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


# displays the instructions
def instruction():
    print('\n'
          '**** Instructions ****\n'
          '\n'
          'To begin, choose the number of rounds (or infinite rounds)\n'
          ' \n'
          'Hand Gestures:\n'
          '\n'
          'Rock: is R\n'
          'Paper: is P\n'
          'Scissors: is S\n'
          '\n'
          'Rules:\n'
          '\n'
          'Rock beats Scissors (rock crushes scissors)\n'
          'Scissors beats Paper (scissors cuts paper)\n'
          'Paper beats Rock (paper covers rock)\n'
          '\n'
          'Rock vs. Scissors: Rock wins.\n'
          'Scissors vs. Paper: Scissors wins.\n'
          'Paper vs. Rock: Paper wins.\n'
          'Same gesture: It\'s a tie; play again.\n'
          '\n')


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

        except ValueError:
            print(error)


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

# checkers users enter yes (Y) or no (N)
if want_instructions == "yes":
    instruction()


# 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 heading
    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)
    print()

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

    # exit code for any game mode
    if user_choice == "xxx":
        break

    comp_choice = random.choice(rps_list[:-1])

    rounds_played += 1

    # if users are in infinite mode, increase number of rounds.
    if mode == "infinite":
        num_rounds += 1

# Game loop ends here

# Game History / Statistics area