from tkinter import *
from tkinter import messagebox
import os
import time

forbidden_chars = "\/:*<>|"


def verify():
    if os.path.isdir("./"+u_name.get()):
        if os.path.isfile("./"+u_name.get()+"/password.txt"):
            file = open("./"+u_name.get()+"/password.txt", "r")
            if file.read() == pass_var.get():
                def english():
                    window = Tk()
                    window.title("EN")
                    window.resizable(0, 0)

                    # program (english)

                    window.mainloop()

                def italian():
                    window = Tk()
                    window.title("IT")
                    window.resizable(0, 0)

                    # program (italian)

                    window.mainloop()

                login.destroy()

                # select language
                root = Tk()
                root.title("ROOT")
                root.resizable(0, 0)

                label = Label(text="Select a language")
                label.grid(column="1", row="1")

                language = Menu()
                language.insert_command(index=language, label="English", command=lambda: english())
                language.insert_command(index=language, label="Italian", command=lambda: italian())
                language.grid(column="1", row="2")

                root.mainloop()
            else:
                messagebox.showerror(title="FATAL ERROR", message="Wrong password")
        else:
            messagebox.showerror(title="FATAL ERROR", message="Password not found")
    else:
        messagebox.showerror(title="FATAL ERROR", message="User not found")


def register():
    if username.get() != "":
        if password.get() != "":
            if username.get().find(forbidden_chars) or password.get().find(forbidden_chars):
                if not os.path.exists(username.get()):
                    os.makedirs(username.get())
                    file = open("./" + username.get() + "/password.txt", "w")
                    file.write(password.get())
                    file.close()
                    time.sleep(2)
                else:
                    messagebox.showerror(title="FATAL ERROR", message="This username already exists!")
            else:
                messagebox.showerror(title="FATAL ERROR", message="You can't type these characters on username:\n"
                                                                  "\ / : * < > |")
        else:
            messagebox.showerror(title="FATAL ERROR", message="Password can't be empty")
    else:
        messagebox.showerror(title="FATAL ERROR", message="Username can't be empty")


# login
login = Tk()
login.title("Login")
login.resizable(0, 0)

Label1 = Label(text="Username: ")
Label1.grid(column="1", row="1")

u_name = StringVar(value="")
username = Entry(login, textvariable=u_name)
username.grid(column="2", row="1")

Label2 = Label(text="Password: ")
Label2.grid(column="1", row="2")

pass_var = StringVar(value="")
password = Entry(login, textvariable=pass_var, show="*")
password.grid(column="2", row="2")

info_label = Label(text="NOTE: you can't type these\n characters on username:\n \ / : * < > |", fg="gray")
info_label.grid(column="1", columnspan="2", row="3")

loginButton = Button(text="Login", command=lambda: verify())
loginButton.grid(column="1", sticky="e", row="4")

sign_inButton = Button(text="Sign in", command=lambda: register())
sign_inButton.grid(column="2", sticky="w", row="4")

login.mainloop()