<?php
declare(strict_types=1);

class ContactPrefillColumns
{
    public const MAP = [
        ''                           => '— Keine Vorbefüllung —',
        'name'                       => 'Name',
        'email'                      => 'E-Mail',
        'vehicle_registration_place' => 'KFZ Nummernschild',
    ];

    public static function isValid(string $column): bool
    {
        return $column === '' || array_key_exists($column, self::MAP);
    }

    public static function sanitize(string $column): string
    {
        return self::isValid($column) ? $column : '';
    }

    public static function columns(): array
    {
        return array_keys(array_filter(self::MAP, static function (string $label, string $key): bool {
            return $key !== '';
        }, ARRAY_FILTER_USE_BOTH));
    }

    public static function resolve(array $contactRow, string $column): string
    {
        if ($column === '' || !self::isValid($column)) {
            return '';
        }

        return trim((string) ($contactRow[$column] ?? ''));
    }
}