#!/usr/bin/env python3
"""Script for Tkinter GUI chat client."""
from socket import AF_INET, socket, SOCK_STREAM
from threading import Thread
import tkinter

def receive():
    """Handles receiving of messages."""
    while True:
        try:
            msg = client_socket.recv(BUFSIZ).decode("utf8")
            msg_list.insert(tkinter.END, msg)
        except OSError:  # Possibly client has left the chat.
            break


def send(event=None):  # event is passed by binders.
    """Handles sending of messages."""
    msg = my_msg.get()
    my_msg.set("")  # Clears input field.
    client_socket.send(bytes(msg, "utf8"))
    if msg == "{quit}":
        client_socket.close()
        top.quit()


def on_closing(event=None):
    """This function is to be called when the window is closed."""
    my_msg.set("{quit}")
    send()

def start_messenger(event=None):
    messengerstart_button.pack_forget()
    background_label.pack_forget()
    
    scrollbar.pack(side=tkinter.RIGHT, fill=tkinter.Y)
    msg_list.pack(side=tkinter.LEFT)
    msg_list.pack()
    messages_frame.pack()
    entry_field.pack(fill=tkinter.X)
    send_button.pack(fill=tkinter.X)
    

top = tkinter.Tk()
top.title("Brieftaube")
#top.attributes('-fullscreen', True)
top["bg"]="red3"
#canvas = tkinter.Canvas(top, 
           #width=300, 
           #height=300)
#canvas.pack(side=tkinter.BOTTOM, fill=tkinter.BOTH)
img = tkinter.PhotoImage(file="Smiley.ppm")
#canvas.create_image(200,200, image=img)

background_label = tkinter.Label(top, image=img)
background_label.place(x=0, y=0, relwidth=1, relheight=1)
#background_label["bg"] = "black"
background_label.pack()

messengerstart_button = tkinter.Button(top, text="Start", command=start_messenger, activebackground="red3", bg="black", fg="red3", font="C059")
messengerstart_button.pack(fill=tkinter.X)




messages_frame = tkinter.Frame(top)
my_msg = tkinter.StringVar()  # For the messages to be sent.
my_msg.set("")
scrollbar = tkinter.Scrollbar(messages_frame, activebackground="red3", bg="black")  # To navigate through past messages.
# Following will contain the messages.
msg_list = tkinter.Listbox(messages_frame, background="black", fg="red3", height=20, width=50, yscrollcommand=scrollbar.set)
#canvas.pack()

entry_field = tkinter.Entry(top, textvariable=my_msg, bg="black", fg="red3")
entry_field.bind("<Return>", send)
send_button = tkinter.Button(top, text="SEND", command=send, activebackground="red3", bg="black", fg="red3", font="C059")








top.protocol("WM_DELETE_WINDOW", on_closing)


#----Now comes the sockets part----
HOST = input('Enter host: ')
PORT = input('Enter port: ')
if not PORT:
    PORT = 33000
else:
    PORT = int(PORT)

BUFSIZ = 1024
ADDR = (HOST, PORT)

client_socket = socket(AF_INET, SOCK_STREAM)
client_socket.connect(ADDR)

receive_thread = Thread(target=receive)
receive_thread.start()


tkinter.mainloop() # Starts GUI execution.