#!/usr/bin/env python
# encoding: utf-8
 
import RPi.GPIO as GPIO
from sh import shutdown
import uinput
 
# Script de test permettant de simuler l'appui sur la touche echap avec un bouton mettant a la masse la broche 23 de la Raspberry Pi
# Si la broche 24 est mise a la masse le script va éteindre le rasbarry proprement (mais pas électriquement)
# 
# Nécessites les libs evdev et sh : 
# pip install sh evdev
#
# Source simulation de clavier avec evedv : 
# https://stackoverflow.com/questions/2575528/simulating-key-press-event-using-python-for-linux#adzerk9805928
#
# Tuto utilisation boutons et GPIO :
# http://makezine.com/projects/tutorial-raspberry-pi-gpio-pins-and-python/
 
#Initalise GPIO INPUTs with pull_ups
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(24, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(25, GPIO.IN, pull_up_down = GPIO.PUD_UP)


import uinput
import time

#Virtual Keyboard device to simulate key events
events = (
    uinput.KEY_ESC,
    uinput.KEY_TAB
    )
device = uinput.Device(events)

def simulate_key(code):
    device.emit(code, 1) # Press.
    time.sleep(0.1)
    device.emit(code, 0) # Release.
 
def echap(*args,**kwargs):
    print("echap")
    simulate_key(uinput.KEY_ESC)
 
def tab(*args,**kwargs):
    print("tab")
    simulate_key(uinput.KEY_TAB)
 
 
#Add lisneners on GPIOs pins 23 & 25 
GPIO.add_event_detect(23, GPIO.FALLING, callback=echap, bouncetime=300)
GPIO.add_event_detect(25, GPIO.FALLING, callback=tab, bouncetime=300)

print("Started") 
#Wait for a falling edge on GPIO 24 to shut down the system
GPIO.wait_for_edge(24, GPIO.FALLING)
GPIO.cleanup()
shutdown('-h','now')