#program to play a 2-player dice game
import random
#subroutine to get and validate menu choice
def menuChoice ():
    print("\nOption 1: Display rules")
    print("Option 2: Start new game")
    print("Option 3: Quit")
    choice = input("What would you like to do? ") 
    while choice <"1" or choice>"3":
        print ("That is not a valid choice.")
        choice =(input ("Please enter a number between 1 and 3: "))        
    return (choice)

#subprogram to display rules
def displayRules():
    print(
        """
\nThe rules of the game are as follows:\n
Players take turns to throw two dice.
If the throw is a ‘double’, i.e. two 2s, two, threes, etc.,
the player’s score reverts to zero and their turn ends.
If the throw is not a ‘double’, the total shown on the two dice
is added to the player’s score.
A player may have as many throws as they like in any turn
until they either throw a double or pass the dice. 
The first player to reach a score of 50 wins the game.
    """
    )

# subprogram for each player to take a turn
def playerTurn(player, score):     
        
    print ("\n\nYour turn, ", player)
    anotherGo = "Y"
    scoreThisTurn = 0
    while anotherGo=="Y" or anotherGo =="y":
        die1 = random.randint(1,6)
        die2 = random.randint(1,6)
        print ("You rolled", die1,"and", die2)
        if die1==die2:
            scoreThisTurn = 0
            cumulativeScore = 0
            print("Bad luck! Press Enter to continue")
            wait = input()
            anotherGo = "N"
        else:
            scoreThisTurn = scoreThisTurn + die1 + die2           
            cumulativeScore = score + scoreThisTurn
            print ("\nYour score this turn is",scoreThisTurn)
            print(player, "Your cumulative score is...",cumulativeScore)
            if cumulativeScore>=50:
                return(cumulativeScore)
            print("\nAnother go? (Answer Y or N)")
            anotherGo = input()      
    return (cumulativeScore)
    
    #end turn
            
#subprogram to play game
def playGame():   
    score1=0
    score2=0
    player1 = input("enter Player1's name: ")
    player2 = input("enter Player2's name: ")
    while score1<50 and score2<50:
        totalScore = playerTurn(player1, score1)
        score1 = totalScore
        if score1>=50:
            print("You win!")
        else:
            totalScore = playerTurn(player2, score2)
            score2=totalScore
            if score2>=50:
                print("You win!")             
    
#main prog
option = menuChoice()
while int(option)!=3:
    if int(option) == 1:
        displayRules()
                
    else:
        playGame()
        
    option = menuChoice()
print ("\nGoodbye!")
        
#end of program