<?php

namespace App\Element\UseCases\GetElement;

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

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

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

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

        $parentElement = $element->getParentElement();
        if ($parentElement === null) {
            $siblingElements = [$element];
        } else {
            $siblingElements = $this->elementRepository
                ->findByParentElement($parentElement);
        }

        return new GetElementResult(
            element: $element,
            childElements: $this->elementRepository
                ->findByParentElement($element),
            siblingElements: $siblingElements,
        );
    }
}