"""An underscore at the end of a variable denotes a Boolean data type"""

import random, sys, os, time

def menu():
    password=""
    points=0
    #Valid characters for the password
    allowed="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!$%^&*()-_=+"
    try:
        choice = int(input("Welcome to my password checker/generator. Press 1 to check password, 2 to generate password, or 3 to quit. \n"))
        if choice == 1:
            password = input("Please enter a password. \n")
            if len(password) < 8 or len(password) > 24:
                print("Invalid password length.")
                menu()
            points = checkPassword(password,points,allowed)
            printStrength(points)
        elif choice == 2:
            generatePassword(password,points,allowed)
        elif choice == 3:
            print("Goodbye")
            time.sleep(2)
            sys.exit()
        else:
            raise ValueError
    except ValueError:
        print("Invalid option.")
        menu()


def checkPassword(password,points,allowed):
    top = "qwertyuiop" #Top row of keyboard
    middle = "asdfghjkl" #Middle row of keyboard
    bottom = "zxcvbnm" #Bottom row of keyboard
    upperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    lowerCase = "abcdefghijklmnopqrstuvwxyz"
    digits = "0123456789"
    symbols = "!$%^&*()-_=+"
    for letter in password:
        if letter not in allowed:
            print("Invalid character:", letter + ".")
            time.sleep(2)
            menu()
    points = score(password,top,middle,bottom,upperCase,lowerCase,digits,symbols)
    return points


def score(password,top,middle,bottom,upperCase,lowerCase,digits,symbols):
    #This section awards points for each type of character used, or removes points for duplicates of each character type.
    upper_ = False
    lowe_ = False
    digits_ = False
    symbols_ = False
    points = len(password)
    # Checks to see if the password contains uppercase or lowercase letters, symbols or digits.
    for character in password:
        if character in upperCase:
            upper_ = True
        elif character in lowerCase:
            lower_ = True
        elif character in digits:
            digits_ = True
        elif character in symbols:
            symbols_ = True
    if upper_ == True:
        points += 5
    if lower_ == True:
        points += 5
    if digits_ == True:
        points += 5
    if symbols_ == True:
        points += 5
    if upper_ and lowe_ == True and digits_ == False and symbols_ == False:
        points -= 5
    elif digits_ == True and symbols_ == False and lower_ == False and upper_ == False:
        points -= 5
    elif symbols_ == True and digits_ == False and lower_ == False and upper_ == False:
        points -= 5
    elif upper_ and lower_ and symbols_ and digits_ == True:
        points += 10
    password1 = password.lower()
    for ch in password:
        try:
            for key in top:
                if ch == key and password1[password1.index(ch)+1] == top[top.index(key)+1] and password1[password1.index(ch)+2] == top[top.index(key)+2]:
                    points -= 5
            for key in middle:
                if ch == key and password1[password1.index(ch)+1] == middle[middle.index(key)+1] and password1[password1.index(ch)+2] == middle[middle.index(key)+2]:
                    points -= 5
            for key in bottom:
                if ch == key and password1[password1.index(ch)+1] == bottom[bottom.index(key)+1] and password1[password1.index(ch)+2] == bottom[bottom.index(key)+2]:
                    points -= 5
        except IndexError:
            pass
    return points


def printStrength(points):
    if points < 0:
        print("Your password is weak, with a score of", str(points) + ".")
    elif points > 20:
        print("Your password is strong, with a score of", str(points) + ".")
    else:
        print("Your password is of medium strength, with a score of", str(points) + ".")
    time.sleep(2)
    menu()


def generatePassword(password,points,allowed):
    length = random.randint(8, 12)
    password = ""
    for x in range(length):
        character = random.randint(33, 127)
        while chr(character) not in allowed:
            character = random.randint(33, 127)
        password += chr(character)
    points = checkPassword(password,points,allowed)
    while points < 20:
        checkPassword(password,points,allowed)
    print("The password generated is", password + ". It has a strength of", str(points) + ".")
    time.sleep(2)
    os.system('cls')
    menu()


menu()