# Rock-paper-scissors-lizard-Spock template

# The key idea of this program is to equate the strings
# "rock", "paper", "scissors", "lizard", "Spock" to numbers
# as follows:
#
# 0 - rock
# 1 - Spock
# 2 - paper
# 3 - lizard
# 4 - scissors

def number_to_name(number):
    # convert number to a name using if/elif/else
    if number == 0:
        name = "rock"
    elif number == 1:
        name = "Spock"
    elif number == 2:
        name = "paper"
    elif number == 3:
        name = "lizard"
    elif number == 4:
        name = "scissors"

    return(name)

def name_to_number(name):
    # convert name to number using if/elif/else
    if name == "rock":
        number = 0
    elif name == "Spock":
        number = 1
    elif name == "paper":
        number = 2
    elif name == "lizard":
        number = 3
    elif name == "scissors":
        number = 4

    return(number)

def rpsls(name):
    # compute random guess for comp_number using random.randrange()
    import random
    comp_number = random.randrange(5)

    # convert comp_number to name using number_to_name
    comp_name = number_to_name(comp_number)

    # convert name to player_number using name_to_number
    player_number = name_to_number(name)

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

    # use if/elif/else to determine winner
    if player_number == 2 or player_number == 3 or player_number == 4:
        if difference == 1 or difference == 2:
            winner = player_number
        elif difference == 0:
            winner = -1
        else:
            winner = comp_number

    elif player_number == 0 or player_number == 1:
        if difference == -1 or difference == -2:
            winner = comp_number
        elif difference == 0:
            winner = -1
        else:
            winner = player_number

    # print results
    print "\nPlayer chooses", name
    print "Computer chooses", comp_name

    if winner == comp_number:
        print "Computer wins!"
    elif winner == player_number:
        print "Player wins!"
    else:
        print "Player and computer tie!"

rpsls("rock")
rpsls("Spock")
rpsls("paper")
rpsls("lizard")
rpsls("scissors")