sfp_api_laravel_serprati/app/Http/Requests/NotificationRequest.php

<?php

namespace App\Http\Requests;

use App\Enums\NotificationRecipientEnum;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class NotificationRequest extends FormRequest
{
    public function rules(): array
    {
        $rules = [
            'title'                  => 'sometimes|string|max:255',
            'message'                => 'sometimes|string',
            'recipient'              => ['sometimes', Rule::enum(NotificationRecipientEnum::class)],
            'recipient_position_id'  => 'sometimes|nullable|integer|exists:positions,id',
            'recipient_sector_id'    => 'sometimes|nullable|integer|exists:sectors,id',
            'image'                  => 'sometimes|nullable|file|mimes:jpg,jpeg,png,webp|max:5120',
        ];

        if ($this->isMethod('post')) {
            $rules['title']     = 'required|string|max:255';
            $rules['message']   = 'required|string';
            $rules['recipient'] = ['required', Rule::enum(NotificationRecipientEnum::class)];
        }

        return $rules;
    }
}