import random
import time

# return random number 1 - 6
def dieRoll():
    roll = random.randint(1, 6)
    return roll

# see if the user wants to roll or not
# returns either R or H as a string
def userRollOrHold(roundScore, userScore, compScore):
    print("You have", userScore, "points.")
    print("Computer has", compScore, "points.")
    print("So far this round you have", roundScore, "points.")
    answer = input("(R)oll or (H)old? ")
    while answer != "R" and answer != "H":
        print("Please enter either 'R' or 'H'")
        answer = input("(R)oll or (H)old? ")        
    return answer

def compRollOrHold(roundScore, userScore, compScore):
    # wait a bit
    time.sleep(1.0)
    
    # if we will win with this round so far, hold
    if compScore + roundScore >= 100:
        print("Computer holds with", roundScore, "points.")
        return "H"
    
    # pick goal based on how close we are
    if userScore - compScore >= 20:
        # way behind
        goal = 22
    elif compScore - userScore >= 20:
        # way ahead
        goal = 10
    else:
        # close
        goal = 15
    
    if roundScore > goal:
        print("Computer holds with", roundScore, "points.")
        return "H"
    else:
        print("Computer rolls a ", end="")
        return "R"

# do one round of the game, either for player or computer
# returns the points won in the round
def gameRound(userTurn, userScore, compScore):
    roundScore = 0
    while True:
        if userTurn == True:
            roll = userRollOrHold(roundScore, userScore, compScore)
            if roll =="R":
                print("You rolled a ", end="")
        else:
            roll = compRollOrHold(roundScore, userScore, compScore)
        
        if roll == "R":
            amount = dieRoll()
            print(amount)
            if amount == 1:
                print("This is the end of your turn")
                return 0
            else:
                roundScore = roundScore + amount
        else:
            return roundScore

# function which runs the whole game
def game():
    userTurn = True
    userScore = 0
    compScore = 0
    
    # keep going until somebody wins
    while userScore < 100 and compScore < 100:
        # do one round of the game, and add in the points
        points = gameRound(userTurn, userScore, compScore)
        if userTurn == True:
            userScore = userScore + points
        else:
            compScore = compScore + points
        
        # switch the turn
        userTurn = not userTurn
        
        # put a blank line
        print()
    
    # announce the winner
    if userScore > compScore:
        print("Congratulations! You won!!")
    else:
        print("Sorry you lost :(")

# run the function to play the whole game
game()