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

/*
 * A simple Text Editor.  It has two features: it can
 * load a file and it can save a file.
 */
public class TextEditor extends Controller implements ActionListener {

        private JButton saveButton, loadButton;
        private JTextArea text;

        public void begin() {
                JPanel p = new JPanel();
                saveButton = new JButton("Save File");
                loadButton = new JButton("Load File");
                p.add(saveButton);
                p.add(loadButton);

                text = new JTextArea();
                text.setFont(new Font("Times", Font.PLAIN, 24));
                getContentPane().add(new JScrollPane(text), BorderLayout.CENTER);
                getContentPane().add(p, BorderLayout.NORTH);

                saveButton.addActionListener(this);
                loadButton.addActionListener(this);

                validate();
                
                text.setText("Loading files may not work in Web Browser...");

        }

        // Listener for button clicks that loads the
        // specified web pages and puts it in the
        // browser component.
        public void actionPerformed(ActionEvent event) {
                if (event.getSource() == saveButton) {
                        saveFile();
                } else {
                        loadFile();
                }
        }

        private void saveFile() {

                JFileChooser chooser = new JFileChooser();
                if (chooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
                        File file = chooser.getSelectedFile();
                        try {

                                // write the entire text of the text area to
                                // to the file
                                PrintWriter out = new PrintWriter(new FileWriter(file));
                                
                                out.println(text.getText());
                                
                                out.close();

                        } catch (IOException e) {
                                JOptionPane.showMessageDialog(this, "Error: " + e);
                        }
                }
        }

        private void loadFile() {
                text.setText("");  // clear window

                JFileChooser chooser = new JFileChooser();
                if (chooser.showOpenDialog(this) == 
                      JFileChooser.APPROVE_OPTION) {
                        File file = chooser.getSelectedFile();
                        try {
                                // read in the file, appending each line
                                // to the text window
                                BufferedReader input = new BufferedReader(new FileReader(file));

                                String line = input.readLine();
                                while (line != null) {
                                        text.append(line + "\n");
                                        line = input.readLine();
                                }

                                input.close();
                                
                        } catch (IOException e) {
                                JOptionPane.showMessageDialog(this, "Error: " + e);
                        }
                }
        }
}