package de.intevation.flys.client.server;

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

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

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.client.services.FixingsOverviewService;

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

import java.io.IOException;
import java.io.InputStream;

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

public class FixingsOverviewServiceImpl
extends      RemoteServiceServlet
implements   FixingsOverviewService
{
    private static final Logger log =
        Logger.getLogger(FixingsOverviewServiceImpl.class);

    public static final String SERVICE_NAME = "fixings-overview";

    public static final String XSL_TRANSFORM =
        "/WEB-INF/stylesheets/fixoverview2html.xsl";

    @Override
    public String generateOverview(
        String locale,
        String  uuid,
        boolean checkboxes,
        String  filter
    ) 
    throws ServerException
    {
        log.info("FixingsOverviewServiceImpl.doGet");

        if (filter == null || filter.length() == 0) {
            log.warn("Missing 'filter' parameter.");
            return "";
        }

        Document filterDoc = XMLUtils.jsonToXML(filter);

        if (filterDoc == null) {
            log.warn("Creating filter document failed.");
            return "";
        }

        InputStream transform =
            getServletContext().getResourceAsStream(XSL_TRANSFORM);

        try {
            String url = getServletContext().getInitParameter("server-url");
            HttpClient client = new HttpClientImpl(url, locale);
            Document resultDoc =
                client.callService(url, SERVICE_NAME, filterDoc);
            XSLTransformer xformer = new XSLTransformer();
            xformer.addParameter("project-uuid", uuid);
            xformer.addParameter(
                "render-checkboxes", checkboxes ? "true()" : "false()");
            String result = xformer.transform(resultDoc, transform);
            return result != null ? result : "";
        }
        catch (ConnectionException ce) {
            log.error(ce);
        }
        finally {
            try { transform.close(); }
            catch (IOException ioe) {}
        }

        return "";
    }
}
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