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package de.terrestris.shoguncore.service;

import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Restrictions;
import org.joda.time.DateTime;
import org.springframework.transaction.annotation.Transactional;

import de.terrestris.shoguncore.dao.AbstractTokenDao;
import de.terrestris.shoguncore.model.token.Token;

/**
 * @author Daniel Koch
 * @author Nils Bühner
 */
public abstract class AbstractTokenService>
    extends PermissionAwareCrudService {

    /**
     * Default constructor, which calls the type-constructor
     */
    @SuppressWarnings("unchecked")
    public AbstractTokenService() {
        this((Class) Token.class);
    }

    /**
     * Constructor that sets the concrete entity class for the service.
     * Subclasses MUST call this constructor.
     */
    protected AbstractTokenService(Class entityClass) {
        super(entityClass);
    }

    /**
     * @return
     */
    @Transactional(readOnly = true)
    public E findByTokenValue(String token) {

        Criterion criteria = Restrictions.eq("token", token);

        E userToken = dao.findByUniqueCriteria(criteria);

        return userToken;
    }

    /**
     * If the passed token is null or expired, this method will throw an
     * {@link Exception}.
     *
     * @param token
     * @throws Exception if the token is not valid (e.g. because it is expired)
     */
    @Transactional(readOnly = true)
    public void validateToken(E token) throws Exception {

        if (token == null) {
            throw new Exception("The provided token is null.");
        }

        DateTime expirationDate = (DateTime) token.getExpirationDate();

        String tokenValue = token.getToken();

        // check if the token expire date is valid
        if (expirationDate.isBeforeNow()) {
            throw new Exception("The token '" + tokenValue + "' expired on '"
                + expirationDate + "'");
        }

    }

}