package de.intevation.mxd.reader;

import org.apache.log4j.Logger;

import com.esri.arcgis.carto.ILayer;
import com.esri.arcgis.carto.GdbRasterCatalogLayer;

import org.w3c.dom.Element;
import java.io.IOException;
import de.intevation.mxd.utils.MapToXMLUtils;

/**
 * Reads Layer information.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class GdbRasterCatalogLayerReader
implements ILayerReader {

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

    /**
     * Privte member.
     */
    private GdbRasterCatalogLayer  layer;
    private MapToXMLUtils util;


    public GdbRasterCatalogLayerReader(ILayer layer)
    throws Exception {
        if(layer instanceof GdbRasterCatalogLayer) {
            this.layer = (GdbRasterCatalogLayer)layer;
        }
        else {
            throw new Exception("Not an instance of GdbRastaCatalogLayer: " +
                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;
        try {
            layerElement = util.addLayer();
        }
        catch(Exception e) {
            logger.error(
                "Could not create DOM element for layer." +
                "Stopped reading layer.");
            throw new IOException(
                this.getClass()+toString() +
                "Error creating dom element");
        }

        try {
            layerElement.setAttribute("name", layer.getName());
        }
        catch(IOException ioe) {
            logger.warn(
                "Could not read layer name. " +
                "Setting layer name to \"default\".");
            layerElement.setAttribute("name", "default");
        }

        try {
            layerElement.setAttribute("min_scale",
                String.valueOf(layer.getMinimumScale()));
        }
        catch(IOException ioe) {
            logger.warn(
                "Could not read minimum layer scale." +
                "Setting minimum layer scale to 1000");
            layerElement.setAttribute("min_scale", "1000");
        }

        try {
            layerElement.setAttribute("max_scale",
                String.valueOf(layer.getMaximumScale()));
        }
        catch(IOException ioe) {
            logger.warn(
                "Could not read maximum layer scale." +
                "Setting maximum layer scale to 1000000");
            layerElement.setAttribute("max_scale", "1000000");
        }

        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");
        }

        try {
            layerElement.setAttribute("definition_query",
                layer.getDefinitionExpression());
        }
        catch(IOException ioe) {
            logger.warn(
                "Could not read layer definition query." +
                "Setting empty definition query.");
            layerElement.setAttribute("definition_query", "");
        }
        return layerElement;
    }
}
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