#!/usr/bin/env python

import curses.wrapper

#-- Define the appearance of some interface elements
hotkey_attr = curses.A_BOLD | curses.A_UNDERLINE
menu_attr = curses.A_NORMAL

#-- Define additional constants
EXIT = 0
CONTINUE = 1

#-- Define default conversion dictionary
cfg_dict = {'target': 'DEFAULT.HTML',
            'source': 'txt2html.txt',
            'type':   'INFER',
            'proxy':  'NONE' }
counter = 0

#-- Give screen module scope
screen = None

#-- Create the topbar menu
def topbar_menu(menus):
    left = 2
    for menu in menus:
        menu_name = menu[0]
        menu_hotkey = menu_name[0]
        menu_no_hot = menu_name[1:]
        screen.addstr(1, left, menu_hotkey, hotkey_attr)
        screen.addstr(1, left+1, menu_no_hot, menu_attr)
        left = left + len(menu_name) + 3
        # Add key handlers for this hotkey
        topbar_key_handler((menu_hotkey.upper(), menu[1]))
        topbar_key_handler((menu_hotkey.lower(), menu[1]))
    # Little aesthetic thing to display application title
    screen.addstr(1, left-1, "SaberNet DCS".center(79-left), curses.A_STANDOUT) 
    screen.refresh()

#-- Magic key handler both loads and processes keys strokes
def topbar_key_handler(key_assign=None, key_dict={}):
    if key_assign:
        key_dict[ord(key_assign[0])] = key_assign[1]
    else:
        c = screen.getch()
        if c in (curses.KEY_END, ord('!')):
            return 0
        elif c == ord('s'):
            y,x = screen.getyx()
            screen.move(y+1, x)
        elif c not in key_dict.keys():
            curses.beep()
            curses.flash()
            return 1
        else:
            return eval(key_dict[c])

#-- Display the currently selected options
def draw_dict():
    screen.addstr(5,33, " "*43, curses.A_NORMAL)
    screen.addstr(8,33, " "*43, curses.A_NORMAL)
    screen.addstr(11,33, " "*43, curses.A_NORMAL)
    screen.addstr(14,33, " "*43, curses.A_NORMAL)
    screen.addstr(5, 33, cfg_dict['source'], curses.A_STANDOUT)
    screen.addstr(8, 33, cfg_dict['target'], curses.A_STANDOUT)
    screen.addstr(11,33, cfg_dict['type'], curses.A_STANDOUT)
    screen.addstr(14,33, cfg_dict['proxy'], curses.A_STANDOUT)
    screen.addstr(17,33, str(counter), curses.A_STANDOUT)
    screen.refresh()

def main(stdscr):
    # Frame the interface area at fixed VT100 size
    global screen
    screen = stdscr.subwin(23, 79, 0, 0)
    screen.box()
    screen.hline(2, 1, curses.ACS_HLINE, 77)
    screen.refresh()

    # Define the topbar menus
    file_menu = ("File", "file_func()")
    proxy_menu = ("Proxy Mode", "proxy_func()")
    doit_menu = ("Do It!", "doit_func()")
    help_menu = ("Help", "help_func()")
    exit_menu = ("Exit", "EXIT")
    # Add the topbar menus to screen object
    topbar_menu((file_menu, proxy_menu, doit_menu, help_menu, exit_menu))

    # Enter the topbar menu loop
    while topbar_key_handler():
        draw_dict()

if __name__ == "__main__":
    curses.wrapper(main)