<?php

declare(strict_types=1);

namespace Evomedien\Vitec\UserFunc;

use Evomedien\Vitec\Service\StructuredDataService;
use TYPO3\CMS\Core\Attribute\AsAllowedCallable;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Resource\ResourceFactory;
use TYPO3\CMS\Extbase\Service\ImageService;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use Doctrine\DBAL\ParameterType;

/**
 * Emits the page-level schema.org @graph (Organization, WebSite,
 * BreadcrumbList, NewsArticle) as a JSON-LD string for the headless page
 * object. Wired in setup.typoscript as:
 *
 *   page.10.fields.jsonLd = USER
 *   page.10.fields.jsonLd.userFunc = Evomedien\Vitec\UserFunc\PageJsonLdRenderer->render
 *
 * The JS frontend wraps the returned string in
 * `<script type="application/ld+json">…</script>` inside the page <head>.
 *
 * Organization data is pulled from site settings (category "seo"); the
 * canonical absolute base URL likewise (with a request-host fallback) because
 * the headless site base is "/".
 *
 * Exception-safe: returns '' on any failure, never breaks the page JSON.
 */
final class PageJsonLdRenderer
{
    /** News-detail backend layouts (see BackendLayoutDataProvider::LAYOUT_MAP). */
    private const NEWS_DETAIL_LAYOUTS = [13, 14, 15];

    #[AsAllowedCallable]
    public function render(string $content, array $conf): string
    {
        try {
            $request = $GLOBALS['TYPO3_REQUEST'] ?? null;
            if ($request === null) {
                return '';
            }

            $pageInfo = $request->getAttribute('frontend.page.information');
            if ($pageInfo === null) {
                return '';
            }

            $pageId = (int)$pageInfo->getId();
            $pageRecord = $pageInfo->getPageRecord();
            $rootLine = $pageInfo->getRootLine();

            $site = $request->getAttribute('site');
            $settings = $site?->getSettings();
            $base = $this->resolveCanonicalBase($request, $settings);

            $service = GeneralUtility::makeInstance(StructuredDataService::class);

            $orgCfg = $this->organizationConfig($settings, $base);
            $hasOrganization = ($orgCfg['name'] ?? '') !== '';

            $nodes = [];

            // Organization on every page (anchors @id references).
            if ($hasOrganization) {
                $nodes[] = $service->buildOrganization($orgCfg);
            }

            // WebSite only on the site root / home page.
            $isHome = $site !== null && $pageId === (int)$site->getRootPageId();
            if ($isHome) {
                $siteName = (string)($settings?->get('seo.site.name') ?? '');
                if ($siteName === '') {
                    $siteName = (string)($orgCfg['name'] ?? '');
                }
                $nodes[] = $service->buildWebSite($base, $siteName, $hasOrganization);
            }

            // BreadcrumbList from the rootline.
            $breadcrumb = $service->buildBreadcrumbList($this->breadcrumbItems($rootLine), $base);
            if ($breadcrumb !== null) {
                $nodes[] = $breadcrumb;
            }

            // NewsArticle on news-detail pages.
            if (in_array((int)($pageRecord['layout'] ?? 0), self::NEWS_DETAIL_LAYOUTS, true)) {
                $nodes[] = $service->buildNewsArticle(
                    $pageRecord,
                    $base,
                    $this->pageMediaUrls($pageId, $base, $service),
                    $hasOrganization
                );
            }
            // FAQPage when the page contains at least one vitec_faq element.
            $faqItems = $this->collectFaqItems($pageId);
            if ($faqItems !== []) {
                $nodes[] = $service->buildFaqPage($faqItems, $base);
            }
            // Event nodes when the page contains a vitec_eventlist element.
            foreach ($this->collectUpcomingEvents($pageId) as $eventRow) {
                $nodes[] = $service->buildEvent(
                    $eventRow,
                    $base,
                    $this->eventImageUrls((int)$eventRow['uid'], $base, $service),
                    $hasOrganization
                );
            }


            return $service->encodeGraph($nodes);
        } catch (\Throwable $e) {
            return '';
        }
    }

    /**
     * Canonical absolute base, e.g. "https://www.vitec.com".
     * Prefers the explicit site setting, falls back to the request host.
     */
    private function resolveCanonicalBase($request, $settings): string
    {
        $configured = trim((string)($settings?->get('seo.site.canonicalBase') ?? ''));
        if ($configured !== '') {
            return rtrim($configured, '/');
        }

        $normalizedParams = $request->getAttribute('normalizedParams');
        if ($normalizedParams !== null) {
            return rtrim($normalizedParams->getSiteUrl(), '/');
        }

        return '';
    }

    /**
     * Assemble the Organization config from site settings.
     *
     * @return array<string,mixed>
     */
    private function organizationConfig($settings, string $base): array
    {
        $get = static fn (string $key): string => trim((string)($settings?->get($key) ?? ''));

