package de.intevation.artifactdatabase.rest;

import org.w3c.dom.Document;

import org.restlet.ext.xml.DomRepresentation;

import org.restlet.resource.Post;  
import org.restlet.resource.ServerResource;

import org.restlet.data.Request;
import org.restlet.data.Response;
import org.restlet.data.Status;

import org.restlet.data.MediaType;

import org.apache.log4j.Logger;

import de.intevation.artifactdatabase.XMLUtils;

import org.restlet.representation.Representation;
import org.restlet.representation.EmptyRepresentation;

import java.io.IOException;

import de.intevation.artifacts.ArtifactNamespaceContext;
import de.intevation.artifacts.ArtifactDatabase;
import de.intevation.artifacts.Artifact;

/**
 * @author Sascha L. Teichmann (sascha.teichmann@intevation)
 */
public class CreateResource
extends      ServerResource
{
    private static Logger logger = Logger.getLogger(CreateResource.class);

    public static final String PATH = "/create";

    public static final String XPATH_FACTORY = "/action/factory/@name";

    public static final String NO_FACTORY_MESSAGE = "No factory given";

    public static final String NO_ARTIFACT_CREATED = "No artifact created";

    @Post
    public Representation represent() {

        Request request = getRequest();

        Representation requestRepr = request.getEntity();

        Document inputDocument = null;
        try {
            DomRepresentation input = new DomRepresentation(requestRepr);
            inputDocument = input.getDocument();
        }
        catch (IOException ioe) {
            logger.error(ioe.getMessage());
            Response response = getResponse();
            response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, ioe);
            return new EmptyRepresentation();
        }

        String factory = XMLUtils.xpathString(
            inputDocument,
            XPATH_FACTORY,
            ArtifactNamespaceContext.INSTANCE);

        if (factory == null || factory.length() == 0) {
            Response response = getResponse();
            response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, NO_FACTORY_MESSAGE);
            return new EmptyRepresentation();
        }

        if (logger.isDebugEnabled()) {
            logger.debug("Create artifact with factory '" + factory + "'");
        }

        ArtifactDatabase db = (ArtifactDatabase)getContext()
            .getAttributes().get("database");

        Artifact artifact = db.createArtifactWithFactory(factory);

        if (artifact == null) {
            Response response = getResponse();
            response.setStatus(Status.CLIENT_ERROR_UNPROCESSABLE_ENTITY, NO_ARTIFACT_CREATED);
            return new EmptyRepresentation();
        }
        
        Document outputDocument = artifact.describe(
            db.getArtifactContext());

        return new DomRepresentation(
            MediaType.APPLICATION_XML, outputDocument);
    }
}
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