from tkinter import *
import shelve
from time import sleep

class Login():


    def __init__(self):
        self.graph = Tk()
        self.graph.geometry("250x200")
        self.graph.title("Login")
        self.data = shelve.open('login')


    def create_frame(self):
        self.frame_user = Frame(self.graph, pady=4)
        self.frame_passwd = Frame(self.graph, pady=4)
        self.entry_user = Frame(self.graph, pady=4)
        self.entry_passwd = Frame(self.graph, pady=4)
        self.frame_button = Frame(self.graph, pady=22)


    def pack_frame(self):
        self.frame_user.pack()
        self.entry_user.pack()
        self.frame_passwd.pack()
        self.entry_passwd.pack()
        self.frame_button.pack()


    def user(self):
        self.text_user = Label(self.frame_user, text="Usuario")
        self.text_user.pack()

        self.user = Entry(self.entry_user)
        self.user.pack()


    def passwd(self):
        self.text_pass = Label(self.frame_passwd, text="Senha")
        self.text_pass.pack()

        self.passwd = Entry(self.entry_passwd)
        self.passwd.pack()


    def button(self):
        self.button = Button(self.frame_button,
                    text = "Enviar", command = self.check)
        self.button.pack(side= RIGHT)

        self.button_register = Button(self.frame_button,
                    text = "Registrar", command = self.register)
        self.button_register.pack(side = LEFT)

        self.text_ = Label(self.graph, text="")
        self.text_.pack()


    def register(self):
        self.text_user['fg'] = 'green'
        self.text_pass['fg'] = 'green'

        self.button_register['text'] = 'Criar'
        self.button_register['command'] = self.new_account


    def new_account(self):
        if (not self.user.get() in self.data):
            self.data[self.user.get()] = self.passwd.get()
            self.text_['text'] = 'Conta criada'


    def check(self):
        if (self.user.get() in self.data and
                    self.data[self.user.get()] == self.passwd.get()):
            self.text_['text'] = 'Login valido'
            self.text_['fg'] = 'green'
        else:
            self.text_['text'] = 'Login invalido'
            self.text_['fg'] = 'red'


    def loop(self):
        self.graph.mainloop()


teste = Login()
teste.create_frame()
teste.pack_frame()
teste.user()
teste.passwd()
teste.button()
teste.loop()