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()


# Inter checker function to validate the user input is a number  and is within a number range
def int_check(question, low, high):

    error = f'Please enter a number between {low} and {high}.'

    while True:
        try:
            response = int(input(question))

            if response >= low and response <= high:
                return response
            else:
                print(error)

        except ValueError:
            print(error)


# Variables

difficulty_list = ["easy", "medium", "hard"]

rounds_played = 0

rounds = int_check(f"How many rounds do you want? (Put in number of 3 to 10) ", 3, 10)

print(f"Great you chose {rounds} rounds.")
print()

rounds_diff = string_checker("What difficulty do you want? (Easy (e), Medium (m), or Hard (h): ", difficulty_list)

while rounds_played < rounds:

    if rounds_diff == "easy":
        num1 = random.randint(1, 10)
        num2 = random.randint(1, 10)
    elif rounds_diff == "medium":
        num1 = random.randint(4, 12)
        num2 = random.randint(4, 12)
    else:
        num1 = random.randint(6, 15)
        num2 = random.randint(6, 15)

    answer = num1 * num2

    user_answer = int_check(f"What is {num1} x {num2}? ", 1, 100)

    if answer == user_answer:
        print("Woohoo! correct answer")
    else:
        print("Incorrect!")

    rounds_played += 1

print("The program has ended")