#!/usr/bin/env python3
#
# TkPyrkki v1, by nortti
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import os
import socket
import sys
import threading
import time

import tkinter
from tkinter import ttk

receiver_quit = False
class Receiver(threading.Thread):
	def __init__(self, s):
		self.s = s
		super().__init__()
		
	def run(self):
		global receiver_quit
		buffer = bytearray()
		while True:
			data = self.s.recv(1024)
			if data == b'': break
			buffer.extend(data)
			
			while b'\r\n' in buffer:
				line, _, buffer = buffer.partition(b'\r\n')
				fields = line.split(b' ')
				if len(fields) > 0 and fields[0] == b'PING':
					with sock_lock:
						self.s.sendall(b'PONG ' + b' '.join(fields[1:]) + b'\r\n')
					continue
				elif len(fields) > 1 and fields[1] == b'PRIVMSG':
					prefix, _, target, *message = fields
					msg_nick = prefix.split(b'!')[0][1:].decode(errors='replace')
					target = target.decode(errors='replace')
					if target == nick:
						target = msg_nick
					message = b' '.join(message).decode(errors='replace')[1:]
					append_message(target, msg_nick, message)
				else:
					scrollback_append(line.decode(errors='replace'))
		receiver_quit = True
					
if 'USER' in os.environ:
	username = os.environ['USER']
elif 'USERNAME' in os.environ:
	username = os.environ['USERNAME']
else:
	username = 'tkpyrkki-user'

if len(sys.argv) > 4:
	print('{} [server [port [nick]]]'.format(sys.argv[0]))
	sys.exit(1)
	
elif len(sys.argv) == 4:
	host = sys.argv[1]
	try:
		port = int(sys.argv[2])
	except ValueError:
		print('Port must be an intenger')
	nick = sys.argv[3]
	
else:
	root = tkinter.Tk()
	root.title('Connect...')
	frame = ttk.Frame(root)
	frame.grid(column=0, row=0, sticky='NSWE')
	root.columnconfigure(0, weight=1)
	root.rowconfigure(0, weight=1)
	
	host_str = tkinter.StringVar()
	host_str.set(sys.argv[1] if len(sys.argv) > 1 else 'irc.libera.chat')
	host_label = ttk.Label(frame, text='Host')
	host_label.grid(column=0, row=0, sticky='W')
	host_entry = ttk.Entry(frame, textvariable=host_str)
	host_entry.grid(column=1, row=0, sticky='WE')
	host_entry.icursor('end')
	host_entry.focus()
	
	def check_port(port):
		if port == '': return True
		try:
			port_int = int(port)
		except ValueError:
			return False
		return 0 < port_int < 1<<16
	
	port_str = tkinter.StringVar()
	port_str.set(sys.argv[2] if len(sys.argv) > 2 else '6667')
	port_label = ttk.Label(frame, text='Port')
	port_label.grid(column=0, row=1, sticky='W')
	port_entry = ttk.Entry(frame, textvariable=port_str, validate='key', validatecommand=(root.register(check_port), '%P'))
	port_entry.grid(column=1, row=1, sticky='WE')

	nick_str = tkinter.StringVar()
	nick_str.set(username) # If it's set on command line, we don't get here
	nick_label = ttk.Label(frame, text='Nick')
	nick_label.grid(column=0, row=2, sticky='W')
	nick_entry = ttk.Entry(frame, textvariable=nick_str)
	nick_entry.grid(column=1, row=2, sticky='WE')
	
	should_connect = False
	def connect_click(*_):
		global should_connect
		should_connect = True
		root.destroy()
	connect_button = ttk.Button(frame, text='Connect', command=connect_click)
	connect_button.grid(column=1, row=3, sticky='SE', pady=(2,0))
	
	frame.columnconfigure(1, weight=1)
	frame.rowconfigure(3, weight=1)
	
	root.bind('<Return>', connect_click)
	
	root.mainloop()
	
	if not should_connect:
		sys.exit(0)
		
	host = host_str.get()
	port = int(port_str.get())
	nick = nick_str.get()

