Add category filter to set question selection

administrator/components/com_testquestions/forms/set.xml

@@ -8,6 +8,5 @@
             <option value="1">JPUBLISHED</option>
             <option value="0">JUNPUBLISHED</option>
         </field>
-        <field name="question_ids" type="sql" label="COM_TESTQUESTIONS_SET_QUESTIONS" multiple="true" layout="joomla.form.field.list-fancy-select" query="SELECT id, question FROM #__testquestions_questions ORDER BY ordering ASC, id ASC" key_field="id" value_field="question" translate_query="false" />
     </fieldset>
 </form>

administrator/components/com_testquestions/language/en-GB/com_testquestions.ini

@@ -53,3 +53,6 @@ COM_TESTQUESTIONS_SET_DESCRIPTION="Opis zestawu"
 COM_TESTQUESTIONS_SET_QUESTIONS="Pytania w zestawie"
 COM_TESTQUESTIONS_SET_QUESTION_COUNT="Liczba pytań"
 COM_TESTQUESTIONS_SET_SEARCH="Szukaj zestawów..."
+COM_TESTQUESTIONS_SET_CATEGORY_FILTER="Filtruj pytania według kategorii"
+COM_TESTQUESTIONS_SET_ALL_CATEGORIES="Wszystkie kategorie"
+COM_TESTQUESTIONS_UNCATEGORIZED="Bez kategorii"

administrator/components/com_testquestions/sql/updates/mysql/1.9.1.sql

@@ -0,0 +1 @@
+-- No database changes required for version 1.9.1.

administrator/components/com_testquestions/src/Model/SetModel.php

@@ -44,6 +44,31 @@ class SetModel extends AdminModel
         return Factory::getApplication()->getUserState('com_testquestions.edit.set.data', []) ?: $this->getItem();
     }
 
+    public function getQuestions()
+    {
+        $db = Factory::getContainer()->get('DatabaseDriver');
+
+        return $db->setQuery(
+            $db->getQuery(true)
+                ->select(['q.id', 'q.question', 'q.category_id', 'c.title AS category_title'])
+                ->from($db->quoteName('#__testquestions_questions', 'q'))
+                ->leftJoin($db->quoteName('#__testquestions_categories', 'c') . ' ON c.id = q.category_id')
+                ->order('c.title ASC, q.ordering ASC, q.id ASC')
+        )->loadObjectList();
+    }
+
+    public function getCategories()
+    {
+        $db = Factory::getContainer()->get('DatabaseDriver');
+
+        return $db->setQuery(
+            $db->getQuery(true)
+                ->select(['id', 'title'])
+                ->from($db->quoteName('#__testquestions_categories'))
+                ->order($db->quoteName('title') . ' ASC')
+        )->loadObjectList();
+    }
+
     public function save($data)
     {
         $questionIds = array_values(array_unique(array_filter(array_map('intval', (array) ($data['question_ids'] ?? [])))));

administrator/components/com_testquestions/src/View/Set/HtmlView.php

@@ -12,11 +12,15 @@ class HtmlView extends BaseHtmlView
 {
     protected $form;
     protected $item;
+    protected $questions;
+    protected $categories;
 
     public function display($tpl = null)
     {
         $this->form = $this->get('Form');
         $this->item = $this->get('Item');
+        $this->questions = $this->get('Questions');
+        $this->categories = $this->get('Categories');
 
         if (count($errors = $this->get('Errors'))) {
             throw new \RuntimeException(implode("\n", $errors));

administrator/components/com_testquestions/tmpl/set/edit.php

@@ -12,8 +12,46 @@ HTMLHelper::_('behavior.formvalidator');
         <?php echo $this->form->renderField('title'); ?>
         <?php echo $this->form->renderField('description'); ?>
         <?php echo $this->form->renderField('published'); ?>
-        <?php echo $this->form->renderField('question_ids'); ?>
+        <div class="mb-3">
+            <label for="set-question-category" class="form-label"><?php echo \Joomla\CMS\Language\Text::_('COM_TESTQUESTIONS_SET_CATEGORY_FILTER'); ?></label>
+            <select id="set-question-category" class="form-select">
+                <option value=""><?php echo \Joomla\CMS\Language\Text::_('COM_TESTQUESTIONS_SET_ALL_CATEGORIES'); ?></option>
+                <?php foreach ($this->categories as $category) : ?>
+                    <option value="<?php echo (int) $category->id; ?>"><?php echo $this->escape($category->title); ?></option>
+                <?php endforeach; ?>
+            </select>
+        </div>
+        <fieldset class="mb-3">
+            <legend><?php echo \Joomla\CMS\Language\Text::_('COM_TESTQUESTIONS_SET_QUESTIONS'); ?></legend>
+            <div id="set-question-list" class="border rounded p-3">
+                <?php foreach ($this->questions as $question) : ?>
+                    <div class="form-check set-question-row" data-category="<?php echo (int) $question->category_id; ?>">
+                        <input class="form-check-input" type="checkbox" name="jform[question_ids][]" value="<?php echo (int) $question->id; ?>" id="set-question-<?php echo (int) $question->id; ?>" <?php echo in_array((int) $question->id, (array) $this->item->question_ids, true) ? 'checked' : ''; ?>>
+                        <label class="form-check-label" for="set-question-<?php echo (int) $question->id; ?>">
+                            <span class="badge bg-secondary"><?php echo $this->escape($question->category_title ?: \Joomla\CMS\Language\Text::_('COM_TESTQUESTIONS_UNCATEGORIZED')); ?></span>
+                            <?php echo $this->escape(trim(strip_tags($question->question))); ?>
+                        </label>
+                    </div>
+                <?php endforeach; ?>
+            </div>
+        </fieldset>
     </fieldset>
     <input type="hidden" name="task" value="">
     <?php echo HTMLHelper::_('form.token'); ?>
 </form>
+<script>
+document.addEventListener('DOMContentLoaded', function () {
+    const filter = document.getElementById('set-question-category');
+    const rows = document.querySelectorAll('.set-question-row');
+
+    if (!filter) {
+        return;
+    }
+
+    filter.addEventListener('change', function () {
+        rows.forEach(function (row) {
+            row.classList.toggle('d-none', filter.value !== '' && row.dataset.category !== filter.value);
+        });
+    });
+});
+</script>