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

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

class Receiver(threading.Thread):
	def __init__(self, s):
		self.s = s
		super().__init__()
		
	def run(self):
		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':
					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:]
					display_line = '{} <{}> {}'.format(target, msg_nick, message)
				else:
					display_line = line.decode(errors='replace')

				sys.stdout.buffer.raw.write(display_line.encode(sys.stdout.encoding, errors='replace') + b'\n')

if len(sys.argv) > 4:
	print('{} [server [port [nick]]]'.format(sys.argv[0]))
	sys.exit(1)

if len(sys.argv) > 1:
	host = sys.argv[1]
else:
	host = input('host [irc.libera.chat]> ').strip()
	if host == '': host = 'irc.libera.chat'
	
if len(sys.argv) > 2:
	try:
		port = int(sys.argv[2])
	except ValueError:
		print('Port must be an intenger')
else:
	while True:
		port = input('port [6667]> ').strip()
		if port == '': port = '6667'
		try:
			port = int(port)
		except ValueError:
			print('Port must be an intenger')
		break

if 'USER' in os.environ:
	username = os.environ['USER']
elif 'USERNAME' in os.environ:
	username = os.environ['USERNAME']
else:
	username = 'pyrkki-user'

if len(sys.argv) > 3:
	nick = sys.argv[3]
else:
	nick = input('nick [{}]> '.format(username)).strip()
	if nick == '': nick = username

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
sendline(s, 'nick {}'.format(nick))
sendline(s, 'USER {} a a :{}'.format(username, username))

Receiver(s).start()

channel = None
while True:
	line = input()
	if line == '': continue
	if line.startswith('/'):
		command, _, args = line[1:].lstrip().partition(' ')
		command = command.lower()
		if command == 'join':
			channel = args.strip()
			sendline(s, 'JOIN {}'.format(channel))
		elif command == 'msg':
			target, _, message = args.lstrip().partition(' ')
			sendline(s, 'PRIVMSG {} :{}'.format(target, message))
			print('{} <{}> {}'.format(target, target, message))
		elif command == 'nick':
			nick = args.strip()
			sendline(s, 'NICK {}'.format(nick))
		elif command == 'part':
			part_channel = channel if args.strip() == '' else args.strip()
			if part_channel == channel: channel = None
			sendline(s, 'PART {}'.format(part_channel))
		elif command == 'quit':
			reason = 'pyrkki quit' if args.strip() == '' else args.strip()
			sendline(s, 'QUIT :{}'.format(reason))
			break
		elif command == 'raw':
			sendline(s, args)
		elif command == 'target':
			channel = args.strip()
		else:
			print('! Unknown command /{}'.format(command))
	else:
		if channel is not None:
			sendline(s, 'PRIVMSG {} :{}'.format(channel, line))
			print('{} <{}> {}'.format(channel, nick, line))
		else:
			print('! Not on a channel')