#!/usr/bin/env python3
from tkinter import *
from _thread import start_new_thread
from socket import *
from struct import *

def display_string(mtype, username):
    if(mtype == 0):
        return "Existing User:  " + username + "\n"
    if(mtype == 1):
        return "New Login:  " + username + "\n"
    if(mtype == 2):
        return "Logout:  " + username + "\n"
    print("Server is very confused this morning" + "\n")

class UsernameClient(Frame):
    def __init__(self, master):
        Frame.__init__(self, master)
        self.pack(fill='both', expand=1)
        self.textwindow = Frame(self)
        self.controls = Frame(self)
        self.controls.pack(side=RIGHT)
        self.textwindow.pack(side=LEFT, fill='both', expand=1)
        self.editor = Text(self.textwindow)
        self.editor.pack(fill='both', expand=1)
        
        self.connect_button = Button(self.controls, text="Connect", command=self.connect)
        self.connect_button.pack()
        self.change_own_text = Button(self.controls, text="Goose", command=self.change_text)
        self.change_own_text.pack()

    def change_text(self):
        self.editor.insert("end", "Goose\n")

    def receive_username(self):
        mtype, length = unpack("<BH", self.skt.recv(3))
        username = str(self.skt.recv(length).decode("utf-8"))
        return mtype, username

    def connect(self):
        # It'd be nice to let the user enter these!
        connection_address = ("isoptera.lcsc.edu", 5091)
        self.skt = socket(AF_INET, SOCK_STREAM)
        self.skt.connect(connection_address)
        start_new_thread(self.receive_users, ())

    def receive_users(self):
        while True:
            self.get_one_username()
        
    def get_one_username(self):
        mtype, username = self.receive_username()
        new_line = display_string(mtype, username) # Do we need to say self.skt?  We think no
        self.editor.insert("end", new_line)


        
root = Tk()
w,h = root.winfo_screenwidth(), root.winfo_screenheight()
root.geometry("%dx%d+0+0" % (w,h))
root.title("Username Client")
uc = UsernameClient(root)
uc.mainloop()