<?php

declare(strict_types=1);

namespace Evomedien\Vitec\UserFunc;


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

/**
 * UserFunc to render the Downloadcard plugin as JSON for headless output.
 *
 * Behaviour:
 *  - settings.download set            -> single download object   (key: "download")
 *  - else settings.product set        -> all downloads of that product (key: "downloads",
 *                                       plus a small "product" context)
 *  - neither                           -> empty (key removed by headless ifEmptyUnsetKey)
 *
 * `settings.layout` / magstyle / magheader / magtext / maglink / adddetaillink
 * are always passed through under the "settings" block for the frontend.
 *
 * `render()` performs page discovery; `renderForRecord()` processes a specific
 * tt_content row and is reused by ContainerChildrenProcessor /
 * ContentElementResolver. Exception-safe.
 */
class DownloadcardJsonRenderer
{
    #[AsAllowedCallable]
    public function render(string $content, array $conf): string
    {
        
        $pageId = 0;
        $req = $GLOBALS["TYPO3_REQUEST"] ?? null;
        if ($req !== null) {
            $pi = $req->getAttribute("frontend.page.information");
            if ($pi !== null) { $pageId = (int)$pi->getId(); }
        }
        if ($pageId <= 0) { $pageId = (int)($GLOBALS["TSFE"]->id ?? 0); }

        $qb = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('tt_content');

        // After v14 migration the CType is the plugin signature; for legacy
        // (unmigrated) records the CType is still "list" with list_type set.
        $rows = $qb
            ->select('*')
            ->from('tt_content')
            ->where(
                $qb->expr()->eq('pid', $qb->createNamedParameter($pageId, ParameterType::INTEGER)),
                $qb->expr()->or(
                    $qb->expr()->eq('CType', $qb->createNamedParameter('vitec_downloadcard', ParameterType::STRING)),
                    $qb->expr()->and(
                        $qb->expr()->eq('CType', $qb->createNamedParameter('list', ParameterType::STRING)),
                        $qb->expr()->eq('CType', $qb->createNamedParameter('vitec_downloadcard', ParameterType::STRING))
                    )
                ),
                $qb->expr()->eq('deleted', 0),
                $qb->expr()->eq('hidden', 0)
            )
            ->executeQuery()
            ->fetchAllAssociative();

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

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

    /**
     * @param array<string,mixed> $contentElement
     */
    public function renderForRecord(array $contentElement): string
    {
        try {
            $pageId = (int)($GLOBALS['TSFE']->id ?? 0);

            $flexFormService = GeneralUtility::makeInstance(FlexFormService::class);
            $flexFormData = $flexFormService->convertFlexFormContentToArray($contentElement['pi_flexform'] ?? '');
            $settings = $flexFormData['settings'] ?? [];

            $downloadUid = (int)($settings['download'] ?? 0);
            $productUid  = (int)($settings['product'] ?? 0);
            $debugMode   = (bool)($settings['debug'] ?? false);

            // Settings always carried through to the frontend
            $settingsOut = [
                'layout'         => (string)($settings['layout'] ?? ''),
                'magstyle'       => (bool)($settings['magstyle'] ?? false),
                'magheader'      => (string)($settings['magheader'] ?? ''),
                'magtext'        => (string)($settings['magtext'] ?? ''),
                'maglink'        => (string)($settings['maglink'] ?? ''),
                'adddetaillink'  => (bool)($settings['adddetaillink'] ?? false),
            ];

            // --- Mode 1: single download ---
            if ($downloadUid > 0) {
                $download = $this->fetchDownload($downloadUid);
                if (!$download) {
                    return $debugMode
                        ? json_encode(['error' => 'Download not found', 'debug' => ['downloadUid' => $downloadUid]])
                        : '';
                }

                $response = [
                    'mode'     => 'single',
                    'download' => $this->serializeDownload($download),
                    'settings' => $settingsOut,
                ];
                if ($debugMode) {
                    $response['debug'] = [
                        'pageId' => $pageId, 'downloadUid' => $downloadUid, 'settings' => $settings,
                    ];
                }
                return json_encode($response);
            }

            // --- Mode 2: all downloads of a product ---
            if ($productUid > 0) {
                $downloads = $this->fetchDownloadsForProduct($productUid);
                $product   = $this->fetchProductContext($productUid);

                $response = [
                    'mode'      => 'product-downloads',
                    'product'   => $product,
                    'downloads' => array_map(fn($r) => $this->serializeDownload($r), $downloads),
                    'settings'  => $settingsOut,
                ];
                if ($debugMode) {
                    $response['debug'] = [
                        'pageId' => $pageId,
                        'productUid' => $productUid,
                        'downloadCount' => count($downloads),
                        'settings' => $settings,
                    ];
                }
                return json_encode($response);
            }

            // Neither selected: nothing to render.
            return $debugMode
                ? json_encode(['error' => 'No download or product selected', 'debug' => ['settings' => $settings]])
                : '';
        } catch (\Throwable $e) {
            return '';
        }
    }

