def randint(a, b):
    return a + randbelow(b - a + 1)

def randbelow(n):
    if n <= 0:
        raise ValueError
    k = n.bit_length()
    numbytes = (k + 7) // 8
    while True:
        r = int.from_bytes(random_bytes(numbytes), 'big')
        r >>= numbytes * 8 - k
        if r < n:
            return r

def random_bytes(n):
    with open('/dev/urandom', 'rb') as file:
        return file.read(n)


def main():
    print ("Welcome to Roulette. You may place your bet on odd, even or zero"
            "\nif you bet on zero and win , you win 35 times the amount you bet."
            "\nYou can choose Q to quit the game."
            "\nThe game ends automatically if yoy run out of money.\n")

    print ("Please enter the amount you have:\t")
    wheel = 36
    amount = int(input())
    bet = 0
    choice = ""
    wins = 0
    loss = 0
    choices = ['e', 'o', 'z', 'q', 'Q', 'E', 'Z']

    while amount != 0 or choice not in ['Q', 'q']:
        print ("Please enter your choice (Even, Odd, Zero or Quit : ")
        choice = input()

        if choice not in choices:
            print("INVALID INPUT. PLEASE CHECK YOUR INPUT\n")
            return
        if choice in ['Q', 'q']:
            print("Your remaining money is :$ ", amount)
            print("Number of wins : ", wins )
            print("Number of losses : ", loss)
            break

        print ("Enter the amount of bet : ")
        bet = int(input())

        while bet <= 0 or bet > amount:
            if bet <= 0:
                print("Bets must be greater than 0\n")
                print ("Enter the amount of bet : ")
                bet = int(input())
            if bet > amount:
                print("You may not bet more than you have(",amount,")")
                print ("Enter the amount of bet : \t")
                bet = int(input())
        wheel = randint(0, 36)
        print ("The wheel came up with number :", wheel)

        if wheel % 2 == 0 and (choice in ['e', 'E']):
            amount = amount + bet
            wins = wins + 1
            print("You win! You now have $", amount)
        elif wheel % 2 != 0 and (choice in ['o', 'O']):
            amount = amount + bet
            wins = wins + 1
            print("You win! You now have $", amount)
        elif wheel == 0 and choice in ['z', 'Z']:
            amount = amount + (35*bet)
            wins = wins + 1
            print("You win! You now have $", amount)
        else:
            amount = amount - bet
            loss = loss + 1
            print("Sorry, you lose. You now have $", amount)

            if amount == 0:
                print("Your remaining money is $0")
                print("Number of wins : ", wins)
                print("Number of losses : ", loss)
                break

    print ("Thanks for playing")

if __name__ == "__main__":

    main()