package framework;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.awt.*;
import java.lang.reflect.*;


/**
 Utilities for unrelated tasks.
 */
public class FrameworkUtils {

	/**
	 * This method constructs a menu containing the specified items.
	 * The name of each item may contain the '&' character in front of the
	 * letter to be used as the keyboard shortcut for that item. Otherwise the
	 * first letter will be designated as the shortcut key.
	 *
	 * A null item indicates a separator.
	 *
	 * Here's a sample call:
	 *
	 *  JMenu fileMenu = makeMenu("&File", new String[]
	 *      {"&New", "&Save", "Sa&ve As", "&Load", "&Quit"});
	 *
	 * @param name  The name of the menu
	 * @param items The list of menu items
	 *
	 * @return The constructed menu
	 */
    public static JMenu makeMenu(String name, String[] items, Controller handler) {

         JMenu result;
         int j = name.indexOf('&');
         if ( j != -1) {
            char c = name.charAt(j + 1);
            String s = name.substring(0, j) + name.substring(j + 1);
            result = new JMenu(s);
            result.setMnemonic(c);
         } else {
            result = new JMenu(name);
         }

         MenuListener menuListener = new MenuListenerAdapter();

         for(int i = 0; i < items.length; i++) {
            if (items[i] == null) {
               result.addSeparator();
            } else {
               j = items[i].indexOf('&');
               JMenuItem item;
               if ( j != -1) {
                  char c = items[i].charAt(j + 1);
                  String s = items[i].substring(0, j) +
                     items[i].substring(j + 1);
                  item = new JMenuItem(s, items[i].charAt(j + 1));
                  item.setAccelerator(
                     KeyStroke.getKeyStroke(c, InputEvent.CTRL_MASK));
               } else { // no accelerator or shortcut key
                  item = new JMenuItem(items[i]);
               }
               item.addActionListener(handler);
               result.add(item);
            }
            result.addMenuListener(menuListener);
         }
         return result;
   }

    /**
	 * A simple utility for handling errors.
	 */
	 public static void error(String gripe) {
		 JOptionPane.showMessageDialog(null,
		    gripe,
	        "OOPS!",
	        JOptionPane.ERROR_MESSAGE);
      }


     /**
	 * A simple parser for converting strings into types.
	 */
	 public static Type getType(String typeName) throws AppError {
		Type result = null;
		try {
			return Class.forName(typeName);
		} catch (ClassNotFoundException e) {
			if (typeName.equals("int")) return Integer.TYPE;
			if (typeName.equals("double")) return Double.TYPE;
			if (typeName.equals("boolean")) return Boolean.TYPE;
			if (typeName.equals("void")) return Void.TYPE;
			if (typeName.equals("char")) return Character.TYPE;
			if (typeName.equals("float")) return Float.TYPE;
			if (typeName.equals("byte")) return Byte.TYPE;
			if (typeName.equals("short")) return Short.TYPE;
			if (typeName.equals("long")) return Long.TYPE;
			// more?
			throw new AppError("Unknown type: " + typeName);
		}
	}

}