import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

/**
 * This class represents a GUI for a fairly crappy text editor.
 * @author Marty Stepp
 * @version CSE 331 Spring 2011, 4/29/2011
 */
public class TextEditorGUI {
	private JButton saveButton;
	private JButton button2;
	private JButton southwest;
	private JButton southeast;
	private JFrame frame;
	private JTextArea textarea;
	
	// Constructs the GUI and displays it on the screen.
	public TextEditorGUI() {
		// create some components (buttons)
		saveButton = new JButton("Save As...");
		button2 = new JButton("Button 2");
		southwest = new JButton("Southwest");
		southeast = new JButton("Southeast");
		textarea = new JTextArea();
		
		frame = new JFrame("331 is great");
		frame.setLocation(300, 100);
		frame.setSize(400, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		// attach event listener to respond to clicks
		saveButton.addActionListener(new SaveListener());
		
		// use panels for Composite layout
		Container topPanel = new JPanel(new FlowLayout());
		topPanel.add(saveButton);
		topPanel.add(button2);
		
		Container bottomPanel = new JPanel(new BorderLayout());
		bottomPanel.add(southwest, BorderLayout.WEST);
		bottomPanel.add(southeast, BorderLayout.EAST);
		
		// put buttons in the overall window container (the frame)
		frame.setLayout(new BorderLayout());
		frame.add(topPanel, BorderLayout.NORTH);
		frame.add(bottomPanel, BorderLayout.SOUTH);
		
		// JScrollPane serves as a Decorator around the text area to add scrollbars
		frame.add(new JScrollPane(textarea), BorderLayout.CENTER);
		
		// show the frame on the screen
		frame.setVisible(true);
	}
	
	// This listener responds to clicks on the "Save As..." button.
	// It saves the text in the main text area to a given file.
	private class SaveListener implements ActionListener {
		public void actionPerformed(ActionEvent event) {
			String text = textarea.getText();
			
			// show a file chooser dialog box to pick the file name to save as
			JFileChooser chooser = new JFileChooser();
			chooser.showSaveDialog(frame);
			File selected = chooser.getSelectedFile();
			
			try {
				// save the file
				PrintStream out = new PrintStream(selected);
				out.print(text);
				out.close();
			} catch (FileNotFoundException e) {
				// display an error message
				JOptionPane.showMessageDialog(frame, e.getMessage());
			}
		}
	}
}