#!/usr/bin/env python
# 
#   skyped.py
#  
#   Copyright (c) 2007 by Miklos Vajna <vmiklos@frugalware.org>
#
#   It uses several code from a very basic python CLI interface, available at:
#
#   http://forum.skype.com/index.php?showtopic=42640
#  
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
# 
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#  
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
#   USA.
#

import sys
import os
import signal
import locale
import time
import dbus
import dbus.service
import dbus.mainloop.glib
import gobject
import socket
import getopt

__version__ = "0.1.1"

SKYPE_SERVICE = 'com.Skype.API'
CLIENT_NAME = 'SkypeApiPythonShell'

# well, this is a bit hackish. we store the socket of the last connected client
# here and notify it. maybe later notify all connected clients?
conn = None

def sig_handler(signum, frame):
	mainloop.quit()

def input_handler(fd, io_condition):
	input = fd.recv(1024)
	for i in input.split("\n"):
		if i:
			for j in skype.send(i.strip()):
				fd.send((j + "\n").encode(locale.getdefaultlocale()[1]))
	return True

def server(host, port):
	sock = socket.socket()
	sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
	sock.bind((host, port))
	sock.listen(1)
	gobject.io_add_watch(sock, gobject.IO_IN, listener)

def listener(sock, *args):
	global conn
	conn, addr = sock.accept()
	fileno = conn.fileno()
	gobject.io_add_watch(conn, gobject.IO_IN, input_handler)
	return True

def dprint(msg):
	global options

	if options.debug:
		print msg

class SkypeApi(dbus.service.Object):
	def __init__(self):
		bus = dbus.SessionBus()
		try:
			self.skype_api = bus.get_object(SKYPE_SERVICE, '/com/Skype')
		except dbus.exceptions.DBusException:
			sys.exit("Can't find any Skype instance. Are you sure you have started Skype?")

		reply = self.send('NAME ' + CLIENT_NAME)
		if reply[0] != 'OK':
			sys.exit('Could not bind to Skype client')

		reply = self.send('PROTOCOL 5')
		try:
			dbus.service.Object.__init__(self, bus, "/com/Skype/Client", bus_name='com.Skype.API')
		except KeyError:
			sys.exit()

	# skype -> client (async)
	@dbus.service.method(dbus_interface='com.Skype.API')
	def Notify(self, msg_text):
		global conn
		dprint('<< ' + msg_text)
		if conn:
			conn.send(msg_text + "\n")

	# client -> skype (sync, 5 sec timeout)
	def send(self, msg_text):
		if not len(msg_text):
			return
		dprint('>> ' + msg_text)
		try:
			reply = self.skype_api.Invoke(msg_text)
		except dbus.exceptions.DBusException, s:
			reply = str(s)
			if(reply.startswith("org.freedesktop.DBus.Error.ServiceUnknown")):
				try:
					self.remove_from_connection(dbus.SessionBus(), "/com/Skype/Client")
				except LookupError:
					pass
				mainloop.quit()
		if "\n" in reply:
			# crappy skype prefixes only the first line for
			# multiline messages so we need to do so for the other
			# lines, too. this is something like:
			# 'CHATMESSAGE id BODY first line\nsecond line' ->
			# 'CHATMESSAGE id BODY first line\nCHATMESSAGE id BODY second line'
			prefix = " ".join(reply.split(" ")[:3])
			reply = ["%s %s" % (prefix, i) for i in " ".join(reply.split(" ")[3:]).split("\n")]
		else:
			reply = [reply]
		for i in reply:
			dprint('<< ' + i)
		return reply

class Options:
	def __init__(self):
		self.daemon = True
		self.debug = False
		self.help = False
		self.port = 2727
		self.version = False

	def usage(self, ret):
		print """Usage: skyped [OPTION]...

skyped is a daemon that acts as a tcp server on top of a Skype instance.

Options:
	-d	--debug		enable debug messages
	-h	--help		this help
	-n	--nofork	don't run as daemon in the background
	-p	--port		set the tcp port (default: %d)
	-v	--version	display version information""" % self.port
		sys.exit(ret)

if __name__=='__main__':
	options = Options()
	try:
		opts, args = getopt.getopt(sys.argv[1:], "dhnp:v", ["daemon", "help", "nofork", "port=", "version"])
	except getopt.GetoptError:
		options.usage(1)
	for opt, arg in opts:
		if opt in ("-d", "--debug"):
			options.debug = True
		elif opt in ("-h", "--help"):
			options.help = True
		elif opt in ("-n", "--nofork"):
			options.daemon = False
		elif opt in ("-p", "--port"):
			options.port = arg
		elif opt in ("-v", "--version"):
			options.version = True
	if options.help:
		options.usage(0)
	elif options.version:
		print "skyped %s" % __version__
		sys.exit(0)
	elif options.daemon:
		pid = os.fork()
		if pid == 0:
			nullin = file('/dev/null', 'r')
			nullout = file('/dev/null', 'w')
			os.dup2(nullin.fileno(), sys.stdin.fileno())
			os.dup2(nullout.fileno(), sys.stdout.fileno())
			os.dup2(nullout.fileno(), sys.stderr.fileno())
		else:
			print 'skyped is started on port %s, pid: %d' % (options.port, pid)
			sys.exit(0)
	dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
	signal.signal(signal.SIGINT, sig_handler)
	mainloop = gobject.MainLoop()
	server('0.0.0.0', options.port)
	while True:
		skype = SkypeApi()
		mainloop.run()