#Password Checker and Generator

import random

def validate_password(password):
    valid_characters = "abcdefghijklmnopqrstuvwxyz0123456789!£$%^&*()-_=+"
    print("Validate password", password)

    if len(password) >= 8 and len(password) <=24:
        for char in password:
            if char.lower() not in valid_characters:
                return False
    else:
        return False


def generate_password():
    gen_password = ""
    i = 0
    gen_characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!$%^&*()-_=+"
    password_length = random.randrange(8, 13)
    while i < password_length:
        random_value = random.choice(gen_characters)
        gen_password += random_value
        i += 1

        return gen_password

def check_password(password):
    score = len(password)
    rulematch = 0

    seqQwerty1 = "qwertyuiop"
    seqQwerty2 = "asdfghjkl"
    seqQwerty3 = "zxcvbnm"
    allsymbols = "!£$%^&*()-_=+"

    countUpper = 0
    countLower = 0
    symbolsfound = False
    countNumbers = 0

    for char in password:
        if str(char).isupper(): countUpper += 1
        if str(char).islower(): countLower += 1
        if str(char).isdigit(): countNumbers += 1
        if str(char) in allsymbols: symbolsfound = True

        if countUpper > 0:
            score += 5
            rulematch += 1
        if countLower > 0:
            score += 5
            rulematch += 1
        if countNumbers > 0:
            score += 5
            rulematch += 1
        if symbolsfound == True:
            score += 5
            rulematch += 1
        if rulematch == 4:
            score += 10


        if (countUpper > 0 or countLower > 0) and countNumbers == 0 and symbolsfound == False:
            score = score - 5

        if countNumbers > 0 and countUpper == 0 and countLower == 0 and symbolsfound == False:
            score = score + 5

        if countNumbers == 0 and countUpper == 0 and countLower == 0 and symbolsfound == True:
            score = score - 5


        for i in range(0, len(password) - 2):
            testSeg = password[i:i+3]

            if testSeg.lower() in seqQwerty1:
                score -= 5
            if testSeg.lower() in seqQwerty2:
                score -= 5
            if testSeg.lower() in seqQwerty3:
                score -= 5

        return score

#Menu starts here

print("*****************************************************")
print("* Welcome to Rowan's Password Generator and Checker *")
print("* Pick one of the following:                        *")
print("* 1) Check Password                                 *")
print("* 2) Generate Password                              *")
print("* 3) Quit the program                               *")
print("*****************************************************")
print("")

user_input = ""

while user_input != "3":
    user_input = input("Enter a number: ")

    if user_input == "1":
        print("Enter a password you want to check")
        print("Your password must be between 8 and 24 characters in length")
        print("It must also contain only alphabetic characters, digits or allowed symbols")
        print("Allowed symbols are: !£$%^&*()-_=+")
        password = input("Password: ")

        if validate_password(password) == False:
            print("Your password is invalid. Try again.")
        else:
            score = check_password(password)
            if score <= 0:
                print("Your password score is", score, "and is weak.")
            elif score <= 20:
                print("Your password score is", score, "and is medium.")
            else:
                print("Your password score is", score, "and is strong.")

    elif user_input == "2":

        score = 0
        while score <= 20:
            password = generate_password()
            score = check_password(password)
        print("The strong password generated is: ", password)
        print("The score is: ", score)

    elif user_input == "3":
        break

    else:
        print("Error! Enter 1, 2 or 3!")

print("Goodbye!")