package de.intevation.flys.client.server;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

import de.intevation.artifacts.common.ArtifactNamespaceContext;

import de.intevation.artifacts.common.utils.XMLUtils;

import de.intevation.flys.client.shared.exceptions.ServerException;

import de.intevation.flys.client.client.services.MetaDataService;

import de.intevation.artifacts.httpclient.exceptions.ConnectionException;

import de.intevation.artifacts.httpclient.http.HttpClient;
import de.intevation.artifacts.httpclient.http.HttpClientImpl;

import de.intevation.flys.client.shared.model.DataCageTree;

import de.intevation.flys.client.server.meta.Converter;

public class MetaDataServiceImpl
extends      RemoteServiceServlet
implements   MetaDataService
{
    public static final String ERROR_NO_META_DATA_FOUND =
        "error_no_meta_data_found";

    public DataCageTree getMetaData(String url, String locale, String river) 
    throws ServerException
    {
        System.out.println("MetaDataService.getDistanceInfo");

        Document doc = XMLUtils.newDocument();

        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
            doc,
            ArtifactNamespaceContext.NAMESPACE_URI,
            ArtifactNamespaceContext.NAMESPACE_PREFIX);

        Element riverEl = ec.create("river");

        riverEl.setTextContent(river);

        doc.appendChild(riverEl);

        HttpClient client = new HttpClientImpl(url, locale);

        try {
            Converter converter = new Converter();
            return converter.convert(client.callService(url, "metadata", doc));
        }
        catch (ConnectionException ce) {
            System.err.println(ce.getLocalizedMessage());
        }

        throw new ServerException(ERROR_NO_META_DATA_FOUND);
    }
}
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