<?php

declare(strict_types=1);

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Backend\Preview;

use Psr\Log\LoggerInterface;
use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Backend\View\Event\PageContentPreviewRenderingEvent;
use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Core\Authentication\BackendUserAuthentication;
use TYPO3\CMS\Core\Core\Environment;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\View\ViewFactoryData;
use TYPO3\CMS\Core\View\ViewFactoryInterface;

/**
 * Check if a Fluid-based preview template was defined for a given CType and render it via Fluid.
 *
 * Example in page TSconfig:
 * mod.web_layout.tt_content.preview.textmedia = EXT:site_mysite/Resources/Private/Templates/Preview/Textmedia.fluid.html
 *
 * @internal not part of the TYPO3 Core API
 */
final readonly class FluidBasedContentPreviewRenderer
{
    public function __construct(
        private LoggerInterface $logger,
        private ViewFactoryInterface $viewFactory,
    ) {}

    #[AsEventListener('typo3-backend/fluid-preview/content')]
    public function __invoke(PageContentPreviewRenderingEvent $event): void
    {
        $record = $event->getRecord();
        $context = $event->getPageLayoutContext();
        $fluidTemplateFile = BackendUtility::getPagesTSconfig($record->getPid())['mod.']['web_layout.'][$event->getTable() . '.']['preview.'][$event->getRecordType()] ?? '';
        if ($fluidTemplateFile === '') {
            return;
        }

        $fluidTemplateFileAbsolutePath = GeneralUtility::getFileAbsFileName($fluidTemplateFile);
        if ($fluidTemplateFileAbsolutePath === '') {
            return;
        }
        try {
            $event->setPreviewContent(
                $this->viewFactory
                    ->create(new ViewFactoryData(templatePathAndFilename: $fluidTemplateFileAbsolutePath, request: $context->getCurrentRequest()))
                    ->assign('record', $record)
                    ->render()
            );
        } catch (\Exception $e) {
            $this->logger->warning('The backend preview for content element {uid} can not be rendered using the Fluid template file "{file}"', [
                'uid' => $record->getUid(),
                'file' => $fluidTemplateFileAbsolutePath,
                'exception' => $e,
            ]);
            if ($this->getBackendUser()->shallDisplayDebugInformation()) {
                $event->setPreviewContent(
                    $this->viewFactory
                        ->create(new ViewFactoryData(templatePathAndFilename: 'EXT:backend/Resources/Private/Templates/PageLayout/FluidBasedContentPreviewRenderingException.fluid.html'))
                        ->assign('error', [
                            'message' => str_replace(Environment::getProjectPath(), '', $e->getMessage()),
                            'title' => 'Error while rendering FluidTemplate preview using ' . str_replace(Environment::getProjectPath(), '', $fluidTemplateFileAbsolutePath),
                        ])
                        ->render()
                );
            }
        }
    }

    private function getBackendUser(): BackendUserAuthentication
    {
        return $GLOBALS['BE_USER'];
    }
}