<?php

declare(strict_types=1);

namespace Evomedien\Vitec\UserFunc;

use Doctrine\DBAL\ParameterType;
use Evomedien\Vitec\Service\UsecaseSerializer;
use TYPO3\CMS\Core\Attribute\AsAllowedCallable;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Service\FlexFormService;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * UserFunc: render a single Success Story as JSON (headless).
 *
 * The story is chosen from the plugin FlexForm (settings.usecase) or, when
 * empty, from the request param tx_vitec_usecaseshow[usecase] (uid or slug).
 * Full serialisation is delegated to UsecaseSerializer. Exception-safe.
 */
class UsecaseShowJsonRenderer
{
    private const TABLE = 'tx_vitec_domain_model_usecase';

    #[AsAllowedCallable]
    public function render(string $content, array $conf): string
    {
        $row = is_array($this->cObj->data ?? null) ? $this->cObj->data : null;
        if ($row && (string)($row['CType'] ?? '') === 'vitec_usecaseshow') {
            return $this->renderForRecord($row);
        }

        $pageId = 0;
        $request = $GLOBALS['TYPO3_REQUEST'] ?? null;
        if ($request !== null) {
            $pageInfo = $request->getAttribute('frontend.page.information');
            if ($pageInfo !== null) {
                $pageId = (int)$pageInfo->getId();
            }
        }
        if ($pageId <= 0) {
            $pageId = (int)($GLOBALS['TSFE']->id ?? 0);
        }
        if ($pageId <= 0) {
            return '';
        }

        $qb = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('tt_content');
        $ces = $qb
            ->select('*')
            ->from('tt_content')
            ->where(
                $qb->expr()->eq('pid', $qb->createNamedParameter($pageId, ParameterType::INTEGER)),
                $qb->expr()->eq('CType', $qb->createNamedParameter('vitec_usecaseshow', ParameterType::STRING)),
                $qb->expr()->eq('deleted', 0),
                $qb->expr()->eq('hidden', 0)
            )
            ->executeQuery()
            ->fetchAllAssociative();

        if (empty($ces)) {
            return '';
        }

        return $this->renderForRecord($ces[0]);
    }

    /**
     * @param array<string,mixed> $contentElement
     */
    public function renderForRecord(array $contentElement): string
    {
        try {
            $flexFormService = GeneralUtility::makeInstance(FlexFormService::class);
            $flexFormData = $flexFormService->convertFlexFormContentToArray($contentElement['pi_flexform'] ?? '');
            $settings = $flexFormData['settings'] ?? [];

            $layout    = (string)($settings['layout'] ?? 'default');
            $debugMode = (bool)($settings['debug'] ?? false);
            $usecaseUid = (int)($settings['usecase'] ?? 0);

            // Fallback: uid/slug from the request (React detail route).
            if (!$usecaseUid) {
                $params = $GLOBALS['TYPO3_REQUEST']?->getQueryParams() ?? [];
                $param = $params['tx_vitec_usecaseshow']['usecase'] ?? null;
                if ($param !== null && $param !== '') {
                    $usecaseUid = is_numeric($param) ? (int)$param : $this->resolveSlug((string)$param);
                }
            }

            if (!$usecaseUid) {
                return $debugMode
                    ? (string)json_encode(['error' => 'No usecase selected or found', 'debug' => ['settings' => $settings]])
                    : '';
            }

            $qb = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable(self::TABLE);
            $usecase = $qb
                ->select('*')
                ->from(self::TABLE)
                ->where(
                    $qb->expr()->eq('uid', $qb->createNamedParameter($usecaseUid, ParameterType::INTEGER)),
                    $qb->expr()->eq('deleted', 0),
                    $qb->expr()->eq('hidden', 0)
                )
                ->executeQuery()
                ->fetchAssociative();

            if (!$usecase) {
                return $debugMode
                    ? (string)json_encode(['error' => 'Usecase not found', 'debug' => ['usecaseUid' => $usecaseUid]])
                    : '';
            }

            $serializer = GeneralUtility::makeInstance(UsecaseSerializer::class);

            $response = [
                'usecase' => $serializer->serializeDetail($usecase),
                'layout'  => $layout,
            ];

            if ($debugMode) {
                $response['debug'] = ['usecaseUid' => $usecaseUid, 'layout' => $layout, 'settings' => $settings];
            }

            return (string)json_encode($response);
        } catch (\Throwable $e) {
            return '';
        }
    }

    private function resolveSlug(string $slug): int
    {
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable(self::TABLE);
        $row = $qb
            ->select('uid')
            ->from(self::TABLE)
            ->where(
                $qb->expr()->eq('slug', $qb->createNamedParameter($slug)),
                $qb->expr()->eq('deleted', 0),
                $qb->expr()->eq('hidden', 0)
            )
            ->executeQuery()
            ->fetchAssociative();

        return (int)($row['uid'] ?? 0);
    }
}