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 on the list
            elif user_response == item[0]:
                return item

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


# Displays instructions
def instructions():
    print('''

***Instructions***

To begin, choose the number of questions. You can play between 1 and 15.

Then, answer the multiplication questions. Don't worry if you're not sure 
about an answer. Just give it a go!

Press <xxx> to end the game at anytime.

Good Luck!
    ''')


# checks for an integer more than 0
def int_check(question):
    while True:
        error = "Please enter an integer that is between 1 and 15."

        to_check = input(question)

        try:
            response = int(to_check)

            # checks that the number is between 1 and 15
            if response < 1 or response > 15:
                print(error)
            else:
                return response

        except ValueError:
            print(error)


# Main routine starts here

# Initialise game variables
mode = "regular"

questions_answered = 0
correct_answers = 0
incorrect_answers = 0

print("🤓✏️❔ Multiplication Game 🤓✏️❔")
print()

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

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

# Ask user for the number of questions
num_questions = int_check("How many questions would you like? ")

# Game loop starts here
while questions_answered < num_questions:

    number_1 = random.randint(1, 12)
    number_2 = random.randint(1, 12)

    # Rounds headings (based on mode)
    questions_heading = f"\n⏱️⏱️⏱️ question {questions_answered + 1} of {num_questions} ⏱️⏱️⏱️"

    print(questions_heading)

    # Ask user a multiplication question
    user_answer = input(f"Question: {number_1} x {number_2} = ")
    print("You answered: ", user_answer)

    # Adjust questions answered
    questions_answered += 1

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