        $sameAsRaw = $get('seo.organization.sameAs');
        $sameAs = $sameAsRaw !== ''
            ? array_filter(array_map('trim', preg_split('/[\r\n,]+/', $sameAsRaw) ?: []))
            : [];

        return [
            'name' => $get('seo.organization.name'),
            'legalName' => $get('seo.organization.legalName'),
            'base' => $base,
            'logoUrl' => $get('seo.organization.logoUrl'),
            'sameAs' => array_values($sameAs),
            'email' => $get('seo.organization.email'),
            'phone' => $get('seo.organization.phone'),
            'street' => $get('seo.organization.street'),
            'postalCode' => $get('seo.organization.postalCode'),
            'locality' => $get('seo.organization.locality'),
            'country' => $get('seo.organization.country'),
        ];
    }

    /**
     * Build ordered breadcrumb items (root → current) from the rootline.
     * Skips spacers, folders and recyclers; uses nav_title with title fallback.
     *
     * @param array<int,array<string,mixed>> $rootLine
     * @return list<array{name:string, url:string}>
     */
    private function breadcrumbItems(array $rootLine): array
    {
        $skipDoktypes = [199, 254, 255];
        $items = [];

        // Rootline is ordered current → root; reverse for breadcrumb order.
        foreach (array_reverse($rootLine) as $page) {
            $doktype = (int)($page['doktype'] ?? 1);
            if (in_array($doktype, $skipDoktypes, true)) {
                continue;
            }
            // Matches the visible headless breadcrumb (HMENU special=rootline),
            // which keeps nav_hide pages for path integrity.
            $name = trim((string)($page['nav_title'] ?? '')) ?: trim((string)($page['title'] ?? ''));
            if ($name === '') {
                continue;
            }
            $items[] = [
                'name' => $name,
                'url' => (string)($page['slug'] ?? ''),
            ];
        }

        return $items;
    }

    /**
     * Absolute URLs of the page's `media` images (used as NewsArticle image).
     *
     * @return string[]
     */
    private function pageMediaUrls(int $pageId, string $base, StructuredDataService $service): array
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('sys_file_reference');

        $rows = $queryBuilder
            ->select('uid')
            ->from('sys_file_reference')
            ->where(
                $queryBuilder->expr()->eq('uid_foreign', $queryBuilder->createNamedParameter($pageId, ParameterType::INTEGER)),
                $queryBuilder->expr()->eq('tablenames', $queryBuilder->createNamedParameter('pages', ParameterType::STRING)),
                $queryBuilder->expr()->eq('fieldname', $queryBuilder->createNamedParameter('media', ParameterType::STRING)),
                $queryBuilder->expr()->eq('deleted', 0),
                $queryBuilder->expr()->eq('hidden', 0)
            )
            ->orderBy('sorting_foreign', 'ASC')
            ->executeQuery()
            ->fetchAllAssociative();

        if ($rows === []) {
            return [];
        }

        $resourceFactory = GeneralUtility::makeInstance(ResourceFactory::class);
        $imageService = GeneralUtility::makeInstance(ImageService::class);
        $urls = [];

        foreach ($rows as $row) {
            try {
                $fileReference = $resourceFactory->getFileReferenceObject((int)$row['uid']);
                $processed = $imageService->applyProcessingInstructions($fileReference, ['width' => 1200]);
                $urls[] = $service->absUrl($imageService->getImageUri($processed), $base);
            } catch (\Throwable $e) {
                continue;
            }
        }

        return $urls;
    }

    /**
     * Collect question/answer pairs from all visible vitec_faq elements on
     * this page (Content Blocks collection child table).
     *
     * @return list<array{question:string,answer:string}>
     */
    private function collectFaqItems(int $pageId): array
    {
        try {
            $qb = GeneralUtility::makeInstance(ConnectionPool::class)
                ->getQueryBuilderForTable('tt_content');
            $elements = $qb
                ->select('uid')
                ->from('tt_content')
                ->where(
                    $qb->expr()->eq('pid', $qb->createNamedParameter($pageId, ParameterType::INTEGER)),
                    $qb->expr()->eq('CType', $qb->createNamedParameter('vitec_faq', ParameterType::STRING)),
                    $qb->expr()->eq('deleted', 0),
                    $qb->expr()->eq('hidden', 0)
                )
                ->executeQuery()
                ->fetchAllAssociative();

            if ($elements === []) {
                return [];
            }

            $items = [];
            foreach ($elements as $element) {
                $childQb = GeneralUtility::makeInstance(ConnectionPool::class)
                    ->getQueryBuilderForTable('vitec_faq_items');
                $rows = $childQb
                    ->select('*')
                    ->from('vitec_faq_items')
                    ->where(
                        $childQb->expr()->eq('foreign_table_parent_uid', $childQb->createNamedParameter((int)$element['uid'], ParameterType::INTEGER)),
                        $childQb->expr()->eq('deleted', 0),
                        $childQb->expr()->eq('hidden', 0)
                    )
                    ->orderBy('sorting', 'ASC')
                    ->executeQuery()
                    ->fetchAllAssociative();

                foreach ($rows as $row) {
                    $items[] = [
                        'question' => (string)($row['question'] ?? $row['vitec_question'] ?? ''),
                        'answer' => (string)($row['answer'] ?? $row['vitec_answer'] ?? ''),
                    ];
                }
            }

            return $items;
        } catch (\Throwable $e) {
            // Table may not exist yet (schema not updated) — skip silently.
            return [];
        }
    }


