package de.intevation.flys.client.server;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.OutputStream;

import javax.servlet.ServletException;

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

import org.apache.log4j.Logger;

import org.mapfish.print.MapPrinter;

import org.mapfish.print.output.OutputFactory;
import org.mapfish.print.output.OutputFormat;

import org.mapfish.print.utils.PJsonObject;

public class MapPrintServiceImpl
extends      HttpServlet
{
    private static final Logger log =
        Logger.getLogger(MapPrintServiceImpl.class);

    private static final String DEMO_JSON =
    "{" +
    "\"layout\": \"A4 portrait\"," +
    "\"title\": \"A simple example\"," +
    "\"srs\": \"EPSG:4326\"," +
    "\"dpi\": 254," +
    "\"units\": \"degrees\"," +
    "\"outputFormat\": \"pdf\"," +
    "\"layers\": [{" +
    "    \"type\": \"WMS\"," +
    "    \"layers\": [\"basic\"]," +
    "    \"baseURL\": \"http://labs.metacarta.com/wms/vmap0\"," +
    "    \"format\": \"image/jpeg\"" +
    "}," +
    "{" +
    "    \"type\": \"WMS\"," +
    "    \"layers\": [\"routes\"]," +
    "    \"baseURL\": \"http://www.camptocamp.org/cgi-bin/mapserv_c2corg\"," +
    "    \"format\": \"image/png\"" +
    "},    {" +
    "\"opacity\": 0.5," +
    "\"customParams\": {}," +
    "\"type\": \"Vector\"," +
    "\"styles\": {" +
    "    \"1\": {" +
    "        \"fillColor\": \"red\"," +
    "        \"strokeColor\": \"red\"," +
    "        \"fillOpacity\": 0.4000000000000001," +
    "        \"hoverFillColor\": \"white\"," +
    "        \"hoverFillOpacity\": 0.8000000000000002," +
    "        \"strokeOpacity\": 1," +
    "        \"strokeWidth\": 0.5," +
    "        \"strokeLinecap\": \"round\"," +
    "        \"strokeDashstyle\": \"solid\"," +
    "        \"hoverStrokeColor\": \"red\"," +
    "        \"hoverStrokeOpacity\": 1.0," +
    "        \"hoverStrokeWidth\": 0.2," +
    "        \"pointRadius\": 6," +
    "        \"hoverPointRadius\": 1," +
    "        \"hoverPointUnit\": \"%\"," +
    "        \"pointerEvents\": \"visiblePainted\"," +
    "        \"cursor\": \"inherit\"" +
    "    }" +
    "}," +
    "\"styleProperty\": \"_style\"," +
    "\"geoJson\": {" +
    "    \"type\": \"FeatureCollection\"," +
    "    \"features\": [{" +
    "        \"type\": \"Feature\"," +
    "        \"id\": \"OpenLayers.Feature.Vector_243\"," +
    "        \"properties\": {" +
    "            \"_style\": 1," +
    "            \"name\": \"\"," +
    "            \"description\": \"\"," +
    "            \"ext-comp-1048\": \"default\"" +
    "        }," +
    "        \"geometry\": {" +
    "            \"type\": \"Polygon\"," +
    "            \"coordinates\": [[[5, 45], [5, 47], [7, 47], [7, 45], [5, 45]]]" +
    "        }" +
    "    }]" +
    "}," +
    "\"name\": \"Cosmetic\"" +
    "    }" +
    "]," +
    "\"pages\": [" +
    "    {" +
    "        \"center\": [6, 45.5]," +
    "        \"scale\": 4000000," +
    "        \"mapTitle\": \"First map\"," +
    "        \"comment\": \"This is the first page selected by the user.\"," +
    "        \"rotation\": 0," +
    "        \"data\": {" +
    "            \"data\": [" +
    "                {\"id\":1, \"name\": \"blah\", \"icon\": \"icon_pan\", \"nameBackgroundColor\": \"red\", \"nameBorderColor\": \"blue\"}," +
    "                {\"id\":2, \"name\": \"blip\", \"icon\": \"icon_zoomin\", \"nameBackgroundColor\": \"yellow\", \"nameBorderColor\": \"green\"}" +
    "            ]," +
    "            \"columns\": [\"id\", \"name\", \"icon\"]" +
    "        }" +
    "    },{" +
    "        \"center\": [6, 45.5]," +
    "        \"scale\": 4000000," +
    "        \"mapTitle\": \"First map\"," +
    "        \"comment\": \"This is the first page selected by the user.\"," +
    "        \"rotation\": 0," +
    "        \"data\": {" +
    "            \"data\": [" +
    "                {\"id\":1, \"name\": \"blah\", \"icon\": \"icon_pan\", \"nameBackgroundColor\": \"red\", \"nameBorderColor\": \"blue\"}," +
    "                {\"id\":2, \"name\": \"blip\", \"icon\": \"icon_zoomin\", \"nameBackgroundColor\": \"yellow\", \"nameBorderColor\": \"green\"}" +
    "            ]," +
    "            \"columns\": [\"id\", \"name\", \"icon\"]" +
    "        }" +
    "    }" +
    "]" +
    "}";


    private MapPrinter getMapPrinter() throws ServletException, IOException {
        String configPath = getInitParameter("config");
        if (configPath == null) {
            throw new ServletException("Missing configuration in web.xml");
        }

        File configFile = new File(configPath);
        if (!configFile.isAbsolute()) {
            configFile = new File(getServletContext().getRealPath(configPath));
        }

        if (!configFile.isFile() || !configFile.canRead()) {
            throw new ServletException("Cannot read '" + configFile + "'");
        }

        return new MapPrinter(configFile);
    }

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) 
    throws  ServletException, IOException
    {
        log.info("MapPrintServiceImpl.doGet");

        PJsonObject jsonSpec = MapPrinter.parseSpec(DEMO_JSON);

        MapPrinter printer = getMapPrinter();

        OutputFormat outputFormat = OutputFactory.create(
            printer.getConfig(), jsonSpec);

        resp.setHeader("Content-Disposition", "attachment;filename=print.pdf");
        resp.setHeader("Content-Type", "application/pdf");

        // XXX: Streaming the generated PDF directly
        // to the request out does not work. :-/
        File tmpFile = File.createTempFile("map-printing", null);

        try {
            OutputStream out =
                new BufferedOutputStream(
                new FileOutputStream(tmpFile));
            try {
                outputFormat.print(printer, jsonSpec, out, "");
                out.flush();
            }
            catch (Exception e) {
                log.error(e);
                throw new ServletException(e);
            }
            finally {
                printer.stop();
                out.close();
            }
            InputStream in =
                new BufferedInputStream(
                new FileInputStream(tmpFile));
            out = resp.getOutputStream();
            try {
                byte [] buf = new byte[4096];
                int r;
                while ((r = in.read(buf)) >= 0) {
                    out.write(buf, 0, r);
                }
                out.flush();
            }
            finally {
                in.close();
                out.close();
            }
        }
        finally {
            if (tmpFile.exists()) {
                tmpFile.delete();
            }
        }
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :