app.py

from tkinter import *
from chat import get_response, bot_name

BG_GRAY = "#ABB2B9"
BG_COLOR = "#17202A"
TEXT_COLOR = "#EAECEE"

FONT = "Helvetica 14"
FONT_BOLD = "Helvetica 13 bold"

class ChatApplication:

	def __init__(self):
		self.window = Tk()
		self._setup_main_window()

	def run(self):
		self.window.mainloop()

	def _setup_main_window(self):
		self.window.title("Chat")
		self.window.resizable(width=False, height=False)
		self.window.configure(width=470, height=550, bg=BG_COLOR)

		# tiny label
		head_label = Label( self.window, bg=BG_COLOR, fg=TEXT_COLOR,
							text="Welcome", font=FONT_BOLD, pady=10)
		head_label.place(relwidth=1)

		# tiny divider
		line = Label(self.window, width=450, bg=BG_GRAY)
		line.place(relwidth=1, rely=0.07, relheight=0.012)

		# text widget
		self.text_widget = Text(self.window, width=20, height=2, bg=BG_COLOR,
					fg=TEXT_COLOR, font=FONT, padx=5, pady=5)
		self.text_widget.place(relheight=0.745, relwidth=1, rely=0.08)
		self.text_widget.configure(cursor="arrow", state=DISABLED)

		# scroll bar
		scrollbar = Scrollbar(self.text_widget)
		scrollbar.place(relheight=1, relx=0.97)
		scrollbar.configure(command=self.text_widget.yview)

		# bottom label
		bottom_label = Label(self.window, bg=BG_GRAY, height=80)
		bottom_label.place(relwidth=1, rely=0.825)

		# message entry box
		self.msg_entry = Entry(bottom_label, bg="#2C3E50", fg=TEXT_COLOR, font=FONT)
		self.msg_entry.place(relwidth=0.74, relheight=0.06, rely=0.008, relx=0.011)
		self.msg_entry.focus()
		self.msg_entry.bind("<Return>", self._on_enter_presses)

		# send button
		send_button = Button(bottom_label, text="Send", font=FONT_BOLD, width=20,
					bg=BG_GRAY, command=lambda: self._on_enter_pressed(None))
		send_button.place(relx=0.77, rely=0.008, relheight=0.06, relwidth=0.22)

	def _on_enter_presses(self, event):
		msg = self.msg_entry.get()
		self._insert_message(msg, "You")

	def _insert_message(self, msg, sender):
		if not msg:
			return
	
		self.msg_entry.delete(0, END)
		msg1 = f"{sender}: {msg}\n\n"
		self.text_widget.configure(state=NORMAL)
		self.text_widget.insert(END, msg1)
		self.text_widget.configure(state=DISABLED)

		msg2 = f"{bot_name}: {get_response(msg)}\n\n"
		self.text_widget.configure(state=NORMAL)
		self.text_widget.insert(END, msg2)
		self.text_widget.configure(state=DISABLED)

		self.text_widget.see(END)

if __name__ == "__main__":
	app = ChatApplication()
	app.run()