package de.intevation.flys.client.server;

import java.util.List;

import java.io.Reader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;

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

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

import au.com.bytecode.opencsv.CSVReader;

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

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

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


/**
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class CSVExportServiceImpl
extends      RemoteServiceServlet
implements   CSVExportService
{
    public static final String ERROR_NO_EXPORT_FOUND =
        "error_no_export_found";

    public List getCSV(
        String url,
        String locale,
        String uuid,
        String name)
    throws ServerException
    {
        System.out.println("CSVExportServiceImpl.getCSV");

        Document requestDoc = XMLUtils.newDocument();

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

        Element action = ec.create("action");
        ec.addAttr(action, "type", "csv", true);
        ec.addAttr(action, "name", name, true);

        requestDoc.appendChild(action);

        HttpClient client = new HttpClientImpl(url, locale);
        try {
            InputStream in = client.collectionOut(requestDoc, uuid, "export");
            Reader reader       = new InputStreamReader (in, "UTF-8");
            CSVReader csvReader = new CSVReader (reader);

            return csvReader.readAll ();
        }
        catch (IOException ce) {
            System.err.println(ce.getLocalizedMessage());
        }

        throw new ServerException(ERROR_NO_EXPORT_FOUND);
    }
}
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