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", "+", "-"]
game_history = []
rounds_played = 0
rounds_won = 0
rounds_lost = 0

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

print()
print("Maths quiz")
print()

want_instructions = string_checker("Do you want to read the instructions? ")

# checks users enter yes (y) or no (n)
if want_instructions == "yes":
    print('''

    *** Instructions ****

    To begin, choose the number of rounds (or press
    infinite mode).

    Then play against the computer. You need to pick R (rock),
    P (paper) or S (scissors).

    The rules are as follows:
    - Paper beats Rock
    - Rock beats scissors
    - Scissors beats paper

    Press <xxx> to end the game at anytime.

    Good Luck!
        ''')

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}")
print()

while rounds_played < rounds:

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

        low_number_range = 0
        high_number_range = high_number * high_number

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

        round_points = random.choice(easy_difficulty)

        if round_points == "-":
            if num1 > num2:
                answer = num1 - num2
            else:
                answer = num2 - num1
        else:
            if num1 > num2:
                answer = num1 + num2
            else:
                answer = num2 + num1
    elif rounds_difficulty == "medium":
        low_number = 4
        high_number = 12

        low_number_range = 0
        high_number_range = high_number * high_number

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

        round_points = random.choice(medium_difficulty)

        if round_points == "x":
            if num1 > num2:
                answer = num1 * num2
            else:
                answer = num2 * num1
        elif round_points == "-":
            if num1 > num2:
                answer = num1 - num2
            else:
                answer = num2 - num1
        else:
            if num1 > num2:
                answer = num1 + num2
            else:
                answer = num2 + num1
    else:
        low_number = 6
        high_number = 15

        low_number_range = 0
        high_number_range = high_number * high_number

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

        if num1 > num2:
            answer = num1 * num2
        else:
            answer = num2 * num1

    if num1 > num2:
        print(f"Round {rounds_played + 1} of {rounds} rounds")
        user_answer = int_check(f"What is {num1} {round_points} {num2}? ", low_number_range, high_number_range)
    else:
        print(f"Round {rounds_played + 1} of {rounds} rounds")
        user_answer = int_check(f"What is {num2} {round_points} {num1}? ", 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()
    if num1 > num2:
        history_item = f"Round {rounds_played + 1}: {num1} {round_points} {num2} = {user_answer} - {result_display}"
    else:
        history_item = f"Round {rounds_played + 1}: {num2} {round_points} {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 Statistices")
    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")