# Python Tic-Tac-Toe by D10d3
# Goals:
# 	play tic tac toe with computer
# Optional future goals
# 	ask to play again
# 	keep score of games
# 	ask player if X or O
# 	ask player if they want to go first
#	Better Computer Logic
#**********************************************************************************************

# SETUP
import os
os.system('cls') #Clears the screen on windows machines
import random
board = [' ',' ',' ',' ',' ',' ',' ',' ',' ']

#Sub Routines
def ClearScreen():
	os.system('cls') #Clears the screen on windows machines
	
def ClearBoard():# assign board variables using a list numbered 0-8 for the 9 slots, defaulting to ' ' as empty
	board = [' ',' ',' ',' ',' ',' ',' ',' ',' ']

def PrintExampleBoard (): #Example board to for player move selection
	print "-------------"
	print "| 1 | 2 | 3 |"
	print "-------------"
	print "| 4 | 5 | 6 |"
	print "-------------"
	print "| 7 | 8 | 9 |"
	print "-------------\n"
	
def PrintBoard (): #Prints the current board
	print "Current Board Positions:"
	print "-------------"
	print "|", board[0] , "|" , board[1] , "|" , board[2] , "|"
	print "-------------"
	print "|", board[3] , "|" , board[4] , "|" , board[5] , "|"
	print "-------------"
	print "|", board[6] , "|" , board[7] , "|" , board[8] , "|"
	print "-------------\n"

def PlayerTurn(board): #player selects move and it checks if it's valid and applies it to the board
	valid = False
	while not valid:
		print "Select a square to mark (1-9):"
		p_choice = raw_input('>')
		if p_choice == '1' or '2' or '3' or '4' or '5' or '6' or '7' or '8' or '9':
			valid = True
		else:
			print '"' , p_choice , 'is not a valid move'
			valid = False
		if p_choice == "1" and board[0] == " ":
			board[0] = "X"
		elif p_choice == "2" and board[1] == " ":
			board[1] = "X"
		elif p_choice == "3" and board[2] == " ":
			board[2] = "X"
		elif p_choice == "4" and board[3] == " ":
			board[3] = "X"
		elif p_choice == "5" and board[4] == " ":
			board[4] = "X"
		elif p_choice == "6" and board[5] == " ":
			board[5] = "X"
		elif p_choice == "7" and board[6] == " ":
			board[6] = "X"
		elif p_choice == "8" and board[7] == " ":
			board[7] = "X"
		elif p_choice == "9" and board[8] == " ":
			board[8] = "X"
		else:
			print '"' , p_choice , '" is not a valid move'
			valid = False
	return board

def ComputerTurn(board): #Computer selects move and it checks if it's valid and applies it to the board
	valid = False
	while not valid:
		ComputerOptions = ['1','2','3','4','5','6','7','8','9']
		p_choice = random.choice(ComputerOptions)
		valid = True
		if p_choice == "1" and board[0] == " ":
			board[0] = "O"
		elif p_choice == "2" and board[1] == " ":
			board[1] = "O"
		elif p_choice == "3" and board[2] == " ":
			board[2] = "O"
		elif p_choice == "4" and board[3] == " ":
			board[3] = "O"
		elif p_choice == "5" and board[4] == " ":
			board[4] = "O"
		elif p_choice == "6" and board[5] == " ":
			board[5] = "O"
		elif p_choice == "7" and board[6] == " ":
			board[6] = "O"
		elif p_choice == "8" and board[7] == " ":
			board[7] = "O"
		elif p_choice == "9" and board[8] == " ":
			board[8] = "O"
		else:
			valid = False
	return board

def DidPlayerWin(board,Playing):
	# 3 Across Wins
	if board[0] == "X" and board [1] == "X" and board[2] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	elif board[3] == "X" and board [4] == "X" and board[5] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	elif board[6] == "X" and board [7] == "X" and board[8] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	# 3 Down Wins
	elif board[0] == "X" and board [3] == "X" and board[6] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	elif board[1] == "X" and board [4] == "X" and board[7] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	elif board[2] == "X" and board [5] == "X" and board[8] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	# Diagonal Wins
	elif board[0] == "X" and board [4] == "X" and board[8] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	elif board[2] == "X" and board [4] == "X" and board[6] == "X":
		ClearScreen()
		PrintBoard()
		print "You Win!"
		quit()
	# No Win
	else:
		Playing = True
	return Playing
	
def DidComputerWin(board,Playing):
	# 3 Across Wins
	if board[0] == "O" and board [1] == "O" and board[2] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	elif board[3] == "O" and board [4] == "O" and board[5] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	elif board[6] == "O" and board [7] == "O" and board[8] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	# 3 Down Wins
	elif board[0] == "O" and board [3] == "O" and board[6] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	elif board[1] == "O" and board [4] == "O" and board[7] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	elif board[2] == "O" and board [5] == "O" and board[8] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	# Diagonal Wins
	elif board[0] == "O" and board [4] == "O" and board[8] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	elif board[2] == "O" and board [4] == "O" and board[6] == "O":
		ClearScreen()
		PrintBoard()
		print "The Computer Wins"
		quit()
	# No Win
	else:
		Playing = True
	return Playing

def IsDraw(board,Playing):#Determines if the game ended in a draw
	if board[0] != " " and board[1] != " " and board[2] != " " and board[3] != " " and board[4] != " " and board[5] != " " and board[6] != " " and board[7] != " " and board[8] != " ":
		ClearScreen()
		PrintBoard()
		print "The Game Ended in a Draw"
		quit()
	else:
		Playing = True
	return Playing
	
#Introduction
print "lets play Tic-Tac-Toe"
print "You are X's and get to go first\n"
raw_input ("Press Any Key To Begin")

#Game Loop	
Playing = True
while Playing == True:
	ClearScreen()
	PrintBoard()
	PrintExampleBoard()
	board = PlayerTurn(board)
	Playing = DidPlayerWin(board,Playing)
	Playing = IsDraw(board,Playing)
	board = ComputerTurn(board)
	Playing = DidComputerWin(board,Playing)
	Playing = IsDraw(board,Playing)