<?php

namespace DigiComp\Menu\ViewHelpers;

/*
 * This file is part of the DigiComp.Menu package.
 *
 * (c) digital competence
 *
 * This package is Open Source Software. For the full copyright and license
 * information, please view the LICENSE file which was distributed with this
 * source code.
 */

use Neos\FluidAdaptor\Core\ViewHelper\AbstractViewHelper;
use Neos\FluidAdaptor\Core\ViewHelper\Exception;

/**
 * Helps to get useful template variables for process menus
 */
class ProgressViewHelper extends AbstractViewHelper
{
    protected $escapeOutput = false;

    /**
     * @throws Exception
     */
    public function initializeArguments(): void
    {
        $this->registerArgument('for', 'string', 'path in Menu.yaml', false);
        $this->registerArgument('as', 'string', 'Name in Frontend', false);
        $this->registerArgument('links', 'array', 'links to show', true);
        $this->registerArgument('activeStep', 'int', 'current active link index', false, 1);
        $this->registerArgument('returnable', 'bool', 'can you go back to the last index', false, true);
        $this->registerArgument('stepsAs', 'string', 'variable name of a single step', false, 'steps');
        $this->registerArgument('backLinkAs', 'string', 'variable name of a backlink', false, 'backLink');
        $this->registerArgument('linksAs', 'string', 'variable name of the links array', false, 'links');
        $this->registerArgument(
            'activeStepLinkAs',
            'string',
            'variable name of the active step link',
            false,
            'activeStepLink'
        );
        $this->registerArgument('offset', 'int', 'offset to start with', false, 1);
        $this->registerArgument('linkCount', 'int', 'force this number of steps', false);
    }

    /**
     * @return mixed
     */
    public function render()
    {
        $links = $activeStep = $returnable = $stepsAs = $backLinkAs = $activeStepAs = $linksAs =
            $activeStepLinkAs = $offset = $linkCount = null;
        extract($this->arguments);
        //handling famous off by one
        $activeStep -= $offset;
        //make sure our array index is numeric
        $links = array_values($links);
        if (!$linkCount) {
            $linkCount = count($links);
        }
        foreach ($links as $i => &$link) {
            $link['completed'] = $activeStep > $i;
            $link['returnable'] = $returnable && $i < $activeStep;
        }
        $this->templateVariableContainer->add($linksAs, $links);
        $this->templateVariableContainer->add($stepsAs, $linkCount);
        $this->templateVariableContainer->add($activeStepAs, $activeStep + $offset);
        $this->templateVariableContainer->add($activeStepLinkAs, $links[$activeStep]);
        if (isset($links[$activeStep - 1])) {
            $this->templateVariableContainer->add($backLinkAs, $links[$activeStep - 1]);
        }
        return $this->renderChildren();
    }
}