import random

# Check that users have entered a valid
# option based on a list
def string_checker(question, valid_ans=('yes', 'no')):

    error = f"Please enter a valid option from the following list: {valid_ans}"

    while True:

        # Get user response and make sure it's lowercase
        user_response = input(question).lower()

        for item in valid_ans:
            # check if the user response is a word in the list
            if item == user_response:
                return item

            #check if the user response is the same as
            # the first letter of an item in the list
            elif user_response == item[0]:
                return item

        # print error if the user does not enter something that is valid
        print(error)
        print()


# Displays instructions
def instructions():
    """Prints instructions"""

    print("""
*** Instructions ***

To begin, choose the number of questions that you want (or press <enter> for infinite mode).

Then, you will be asked what a power or square root of a number equals. 
Enter your answer and ensure that it's rounded to two decimal places (please be very careful with your rounding).

At the end of the quiz, you will be provided with your score. 
Try and improve upon your previous score when you play.

Press <xxx> to end the game at anytime.

Good luck!
    """)

# checks for an integer more than 0 (allows <enter>)
def int_check(question):
    while True:
        error = "Please enter an integer that is 1 or more."

        to_check = input(question)

        # check for infinite mode
        if to_check == "":
            return "infinite"

        try:
            response = int(to_check)

            # checks that number is more than / equal to 1
            if response < 1:
                print(error)
            else:
                return response

        except ValueError:
            print(error)


# compares user / computer choice and returns
# result (win / lose / tie)
def rps_compare(user, comp):

    # If the user and the computer choice is the same, it's a tie
    if user == comp:
        result = "tie"

    # There are three ways to win
    elif user == "paper" and comp == "rock":
        result = "win"
    elif user == "scissors" and comp == "paper":
        result = "win"
    elif user == "rock" and comp == "scissors":
        result = "win"

    # if it's not a win / tie, then it's a loss
    else:
        result = "lose"

    return result



# Main Routine Starts here

# Initialise game variables
mode = "regular"
rounds_played = 0

rps_list = ["rock", "paper", "scissors", "xxx"]

print("💎📑✂ Rock / Paper / Scissors Game ✂📑💎")
print()

# ask the user if they want to see the instructions and display
# them if requested
want_instructions = string_checker("Do you want to read the instructions? ")

# checks users enter yes (y) or no (n)
if want_instructions == "yes":
    instructions()

# Ask user for number of rounds / infinite mode
num_rounds = int_check("How many rounds would you like? Push <enter> for infinite mode: ")

if num_rounds == "infinite":
    mode = "infinite"
    num_rounds = 5

# Game loop starts here
while rounds_played < num_rounds:

    # Rounds headings (based on mode)
    if mode == "infinite":
        rounds_heading = f"\n⚇⚇⚇ Round {rounds_played + 1} (Infinite Mode) ⚇⚇⚇"
    else:
        rounds_heading = f"\n💿💿💿 Round {rounds_played + 1} of {num_rounds} 💿💿💿"

    print(rounds_heading)

    # randomly choose from the rps list (excluding the exit code)
    comp_choice = random.choice(rps_list[:-1])
    print("Computer choice", comp_choice)

    # get user choice
    user_choice = string_checker("Choose: ", rps_list)
    print("you chose", user_choice)

    # check if user choice is the exit code
    if user_choice == "xxx":
        break

    result = rps_compare(user_choice, comp_choice)
    print(f"{user_choice} vs {comp_choice}, {result}")

    rounds_played += 1

    # if the users are inb infinite mode, increase number of rounds!
    if mode == "infinite":
        num_rounds += 1


# Game loop ends here

# Game History / Statistics area