import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.io.*;    // bring in all the stream i/o stuff
import java.text.*;



public class IOSample extends JFrame{    // inherit JFrame

   StudentList studentList = new StudentList();
  

/**
 * This Constructor sets up the window and creates a simple menu
 */
  public IOSample(String[] arguments) {
//
// setup the frames banner/title bar   
//
     super("IOSample");  // call JFrame's constructor and give it a title
     setSize(500,300);  // set the width of the window to 500 pixels, height to 300.
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // exit the whole program when this frame is closed
//
// Create a simple menu
//
    JMenuBar mainMenu = new JMenuBar();  // create a menubar

    JMenu fileMenu = new JMenu("File");       // Create the file menu
    fileMenu.setMnemonic(KeyEvent.VK_F); // set its Alt character sequence

    addMenuItem(fileMenu, "Open", KeyEvent.VK_O, KeyEvent.VK_O,KeyEvent.CTRL_MASK,new FileOpenMenuListener());
    addMenuItem(fileMenu, "Report", KeyEvent.VK_R, KeyEvent.VK_R,KeyEvent.CTRL_MASK,new FileReportMenuListener());
    fileMenu.addSeparator();  // add a separator between open and exit
    addMenuItem(fileMenu, "Exit", KeyEvent.VK_X,KeyEvent.VK_X,KeyEvent.CTRL_MASK,new FileExitMenuListener());

    mainMenu.add(fileMenu);  // add the file menu to the main menu bar
   setJMenuBar(mainMenu);
//
// if the first argument exists, use it to load the studentlist
//
   getContentPane().add("Center",studentList);  // place studentList on the content pane
   
   if(arguments.length > 0)
   {
    try{
     studentList.load(arguments[0]);
     setTitle(arguments[0]);
    }
    catch(IOException e) {
      setTitle("");
      JOptionPane.showMessageDialog(this,"Unable to load file : "+arguments[0], 
         "IOException",JOptionPane.ERROR_MESSAGE);  // popup an error message 

    }
   }
   
}

/**
 * This routine creates and adds a menu item to a menu
 *  @param menu reference to a JMenu object to add this item to
 *  @param text  text string to appear on the menu
 *  @param mnemonic virtual key to use as the mnemonic for the item e.g. KeyEvent.VK_F
 *  @param acceleratorKey virtual key to use for the keyboard accelerator, e.g. KeyEvent.VK_O
 *  @param acceleratorModifier virtual mask to use as a modifier, eg. KeyEvent.CTRL_MASK
 *  @param listener reference to an object that implements an ActionListener
 */
void addMenuItem(JMenu menu, String text, int mnemonic, int acceleratorKey, int acceleratorModifier, ActionListener listener) {
    JMenuItem anItem;
    anItem = new JMenuItem(text,mnemonic);    // create a menu item.
    anItem.setAccelerator(KeyStroke.getKeyStroke(acceleratorKey,acceleratorModifier)); // define accelerator for open
    anItem.addActionListener(listener);      // tell menuitem what object will listen for it.
    menu.add(anItem);                        // add the item to the menu
}

/*********************************
 *  Main routine
 */
  public static void main(String[] arguments){

    IOSample fr = new IOSample(arguments);  // create the sample 2 frame
    fr.setVisible(true);         // allow it to be seen
 
  }


/*******************************************************************
 * Inner Classes, one acts as a listener for each user menu item
 *
 */

/**
 * Handle the File-Exit menu item
 */
class FileExitMenuListener implements ActionListener{
	public void actionPerformed(ActionEvent event)
	{
	  System.exit(0);
	}
}

/**
 * Handle the File-Open menu item
 */
class FileOpenMenuListener implements ActionListener{
	public void actionPerformed(ActionEvent event)
	{
         String input;
	 JFileChooser dialog = new JFileChooser();  // create the chooser object
         int result = dialog.showOpenDialog(IOSample.this); // use Open for input file
         if(result == JFileChooser.APPROVE_OPTION) {
             input = dialog.getSelectedFile().getPath();
             try{
               studentList.load(input);
               setTitle(input);
             }
             catch(IOException e) {
               JOptionPane.showMessageDialog(IOSample.this,"Unable to load file : "+input, 
               "IOException",JOptionPane.ERROR_MESSAGE);  // popup an error message 
              setTitle("");
             }
         }
         else
          return;
        }	
}

/**
 * Handle the File-Report menu item
 */
class FileReportMenuListener implements ActionListener{
	public void actionPerformed(ActionEvent event)
	{
         String output;
 	 JFileChooser dialog = new JFileChooser();  // create the chooser object

         int result = dialog.showSaveDialog(IOSample.this); // use Save for output file
         if(result == JFileChooser.APPROVE_OPTION) {
             output = dialog.getSelectedFile().getPath();
             studentList.summaryHTMLReport(output);
         }
         else
          return;
	}

}


}// end of the class