package net.sourceforge.phpeclipse.xdebug.php.model;


import net.sourceforge.phpeclipse.xdebug.core.Base64;
import net.sourceforge.phpeclipse.xdebug.core.xdebug.XDebugConnection;
import net.sourceforge.phpeclipse.xdebug.core.xdebug.ResponseListener.DebugResponse;
import net.sourceforge.phpeclipse.xdebug.php.model.XDebugVariable;
import net.sourceforge.phpeclipse.xdebug.php.model.XDebugTarget;
import org.eclipse.debug.core.model.IDebugElement;
import org.eclipse.debug.core.model.IWatchExpressionDelegate;
import org.eclipse.debug.core.model.IWatchExpressionListener;
import org.eclipse.debug.core.model.IWatchExpressionResult;
import org.w3c.dom.Node;

public class XDebugWatchExpressionDelegate implements IWatchExpressionDelegate {
	public void evaluateExpression(String expression, IDebugElement context, IWatchExpressionListener listener) {
		IWatchExpressionResult x;
		XDebugConnection connection;
		XDebugTarget s;

		x = new XDebugWatchExpressionResult(expression, null, null);
		
		s = (XDebugTarget) context.getDebugTarget();
		connection = (XDebugConnection) s.getDebugConnection();

		if( connection != null ) {
			try {
				if( ! connection.isClosed() ) {
					String encoded = Base64.encodeBytes(expression.getBytes());
					DebugResponse evalCommand = connection.sendRequestA( "eval", "-- "+encoded );
					
					Node evalNode = evalCommand.getParentNode();
					XDebugVariable var= connection.getVariableFromNodeA( null, evalNode.getFirstChild());
					XDebugVariable result[] = {var};
					
					if (result.length == 0) {
						x = new XDebugWatchExpressionResult(expression, null, null);
					} else {
						x = new XDebugWatchExpressionResult(expression, result[0].getValue(), null);
					}
				}
			} catch (Exception e) {
				String[] s1;
	
				s1 = new String[1];
				s1[0] = e.toString();
				x = new XDebugWatchExpressionResult(expression, null, s1);
			}
		}

		listener.watchEvaluationFinished(x);
	}
}