package de.intevation.flys.client.server;

import java.io.OutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.w3c.dom.Document;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

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


/**
 * This service is used to request a chart from the artifact server. The
 * response is directed directly to the output stream, so the image that is
 * retrieved is displayed in the UI afterwards.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ChartOutputServiceImpl
extends      HttpServlet
{
    public void doGet(HttpServletRequest req, HttpServletResponse resp) {
        System.out.println("ChartOutputServiceImpl.doGet");

        try {
            OutputStream out = resp.getOutputStream();

            String serverUrl = req.getParameter("server");
            String uuid      = req.getParameter("uuid");
            String type      = req.getParameter("type");
            String locale    = req.getParameter("locale");

            Document request = ClientProtocolUtils.newOutCollectionDocument(
                uuid, type, type,
                ChartServiceHelper.getChartAttributes(prepareChartAttributes(req)));

            HttpClient client = new HttpClientImpl(serverUrl, locale);
            client.collectionOut(request, uuid, "chart", out);

            out.close();
            out.flush();
        }
        catch (IOException ioe) {
            ioe.printStackTrace();
            System.err.println(ioe.getMessage());
        }
        catch (Exception e) {
            e.printStackTrace();
            System.err.println(e.getMessage());
        }
    }


    protected Map<String, String> prepareChartAttributes(HttpServletRequest req) {
        Map<String, String> attr = new HashMap<String, String>();

        Map params = req.getParameterMap();

        attr.put("width", req.getParameter("width"));
        attr.put("height", req.getParameter("height"));
        attr.put("minx", req.getParameter("minx"));
        attr.put("maxx", req.getParameter("maxx"));
        attr.put("miny", req.getParameter("miny"));
        attr.put("maxy", req.getParameter("maxy"));

        return attr;
    }
}
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