<?php

declare(strict_types=1);

namespace Evomedien\Vitec\Import;

use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * Registry of the domain models the CSV import module can write to.
 *
 * Adding a model = one entry in MODELS. The importable fields are derived
 * from the live TCA at runtime, so new columns show up in the mapper
 * automatically. Only scalar column types are offered - files, categories
 * and other relations cannot be carried by a flat CSV and are excluded.
 */
final class ImportModelRegistry
{
    private const MODELS = [
        'market' => ['table' => 'tx_vitec_domain_model_market', 'label' => 'Markets'],
        'solution' => ['table' => 'tx_vitec_domain_model_solution', 'label' => 'Solutions'],
        'product' => ['table' => 'tx_vitec_domain_model_product', 'label' => 'Products'],
    ];

    /** Scalar TCA column types a CSV cell can populate. */
    private const IMPORTABLE_TYPES = ['input', 'text', 'slug', 'number', 'email', 'link', 'check', 'color'];

    private const EXCLUDED_FIELDS = [
        'sys_language_uid', 'l10n_parent', 'l10n_diffsource', 'l10n_source',
        'l18n_parent', 'l18n_diffsource', 'starttime', 'endtime', 'hidden',
    ];

    /** @return array<string,array{key:string,table:string,label:string}> */
    public function all(): array
    {
        $out = [];
        foreach (self::MODELS as $key => $cfg) {
            $out[$key] = $cfg + ['key' => $key];
        }
        return $out;
    }

    public function has(string $key): bool
    {
        return isset(self::MODELS[$key]);
    }

    /** @return array{key:string,table:string,label:string} */
    public function get(string $key): array
    {
        return self::MODELS[$key] + ['key' => $key];
    }

    /**
     * Importable fields of a table, derived from TCA.
     *
     * @return array<string,string> fieldName => human label
     */
    public function importableFields(string $table): array
    {
        $fields = [];
        foreach ($GLOBALS['TCA'][$table]['columns'] ?? [] as $name => $column) {
            $type = (string)($column['config']['type'] ?? '');
            if (!in_array($type, self::IMPORTABLE_TYPES, true)) {
                continue;
            }
            if (in_array($name, self::EXCLUDED_FIELDS, true)) {
                continue;
            }
            if (($column['config']['renderType'] ?? '') === 'inputDateTime') {
                continue;
            }
            $label = (string)($column['label'] ?? $name);
            if (str_starts_with($label, 'LLL:')) {
                $translated = $GLOBALS['LANG'] ?? null ? (string)$GLOBALS['LANG']->sL($label) : '';
                $label = $translated !== '' ? $translated : $name;
            }
            $fields[$name] = $label !== '' ? $label : $name;
        }
        return $fields;
    }

    /** Pid of the first existing record - the sysfolder the model lives in. */
    public function detectPid(string $table): int
    {
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable($table);
        $row = $qb->select('pid')->from($table)
            ->where($qb->expr()->eq('deleted', 0))
            ->setMaxResults(1)
            ->executeQuery()->fetchAssociative();
        return $row ? (int)$row['pid'] : 0;
    }

    /**
     * All live records with the given fields, indexed by uid.
     *
     * @param array<int,string> $fields
     * @return array<int,array<string,mixed>>
     */
    public function loadRecords(string $table, array $fields): array
    {
        $select = array_values(array_unique(array_merge(['uid', 'title'], $fields)));
        $qb = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable($table);
        $rows = $qb->select(...$select)->from($table)
            ->where($qb->expr()->eq('deleted', 0))
            ->orderBy('title', 'ASC')
            ->executeQuery()->fetchAllAssociative();
        $out = [];
        foreach ($rows as $row) {
            $out[(int)$row['uid']] = $row;
        }
        return $out;
    }
}