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()


# 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_won = 0
rounds_lost = 0

# program showed to the user starts here
print()
print("Maths quiz")
print()

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

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

# asks user for what difficulty they want
rounds_diff = string_checker("What difficulty do you want? (Easy (e), Medium (m), or Hard (h): ", difficulty_list)
print(f"You chose {rounds_diff}")
print()

# questions for the user starts here and loops until 'round_played' match 'rounds'
# in other words, keeps repeating until the users chosen number of rounds are done
while rounds_played < rounds:

    if rounds_diff == "easy":
        low_number = 1
        high_number = 10

    elif rounds_diff == "medium":
        low_number = 4
        high_number = 12

    else:
        low_number = 6
        high_number = 15

    low_number_range = low_number * low_number
    high_number_range = high_number * high_number

    num1 = random.randint(low_number, high_number)
    num2 = random.randint(low_number, high_number)

    low_number = num1

    answer = num1 * num2

    # tells user what round they are on out of the rounds they picked
    # then asks user question
    print(f"Round {rounds_played + 1} of {rounds} rounds")
    user_answer = int_check(f"What is {num1} x {num2}? ", low_number_range, high_number_range)

    if answer == user_answer:
        rounds_won += 1
        result_display = "Woohoo! correct answer"
        print(result_display)
        print()
    else:
        rounds_lost += 1
        result_display = f"Incorrect, The correct answer was {answer} "
        print(result_display)
        print()

    rounds_played += 1

if rounds_played > 0:

    # calculate statistics
    percent_won = rounds_won / rounds_played * 100
    percent_lost = rounds_lost / rounds_played * 100

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

    # end of program
    print()
    print("Thanks for playing!")

print("The program has ended")