<?php

namespace App\Element\UseCases\UpdateElement;

use App\Element\Element;
use App\Element\ElementRepository;
use App\Exceptions\BadRequestException;
use App\Exceptions\NotFoundException;
use App\Shared\Files\FileUploader;

class UpdateLongPdfPath
{
    public function __construct(
        private ElementRepository $elementRepository,
        private FileUploader $fileUploader,
    ) {
    }

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

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

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

        $longPdfPath = $this->nullableString($request->longPdfPath);
        if ($longPdfPath === null) {
            $this->deleteManagedFile($element->getLongPdfPath());
        }

        $element->setLongPdfPath($longPdfPath);

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

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

        return $value;
    }

    private function deleteManagedFile(?string $path): void
    {
        if ($path === null) {
            return;
        }

        $this->fileUploader->delete($path);
    }
}