# File: Exercise6_1.py
# Purpose:  A program that plays the game of Paper, Scissors, Rock!
# Author: Emily G. Allen (modified from code by D. Kumar)

# CONSTANTS:

# this way I don't have to keep track of which element in my list is which
DRAW = 0 
LOSE = 1
WIN = 2

# import the randrange function
from random import randrange 

# Function: Does me beat you? If so, return True, False otherwise.
def beats(me, you): 
    if me == 'Paper' and you == 'Rock':
        # Paper beats rock
        return True 

    elif me == 'Scissors' and you == 'Paper':
        # Scissors beat paper
        return True 

    elif me == 'Rock' and you == 'Scissors':
        # Rock beats scissors 
        return True 

    else: 
         False 

# Function: PlayGame
# Description: main code for playing the game
# Inputs: list of scores;
# Outputs: list of scores

def PlayGame(scores):
     # define items
    items = ['Rock', 'Paper', 'Scissors']

    done = 'N' # set flag for stopping

    # Player and Computer make their selection...
    yourChoice = input('Please enter Rock, Paper, or Scissors: ')
    myChoice = items[randrange(0, 3)] 

    # inform Player of choices
    print 'I picked', myChoice 
    print 'You picked', yourChoice 

    # Decide if it is a draw or a win for someone
    # update score count accordingly
    if myChoice == yourChoice:
        print 'We both picked the same thing.'
        print 'It is a draw.'
        scores[DRAW] = scores[DRAW] + 1 # use constants to access right index
    elif beats(myChoice, yourChoice):
        print 'Since', myChoice, 'beats', yourChoice, '...'
        print 'I win.'
        scores[LOSE] = scores[LOSE] + 1
    else: 
        print 'Since', yourChoice, 'beats', myChoice, '...'
        print 'You win.'
        scores[WIN] = scores[WIN] + 1

    done = input('Are you done playing (Y/N): ')

    # note: I can put in some fancy string processing here to help
    # guarantee what the user enters is formatted correctly.  For example
    done.capitalize() # incase they enter 'y' or 'n'
    
    if (done == 'Y'):
        return scores
    else:
        PlayGame(scores) # recurse
    
# Main program
def main():# Play Rock, Paper, Scissors!
    print 'Lets play Rock, Paper, Scissors!' # communicate w/user

    scores = [0,0,0] # initialize scoring list

    # play the game
    PlayGame(scores)

    print
    print '------------------------------------'
    print 'Score: Wins = ', scores[WIN], ' Loses = ', scores[LOSE], ' Draws = ', scores[DRAW]
    print 'Thank you for playing. Bye!' 

main() # invoke the program