#!/usr/bin/python3 -u
# coding=utf-8
from argparse import ArgumentParser
from time import sleep
import dbus
from _dbus_bindings import Connection, Message, MethodCallMessage, \
	BUS_DAEMON_NAME, BUS_DAEMON_PATH, BUS_DAEMON_IFACE

from os import environ, system



def parse_args():
	# type: () -> Args
	parser = ArgumentParser(description='lsdbus', add_help=True)

	lsdbus = parser.add_argument_group(title = 'process id', description = 'if none of these are specified, all messages will be shown')
	lsdbus.add_argument('-p', '--process_id',   action="store_true", help='show process ids')
	# lsdbus.add_argument('-h', '--help',  		action="store_true", help='shows this help')
	lsdbus.add_argument('-c', '--cmd_path', 	action="store_true", help='show command line path')
	lsdbus.add_argument('--continuously',       action="store_true", help='process is run continuously')
	lsdbus.add_argument('-a', '--unnamed',    action="store_true", help='show unnamed processes as well')

	return parser.parse_args()

# ARGS: -h help, -n names

bus = dbus.SessionBus() if 'DBUS_SESSION_BUS_ADDRESS' in environ else dbus.SystemBus()
# documentation="This script displays information about processes running on dbus. nid, name, pid and if requested path" \
# 			  "    Args: -h display this help" \
# 			  "		 -c continously update 1/s" \
# 			  "		 -n display path"

def get_current_name_owners(args):
	#
	# args = parse_args()

	# fake tuples for appending later
	if args.unnamed:
		tuples = []
		for name in bus.list_names():
			if name.startswith(':') and not name in [tuples[i][0] for i in range(0, len(tuples))]:
				tuples.append([bus.get_name_owner(name) if not name.startswith(':') else name, name if not name.startswith(':') else "Unnamed"])
			elif not name.startswith(':') and not bus.get_name_owner(name) in [tuples[i][0] for i in range(0, len(tuples))] and name != 'org.freedesktop.DBus':
				tuples.append([bus.get_name_owner(name), name])

	else:
		tuples = [
			[bus.get_name_owner(name), name]
			for name in bus.list_names()
			if not name.startswith(':') and name != 'org.freedesktop.DBus'
		]


	if args.cmd_path:
		for tup in tuples:
			tup.append(open(("/proc/" + str(
			call_daemon_blocking(bus, 'GetConnectionUnixProcessID', tup[0]).get_args_list()[0]) + '/cmdline').format(
			str(tup[0]))).read().replace('\0', ' ').rstrip())


	if args.process_id:
		for tup in tuples:
			tup.append(str(call_daemon_blocking(bus, 'GetConnectionUnixProcessID', tup[0]).get_args_list()[0]))

	# length = max([len(x[0]) for x in tuples]) + 2


	tuples.sort(key=lambda t: t[0])


	for tup in tuples:
		print(' '.join([x.ljust(max([len(x[i]) for x in tuples]) + 2) for i, x in enumerate(tup)]))
		# TODO PYTHON3 print(tup, sep=' ', end='', flush=True,)

	if args.continuously:
		sleep(2)
		system('clear')
		get_current_name_owners(args)

def call_daemon_blocking(con, member, *args):
	# type: (Connection, str, List[Any]) -> Message

	msg = MethodCallMessage(BUS_DAEMON_NAME, BUS_DAEMON_PATH, BUS_DAEMON_IFACE, member)

	for arg in args:
		msg.append(arg)

	return con.send_message_with_reply_and_block(msg)


argv = parse_args()
get_current_name_owners(argv)
	# while True:
	# 	system('clear')
	# 	get_current_name_owners()
	# 	sleep(1)