#!/usr/bin/env python

import curses, thread, threading, os
import RPi.GPIO as GPIO

def pin_setup():
    global PIN
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(PIN, GPIO.OUT)
    GPIO.output(PIN, GPIO.LOW)

def quit(ret):
    curses.nocbreak()
    stdscr.keypad(0)
    curses.echo()
    curses.endwin()
    GPIO.cleanup()
    os._exit(ret)

def print_time(t):
    y, x = stdscr.getmaxyx()
    stdscr.clear()
    stdscr.addstr(y / 2, x / 2, "{0}".format(t), curses.A_BOLD)
    stdscr.refresh()

def lt():
    global PIN
    global pin_stat
    if pin_stat:
        GPIO.output(PIN, GPIO.LOW)
        pin_stat = False

def gt():
    global PIN
    global pin_stat
    if not pin_stat:
        GPIO.output(PIN, GPIO.LOW)
        pin_stat = True

def update():
    global sec
    print_time(sec)
    if sec <= 0:
        lt()
    else:
        gt()

def read():
    global sec
    global sec_lck
    while 1:
        c = stdscr.getch()
        if c == ord('q') or c == ord('Q'):
            quit(0)
        elif c == curses.KEY_UP:
            sec_lck.acquire()
            try:
                sec += 1
                update()
            finally:
                sec_lck.release()
        else:
            pass

def timer():
    global sec
    global sec_lck
    threading.Timer(0.1, timer).start()
    sec_lck.acquire()
    try:
        if not sec <= 0:
            sec -= 1
        update()
    finally:
        sec_lck.release()

PIN = 10
pin_stat = False
sec = 0
sec_lck = threading.Lock()

pin_setup()

stdscr = curses.initscr()
curses.noecho()
curses.cbreak()
stdscr.keypad(1)
curses.curs_set(0)

update()

read_th = threading.Thread(target = read)

read_th.start()
timer()
read_th.join()

quit(0)