    /**
     * @return array<string,mixed>|false
     */
    private function fetchDownload(int $uid)
    {
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('tx_vitec_domain_model_download');

        return $qb
            ->select('*')
            ->from('tx_vitec_domain_model_download')
            ->where(
                $qb->expr()->eq('uid', $qb->createNamedParameter($uid, ParameterType::INTEGER)),
                $qb->expr()->eq('deleted', 0),
                $qb->expr()->eq('hidden', 0),
                $qb->expr()->eq('hideonwebsite', 0)
            )
            ->executeQuery()
            ->fetchAssociative();
    }

    /**
     * @return array<int,array<string,mixed>>
     */
    private function fetchDownloadsForProduct(int $productUid): array
    {
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('tx_vitec_domain_model_download');

        return $qb
            ->select('d.*')
            ->from('tx_vitec_domain_model_download', 'd')
            ->join('d', 'tx_vitec_product_download_mm', 'mm', 'mm.uid_foreign = d.uid')
            ->where(
                $qb->expr()->eq('mm.uid_local', $qb->createNamedParameter($productUid, ParameterType::INTEGER)),
                $qb->expr()->eq('d.deleted', 0),
                $qb->expr()->eq('d.hidden', 0),
                $qb->expr()->eq('d.hideonwebsite', 0)
            )
            ->orderBy('mm.sorting', 'ASC')
            ->executeQuery()
            ->fetchAllAssociative();
    }

    /**
     * @return array<string,mixed>|null
     */
    private function fetchProductContext(int $productUid): ?array
    {
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('tx_vitec_domain_model_product');

        $row = $qb
            ->select('uid', 'title', 'slug', 'subtitle', 'teaser')
            ->from('tx_vitec_domain_model_product')
            ->where(
                $qb->expr()->eq('uid', $qb->createNamedParameter($productUid, ParameterType::INTEGER)),
                $qb->expr()->eq('deleted', 0),
                $qb->expr()->eq('hidden', 0)
            )
            ->executeQuery()
            ->fetchAssociative();

        if (!$row) {
            return null;
        }

        return [
            'uid'      => (int)$row['uid'],
            'title'    => (string)($row['title'] ?? ''),
            'slug'     => (string)($row['slug'] ?? ''),
            'subtitle' => (string)($row['subtitle'] ?? ''),
            'teaser'   => (string)($row['teaser'] ?? ''),
            'link'     => '/product/' . (string)($row['slug'] ?? ''),
        ];
    }

    /**
     * @param array<string,mixed> $download
     * @return array<string,mixed>
     */
    protected function serializeDownload(array $download): array
    {
        $uid = (int)$download['uid'];

        return [
            'uid'              => $uid,
            'title'            => (string)($download['title'] ?? ''),
            'slug'             => (string)($download['slug'] ?? ''),
            'teaser'           => (string)($download['teaser'] ?? ''),
            'description'      => (string)($download['description'] ?? ''),
            'keywords'         => (string)($download['keywords'] ?? ''),
            'icon'             => (string)($download['icon'] ?? ''),
            'filepath'         => (string)($download['filepath'] ?? ''),
            'fileprefix'       => (string)($download['fileprefix'] ?? ''),
            'private_download' => (bool)($download['private_download'] ?? false),
            'hideonapp'        => (bool)($download['hideonapp'] ?? false),
            'hideonwebsite'    => (bool)($download['hideonwebsite'] ?? false),
            'hideondatasheets' => (bool)($download['hideondatasheets'] ?? false),
            'hideonproducts'   => (bool)($download['hideonproducts'] ?? false),
            'file'             => $this->getDownloadFile($uid),
        ];
    }

    /**
     * Resolve the FAL file reference (fieldname=file) for a download.
     *
     * @return array<string,mixed>|null
     */
    protected function getDownloadFile(int $downloadUid): ?array
    {
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('sys_file_reference');

        $row = $qb
            ->select('fr.uid', 'fr.title', 'fr.description', 'f.uid AS file_uid', 'f.identifier', 'f.name', 'f.size', 'f.extension', 'f.mime_type')
            ->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_download', ParameterType::STRING)),
                $qb->expr()->eq('fr.fieldname', $qb->createNamedParameter('file', ParameterType::STRING)),
                $qb->expr()->eq('fr.uid_foreign', $qb->createNamedParameter($downloadUid, ParameterType::INTEGER)),
                $qb->expr()->eq('fr.deleted', 0),
                $qb->expr()->eq('f.missing', 0)
            )
            ->orderBy('fr.sorting_foreign', 'ASC')
            ->setMaxResults(1)
            ->executeQuery()
            ->fetchAssociative();

        if (!$row) {
            return null;
        }

        return [
            'uid'       => (int)$row['file_uid'],
            'name'      => (string)($row['name'] ?? ''),
            'url'       => '/fileadmin' . ($row['identifier'] ?? ''),
            'size'      => (int)($row['size'] ?? 0),
            'extension' => (string)($row['extension'] ?? ''),
            'mimeType'  => (string)($row['mime_type'] ?? ''),
            'title'     => (string)($row['title'] ?? ''),
            'description' => (string)($row['description'] ?? ''),
        ];
    }
}