TYPO3ContentElements/Classes/ViewHelpers/SkillGroupingViewHelper.php

<?php

declare(strict_types=1);

namespace SkillDisplay\SkilldisplayContent\ViewHelpers;

/*
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

use Closure;
use SkillDisplay\PHPToolKit\Entity\Skill;
use SkillDisplay\PHPToolKit\Entity\SkillSet;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;

/**
 * Usage:
 *
 * <sd:skillGrouping skillSet="{skillSet}" as="domainGroup">
 *   {domainGroup.title}<br />
 *   <f:for each="{domainGroup.skills}" as="skill">
 *     {skill.name}<br />
 *   </f:for>
 * </sd:skillGrouping>
 */
class SkillGroupingViewHelper extends AbstractViewHelper
{
    use CompileWithRenderStatic;

    protected $escapeOutput = false;

    public function initializeArguments()
    {
        $this->registerArgument('skills', 'array', 'An array of skills to group', false, []);
        $this->registerArgument('skillSet', SkillSet::class, 'The skills of this skill set will be grouped');
        $this->registerArgument('as', 'string', 'The name of the iteration variable', true);
    }

    public static function renderStatic(
        array                     $arguments,
        Closure                   $renderChildrenClosure,
        RenderingContextInterface $renderingContext
    )
    {
        /** @var Skill[] $skills */
        $skills = $arguments['skills'];
        /** @var SkillSet|null $skillSet */
        $skillSet = $arguments['skillSet'];
        $as = $arguments['as'];

        if ($skillSet) {
            $groups = self::group($skillSet->getSkills());
        } else {
            $groups = self::group($skills);
        }

        $templateVariableContainer = $renderingContext->getVariableProvider();
        $output = '';
        foreach ($groups as $group) {
            $templateVariableContainer->add($as, $group);
            $output .= $renderChildrenClosure();
            $templateVariableContainer->remove($as);
        }
        return $output;
    }

    /**
     * @param Skill[] $skills
     * @return array
     */
    protected static function group(array $skills): array
    {
        $domainTags = [];
        foreach ($skills as $skill) {
            $domainTags[] = isset($skill->toArray()['domainTag']) ? $skill->toArray()['domainTag']['title'] : "none";
        }
        $domainTags = array_unique($domainTags);

        $result = [];
        foreach ($domainTags as $domainTag) {
            $result[] = [
                'title' => $domainTag,
                'skills' => array_filter($skills, function (Skill $skill) use ($domainTag) {
                    if (!isset($skill->toArray()['domainTag'])) {
                        return $domainTag === "none";
                    }
                    return $skill->toArray()['domainTag']['title'] === $domainTag;
                })
            ];
        }
        return $result;
    }
}