
<                 break;
<             }
<             // Work out the appropriate order.
<             $order = 1;
<             if ($sort[0] == '-') {
<                 $order = -1;
<                 $sort = substr($sort, 1);
<                 if (!$sort) {
<                     break;
<                 }
<             }
<             // Deal with subsorts.
<             list($colname) = $this->parse_subsort($sort);
<             $this->get_column_type($colname);
<             $this->sort[$sort] = $order;
<         }
<     }
< 


    protected function build_query(): void {
        // Get the required tables and fields.

<         $joins = [];
<         $fields = ['qv.status', 'qc.id as categoryid', 'qv.version', 'qv.id as versionid', 'qbe.id as questionbankentryid'];
<         if (!empty($this->requiredcolumns)) {
<             foreach ($this->requiredcolumns as $column) {
<                 $extrajoins = $column->get_extra_joins();
<                 foreach ($extrajoins as $prefix => $join) {
<                     if (isset($joins[$prefix]) && $joins[$prefix] != $join) {
<                         throw new \coding_exception('Join ' . $join . ' conflicts with previous join ' . $joins[$prefix]);
<                     }
<                     $joins[$prefix] = $join;
<                 }
<                 $fields = array_merge($fields, $column->get_required_fields());
<             }
<         }
<         $fields = array_unique($fields);



>         [$fields, $joins] = $this->get_component_requirements(array_merge($this->requiredcolumns, $this->questionactions));



        // Build the order by clause.
        $sorts = [];

<         foreach ($this->sort as $sort => $order) {
<             list($colname, $subsort) = $this->parse_subsort($sort);
<             $sorts[] = $this->requiredcolumns[$colname]->sort_expression($order < 0, $subsort);



>         foreach ($this->sort as $sortname => $sortorder) {
>             [$colname, $subsort] = $this->parse_subsort($sortname);
>             $sorts[] = $this->requiredcolumns[$colname]->sort_expression($sortorder == SORT_DESC, $subsort);


        }

        // Build the where clause.
        $latestversion = 'qv.version = (SELECT MAX(v.version)
                                          FROM {question_versions} v
                                          JOIN {question_bank_entries} be
                                            ON be.id = v.questionbankentryid
                                         WHERE be.id = qbe.id)';

<         $readyonly = "qv.status = '" . question_version_status::QUESTION_STATUS_READY . "' ";
<         $tests = ['q.parent = 0', $latestversion, $readyonly];



>         $onlyready = '((' . "qv.status = '" . question_version_status::QUESTION_STATUS_READY . "'" .'))';


        $this->sqlparams = [];

>         $conditions = [];


        foreach ($this->searchconditions as $searchcondition) {
            if ($searchcondition->where()) {

<                 $tests[] = '((' . $searchcondition->where() .'))';



>                 $conditions[] = '((' . $searchcondition->where() .'))';


            }
            if ($searchcondition->params()) {
                $this->sqlparams = array_merge($this->sqlparams, $searchcondition->params());
            }
        }

>         $majorconditions = ['q.parent = 0', $latestversion, $onlyready];
        // Build the SQL.
>         // Get higher level filter condition.
        $sql = ' FROM {question} q ' . implode(' ', $joins);
>         $jointype = isset($this->pagevars['jointype']) ? (int)$this->pagevars['jointype'] : condition::JOINTYPE_DEFAULT;
        $sql .= ' WHERE ' . implode(' AND ', $tests);
>         $nonecondition = ($jointype === datafilter::JOINTYPE_NONE) ? ' NOT ' : '';
        $this->countsql = 'SELECT count(1)' . $sql;
>         $separator = ($jointype === datafilter::JOINTYPE_ALL) ? ' AND ' : ' OR ';



<         $sql .= ' WHERE ' . implode(' AND ', $tests);



>         $sql .= ' WHERE ' . implode(' AND ', $majorconditions);
>         if (!empty($conditions)) {
>             $sql .= ' AND ' . $nonecondition . ' ( ';
>             $sql .= implode($separator, $conditions);
>             $sql .= ' ) ';
>         }


    }


<     public function wanted_filters($cat, $tagids, $showhidden, $recurse, $editcontexts, $showquestiontext): void {
<         global $CFG;
<         list(, $contextid) = explode(',', $cat);
<         $catcontext = \context::instance_by_id($contextid);
<         $thiscontext = $this->get_most_specific_context();
<         // Category selection form.
<         $this->display_question_bank_header();
< 
<         // Display tag filter if usetags setting is enabled/enablefilters is true.
<         if ($this->enablefilters) {
<             if (is_array($this->customfilterobjects)) {
<                 foreach ($this->customfilterobjects as $filterobjects) {
<                     $this->searchconditions[] = $filterobjects;
<                 }
<             } else {
<                 if ($CFG->usetags) {
<                     array_unshift($this->searchconditions,
<                         new \core_question\bank\search\tag_condition([$catcontext, $thiscontext], $tagids));
<                 }
< 
<                 array_unshift($this->searchconditions, new \core_question\bank\search\hidden_condition(!$showhidden));
<                 array_unshift($this->searchconditions, new custom_category_condition(
<                     $cat, $recurse, $editcontexts, $this->baseurl, $this->course));



>     public function add_standard_search_conditions(): void {
>         foreach ($this->plugins as $componentname => $plugin) {
>             if (\core\plugininfo\qbank::is_plugin_enabled($componentname)) {
>                 $pluginentrypointobject = new $plugin();
>                 if ($componentname === 'qbank_managecategories') {
>                     $pluginentrypointobject = new quiz_managecategories_feature();
>                 }
>                 if ($componentname === 'qbank_viewquestiontext' || $componentname === 'qbank_deletequestion') {
>                     continue;
>                 }
>                 $pluginobjects = $pluginentrypointobject->get_question_filters($this);
>                 foreach ($pluginobjects as $pluginobject) {
>                     $this->add_searchcondition($pluginobject, $pluginobject->get_condition_key());
>                 }
>             }


            }
        }

<         $this->display_options_form($showquestiontext);



> 
>     /**
>      * Return the quiz settings for the quiz this question bank is displayed in.
>      *
>      * @return bool|\stdClass
>      */
>     public function get_quiz() {
>         return $this->quiz;


    }
}