3/1

import tkinter
import datetime
import serial
import threading

ser = serial.Serial("COM4", 9600)


def receive(serial):
    while True:
        try:
            ser_bytes = serial.readline()
            data = ser_bytes[0: len(ser_bytes) - 1].decode("utf-8")
            time = str(datetime.datetime.now().replace(microsecond=0))
            msg_list.insert(tkinter.END, "[" + time + "] " + data)

        except OSError:
            break


def send(event=None):
    msg = my_msg.get()
    nickname = nick_field.get()
    my_msg.set("")
    msg = nickname + ": " + msg

    time = str(datetime.datetime.now().replace(microsecond=0))

    if nickname != "Enter your username here" and nickname != "":
        ser.write(msg.encode())
        msg_list.insert(tkinter.END, "[" + time + "] " + msg)
    else:
        msg_list.insert(tkinter.END, "Please enter your nickname first")


top = tkinter.Tk()
top.title("Chat")
top.resizable(False, False)
messages_frame = tkinter.Frame(top)
my_msg = tkinter.StringVar()
my_msg.set("")

scrollbarY = tkinter.Scrollbar(messages_frame)
scrollbarX = tkinter.Scrollbar(messages_frame, orient='horizontal')

msg_list = tkinter.Listbox(messages_frame, height=15, width=50, yscrollcommand=scrollbarY.set, xscrollcommand=scrollbarX.set)

scrollbarY.config(command=msg_list.yview)
scrollbarY.pack(side=tkinter.RIGHT, fill=tkinter.Y)

scrollbarX.config(command=msg_list.xview)
scrollbarX.pack(side=tkinter.BOTTOM, fill=tkinter.X)

msg_list.pack()


nick_field = tkinter.Entry()
nick_field.insert(0, 'Enter your username here')
nick_field.bind("<FocusIn>", lambda args: nick_field.delete('0', 'end'))
nick_field.pack(fill=tkinter.BOTH)

messages_frame.pack()

entry_field = tkinter.Entry(top, textvariable=my_msg)
entry_field.insert(0, 'Enter your message here')
entry_field.bind("<Return>", send)
entry_field.bind("<FocusIn>", lambda args: entry_field.delete('0', 'end'))
entry_field.pack()
send_button = tkinter.Button(top, text="Send", command=send)
send_button.pack()

thread = threading.Thread(target=receive, args=(ser,))
thread.start()
tkinter.mainloop()