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package com.hack23.cia.service.user.impl;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.hack23.cia.model.user.api.User;
import com.hack23.cia.service.user.api.NoSuchUser;
import com.hack23.cia.service.user.api.NoSuchUserException;
import com.hack23.cia.service.user.api.UserService;

@Transactional
@Service(value = "UserService")
public class UserServiceImpl implements UserService {

	/** The entity manager. */
	@PersistenceContext(name = "com.hack23.cia.model.user.api")
	private EntityManager entityManager;

	@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
	public void deleteUserById(final Integer userId) throws NoSuchUserException {
		final User user = this.entityManager.find(User.class, userId);
		this.entityManager.remove(user);
	}

	@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
	public User getUserById(final Integer userId) throws NoSuchUserException {

		final User user = this.entityManager.find(User.class, userId);

		if (user == null) {
			NoSuchUser noSuchUser = new NoSuchUser();
			noSuchUser.setUserId(userId);
			throw new NoSuchUserException(
					"Did not find any matching user for id [" + userId + "].",
					noSuchUser);

		} else {
			return user;
		}
	}

	@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
	public Integer updateUser(User user) {
		final User mergedUser = this.entityManager.merge(user);
		return mergedUser.getModelObjectId();
	}

}