import random


# check hat 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 res[onse 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()


# 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 13
            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 puts in the right answer

    if user == [answer]:
        round_result = "win"

    # user puts in a wrong answer
    else:
        round_result = "loss"

    return round_result


# Main routine starts here

# intialise game variables
mode = "regular"

rounds_played = 0
rounds_won = 0
rounds_lost = 0

rps_list = ["1", "2", "3", "4", "5", "xxx"]
game_history = []

# questions the comp can ask you
question_list = [

    "What is 1 + 2?",
    "What is 2 + 2?",
    "What is 2 - 1?",
    "What is 1 + 1?",
    "What is 2 + 3?"
]

print(" Maths quiz  ")
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? ")

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

    *** Instructions ****

    To begin, choose the number of rounds (must be from 3
    to 20).

    Then be asked maths questions that you must answer
    correctly

    Press <xxx> to end the game at anytime.

    Good Luck!
        ''')

# ask user for number of rounds
num_rounds = int_check("How many Rounds would you like to play?: ")

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

# game loop starts here
while rounds_played < num_rounds:

    # rounds headings
    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(question_list)
    print(f"{comp_choice}")

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

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

    result = rps_compare(user_choice, comp_choice)

    # adjust game lost / game tried counters add results to the game history
    if result == "win":
        feedback = "Correct!"
        rounds_won += 1
        rounds_played += 1
    else:
        feedback = "Incorrect."
        rounds_lost += 1
        rounds_played += 1

    # set up round feedback and output it user.
    # add it to the game history list (include the round number)
    round_feedback = f"{user_choice} vs {comp_choice}, {feedback}"
    history_item = f"Round: {rounds_played + 1} - {round_feedback}"

    print(round_feedback)
    game_history.append(history_item)

    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

if rounds_played > 0:
    # calculate statistics
    percent_won = rounds_won / rounds_played * 100
    percent_lost = rounds_lost / rounds_played * 100
    percent_tied = 100 - percent_won - percent_lost

    # output game statistics
    print("Game Statistices")
    print(f"Won: {percent_won:.2f} \t "
          f"Lost: {percent_lost:.2f} \t "
          f"Tied: {percent_tied:.2f}")

    # ask user if they want to see their game history and output if requested.
    see_history = string_checker("\nDo you want to see your game history? ")
    if see_history == "yes":
        for item in game_history:
            print(item)

    print()
    print("Thanks for playing.")

# this will be given to user if they don't play any rounds
else:
    print("Oops - You chickened out!")