import random

# Check that users have entered a valid answer
# option based on 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 entre something that is valid
        print(error)
        print()

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

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

To begin, choose the number of rounds (you can play between 5 and 20 rounds)

Then answer the multiplication question. Give it your best go! 
Your results will be published at the end of the game. 

Press <xxx> to end game at anytime

Good Luck!
    """)

# checks for an integer between 5 and 20
def int_checker(question):
    while True:
        error = "Please enter an integer that between 5 and 20."

        to_check = input(question)

        try:
            response = int(to_check)

            # checks that the number is more than / equal to 1
            if response < 5 or response > 20:
                print(error)
            else:
                return response

        except ValueError:
            print(error)

# Checks for an integer more than 0
def int_equation_checker(question):
    while True:
        error = "Please enter an integer that is one or more"

        to_check = input(question)

        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)

# Checks if answer is correct / incorrect
def answer_checker():

    # Checks if answer is correct
    if user_answer == first_number * second_number:
        round_result = "correct"

    else:
        round_result = "incorrect"

    return round_result

while True:

    # Main Routine Starts here

    # Initialise game variables
    mode = "regular"

    rounds_played = 0
    answers_correct = 0
    answers_incorrect = 0

    game_history = []

    # Game heading
    print("\n🔢✏️✖️ Welcome to the multiplication quiz! ✖️✏️🔢")
    print()

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

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

    # Ask user for a number of rounds / infinite mode
    num_rounds = int_checker("How many rounds would you like to play (between 5 and 20)? ")

    # Game loop starts here
    while rounds_played < num_rounds:

        first_number = random.randint(3, 12)
        second_number = random.randint(3, 12)

        # Rounds headings
        rounds_heading = f"\n Round {rounds_played + 1} of {num_rounds} "
        print(rounds_heading)

        # Asks multiplication question
        user_answer = int_equation_checker(f"Question: {first_number} x {second_number} = ")
        print(f"You choose, {user_answer}")

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

        result = answer_checker()

        # Identifies the correct answer
        correct_answer = first_number * second_number

        # Display if answer is correct / incorrect and add results to game history
        if result == "correct":
            answers_correct += 1
            feedback ="✅✅✅ Congratulations, that is the correct answer ✅✅✅"

        else:
            answers_incorrect += 1
            feedback = (f"❌❌❌ Sorry, that was an incorrect answer ❌❌❌. "
                        f"\033[1mThe correct answer is {correct_answer} \033[0m")

        print(feedback)

        round_feedback = f"{first_number} x {second_number} = {user_answer}, {feedback}"
        history_item = f"Round: {rounds_played +1} - {round_feedback}"

        game_history.append(history_item)

        rounds_played += 1

    # Game loop ends here

    # Game history / Statistics area

    # Calculate percentage of correct answers
    percentage_correct = answers_correct / rounds_played * 100

    # Output game statistics
    print("\n📊📊📊 Game Statistics 📊📊📊")
    print(f"✅ Correct answers: {answers_correct} \t "
          f"❌ Incorrect answers: {answers_incorrect} \t "
          f"👍 Percentage correct: {percentage_correct:.2f}%")

    # Ask if user wants game history, if yes display history
    print()
    history = string_checker("Do you want to see your game history? ")

    if history == "yes":
        for item in game_history:
            print(item)

    print()
    restart_game = string_checker("Would you like to play again? ")
    if restart_game == "yes":
        continue
    else:
        break

print("Thanks for playing!")