package de.intevation.mxd.reader;

import java.io.IOException;

import org.apache.log4j.Logger;

import com.esri.arcgis.carto.IFeatureRenderer;
import com.esri.arcgis.carto.ClassBreaksRenderer;
import com.esri.arcgis.display.ISymbol;
import com.esri.arcgis.display.SimpleMarkerSymbol;
import com.esri.arcgis.display.SimpleFillSymbol;

import org.w3c.dom.Element;

import de.intevation.mxd.utils.MapToXMLUtils;

/**
 * Reads the ClassBreaksRender Object Attributes.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class ClassBreakRendererReader
implements IRendererReader {

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

    /**
     * Private member.
     */
    private ClassBreaksRenderer renderer;
    private Element layer;
    private MapToXMLUtils util;


    public ClassBreakRendererReader(IFeatureRenderer renderer)
    throws Exception {
        logger.debug("contructor()");
        if(renderer instanceof ClassBreaksRenderer)
            this.renderer = (ClassBreaksRenderer)renderer;
        else
            throw new Exception("Not a ClassBreaksRenderer!");
    }

    /**
     * Setter for the parent XML element.
     *
     * @param parent The XML parent node.
     */
    public void setParent(Element parent) {
        this.layer = parent;
    }

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

    /**
     * Reads the Renderer attributes.
     *
     * @return The XML node.
     */
    public Element read()
    throws IOException {
        logger.debug("read()");

        for(int i = 0; i < renderer.getBreakCount(); i++){
            Element rendererElement;
            try {
                rendererElement = util.addRenderer(layer);
                rendererElement.setAttribute("value",
                    String.valueOf(renderer.getBreak(i)));
                rendererElement.setAttribute(
                    "field_count",
                    String.valueOf(renderer.getFieldCount()));
                for(int j = 0; j < renderer.getFieldCount(); j++) {
                    rendererElement.setAttribute(
                        "expression_field_" + j,
                        renderer.getField(j));

                }
                rendererElement.setAttribute(
                    "min_value",
                    String.valueOf(renderer.getMinimumBreak()));
                rendererElement.setAttribute("expression_operator", "<=");
                ISymbol sym = renderer.getSymbol(i);
                ISymbolReader symReader;
                if(sym instanceof SimpleFillSymbol) {
                    symReader = new SimpleFillSymbolReader(renderer.getSymbol(i));
                    symReader.setUtil(util);
                    symReader.setParent(rendererElement);
                    symReader.read();
                }
                else if(sym instanceof SimpleMarkerSymbol) {
                    symReader = new SimpleMarkerSymbolReader(renderer.getSymbol(i));
                    symReader.setUtil(util);
                    symReader.setParent(rendererElement);
                    symReader.read();
                }
                else {
                    logger.debug("Not a known symbol type: " +
                                 sym.getClass().toString());
                }
            }
            catch(Exception e) {
                e.printStackTrace();
                return null;
            }
        }
        return layer;
    }
}
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