package com.guams.review.service;

import com.guams.review.model.AuthorRepository;
import com.guams.review.model.PostRepository;
import com.guams.review.model.dao.Author;
import com.guams.review.model.dao.Post;
import com.guams.review.service.mapper.Mapper;
import com.guams.review.service.mapper.ReturnableAuthor;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Optional;
import java.util.UUID;

@Service
@RequiredArgsConstructor
public class AuthorService
{
    private final Mapper mapper;
    private final AuthorRepository authorRepository;
    private final PostRepository postRepository;

    public List<ReturnableAuthor> list() {
        return authorRepository.findAll().stream()
                .map(mapper::mapAuthor)
                .toList();
    }

    public List<Post> listPublicationOfAuthor(UUID authorId) {
        return postRepository.findPostsOfAuthor(authorId);
    }

    public Optional<Author> findById(UUID id) {
        return authorRepository.findById(id);
    }

    public ReturnableAuthor insert(Author author) {
        return mapper.mapAuthor(authorRepository.save(author));
    }

    @Transactional
    public void insertPublications(UUID authorId, List<Long> postIds) {
        for (Long postId : postIds) {
            authorRepository.deletePublication(authorId, postId);
            if (postRepository.findById(postId).isPresent()) {
                authorRepository.insertPublication(authorId, postId);
            }
        }
    }

    public void delete(Author author) {
        authorRepository.delete(author);
    }
}