/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.gui.swing.process;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JComponent;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import org.geotools.data.Parameter;
import org.geotools.text.Text;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.io.WKTReader;
import com.vividsolutions.jts.io.WKTWriter;

/**
 *  Text field for filling in a Geometry parameter.
 */
public class JGeometryField extends AbstractParamWidget {
    private JTextArea text;
    
	public JGeometryField(Parameter<?> parameter) {
		super( parameter );
	}
	
	public JComponent doLayout() {
		text = new JTextArea( 40, 3 );
		text.addKeyListener( new KeyAdapter(){
            public void keyReleased( KeyEvent e ) {
                validate();
            }            
		});
		text.setWrapStyleWord( true );
		
	    JScrollPane scroll = new JScrollPane( text,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );
	    scroll.setPreferredSize( new Dimension(400,80 ));
	    return scroll;
	}
	
	public Object getValue() {
	    WKTReader reader = new WKTReader();
	    String wkt = text.getText();
	    if( wkt.length() == 0 ){
	        return null;
	    }
	   
	    try {
	        return reader.read( wkt );
	    }
	    catch (Throwable eek ){
	        return null;
	    }
	}

	/**
	 * Determine the number of dimensions based on the CRS metadata.
	 * 
	 * @return Number of dimensions expected based on metadata, default of 2
	 */
	int getD(){
		try {
		    CoordinateReferenceSystem crs = (CoordinateReferenceSystem) parameter.metadata.get( Parameter.CRS );
		    if( crs == null ){
		        return 2;
		    }
		    else {
		        return crs.getCoordinateSystem().getDimension();
		    }
		}
		finally {
			return 2;
		}
	}
	
	public void setValue(Object value) {
	    Geometry geom = (Geometry) value;
	    
	    WKTWriter writer = new WKTWriter( getD() );
	    String wkt = writer.write( geom );
	    
	    text.setText( wkt );
	}

	public boolean validate() {
        WKTReader reader = new WKTReader();
        String wkt = text.getText();
        if( wkt.length() == 0 ){
            return true;
        }
       
        try {
            Geometry geom = reader.read( wkt );
            if( parameter.type.isInstance( geom )){
                text.setToolTipText( null );
                text.setForeground( Color.BLACK );            
                return true;
            }
            else {
                text.setToolTipText( "Could not use "+geom.getClass()+" as "+parameter.type );
                text.setForeground( Color.RED );
                return false;
            }
        }
        catch (Throwable eek ){
            text.setToolTipText( eek.getLocalizedMessage() );
            text.setForeground( Color.RED );
            return false;
        }      
	}

}