<?php

namespace App\Element\UseCases\UpdateElement;

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

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

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

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

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

        return $this->elementRepository->update(
            $element,
            new UpdateElementDto(
                title: $request->title,
                description: $request->description ?? '',
                iconImageUrl: $this->nullableString($request->iconImageUrl),
                richText: $request->richText ?? '',
                pdfPath: $this->nullableString($request->pdfPath),
                youtubeUrl: $this->nullableString($request->youtubeUrl),
            ),
        );
    }

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

        return $value;
    }
}