//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.FeatureLayer;
import com.esri.arcgis.geometry.ISpatialReference;
import com.esri.arcgis.geometry.ProjectedCoordinateSystem;
import com.esri.arcgis.geometry.IProjection;
import com.esri.arcgis.geometry.Projection;
import com.esri.arcgis.display.ISymbol;
import com.esri.arcgis.display.SimpleMarkerSymbol;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

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

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

    private FeatureLayer  layer;
    private Document document;

    //Constructor
    public FeatureLayerReader(ILayer layer) throws Exception{
        if(layer instanceof FeatureLayer)
            this.layer = (FeatureLayer)layer;
        else
            throw new Exception("Not an instance of FeatureLayer: " +
                                layer.getClass().toString());
    }

    //Methods
    /**
     * Setter for XML document.
     */
    public void setDocument(Document doc){
        this.document = doc;
    }

    /**
     * Reads the Layer content.
     */
    public boolean read() throws IOException{
        logger.debug("read()");
        XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(document,
                                                                      "", "");

        Element layerElement = creator.create("layer");
        creator.addAttr(layerElement, "name", layer.getName());
        creator.addAttr(layerElement,
                        "min_scale",
                        String.valueOf(layer.getMinimumScale()));
        creator.addAttr(layerElement,
                        "max_scale",
                        String.valueOf(layer.getMaximumScale()));
        if(layer.isVisible())
            creator.addAttr(layerElement, "status", "on");
        else
            creator.addAttr(layerElement, "status", "off");
        creator.addAttr(layerElement,
                        "definition_query",
                        layer.getDefinitionExpression());
        NodeList list = document.getElementsByTagName("map");
        if(list.getLength() > 1){
            throw new IOException("Error while creating DOM! Found" +
                                  " more than one map object!");
        }
        else{
            Node map = list.item(0);
            map.appendChild(layerElement);
        }
        return true;
    }

    public void getLayer() throws IOException{
        logger.debug("getLayer() -> not implemented jet.");
        return;
    }
}
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