#import required modules
import tclsimpl
import sys
if sys.version < '3':
      from Tkinter import *
      import tkMessageBox
else:
      from tkinter import *
      from tkinter import messagebox

# defines
BRINKY_RITE = 0

global leds

def deconstructMsg(nee):
        # extract the incoming message
        intoken,status = nee.unpackMsg(nee.BIN, "hb")

        if intoken == BRINKY_RITE:
               for num in range(8):
                       bit = 1 << num
                       if status & bit:
                               leds[num]["text"] = "ON"
                       else:
                               leds[num]["text"] = "OFF"


# define functionality to be performed whan a message is received
def hndlMessage(a, b):
       # receive a message
       messageSize, senderId = nee.receive()

       if messageSize == -1:
               # error
               print("receive error")
               sys.exit(-1)

      # examine the message
      deconstructMsg(nee)

      # reply to sending program
      retVal = nee.reply(senderId)
      if retVal == -1:
               print("reply error")
               sys.exit(-1)

# define callback function when exit button is selected
def finish(event):
      sys.exit(0)


#***** main part of program ******************************

# constructor for simpl class object
nee = tclsimpl.Simpl("8000:localhost:ARDUINO")

# initialize Tk for graphics
root = Tk()

# get the receive fifo file descriptor
fd = nee.whatsMyFd()

# attach a callback for incoming simpl messages
root.tk.createfilehandler(fd, READABLE, hndlMessage)

rowframe = Frame(root)
rowframe.pack(fill=BOTH)

leds = [None] * 8
for num in range(8):

     leds[num] = Button(rowframe,  borderwidth=2, relief=SOLID, justify=CENTER, bg="Yellow", fg="Black", text="OFF", font=("Times", 12, "bold"), width=3)
     leds[num].pack(side=LEFT)

# the bottom frame of buttons
rowframe = Frame(root)
rowframe.pack(fill=BOTH)

# build an exit button widget
button = Button(root)
button["text"] = "Exit"
button.bind("<Button>", finish)
button.pack()

# handle user input and simpl messaging
root.mainloop()