package de.intevation.mxd.reader;

import org.apache.log4j.Logger;

import com.esri.arcgis.carto.ILayer;
import com.esri.arcgis.carto.FeatureLayer;
import com.esri.arcgis.carto.AnnotateLayerPropertiesCollection;
import com.esri.arcgis.carto.IAnnotateLayerProperties;
import com.esri.arcgis.carto.LabelEngineLayerProperties;
import com.esri.arcgis.geodatabase.FeatureClassName;
import com.esri.arcgis.system.IName;
import com.esri.arcgis.system.IPropertySet;
import com.esri.arcgis.display.ITextSymbol;
import com.esri.arcgis.display.TextSymbol;

import org.w3c.dom.Element;

import de.intevation.mxd.utils.MapToXMLUtils;
import java.io.IOException;
import com.esri.arcgis.interop.AutomationException;
/**
 * Reads Label information.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class LabelEngineReader {

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

    /**
     * Privte member.
     */
    private LabelEngineLayerProperties properties;
    private MapToXMLUtils util;
    private Element parent;

    public LabelEngineReader(IAnnotateLayerProperties prop)
    throws Exception {
        if(prop instanceof LabelEngineLayerProperties) {
            this.properties = (LabelEngineLayerProperties)prop;
        }
        else {
            throw new Exception("Not an instance of LaberEngineLayerProperties: " +
                prop.getClass().toString());
        }
    }

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

    public void setParent(Element parent) {
	this.parent = parent;     
    }



    /**
     * Reads the Label content.
     *
     * @return The label XML element.
     */
    public Element read()
    throws IOException{
        logger.debug("read()");
	Element labelElement;
        try {
            labelElement = util.addLabel(parent);
        }
        catch(Exception e) {
            logger.error("Failed to create DOM-Element for Label.");
            return null;
        }

	try {
	    labelElement.setAttribute("expression", properties.getExpression());
	}
	catch(IOException ioe) {
	    logger.warn("Could not read label expression.");
	    return null;
	}

        try {
	    labelElement.setAttribute(
                "offset",
	       	String.valueOf(properties.getOffset()));
	}
	catch(IOException ioe) {
	    logger.warn("Could not read label offset.");
	}

	try {
	    labelElement.setAttribute(
                "definition_query",
	       	properties.getWhereClause());
	}
	catch(IOException ioe) {
	    logger.warn("Could not read label where clause.");
	}

        try {
	    labelElement.setAttribute(
		"max_scale",
		String.valueOf(properties.getAnnotationMaximumScale()));
	    labelElement.setAttribute(
		"min_scale",
		String.valueOf(properties.getAnnotationMinimumScale()));
	}
	catch(IOException ioe) {
	    logger.warn("Could not read label scale.");
	}

	try {
            ITextSymbol sym = properties.getSymbol();
	    if(sym instanceof TextSymbol) {
	        TextSymbolReader tsr = new TextSymbolReader(sym);
		tsr.setParent(labelElement);
		tsr.setUtil(util);
		tsr.read();
	    }
	}
        catch(Exception e) {
	    logger.warn("Could not read label text symbol.");
	}
	
	return labelElement;
    }
}
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