<?php

namespace App\Element\UseCases\UpdateElement;

use App\Element\Element;
use App\Element\ElementRepository;
use App\Exceptions\BadRequestException;
use App\Exceptions\NotFoundException;

class UpdatePdfPath
{
    public function __construct(private ElementRepository $elementRepository)
    {
    }

    /**
     * @throws BadRequestException
     * @throws NotFoundException
     */
    public function execute(UpdatePdfPathRequest $request): Element
    {
        if ($request->id === null) {
            throw new BadRequestException('id is required');
        }

        if ($request->pdfPath === null) {
            throw new BadRequestException('pdfPath is required');
        }

        $element = $this->elementRepository->find($request->id);
        if ($element === null) {
            throw new NotFoundException('Element not found');
        }

        $element->setPdfPath($this->nullableString($request->pdfPath));

        return $this->elementRepository->update($element);
    }

    private function nullableString(string $value): ?string
    {
        if ($value === '') {
            return null;
        }

        return $value;
    }
}