<?php

declare(strict_types=1);

namespace App\Services\FormBuilder;

use App\Models\FormBuilder\FormSchema;
use App\Models\Organisation;
use App\Models\User;

/**
 * Resolves the effective locale for a form submission per ARCH §16.2.
 * Chain: submitter.locale → schema.locale → organisation.default_locale → 'nl'.
 */
final class FormLocaleResolver
{
    public function resolve(FormSchema $schema, ?User $submitter = null): string
    {
        if ($submitter !== null && ! empty($submitter->locale)) {
            return (string) $submitter->locale;
        }

        if (! empty($schema->locale)) {
            return (string) $schema->locale;
        }

        $organisation = $schema->organisation ?? Organisation::withoutGlobalScopes()->find($schema->organisation_id);
        if ($organisation !== null && ! empty($organisation->default_locale)) {
            return (string) $organisation->default_locale;
        }

        return 'nl';
    }
}