# -*- coding:utf-8 -*-
import pickle  # 存放資料的模組
import tkinter as tk
import tkinter.messagebox

window = tk.Tk()
window.title("my window")
window.geometry("450x300")

canvas = tk.Canvas(window, height=200, width=500)
image_file = tk.PhotoImage(file="welcome.gif")
image = canvas.create_image(0, 0, anchor='nw', image=image_file)
canvas.pack(side='top')

tk.Label(window, text='User name:').place(x=50, y=150)
tk.Label(window, text='Password name:').place(x=50, y=190)

var_usr_name = tk.StringVar()
var_usr_name.set('
 
[email protected]')

var_usr_pwd = tk.StringVar()

entry_usr_name = tk.Entry(window, textvariable=var_usr_name)
entry_usr_name.place(x=160, y=150)
entry_usr_pwd = tk.Entry(window, textvariable=var_usr_pwd, show='*')
entry_usr_pwd.place(x=160, y=190)


def usr_login():
    usr_name = var_usr_name.get()
    usr_pwd = var_usr_pwd.get()

    try:
        with open("usrs_info.pickle", "rb") as usr_file:
            usrs_info = pickle.load(usr_file)
    except FileNotFoundError:
        with open("usrs_info.pickle", "wb") as usr_file:  # with open with語句可以自動關閉資源
            usrs_info = {"admin": "admin"}  # 以字典的形式儲存賬戶和密碼
            pickle.dump(usrs_info, usr_file)

    if usr_name in usrs_info:
        if usr_pwd == usrs_info[usr_name]:
            tk.messagebox.showinfo(title="Welcome", message="How are you! " + usr_name)
        else:
            tk.messagebox.showerror(message="Error,your password is wrong,try again")
    else:
        is_sign_up = tk.messagebox.askyesno("Welcome", "You have not sign up yet.Sign up today?")
        if is_sign_up:
            usr_sign_up()


def usr_sign_up():
    def sign_to_Python():
        np = new_pwd.get()
        npf = new_pwd_confirm.get()
        nn = new_name.get()
        with open("usrs_info.pickle", "rb") as usr_file:
            exist_usr_info = pickle.load(usr_file)
        if np != npf:
            tk.messagebox.showerror("Error", "Password and confirm password must be the same!")
        elif nn in exist_usr_info:
            tk.messagebox.showerror("Error", "The user has already signed up! ")
        else:
            exist_usr_info[nn] = np
            with open("usrs_info.pickle", "wb") as usr_file:
                pickle.dump(exist_usr_info, usr_file)

            tk.messagebox.showinfo("Welcome", "You have successfully signed up!")
            # close window
            window_sign_up.destroy()

    window_sign_up = tk.Toplevel(window)
    window_sign_up.geometry("350x200")
    window_sign_up.title("sign up window")

    new_name = tk.StringVar()
    new_name.set("
 
[email protected]")
    tk.Label(window_sign_up, text="User name:").place(x=10, y=10)
    entry_new_name = tk.Entry(window_sign_up, textvariable=new_name)
    entry_new_name.place(x=150, y=10)

    new_pwd = tk.StringVar()
    tk.Label(window_sign_up, text="Password:").place(x=10, y=50)
    entry_usr_pwd = tk.Entry(window_sign_up, textvariable=new_pwd, show='*')
    entry_usr_pwd.place(x=150, y=50)

    new_pwd_confirm = tk.StringVar()
    tk.Label(window_sign_up, text="Confirm password:").place(x=10, y=90)
    entry_usr_pwd_confirm = tk.Entry(window_sign_up, textvariable=new_pwd_confirm, show='*')
    entry_usr_pwd_confirm.place(x=150, y=90)

    btn_confirm_sign_up = tk.Button(window_sign_up, text="Sign up", command=sign_to_Python)
    btn_confirm_sign_up.place(x=150, y=130)


# login and sign up
btn_login = tk.Button(window, text="Login", command=usr_login)
btn_login.place(x=170, y=230)

btn_sign_up = tk.Button(window, text="Sign up", command=usr_sign_up)
btn_sign_up.place(x=270, y=230)

window.mainloop()
 

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