Method getTemplate

/**
 * Gets the name of the current template.
 *
 * @param   boolean  $params  True to return the template parameters
 *
 * @return  string  The name of the template.
 *
 * @since   3.2
 * @throws  \InvalidArgumentException
 */
public function getTemplate($params = false)
{
    if (\is_object($this->template)) {
        if ($this->template->parent) {
            if (!is_file(JPATH_THEMES . '/' . $this->template->template . '/index.php')) {
                if (!is_file(JPATH_THEMES . '/' . $this->template->parent . '/index.php')) {
                    throw new \InvalidArgumentException(Text::sprintf('JERROR_COULD_NOT_FIND_TEMPLATE', $this->template->template));
                }
            }
        } elseif (!is_file(JPATH_THEMES . '/' . $this->template->template . '/index.php')) {
            throw new \InvalidArgumentException(Text::sprintf('JERROR_COULD_NOT_FIND_TEMPLATE', $this->template->template));
        }
        if ($params) {
            return $this->template;
        }
        return $this->template->template;
    }
    // Get the id of the active menu item
    $menu = $this->getMenu();
    $item = $menu->getActive();
    if (!$item) {
        $item = $menu->getItem($this->input->getInt('Itemid', null));
    }
    $id = 0;
    if (\is_object($item)) {
        // Valid item retrieved
        $id = $item->template_style_id;
    }
    $tid = $this->input->getUint('templateStyle', 0);
    if (is_numeric($tid) && (int) $tid > 0) {
        $id = (int) $tid;
    }
    /** @var OutputController $cache */
    $cache = Factory::getContainer()->get(CacheControllerFactoryInterface::class)->createCacheController('output', ['defaultgroup' => 'com_templates']);
    if ($this->getLanguageFilter()) {
        $tag = $this->getLanguage()->getTag();
    } else {
        $tag = '';
    }
    $cacheId = 'templates0' . $tag;
    if ($cache->contains($cacheId)) {
        $templates = $cache->get($cacheId);
    } else {
        // Load styles
        $db = Factory::getDbo();
        $query = $db->getQuery(true)->select($db->quoteName(['id', 'home', 'template', 's.params', 'inheritable', 'parent']))->from($db->quoteName('#__template_styles', 's'))->where([$db->quoteName('s.client_id') . ' = 0', $db->quoteName('e.enabled') . ' = 1'])->join('LEFT', $db->quoteName('#__extensions', 'e'), $db->quoteName('e.element') . ' = ' . $db->quoteName('s.template') . ' AND ' . $db->quoteName('e.type') . ' = ' . $db->quote('template') . ' AND ' . $db->quoteName('e.client_id') . ' = ' . $db->quoteName('s.client_id'));
        $db->setQuery($query);
        $templates = $db->loadObjectList('id');
        foreach ($templates as &$template) {
            // Create home element
            if ($template->home == 1 && !isset($template_home) || $this->getLanguageFilter() && $template->home == $tag) {
                $template_home = clone $template;
            }
            $template->params = new Registry($template->params);
        }
        // Unset the $template reference to the last $templates[n] item cycled in the foreach above to avoid editing it later
        unset($template);
        // Add home element, after loop to avoid double execution
        if (isset($template_home)) {
            $template_home->params = new Registry($template_home->params);
            $templates[0] = $template_home;
        }
        $cache->store($templates, $cacheId);
    }
    if (isset($templates[$id])) {
        $template = $templates[$id];
    } else {
        $template = $templates[0];
    }
    // Allows for overriding the active template from the request
    $template_override = $this->input->getCmd('template', '');
    // Only set template override if it is a valid template (= it exists and is enabled)
    if (!empty($template_override)) {
        if (is_file(JPATH_THEMES . '/' . $template_override . '/index.php')) {
            foreach ($templates as $tmpl) {
                if ($tmpl->template === $template_override) {
                    $template = $tmpl;
                    break;
                }
            }
        }
    }
    // Need to filter the default value as well
    $template->template = InputFilter::getInstance()->clean($template->template, 'cmd');
    // Fallback template
    if (!empty($template->parent)) {
        if (!is_file(JPATH_THEMES . '/' . $template->template . '/index.php')) {
            if (!is_file(JPATH_THEMES . '/' . $template->parent . '/index.php')) {
                $this->enqueueMessage(Text::_('JERROR_ALERTNOTEMPLATE'), 'error');
                // Try to find data for 'cassiopeia' template
                $original_tmpl = $template->template;
                foreach ($templates as $tmpl) {
                    if ($tmpl->template === 'cassiopeia') {
                        $template = $tmpl;
                        break;
                    }
                }
                // Check, the data were found and if template really exists
                if (!is_file(JPATH_THEMES . '/' . $template->template . '/index.php')) {
                    throw new \InvalidArgumentException(Text::sprintf('JERROR_COULD_NOT_FIND_TEMPLATE', $original_tmpl));
                }
            }
        }
    } elseif (!is_file(JPATH_THEMES . '/' . $template->template . '/index.php')) {
        $this->enqueueMessage(Text::_('JERROR_ALERTNOTEMPLATE'), 'error');
        // Try to find data for 'cassiopeia' template
        $original_tmpl = $template->template;
        foreach ($templates as $tmpl) {
            if ($tmpl->template === 'cassiopeia') {
                $template = $tmpl;
                break;
            }
        }
        // Check, the data were found and if template really exists
        if (!is_file(JPATH_THEMES . '/' . $template->template . '/index.php')) {
            throw new \InvalidArgumentException(Text::sprintf('JERROR_COULD_NOT_FIND_TEMPLATE', $original_tmpl));
        }
    }
    // Cache the result
    $this->template = $template;
    if ($params) {
        return $template;
    }
    return $template->template;
}