<?php

declare(strict_types=1);

namespace App\FormBuilder\Purposes\Resolvers;

use App\Exceptions\FormBuilder\PurposeSubjectResolutionException;
use App\FormBuilder\Purposes\PurposeSubjectResolver;
use App\Models\Company;
use App\Models\FormBuilder\FormSubmission;
use Illuminate\Database\Eloquent\Model;

/**
 * RFC §3 Q9 — supplier_intake: subject is the Company associated with
 * the production_request that created this submission. Throws if no
 * Company subject is set (route should validate upstream).
 */
final readonly class SupplierIntakeSubjectResolver implements PurposeSubjectResolver
{
    public function resolveOrProvision(FormSubmission $submission): Company
    {
        if ($submission->subject_type === 'company' && $submission->subject_id !== null) {
            $subject = $submission->subject;
            if ($subject instanceof Company) {
                return $subject;
            }
            throw new PurposeSubjectResolutionException(
                'supplier_intake',
                'subject_not_found',
                (string) $submission->id,
                "submission claims company subject {$submission->subject_id} but record is gone",
            );
        }

        throw new PurposeSubjectResolutionException(
            'supplier_intake',
            'no_production_request',
            (string) $submission->id,
            'supplier_intake submission has no Company subject — production_request link missing',
        );
    }
}