package at.technikumwien.movies;

import javax.annotation.Resource;
import javax.ejb.*;
import javax.persistence.EntityManager;
import javax.persistence.EntityNotFoundException;
import javax.persistence.PersistenceContext;
import java.util.List;
import java.util.logging.Logger;

@Stateless
@TransactionManagement(value=TransactionManagementType.CONTAINER)
public class MoviesService {
    private static final Logger LOGGER = Logger.getLogger(MoviesService.class.getName());

    @Resource
    private SessionContext context;

    @PersistenceContext(unitName = "MoviesPU")
    private EntityManager em;

    public Movies findById(long id) {
        LOGGER.info("findById() >> id=" + id);

        Movies movies = em.find(Movies.class, id);
        if (movies == null) {
            throw new EntityNotFoundException("can't find movie with id=" + id);
        }

        return movies;
    }

    public List<Movies> findByTitle(String title) {
        LOGGER.info("findByTitle() >> title=" + title);

        return em.createNamedQuery("Movies.selectByTitle", Movies.class)
                .setParameter("title", "%" + title + "%")
                .getResultList();
    }

    public List<Movies> findAll() {
        LOGGER.info("findAll()");

        return em.createNamedQuery("Movies.selectAll", Movies.class) //JPQL -> java persistence query language
                .getResultList();
    }

    public void removeById(long id) {
        LOGGER.info("removeById() >> id=" + id);

        Movies movies = findById(id);
        em.remove(movies); //managed news required
    }

    public List<Actors> findAllActors() {
        LOGGER.info("findAllActors)");

        return em.createNamedQuery("Actors.selectAllActors", Actors.class)
                .getResultList();
    }

    public List<Studios> findAllStudios() {
        LOGGER.info("findAllStudios)");

        return em.createNamedQuery("Studios.selectAllStudios", Studios.class)
                .getResultList();
    }

    // TODO maybe check if the movie already exists?
    @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
    public void save(List<Movies> movies) {

        for (Movies movie : movies) {

            // TODO maybe get just the id and improve checking in for loop?
            // Get all actors and studios from the database
            List<Actors> allActors = findAllActors();
            List<Studios> allStudios = findAllStudios();

            try {
                // Get studio for the movie from the database
                Studios movieStudio = movie.getStudio();

                // If the studio is missing in the database, roll back only
                for (Studios studio : allStudios) {
                    if (studio.getName().equals(movieStudio.getName()) & studio.getCountrycode().equals(movieStudio.getCountrycode())
                            & studio.getPostcode().equals(movieStudio.getPostcode())) {
                        // Set id
                        movieStudio.setId(studio.getId());
                    }
                }
                if (movieStudio.getId() == null) {
                    LOGGER.info("Rollback! Movie studio: " + movieStudio);
                    context.setRollbackOnly();
                    return;
                }

                // TODO use also birthday
                // Get actor for the movie from the database
                for (Actors movieActor : movie.getActors()) {
                    LOGGER.info("Get an actor " + movieActor);
                    List actorListResult = em.createNamedQuery("Actors.getIdByProperties", Actors.class)
                            .setParameter("firstname", movieActor.getFirstname())
                            .setParameter("lastname", movieActor.getLastname())
                            .setParameter("sex", movieActor.getSex())
                            //.setParameter("birthdate", movieActor.getBirthdate())
                            .getResultList();

                    // If any actor is missing in the database, roll back only
                    for (Actors actor : allActors) {
                        if (actor.getFirstname().equals(movieActor.getFirstname())
                                & actor.getLastname().equals(movieActor.getLastname())
                                & actor.getSex().equals(movieActor.getSex())) {
                            //    & actor.getBirthdate().equals(movieActor.getBirthdate())) {
                            // Set id
                            movieActor.setId(actor.getId());
                    }
                        if (movieActor.getId() == null) {
                            LOGGER.info("Rollback! Movie actor: " + movieActor);
                            context.setRollbackOnly();
                            return;
                        }
                    }
                }
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
        LOGGER.info("save() >> movies" + movies);
        for (Movies movie : movies) {
            em.merge(movie);
        }
    }
}