@Service
public class PostsServiceImpl implements PostsService {
    @Autowired
    private PostsRepository postsRepository;

    @Override
    public PostResponse getAllPosts(Integer pageNo , Integer pageSize, String sortBy , String sortDir){
        Sort sort = sortDir.equalsIgnoreCase(Sort.Direction.ASC.name())? Sort.by(sortBy).ascending():Sort.by(sortBy).descending();
        Pageable pg = PageRequest.of(pageNo , pageSize , sort);
        Page<Posts> posts = postsRepository.findAll(pg);
        List<Posts> postsList = posts.getContent();
        List<PostDto> data =    postsList.stream().map(this::mapToDTO).collect(Collectors.toList());
        PostResponse postResponse = new PostResponse();
        postResponse.setData(data);
        postResponse.setPageNo(posts.getNumber() + 1);
        postResponse.setPageSize(posts.getSize());
        postResponse.setTotalElement(posts.getTotalElements());
        postResponse.setLast(posts.isLast());
        postResponse.setTotalPages(posts.getTotalPages());
        return  postResponse;

    }
}