# File: upc.py

# based on differences.py

from Tkinter import *

master = Tk()

bigfont = "Helvetica 24"
barWidth = 5
barHeight = 200
digFont = "Helvetica 48"
digWidth = 30
digHeight = 40

# manu[facturer] (6 digits)
# item (5 digits)

# compute check
def checkDigit(first,second):
	(d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11) = [int(s) for s in first+second]
	step1 = (d1+d3+d5+d7+d9+d11)*3
	step2 = step1+d2+d4+d6+d8+d10
	step3 = (-step2)%10
	return str(step3)

bitPats = ["0001101", "0011001", "0010011", "0111101", "0100011",
	"0110001", "0101111", "0111011", "0110111", "0001011"]

def flipBit(bit):
	if bit == "0": return "1"
	return "0"

def flipString(bitString):
	return "".join([flipBit(bit) for bit in bitString])

# run the engine
def makeCode(event):
	firstBlock = manuIn.get()
	if len(firstBlock) != 6: firstBlock = "000000"
	manuIn.delete(0,END) 
	manuIn.insert(INSERT, firstBlock)
	#
	secondBlock = itemIn.get()
	if len(secondBlock) != 5: secondBlock = "00000"
	itemIn.delete(0,END) 
	itemIn.insert(INSERT, secondBlock)
	#
	checkBlock = checkDigit(firstBlock,secondBlock)
	#
	allBits = "101"+"".join([bitPats[int(i)] for i in firstBlock])
	print allBits
	allBits = allBits+"01010"+"".join([flipString(bitPats[int(i)]) for i in secondBlock+checkBlock])+"101"
	print firstBlock, secondBlock, checkBlock
	print allBits
	#
	for i in range(len(allBits)):
		if allBits[i] == "1":
			codeOut.create_rectangle(digWidth+i*barWidth, 0, digWidth+(i+1)*barWidth, barHeight, fill="black",tags="bar",width=0)
		if allBits[i] == "0":
			codeOut.create_rectangle(digWidth+i*barWidth, 0, digWidth+(i+1)*barWidth, barHeight, fill="white",tags="bar",width=0)
	#
	codeOut.create_rectangle(digWidth+barWidth*10,barHeight-digHeight*1.25,digWidth+barWidth*10+barWidth*7*5,barHeight,fill="white",tag="back",width=0)
	codeOut.create_rectangle(digWidth+barWidth*14+barWidth*7*5,barHeight-digHeight*1.25,digWidth+barWidth*14+barWidth*7*10,barHeight,fill="white",tag="back",width=0)
	#
	codeOut.delete("dig")
	drawDig(-1,firstBlock[0])
	for i in [1,2,3,4,5]:
		drawDig(1+i,firstBlock[i])
	for i in [0,1,2,3,4]:
		drawDig(9+i,secondBlock[i])
	drawDig(16,checkBlock)

def drawDig(pos,dig):
	digOffset = barHeight - digHeight/2
	digShift = digWidth/2
	codeOut.create_text(digShift+(1+pos)*digWidth,digOffset,text=dig,tag="dig",font=digFont)

# Start widgets
manuLb = Label(master, text="Manufacturer (6 digits)", font=bigfont)
manuLb.grid(row=0,column=0)
manuIn = Entry(master, width=6, font=bigfont)
manuIn.grid(row=0,column=1)
manuIn.bind('<Return>',makeCode)
itemLb = Label(master, text="Item code (5 digits)", font=bigfont)
itemLb.grid(row=0,column=2)
itemIn = Entry(master, width=5, font=bigfont)
itemIn.grid(row=0,column=3)
itemIn.bind('<Return>',makeCode)

codeOut = Canvas(master, width=barWidth*95+2*digWidth, height=barHeight)
codeOut.grid(row=1,column=0,columnspan=4)

makeCode(0)
master.mainloop()

# 0016600000708