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

/**
 *  Who are you?
 *  What section is this?
 *  When are you turning this in?
 *
 *  An encrypting text editor
 *  CS 170 Homework
 *
 */
public class JPad extends GUIApp
                  implements ActionListener
{
    // Constructor -------------------------------------
    public JPad(String fname)
    {
        // Construct superclass, initialize fields
        super("JPad - " + fname);
        this.fname = fname;
        
        // Set layout & size ----------------------
        setLayout(new BorderLayout(5, 5));
        Toolkit tk = Toolkit.getDefaultToolkit();
        int w = tk.getScreenSize().width / 2;
        int h = tk.getScreenSize().height / 2;
        setBounds(0, 0, w, h);
        
        // Initialize & place TextArea ---------------- 
        add(ta,   "Center");
        ta.setFont(new Font("Courier", Font.PLAIN, 12));
        
        // Initialize & place status bar, toolbar, menu bar
        status.setBackground(Color.lightGray);
        add(status, "South");
        
        add(toolBar(), "North");
        setMenuBar(menuBar());
    
        // Display initial file --------------------------
        readFile();
        show();
    }
    
    /**
     *  Creates ToolBar object
     */
    Panel toolBar()
    {
        Panel p = new Panel();
        p.setLayout(new FlowLayout(FlowLayout.LEFT));
        
        String[] btns = {"New", "Open", "Save", "Save As..."};
        for (int i = 0; i < btns.length; i++)
        {
            Button b = new Button(btns[i]);
            b.setActionCommand(btns[i]);
            b.addActionListener(this);
            p.add(b);
        }
        
        p.setBackground(Color.lightGray);
        
        return p;
    }
    
    /**
     *  Creates MenuBar
     */
    MenuBar menuBar()
    {
        MenuBar mb = new MenuBar();
        
        Menu fm = new Menu("File");
        fm.add("New");
        fm.add("Open");
        fm.add("Save");
        fm.add("Save As...");
        fm.add("-");
        fm.add("Exit");
        fm.addActionListener(this);
        mb.add(fm);
        
        return mb;
    }
    
    /**
     *  Menu, Button handler
     */
    public void actionPerformed(ActionEvent ae)
    {
        if (ae.getActionCommand().equals("New"))
            newFile();
        else if (ae.getActionCommand().equals("Open"))
            openFile();
        else if (ae.getActionCommand().equals("Save"))
            saveFile();
        else if (ae.getActionCommand().equals("Save As..."))
            saveFileAs();
        else if (ae.getActionCommand().equals("Exit"))
            quitApp();
    }
    
    
    /**
     *  Clears TextArea
     *  Sets fname to Untitled
     */
    private void newFile()
    {
        System.out.println("New File");
        /*
        1. Set fname to "Untitled"
        2. Clear ta
        3. Set focus to ta
        */
    }
    
    /**
     *  Uses FileDialog to get FileName
     *  Sets fname to directory + filename         
     *  Calls readFile()
     */
    private void openFile()
    {
        System.out.println("Open File");
        /*
        1. Open a FileDialog using *.jpad as the mask
        2. If use cancels then print a message and return
        3. Otherwise, set fname to directory+filename,
        4. Call readFile()
        */
    }
    
    /**
     *  Check if file is "Untitled"
     *  Yes? Calls SaveFileAs()
     *  No?  Calls writeFile()
     */
    private void saveFile()
    {
        System.out.println("Save File");
        /*
        1. If fname equals "Untitled" call saveFileAs()
        2. Otherwise call writeFile()
        */
    }
        
    /**
     *  Use FileDialog to get name
     *  Sets fname variable
     *  Calls writeFile()
     */
    private void saveFileAs()
    {
        System.out.println("Save File As");
        /*
        1. Open a FileDialog using *.jpad as the mask
        2. If user cancels then just display message in status line
        3. Otherwise, set fname to chosen name [use directory]
        4. Call writeFile();
        */
    }
    
    /**
     *  Reads current file from fname 
     *  Store result in TextArea
     *  Success/Failure displayed in status
     */
    private void readFile()
    {
        /*
        1. If fname equals "Untitled" clear ta, return
        2. Else Create a FileInputStream using fname
        3. Read the file
        4. Store the results in ta
        5. Display message in status line 
        */
    }

    /**
     *  Save current contents of TextArea 
     *  to the file named fname.
     *  Success/Failure displayed in status
     */
    private void writeFile()
    {
        /*
        1. Create a FileOutputStream using fname
        2. Write the contents of the file to disk
        3. Display message in status line
        */
    }
    
    private void quitApp()
    {
        dispose();
        System.exit(0);
    }
    
    // Main Method -------------------------------------
    public static void main(String[] args)
    {
        if (args.length > 0) new JPad(args[0]);
        else                 new JPad("Untitled");
    }
    
    // Attributes --------------------------------------
    private TextArea ta     = new TextArea();
    private String   fname  = "";
    private Label    status = new Label("Ready", Label.LEFT);
}