// Copyright (c) 2007, Mihai Preda.
// Licensed under the MIT License.

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;


class Menu extends Cmd implements CommandListener {
    
    static Command cmdBack = new Command("Back", Command.BACK, 2);
    static void setBackText(String backText) {
        cmdBack = new Command(backText, Command.BACK, 200);
    }

    Menu(String label, Command children[]) {
        this(label, children, 0);
    }

    Menu(String label, Command children[], int selectedIndex) {
        super(label, -1);
        this.children = children;
        int nChildren = children.length;
        String childLabels[] = new String[nChildren];
        for (int i = 0; i < nChildren; ++i) {
            childLabels[i] = children[i].getLabel();
        }
        list = new List(label, List.IMPLICIT, childLabels, null);
        if (selectedIndex >= 0 && selectedIndex < nChildren) {
            list.setSelectedIndex(selectedIndex, true);
        }
        list.addCommand(cmdBack);
        list.setCommandListener(this);
    }

    void addCommandsTo(Displayable d) {
        for (int i = 0; i < children.length; ++i) {
            d.addCommand(children[i]);
        }
        d.setCommandListener(this);
    }

    void setParent(MIDlet midlet, Displayable parent) {
        this.midlet  = midlet;
        this.parent  = parent;
        int nChildren = children.length;
        for (int i = 0; i < nChildren; ++i) {
            if (children[i] instanceof Menu) {
                ((Menu)children[i]).setParent(midlet, list);
            }
        }
    }

    public void commandAction(Command cmd, Displayable cmdSource) {
        if (display == null) {
            display = Display.getDisplay(midlet);
        }
        if (cmd.getCommandType() == Command.BACK) {
            Log.log("back to " + parent);
            display.setCurrent(parent);
            return;
        }
        //int index = ((List)cmdSource).getSelectedIndex();
        Command child = (cmdSource==list)?children[list.getSelectedIndex()]:cmd;
        Log.log("cmd " + cmd + " child " + child + " source " + cmdSource);
        if (child instanceof Menu) {
            display.setCurrent(((Menu)child).list);
        } else {
            ((CommandListener)midlet).commandAction(child, parent);
        }
    }

    Command[] children;
    List list;
    Displayable parent;
    MIDlet midlet;
    Display display;
}