import random


def string_checker(question, valid_ans=("yes", "no")):
    error = f"Please enter a valid option from the following list: {valid_ans}"

    while True:
        user_response = input(question).strip().lower()

        if not user_response:
            print(error + "\n")
            continue

        for item in valid_ans:
            if user_response == item or user_response == item[0]:
                return item

        print(error + "\n")


def instruction():
    print("""
~~~ 𝐐𝐮𝐢𝐳 𝐈𝐧𝐬𝐭𝐫𝐮𝐜𝐭𝐢𝐨𝐧𝐬 ~~~

~~ How to Play:
- Select the total number of questions you want to play (up to 100).
- A problem will appear on your screen each turn. Type your numeric answer and hit Enter.
- You'll immediately see if your response was right or wrong.
- Need to leave early? Type <xxx> at any prompt to quit the game instantly.

Good luck!
""")


# --- Main Program ---

score = 0
answer_check = ["yes", "no"]

# Check if user wants instructions
want_instruction = string_checker("Do you want to see the instructions? ", answer_check)
if want_instruction == "yes":
    instruction()

# Ask for rounds with a boundary limit of 100
rounds_input = input("\nHow many rounds would you like to play (1-100)? ").strip().lower()

# Loop until input is a digit AND falls within the 1-100 boundary limit
while not rounds_input.isdigit() or not (1 <= int(rounds_input) <= 100):
    print("⚠️ Please enter a valid number between 1 and 100. ⚠️")
    rounds_input = input("How many rounds would you like to play (1-100)? ").strip().lower()

total_rounds = int(rounds_input)
question_num = 1

# Game Loop
while question_num <= total_rounds:
    print(f"\n~~~ Question {question_num} of {total_rounds} ~~~")

    random_1 = random.randint(2, 15)
    random_2 = random.randint(2, 15)
    ans = random_1 * random_2

    print(f"What is {random_1} x {random_2}?")
    user_input = input("Please enter your answer here or type 'xxx' to quit: ").strip().lower()

    if user_input == "xxx":
        print("\nThe game ended early.")
        break

    try:
        user_ans = int(user_input)
        if user_ans == ans:
            print("You got it!")
            score += 1
        else:
            print(f"Incorrect. The correct answer was {ans}")
    except ValueError:
        print(f"Invalid input (skipped). The correct answer was {ans}")

    # Always increment round count after each question turn
    question_num += 1

# Final Results
rounds_played = question_num - 1

print("\n=========================")
print("Quiz Finished")
print(f"Your final score is {score}/{rounds_played}")
print("=========================")