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"]
easy_difficulty = ["+", "-"]
medium_difficulty = ["x", "÷", "+", "-"]
hard_difficulty = ["x", "÷"]
game_history = []
rounds_played = 0
rounds_won = 0
rounds_lost = 0

print()
print("Maths Quiz")
print()

# asks user for number of rounds they want
rounds = int_check(f"How many rounds do you want? (3 to 10): ", 3, 10)

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

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

    # picks 'easy', 'medium' or 'hard' based on user input
    # then chooses what the numbers are and then if its '+', '-', or 'x'
    # based on the difficulty
    if rounds_difficulty == "easy":

        num1 = random.randint(1, 10)
        num2 = random.randint(1, 10)

        round_variable = random.choice(easy_difficulty)

        if round_variable == "-":
            if num1 > num2:
                answer = num1 - num2
                rounded_num = answer
            else:
                answer = num2 - num1
                rounded_num = answer
        else:
            answer = num1 + num2
            rounded_num = answer
    elif rounds_difficulty == "medium":

        num1 = random.randint(4, 12)
        num2 = random.randint(4, 12)

        round_variable = random.choice(medium_difficulty)

        if round_variable == "x":
            answer = num1 * num2
            rounded_num = answer
        elif round_variable == "-":
            if num1 > num2:
                answer = num1 - num2
                rounded_num = answer
            else:
                answer = num2 - num1
                rounded_num = answer
        elif round_variable == "+":
            answer = num1 + num2
            rounded_num = answer
        else:
            num1 = random.randint(3, 12) * 2
            num2 = random.randint(1, 3) * 2
            answer = num1 / num2
            rounded_num = round(answer, 2)

    else:
        num1 = random.randint(6, 15)
        num2 = random.randint(6, 15)
        round_variable = random.choice(hard_difficulty)

        if round_variable == "x":
            answer = num1 * num2
            rounded_num = answer
        else:
            num1 = random.randint(3, 7) * 2
            num2 = random.randint(1, 3) * 2
            answer = num1 / num2
            rounded_num = round(answer, 2)

    # asks user question with the high number displayed first and low number last
    if num1 > num2:
        print(f"Round {rounds_played + 1} of {rounds} rounds")
        user_answer = int_check(f"What is {num1} {round_variable} {num2}? ", 0, 500)
    else:
        print(f"Round {rounds_played + 1} of {rounds} rounds")
        user_answer = int_check(f"What is {num2} {round_variable} {num1}? ", 0, 500)

    if rounded_num == 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 {rounded_num} ❌"
        print(result_display)
        print()
    if num1 > num2:
        history_item = f"Round {rounds_played + 1}: {num1} {round_variable} {num2} = {user_answer} - {result_display}"
    else:
        history_item = f"Round {rounds_played + 1}: {num2} {round_variable} {num1} = {user_answer} - {result_display}"
    game_history.append(history_item)
    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 Statistics")
    print(f"Won: {percent_won:.2f}%\t "
          f"Lost: {percent_lost:.2f}%\t ")

    # ask user if they want to see their game history and output if requested.
    see_history = string_checker("\nDo you want to see your game history? (yes / no): ")
    if see_history == "yes":
        for item in game_history:
            print(item)

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

print("The program has ended")