import random

# Functions
def statement_generator(statement, decoration, amount):
    """Adds additional characters to the start and end of headings as decoration"""
    print(f"\n{decoration * amount} {statement} {decoration * amount}")

def int_check(question, low=None, high=None, exit_code=None):
    """Checks users enter an integer within optional bounds"""
    if low is None and high is None:
        error = "Please enter an integer"
    elif low is not None and high is None:
        error = f"Please enter an integer that is more than / equal to {low}"
    else:
        error = f"Please enter an integer that is between {low} and {high} (inclusive)"

    while True:
        response = input(question).lower()

        if response == exit_code:
            return response
        try:
            response = int(response)
            if low is not None and response < low:
                print(error)
            elif high is not None and response > high:
                print(error)
            else:
                return response
        except ValueError:
            print(error)

def string_checker(question, valid_ans=('yes', 'no')):
    """Check that users have entered a valid option based on a list"""
    error = f"Please enter one of the following: {valid_ans}"
    while True:
        user_response = input(question).lower()
        for ans in valid_ans:
            if ans == user_response or user_response == ans[0]:
                return ans
        print(error)
        print()

def instructions():
    """Prints instructions"""
    statement_generator("Instructions", "*", 3)
    print("""
Choose how many rounds you want to play (or press <enter> for infinite).
Solve each math question as best as you can.
Try to get as many correct as possible!
Good luck!
""")

# Game Setup
game_mode = "regular"
rounds_played = 0
questions_right = 0
questions_wrong = 0
quiz_history = []
statistics = []
operations = ["+", "-", "*", "/"]

# Main Routine
statement_generator("Basic Math Quiz", "❓", 3)
want_instructions = string_checker("Would you like to view the instructions? ")

if want_instructions == "yes":
    instructions()

rounds = int_check("\nHow many questions would you like? (Press <enter> for infinite) ", low=1, exit_code="")
if rounds == "":
    game_mode = "infinite"
    rounds = 1

# Quiz Loop
while rounds_played < rounds:
    statement_generator(f"Question {rounds_played + 1}", "*", 3)

    operation = random.choice(operations)

    if operation != "/":
        num1 = random.randint(1, 20)
        num2 = random.randint(1, 20)
    else:
        num2 = random.randint(1, 10)
        result = random.randint(1, 10)
        num1 = result * num2  # ensures clean division

    expression = f"{num1} {operation} {num2}"
    answer = int(eval(expression))

    user_guess = int_check(f"{expression} = ", low=None, high=None, exit_code="xxx")

    if user_guess == "xxx":
        break

    if int(user_guess) == answer:
        statement_generator("Correct!", "✅", 2)
        questions_right += 1
        statistics.append(1)
    else:
        statement_generator(f"Incorrect! The correct answer was {answer}.", "❌", 2)
        questions_wrong += 1
        statistics.append(0)

    quiz_history.append(f"Q{rounds_played + 1}: {expression} = {answer} | Your Answer: {user_guess}")
    rounds_played += 1
    if game_mode == "infinite":
        rounds += 1

# Game Over or Finished
if rounds_played > 0:
    percentage = round((sum(statistics) / len(statistics)) * 100)
    statement_generator("Quiz Complete!", "🎉", 3)
    statement_generator("Statistics", "📊", 3)
    print(f"Correct: {questions_right} | Incorrect: {questions_wrong} | Accuracy: {percentage}%\n")

    see_history = string_checker("Would you like to see your quiz history? ")
    if see_history == "yes":
        for item in quiz_history:
            print(item)
else:
    print("You quit before answering any questions. 🐔")