    /**
     * Upcoming event rows when this page contains at least one visible
     * vitec_eventlist element. Empty array otherwise.
     *
     * @return list<array<string,mixed>>
     */
    private function collectUpcomingEvents(int $pageId): array
    {
        try {
            $qb = GeneralUtility::makeInstance(ConnectionPool::class)
                ->getQueryBuilderForTable('tt_content');
            $eventlistElement = $qb
                ->select('uid', 'pi_flexform')
                ->from('tt_content')
                ->where(
                    $qb->expr()->eq('pid', $qb->createNamedParameter($pageId, ParameterType::INTEGER)),
                    $qb->expr()->eq('CType', $qb->createNamedParameter('vitec_eventlist', ParameterType::STRING)),
                    $qb->expr()->eq('deleted', 0),
                    $qb->expr()->eq('hidden', 0)
                )
                ->setMaxResults(1)
                ->executeQuery()
                ->fetchAssociative();

            if (!$eventlistElement) {
                return [];
            }

            // Mirror the plugin's "days in advance" window so structured data
            // matches what the page actually shows.
            $daysInAdvance = 0;
            $flexFormService = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Service\FlexFormService::class);
            $flexSettings = $flexFormService->convertFlexFormContentToArray((string)($eventlistElement['pi_flexform'] ?? ''))['settings'] ?? [];
            $daysInAdvance = (int)($flexSettings['daysinadvance'] ?? 0);

            $todayMidnight = strtotime('today');
            $eventQb = GeneralUtility::makeInstance(ConnectionPool::class)
                ->getQueryBuilderForTable('tx_vitec_domain_model_event');
            $expr = $eventQb->expr();

            $eventQb
                ->select('*')
                ->from('tx_vitec_domain_model_event')
                ->where(
                    $expr->eq('deleted', 0),
                    $expr->eq('hidden', 0),
                    $expr->eq('hideonwebsite', 0),
                    $expr->or(
                        $expr->gte('eventend', $eventQb->createNamedParameter($todayMidnight, ParameterType::INTEGER)),
                        $expr->and(
                            $expr->eq('eventend', 0),
                            $expr->gte('eventstart', $eventQb->createNamedParameter($todayMidnight, ParameterType::INTEGER))
                        )
                    )
                )
                ->orderBy('eventstart', 'ASC');

            if ($daysInAdvance > 0) {
                $eventQb->andWhere(
                    $expr->lt('eventstart', $eventQb->createNamedParameter($todayMidnight + ($daysInAdvance * 86400), ParameterType::INTEGER))
                );
            }

            return $eventQb->executeQuery()->fetchAllAssociative();
        } catch (\Throwable $e) {
            // Table may not exist yet — skip silently.
            return [];
        }
    }

    /**
     * Root-relative logo URLs for an event (fieldname=image).
     *
     * @return list<string>
     */
    private function eventImageUrls(int $eventUid, string $base, $service): array
    {
        try {
            $qb = GeneralUtility::makeInstance(ConnectionPool::class)
                ->getQueryBuilderForTable('sys_file_reference');
            $rows = $qb
                ->select('f.identifier')
                ->from('sys_file_reference', 'fr')
                ->join('fr', 'sys_file', 'f', 'fr.uid_local = f.uid')
                ->where(
                    $qb->expr()->eq('fr.tablenames', $qb->createNamedParameter('tx_vitec_domain_model_event', ParameterType::STRING)),
                    $qb->expr()->eq('fr.fieldname', $qb->createNamedParameter('image', ParameterType::STRING)),
                    $qb->expr()->eq('fr.uid_foreign', $qb->createNamedParameter($eventUid, ParameterType::INTEGER)),
                    $qb->expr()->eq('fr.deleted', 0),
                    $qb->expr()->eq('f.missing', 0)
                )
                ->executeQuery()
                ->fetchAllAssociative();

            $urls = [];
            foreach ($rows as $row) {
                $identifier = (string)($row['identifier'] ?? '');
                if ($identifier !== '') {
                    $urls[] = '/fileadmin' . $identifier;
                }
            }
            return $urls;
        } catch (\Throwable $e) {
            return [];
        }
    }

}