<?php

declare(strict_types=1);

/*
 * Copyright (C) 2021 Daniel Siepmann <coding@daniel-siepmann.de>
 *
 * 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.
 */

namespace DanielSiepmann\DsSite\Frontend\RssFeed;

use Exception;
use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
use TYPO3\CMS\Frontend\ContentObject\DataProcessorInterface;
use TYPO3\CMS\Frontend\DataProcessing\DatabaseQueryProcessor;

final class BlogPostsDataProvider implements DataProcessorInterface
{
    public function __construct(
        private readonly DatabaseQueryProcessor $databaseQueryProcessor,
        private readonly ConnectionPool $connectionPool
    ) {
    }

    public function process(
        ContentObjectRenderer $contentObjectRenderer,
        array $contentObjectConfiguration,
        array $processorConfiguration,
        array $processedData
    ) {
        $processedData = $this->databaseQueryProcessor->process(
            $contentObjectRenderer,
            $contentObjectConfiguration,
            array_merge($processorConfiguration, [
                'uidInList' => $this->getPageUids($contentObjectRenderer->getRequest()),
            ]),
            $processedData
        );

        foreach ($processedData['pages'] as &$page) {
            $page['description'] = $page['data']['abstract']
                . $this->getContent(
                    $contentObjectRenderer,
                    $page['data']['uid']
                );
        }

        return $processedData;
    }

    private function getPageUids(ServerRequestInterface $request): string
    {
        $categoryUid = (int) ($request->getQueryParams()['category_uid'] ?? 0);
        if ($categoryUid === 0) {
            return '';
        }

        return implode(',', $this->getPageUidsWithRelationToCategory($categoryUid));
    }

    private function getPageUidsWithRelationToCategory(int $categoryUid): array
    {
        $queryBuilder = $this->connectionPool->getQueryBuilderForTable('pages');

        $queryBuilder->select('uid');
        $queryBuilder->from('pages');
        $queryBuilder->leftJoin(
            'pages',
            'sys_category_record_mm',
            'mm',
            'pages.uid = mm.uid_foreign'
        );
        $queryBuilder->where(
            $queryBuilder->expr()->eq(
                'mm.tablenames',
                $queryBuilder->createNamedParameter('pages')
            ),
            $queryBuilder->expr()->eq(
                'mm.fieldname',
                $queryBuilder->createNamedParameter('categories')
            ),
            $queryBuilder->expr()->in(
                'mm.uid_local',
                $queryBuilder->createNamedParameter($categoryUid)
            )
        );

        return array_map(static function (array $row) {
            if (is_numeric($row['uid'])) {
                return (int) $row['uid'];
            }
            throw new Exception('UID was not numeric: ' . var_export($row['uid'], true), 1707325559);
        }, $queryBuilder->executeQuery()->fetchAllAssociative());
    }

    private function getContent(
        ContentObjectRenderer $contentObjectRenderer,
        int $pageUid
    ): string {
        $colPositions = [
            50,
            0,
            100,
            200,
        ];

        $content = '';
        foreach ($colPositions as $colPos) {
            $content .= $contentObjectRenderer->cObjGetSingle('CONTENT', [
                'table' => 'tt_content',
                'select.' => [
                    'orderBy' => 'sorting',
                    'where' => '{#colPos}=' . $colPos,
                    'pidInList' => $pageUid,
                ],
            ]);
        }

        return $content;
    }
}