/*
 * Copyright (c) 2011 by Intevation GmbH, Germany <info@intevation.de>
 *
 * This file is part of MXD2map.
 *
 * This program is free software under the LGPL (>=v2.1)
 * Read the file LICENCE.txt coming with the software for details
 * or visit http://www.gnu.org/licenses/ if it does not exist.
 *
 * MXD2map has been developed on behalf of the
 * Bundesamt fuer Seeschifffahrt und Hydrographie (BSH) in Hamburg
 * by Intevation GmbH.
 *
 * Authors:
 * Raimund Renkert <raimund.renkert@intevation.de>
 * Bjoern Schilberg <bjoern.schilberg@intevation.de>
 * Stephan Holl <stephan.holl@intevation.de>
 */

package de.intevation.mxd.reader;

import java.io.IOException;

import org.apache.log4j.Logger;

import com.esri.arcgis.carto.ILayer;
import com.esri.arcgis.carto.IFeatureRenderer;
import com.esri.arcgis.carto.WMSMapLayer;
import com.esri.arcgis.carto.WMSGroupLayer;
import com.esri.arcgis.carto.WMSLayer;
import com.esri.arcgis.gisclient.IWMSServiceDescription;
import com.esri.arcgis.gisclient.IWMSLayerDescription;
import com.esri.arcgis.geometry.Envelope;

import org.w3c.dom.Element;

import de.intevation.mxd.utils.MapToXMLUtils;


/**
 * Reads Layer information.
 *
 * @author <a href="mailto:aheinecke@intevation.de">Andre Heinecke</a>
 */
public class WMSLayerReader {

    /**
     * The logger.
     */
    private static final Logger logger =
        Logger.getLogger(FeatureLayerReader.class);

    /**
     * Privte member.
     */
    private WMSLayer  layer;
    private MapToXMLUtils util;
    private int invalidLayerCount;

    /**
     * Constructor with layer.
     *
     * @param layer The ArcGIS layer object.
     */
    public WMSLayerReader(ILayer layer)
    throws Exception {
        if(layer instanceof WMSLayer) {
            this.layer = (WMSLayer)layer;
            invalidLayerCount = 0;
        }
        else {
            throw new Exception("Not an instance of WMSLayer: " +
                layer.getClass().toString());
        }
    }

    /**
     * Setter for XML document helper.
     *
     * @param util The helper for storing map information.
     */
    public void setUtil(MapToXMLUtils util) {
        this.util = util;
    }

    /**
     * Reads the Layer content.
     *
     * @return The layer XML element.
     */
    public Element read()
    throws IOException{
        logger.debug("read()");
        Element layerElement = null;
        try {
            layerElement = util.addLayer();
        }
        catch(Exception e) {
            logger.error("Failed to create DOM-Element for Layer.");
            return null;
        }
        try {
            layerElement.setAttribute("name", layer.getName());
        }
        catch(IOException ioe) {
            logger.warn(
                "Could not read layer name." +
                " Stopped reading layer.");
            throw new IOException("Error reading layer name.");
        }

        try {
            layerElement.setAttribute("min_scale",
                String.valueOf(layer.getMinimumScale()));
        }
        catch(IOException ioe) {
            logger.debug("Could not read minimum scale.");
            layerElement.setAttribute("min_scale", "0");
        }

        try {
            layerElement.setAttribute("max_scale",
                String.valueOf(layer.getMaximumScale()));
        }
        catch(IOException ioe) {
            logger.debug(
                "Could not read maximum scale.");
            layerElement.setAttribute("max_scale", "0");
        }

        try {
            if(layer.isVisible()) {
                layerElement.setAttribute("status", "on");
            }
            else {
                layerElement.setAttribute("status", "off");
            }
        }
        catch(IOException ioe) {
            logger.warn(
                "Could not read layer status." +
                " Setting layer status to \"on\".");
            layerElement.setAttribute("status", "on");
        }

        layerElement.setAttribute("connection_type", "WMS");

        try{
            // Set the WMS Connection parameters
            IWMSServiceDescription wmsconn = layer.getWMSServiceDescription();

            String connectionURL = wmsconn.getBaseURL("GetMap", "Get");
            if (!connectionURL.endsWith("?")) {
                connectionURL += "?";
            }
            layerElement.setAttribute("connection", connectionURL);
            logger.debug(connectionURL);
            layerElement.setAttribute("imageType",  wmsconn.getImageFormat(0));
            logger.debug(wmsconn.getImageFormat(0));
            if (wmsconn.getSRSCount() > 0) {
                layerElement.setAttribute("projection", wmsconn.getSRS(0));
                logger.debug(wmsconn.getSRS(0));
            }
            String wms_version = wmsconn.getWMSVersion();
            if (wms_version != "1.0.0" && wms_version != "1.0.7" &&
                wms_version != "1.1.0" && wms_version != "1.1.1") {
                logger.warn("WMS Version " + wms_version + " not supported by" +
                        "Mapserver. Falling back to Version 1.1.1");
                wms_version = "1.1.1";
            }
            layerElement.setAttribute("wms_server_version", wms_version);
        }
        catch(Exception e) {
            logger.debug(e);
            logger.error("Error Setting Connection parameters. " + layer.getName());
        }

        try{
            // Set the WMS Layer parameters
            IWMSLayerDescription wmslayer = layer.getWMSLayerDescription();
            layerElement.setAttribute("wms_name", wmslayer.getName());
        }
        catch(Exception e) {
            logger.debug(e);
            logger.error("Error Setting Layer parameters. " + layer.getName());
        }
        return layerElement;
    }
}
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