# Rock-paper-scissors-lizard-Spock
# COURSERA Python simple project

# equate the strings
# "rock", "paper", "scissors", "lizard", "Spock" to numbers:
#
# 0 - rock
# 1 - Spock
# 2 - paper
# 3 - lizard
# 4 - scissors

# random.randrange() so we need to import random
import random

def name_to_number(name):

    if (name == "rock"): return 0
    if (name == "Spock"): return 1
    if (name == "paper"): return 2
    if (name == "lizard"): return 3
    if (name == "scissors"): return 4
    return -1


def number_to_name(number):

    if (number == 0): return "rock"
    if (number == 1): return "Spock"
    if (number == 2): return "paper"
    if (number == 3): return "lizard"
    if (number == 4): return "scissors"
    return "Bad number entered"

def rpsls(player_choice):

    # print a blank line to separate consecutive games
    print

    # print out the message for the player's choice
    print "Player chooses", player_choice

    # convert the player's choice to player_number
    player_number = name_to_number(player_choice)

    # compute random guess for comp_number using random.randrange()
    comp_number = random.randrange(5)

    # convert comp_number to comp_choice
    comp_choice = number_to_name(comp_number)

    # print out the message for computer's choice
    print "Computer chooses", comp_choice

    # compute difference of comp_number and player_number modulo five
    diff = (comp_number - player_number) % 5

    # determine winner, print winner message
    if (diff == 1 or diff == 2): winner = "Computer"
    elif (diff == 3 or diff == 4): winner = "Player"
    elif (diff == 0): winner = "Tie"
    else: winner = ""

    if (winner == "Tie"): print "Player and computer tie!"
    else: print winner, "wins!"


# test code
rpsls("rock")
rpsls("Spock")
rpsls("paper")
rpsls("lizard")
rpsls("scissors")