root = tkinter.Tk()
root.title('TkPyrkki')
frame = ttk.Frame(root)
frame.grid(column=0, row=0, sticky='NSWE')
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

scrollback = tkinter.Text(frame, width=80, height=24, wrap='word')
scrollback.insert('1.0', 'Connecting to {}'.format(host, ':{}'.format(port) if port != 6667 else ''))
scrollback['state'] = 'disabled'
scrollback.grid(column=0, columnspan=2, row=0, sticky='NSWE')

scrollback_lock = threading.Lock()
def scrollback_append(text):
	with scrollback_lock:
		scrollback['state'] = 'normal'
		scrollback.insert('end', '\n')
		scrollback.insert('end', text)
		scrollback['state'] = 'disabled'
		scrollback.see('end')

scrollback_scroll = ttk.Scrollbar(frame, orient=tkinter.VERTICAL, command=scrollback.yview)
scrollback_scroll.grid(column=2, row=0, sticky='NS')

scrollback['yscrollcommand'] = scrollback_scroll.set

channel = tkinter.StringVar()
ttk.Label(frame, textvariable=channel).grid(column=0, row=1, sticky='W')

input_text = tkinter.StringVar()
inputline = ttk.Entry(frame, textvariable=input_text)
inputline.grid(column=1, columnspan=2, row=1, sticky='WE', pady=(2,0))
inputline.focus()

frame.columnconfigure(1, weight=1)
frame.rowconfigure(0, weight=1)

s = None
try:
	for af, socktype, proto, canonname, sa in socket.getaddrinfo(host, port, socket.AF_UNSPEC, socket.SOCK_STREAM):
		try:
			s = socket.socket(af, socktype, proto)
		except OSError:
			s = None
			continue
		try:
			s.connect((host, port))
		except OSError:
			s.close()
			s = None
			continue
		break

except socket.gaierror:
	pass
	
sock_lock = threading.Lock()

def sendline(sock, line):
	assert '\n' not in line
	with sock_lock:
		sock.sendall(line.encode() + b'\r\n')

still_connected = True
if s is not None:
	sendline(s, 'nick {}'.format(nick))
	sendline(s, 'USER {} a a :{}'.format(username, username))

	Receiver(s).start()

else:
	scrollback_append('Failed to establish connection')
	inputline.state(['disabled'])
	still_connected = False

def append_message(target, nick, message):
	scrollback_append('{} <{}> {}'.format(target, nick, message))

def send(*_):
	global nick, still_connected
	line = input_text.get()
	
	if line.startswith('/'):
		command, _, args = line[1:].lstrip().partition(' ')
		command = command.lower()
		if command == 'join':
			channel.set(args.strip())
			sendline(s, 'JOIN {}'.format(channel.get()))
		elif command == 'msg':
			target, _, message = args.lstrip().partition(' ')
			sendline(s, 'PRIVMSG {} :{}'.format(target, message))
			append_message(target, nick, message)
		elif command == 'nick':
			nick = args.strip()
			sendline(s, 'NICK {}'.format(nick))
		elif command == 'part':
			part_channel = channel.get() if args.strip() == '' else args.strip()
			if part_channel == channel.get(): channel.set('')
			sendline(s, 'PART {}'.format(part_channel))
		elif command == 'quit':
			reason = 'TkPyrkki quit' if args.strip() == '' else args.strip()
			sendline(s, 'QUIT :{}'.format(reason))
			inputline.state(['disabled'])
			still_connected = False
		elif command == 'raw':
			sendline(s, args)
		elif command == 'target':
			channel.set(args.strip())
		else:
			return
	else:
		if channel.get() != '':
			sendline(s, 'PRIVMSG {} :{}'.format(channel.get(), line))
			append_message(channel.get(), nick, line)
		else:
			return
			
	input_text.set('')

inputline.bind('<Return>', send)

def quit():
	if still_connected:
		sendline(s, 'QUIT :TkPyrkki quit')
	while not receiver_quit:
		time.sleep(0.1)
	root.destroy()
root.protocol('WM_DELETE_WINDOW', quit)

root.mainloop()