// File: DefaultPanel.java
// Classes: DefaultPanel
// Author: Kedar Patankar

package edu.neu.ccs.demeter.tools.apstudio.graphedit;

import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Color;

import java.awt.event.ActionListener;
import java.awt.event.FocusListener;
import java.awt.event.ActionEvent;
import java.awt.event.FocusEvent;
import java.awt.event.TextEvent;
import java.awt.event.TextListener;

import edu.neu.ccs.demeter.tools.apstudio.ui.PropsGridLayout;

/* Purpose : This class shows package and import statements */

public class DefaultPanel extends Panel implements ActionListener,FocusListener
{
	private Editor _editor;
	private String _preamble,_package;
	private TextField _packageText;
	private TextArea _preambleText;
	private PropertyWindow _pw;

	public DefaultPanel(Editor editor, PropertyWindow parent)
	{
		_editor = editor;
		_pw = parent;
		setLayout( new PropsGridLayout(5,5));
		
		TextField packageLabel,preambleLabel;

		packageLabel = new TextField("Package");
		_packageText = new TextField();
		_packageText.addActionListener(this);
		_packageText.addFocusListener(this);

		preambleLabel = new TextField("Import Statements");
		_preambleText = new TextArea();
		_preambleText.addFocusListener(this);

		packageLabel.setEditable(false);
		preambleLabel.setEditable(false);
		add(packageLabel);
		add(_packageText);
		add(preambleLabel);
		add(_preambleText);
		setBackground(Color.lightGray);
	}

	public void setValues(Document d)
	{
		JavaCode j = d.get_preamble();
		if(j!=null)
		{
			_preamble = d.get_preamble().get_code().toString().trim();
			_preambleText.setText(_preamble);
		}
		else
		{
			_preamble = "";
			_preambleText.setText("");
		}

		Package p = d.get_pkg();
		if(p == null)
		{
			_package="";
			_packageText.setText("");
		}
		else
		{
			String ps = p.get_packagename().toString();
			_package = ps;
			_packageText.setText(ps);
		}
	}

	public void actionPerformed(ActionEvent event)
	{
		String _packageString = _packageText.getText().trim();
		if(_package.equals(_packageString)) return;

		if(!_packageString.equals(""))
		{
			Package p;
			try{p = Package.parse("package "+_packageString+" ;");}
			catch(RuntimeException re)
			{
				_pw.showMessage("Not a valid package name.");
				_packageText.select(0,_packageString.length());
				_packageText.requestFocus();
				return;
			}
			_editor.curDocument().set_pkg(p);
			_package = _packageString;
			_editor.curDocument().cdNeedsSaving(true);
		}
		else
		{
			_editor.curDocument().set_pkg(null);
			_package = null;
			_editor.curDocument().cdNeedsSaving(true);
		}
		_pw.setDefaultMessage();
		_package = _packageString;
	}

	public void focusGained(FocusEvent event){}
	
	public void focusLost(FocusEvent event)
	{
		Object source = event.getSource();
		if(source == _packageText)
			_packageText.setText(_package);
		else
		{
			String s = _preambleText.getText().trim();
			if(_preamble.equals(s))
				return;
			
			if(s.equals(""))
				_editor.curDocument().set_preamble(null);
			else
			{
				JavaCode j = JavaCode.parse("(@ "+s+" @)");
				_editor.curDocument().set_preamble(j);
			}
			_preamble = s;
			_editor.curDocument().cdNeedsSaving(true);
		}
	}
} /* end class DefaultPanel */