## Hey there. This is a password and login system that I have tried to create. However, I have a slight issue that I could use some
## help on. Line 150, there is a section of code that attempts to destroy a label that is produced when a user inputs a username
## that has already been used. However, I get an error stating that NoneType object has no attribute to after, and I was wondering
## if there is another way to show the label on Line 149, keep it there for the user to see (say like 2 seconds), and then destroy it.


import tkinter as tk
from tkinter import *
import time
import os

## Acts for all buttons with command HoverButton, changes the color when hovering

class HoverButton(tk.Button):
    def __init__(self, master, **kw):
        tk.Button.__init__(self,master=master,**kw)
        self.defaultBackground = self["background"]
        self.bind("<Enter>", self.on_enter)
        self.bind("<Leave>", self.on_leave)

    def on_enter(self, e):
        self['background'] = self['activebackground']

    def on_leave(self, e):
        self['background'] = self.defaultBackground


## Callable procedure of the register page

def register():

    global register_screen

    register_screen = Toplevel(main)
    register_screen.geometry("400x250")
    register_screen.title("Register")

    global username
    global password
    global username_entry
    global password_entry

    username = StringVar()
    password = StringVar()

    Label(register_screen, text = " Please enter details below", font = "Bahnschrift", width = "400", bg = "light grey").pack()
    Label(register_screen, text = "").pack()

    username_label = Label(register_screen, text = "Username", font = "Bahnschrift").pack()
    username_entry = Entry(register_screen, textvariable = username)
    username_entry.pack()

    password_label = Label(register_screen, text = "Password", font = "Bahnschrift").pack()
    password_entry = Entry(register_screen, textvariable = password, show = "*")
    password_entry.pack()

    Label(register_screen, text = "").pack()

    HoverButton(register_screen, text = "Confirm", font = "Bahnschrift", activebackground = "light grey", command = file_add, width = "10", height = "2").place(x = "100", y = "190")
    HoverButton(register_screen, text = "Exit", font = "Bahnschrift", activebackground = "light grey", command = register_screen.destroy, width = "10", height = "2").place(x = "210", y = "190")


## Callable procedure for the login page

def login():

    global login_screen

    login_screen = Toplevel(main)
    login_screen.title("Login")
    login_screen.geometry("400x250")

    Label(login_screen, text = "Please enter login details below", font = "Bahnschrift", width = "400").pack()
    Label(login_screen, text = "").pack()

    global username_verify
    global password_verify

    username_verify = StringVar()
    password_verify = StringVar()

    global username_login_entry
    global password_login_entry

    Label(login_screen, text = "Username", font = "Bahnschrift").pack()
    username_login_entry = Entry(login_screen, textvariable = username_verify)
    username_login_entry.pack()

    Label(login_screen, text = "").pack()

    Label(login_screen, text = "Password", font = "Bahnschrift").pack()
    password_login_entry = Entry(login_screen, textvariable = password_verify, show = "*")
    password_login_entry.pack()

    HoverButton(login_screen, text = "Confirm", font = "Bahnschrift", activebackground = "light grey", width = "10", height = "2", command = login_verify).place(x = "100", y = "190")
    HoverButton(login_screen, text = "Exit", font = "Bahnschrift", activebackground = "light grey", width = "10", height = "2", command = login_screen.destroy).place(x = "210", y = "190")


## Verifiction of the login

def login_verify():

    username1 = username_verify.get()
    password1 = password_verify.get()

    username_login_entry.delete(0, END)
    password_login_entry.delete(0, END)

    list_files1 = os.listdir()

    if username1 in list_files1:
        file1 = open(username1, "r")
        verify = file1.read().splitlines()

        if password1 in verify[1]:
            login_success()

        else:
            password_not_correct()

    else:
        user_not_found()


## This will bring the user to the main.py game

def login_success():

#########################################################################
    print("Success")
    login_screen.destroy


## Will run if the username is correct but the password is wrong

def password_not_correct():

    user_not_found()
## If the user is not found, they are asked to login again

def user_not_found():

    Label(login_screen, text = "Please try again \n Username or Password is wrong").pack()

## Adding the username and password to the external file from (def register)

def file_add():

    username_add = username.get()
    password_add = password.get()
    if username_add in os.listdir():
        username_multiple = Label(register_screen, text = "Username already been chosen", font = "Bahnschrift").pack()
        username_multiple.after(1000, lambda: username_multiple.destroy())

        username_entry.delete(0,END)
        password_entry.delete(0,END)


    else:
        file = open(username_add, "a")
        file.write(username_add + "\n")
        file.write(password_add + "\n")
        file.close()

        username_entry.delete(0,END)
        password_entry.delete(0,END)

        Label(register_screen, text = "Success").pack()

        register_screen.after(1500, lambda: register_screen.destroy())


## Initiates the tkinter program and sets the dimensions of the main screen

def main_screen():
    global main

    main = Tk()
    main.title("Home")
    main.geometry("400x250")


    ## Blue bar across the top
    Label(main, text = "Welcome to My Cup Of Tea \n Choose whether to Register or Login", font = "Bahnschrift", width = "400",  bg = "grey").pack()
    Label(main, text = "", bg = "light grey", width = "57", height = "0").pack()
    Label(main, text = "", bg = "light grey", width = "12", height = "15").place(x="0", y="55")
    Label(main, text = "", bg = "light grey", width = "12", height = "15").place(x="310", y="55")

    ## Register and Login Buttons
    HoverButton(main, text = "Register", font = "Bahnschrift", activebackground = "light grey", command = register, width = "30", height = "2").pack()
    Label(main, text = "", width = "31", bg = "light grey").pack()

    HoverButton(main, text = "Login", font = "Bahnschrift", activebackground = "light grey", width = "30", height = "2", command = login).pack()
    Label(main, text = "", width = "31", bg = "light grey").pack()

    HoverButton(main, text = "Exit", font = "Bahnschrift", activebackground = "light grey", command = main.destroy, width = "30", height = "1").pack()
    Label(main, text = "", width = "31", height = "3", bg = "light grey").pack()

    main.mainloop()

main_screen()