package de.intevation.lada.data;

import java.util.List;
import java.util.Map;

import javax.ejb.EJBTransactionRolledbackException;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.inject.Named;
import javax.persistence.EntityExistsException;
import javax.persistence.EntityManager;
import javax.persistence.TransactionRequiredException;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;

import de.intevation.lada.manage.Manager;
import de.intevation.lada.model.LOrt;
import de.intevation.lada.rest.Response;
import de.intevation.lada.validation.ValidationException;
import de.intevation.lada.validation.Validator;

@ApplicationScoped
@Named("lortrepository")
public class LOrtRepository implements Repository
{
    /**
     * The entitymanager managing the data.
     */
    @Inject
    private EntityManager em;

    @Inject
    @Named("lortvalidator")
    private Validator validator;

    @Inject
    @Named("datamanager")
    private Manager manager;

    @Override
    public EntityManager getEntityManager() {
        return this.em;
    }

    /**
     * Filter object list by the given criteria.
     *
     * @param criteria
     * @return List of objects.
     */
    public <T> Response filter(CriteriaQuery<T> filter) {
        List<T> result = em.createQuery(filter).getResultList();
        return new Response(true, 200, result);
    }

    /**
     * Get all objects of type <link>clazz</link>from database.
     *
     * @param clazz The class type.
     * @return List of objects.
     */
    public <T> Response findAll(Class<T> clazz) {
        CriteriaBuilder builder = em.getCriteriaBuilder();
        CriteriaQuery<T> criteria = builder.createQuery(clazz);
        Root<T> member = criteria.from(clazz);
        criteria.select(member);
        List<T> result = em.createQuery(criteria).getResultList();
        return new Response(true, 200, result);
    }

    /**
     * Find a single object identified by its id.
     *
     * @param clazz The class type.
     * @param id The object id.
     * @return The requested object of type clazz
     */
    public <T> Response findById(Class<T> clazz, String id) {
        T item = em.find(clazz, id);
        if (item == null) {
            return new Response(false, 600, null);
        }
        return new Response(true, 200, item);
    }

    /**
     * Validate and persist a new LProbe object.
     *
     * @param probe The new LProbe object
     * @return Response.
     */
    public Response create(Object object) {
        if (!(object instanceof LOrt)) {
            return new Response(false, 600, object);
        }
        LOrt ort = (LOrt)object;
        Response response = new Response(true, 200, ort);
        // Try to save the new LOrt.
        try {
            Map<String, Integer> warnings = validator.validate(ort);
            manager.create(ort);
            response.setWarnings(warnings);
            return response;
        }
        catch (EntityExistsException eee) {
            response.setSuccess(false);
            response.setMessage(601);
        }
        catch (IllegalArgumentException iae) {
            response.setSuccess(false);
            response.setMessage(602);
        }
        catch (TransactionRequiredException tre) {
            response.setSuccess(false);
            response.setMessage(603);
        }
        catch (ValidationException ve) {
            response.setSuccess(false);
            response.setMessage(604);
            response.setErrors(ve.getErrors());
            response.setWarnings(ve.getWarnings());
        }
        catch (EJBTransactionRolledbackException te) {
            response.setSuccess(false);
            response.setMessage(604);
        }
        return response;
    }

    public Response update(Object object) {
        if (!(object instanceof LOrt)) {
            return new Response(false, 600, object);
        }
        LOrt ort = (LOrt)object;
        Response response = new Response(true, 200, ort);
        // Try to update a LOrt object.
        try {
            Map<String, Integer> warnings = validator.validate(ort);
            manager.update(ort);
            response.setWarnings(warnings);
            return response;
        }
        catch (EntityExistsException eee) {
            response.setSuccess(false);
            response.setMessage(601);
        }
        catch (IllegalArgumentException iae) {
            response.setSuccess(false);
            response.setMessage(602);
        }
        catch (TransactionRequiredException tre) {
            response.setSuccess(false);
            response.setMessage(603);
        }
        catch (ValidationException ve) {
            response.setSuccess(false);
            response.setMessage(604);
            response.setErrors(ve.getErrors());
            response.setWarnings(ve.getWarnings());
        }
        catch (EJBTransactionRolledbackException te) {
            response.setSuccess(false);
            response.setMessage(604);
        }
        return response;
    }

    @Override
    public Response delete(Object object) {
        // TODO Auto-generated method stub
        return null;
    }
}