from tkinter import*
import os

def register():
    global rscreen
    rscreen=Toplevel(root)
    rscreen.geometry("300x250")
    rscreen.title("Register")
    global firstname
    global lastname
    global username
    global password
    global firstname_entry
    global lastname_entry
    global username_entry
    global password_entry
    firstname=StringVar()
    lastname=StringVar()
    username=StringVar()
    password=StringVar()
    Label(rscreen,text="kindly enter the required details").pack()
    Label(rscreen,text=" ").pack()
    Label(rscreen,text="FirstName").pack()
    Label(rscreen,text=" ").pack()
    firstname_entry=Entry(rscreen,textvariable=firstname).pack()
    Label(rscreen,text="LastName").pack()
    Label(rscreen,text=" ").pack()
    lastname_entry=Entry(rscreen,textvariable=lastname).pack()
    Label(rscreen,text="Username").pack()
    Label(rscreen,text=" ").pack()
    username_entry=Entry(rscreen,textvariable=username).pack()
    Label(rscreen,text="Password *").pack()
    Label(rscreen,text=" ").pack()
    password_entry=Entry(rscreen,textvariable=password).pack()
    Label(rscreen,text=" ").pack()
    Button(rscreen,text="Register",command=register_user).pack()
def login():
    global lscreen
    lscreen=Toplevel(root)
    lscreen.geometry("300x250")
    lscreen.title("Login Page")
    global username_ver
    global password_ver
    username_ver=StringVar()
    password_ver=StringVar()
    Label(lscreen,text="Login to your account").pack()
    Label(lscreen,text=" ").pack()
    Label(lscreen,text="Username").pack()
    Label(lscreen,text=" ").pack()
    Entry(lscreen,textvariable=username_ver).pack()
    Label(lscreen,text="Password").pack()
    Label(lscreen,text=" ").pack()
    Entry(lscreen,textvariable=password_ver).pack()
    Label(lscreen,text=" ").pack()
    Button(lscreen,text="Login",command=login_ver).pack()
def register_user():
    username_info = username.get()
    password_info = password.get()

    fp = open('userinfo.txt', "w")
    fp.write(username_info + "\n")
    fp.write(password_info)
    fp.close()

    Label(rscreen, text="Registration Success").pack()
def login_ver():
    username1=username_ver.get()
    password1=password_ver.get()
    list_files=os.listdir()
    if 'userinfo.txt' in list_files:
        fp = open('userinfo.txt',"r")
        verify=fp.read().splitlines()
        if username1 in verify and password1 in verify:
            success()
        else:
            password_error()
    else:
        user_not_found()
def success():
    global screen
    screen=Toplevel(lscreen)
    screen.geometry("300x250")
    screen.title("success")
    Label(screen,text="Logged in successfully").pack()
    Button(screen,text="CONFIRM",command=close_success).pack()
def close_success():
    screen.destroy()
def password_error():
    global pscreen
    pscreen=Toplevel(lscreen)
    pscreen.geometry("300x250")
    pscreen.title("password error")
    Label(pscreen,text="Invalid login").pack()
    Button(pscreen,text="CONFIRM",command=close_password_error).pack()
def close_password_error():
    pscreen.destroy()
def user_not_found():
    global uscreen
    uscreen=Toplevel(lscreen)
    uscreen.geometry("300x250")
    uscreen.title("error")
    Label(uscreen,text="User not found").pack()
    Button(uscreen,text="CONFIRM",command=close_user_not_found).pack()
def close_user_not_found():
    uscreen.destroy()
def main_act():
    global root
    root=Tk()
    root.geometry("300x250")
    root.title("Login and register page")
    Label(root,text="Login or register").pack()
    Label(root,text=" ").pack()
    Button(root,text="Login",command=login).pack()
    Label(root,text=" ").pack()
    Button(root,text="Register",command=register).pack()
    Label(root,text=" ").pack()
    root.mainloop()
main_act()