<?php

namespace App\Comment\UseCases\CreateComment;

use App\Auth\Clock;
use App\Comment\Comment;
use App\Comment\CommentRepository;
use App\Comment\CreateCommentDto;
use App\Exceptions\BadRequestException;
use App\Post\PostRepository;
use DomainException;

class CreateComment
{
    public function __construct(
        private CommentRepository $commentRepo,
        private PostRepository $postRepo,
        private Clock $clock,
    ) {}

    /**
     * @throws BadRequestException
     * @throws DomainException
     */
    public function execute(CreateCommentRequest $request): Comment
    {
        if ($request->postId <= 0) {
            throw new BadRequestException('postId must be positive');
        }
        if ($request->userId <= 0) {
            throw new BadRequestException('userId must be positive');
        }
        $body = $request->body === null ? '' : trim($request->body);
        if ($body === '') {
            throw new BadRequestException('body is required');
        }

        if ($this->postRepo->find($request->postId) === null) {
            throw new DomainException('post not found');
        }

        return $this->commentRepo->create(new CreateCommentDto(
            postId: $request->postId,
            userId: $request->userId,
            body: $body,
            createdAt: $this->clock->now(),
        ));
    }
}