#!/usr/bin/env python

import curses
from curses import panel

class Menu(object):

	def __init__(self, items, stdscreen):
		self.window = stdscreen.subwin(0,0)
		self.window.keypad(1)
		self.panel = panel.new_panel(self.window)
		self.panel.hide()
		panel.update_panels()

		self.position = 0
		self.items = items
		self.items.append(('exit','exit'))

	def navigate(self, n):
		self.position += n
		if self.position < 0:
			self.position = 0
		elif self.position >= len(self.items):
			self.position = len(self.items)-1

	def display(self):
		self.panel.top()
		self.panel.show()
		self.window.clear()


		while True:
			self.window.refresh()
			curses.doupdate()
			for index, item in enumerate(self.items):
				if index == self.position:
					mode = curses.A_REVERSE
				else:
					mode = curses.A_NORMAL

				msg = '%d. %s' % (index, item[0])
				self.window.addstr(1+index, 1, msg, mode)

			key = self.window.getch()

			if key in [curses.KEY_ENTER, ord('\n')]:
				if self.position == len(self.items)-1:
					break
				else:
					self.items[self.position][1]()

			elif key == curses.KEY_UP:
				self.navigate(-1)

			elif key == curses.KEY_DOWN:
				self.navigate(1)

		self.window.clear()
		self.panel.hide()
		panel.update_panels()
		curses.doupdate()


class MyApp(object):

	def __init__(self, stdscreen):
		self.screen = stdscreen
		curses.curs_set(0)

		submenu_items = [
				('beep', curses.beep),
				('flash', curses.flash)
				]
		submenu = Menu(submenu_items, self.screen)

		main_menu_items = [
				('beep', curses.beep),
				('flash', curses.flash),
				('submenu', submenu.display)
				]
		main_menu = Menu(main_menu_items, self.screen)
		main_menu.display()

if __name__ == '__main__':
	curses.wrapper(MyApp)