
"""
This plugin implements D-Bus features for Sonata:

 * Check that only one instance of Sonata is running at a time
 * Allow other programs to request the info popup, and to show or to toggle 
   the main window visibility
 * Listen to Gnome 2.18+ multimedia key events

XXX Not a real plugin yet.

Example usage:
import dbus_plugin as dbus
self.dbus_service = dbus.SonataDBus(self.dbus_show, self.dbus_toggle, self.dbus_popup)
dbus.start_dbus_interface(toggle_arg, popup_arg)
dbus.init_gnome_mediakeys(self.mpd_pp, self.mpd_stop, self.mpd_prev, self.mpd_next)
if not dbus.using_gnome_mediakeys():
        # do something else instead...
"""

import sys

try:
	import dbus, dbus.service
	if getattr(dbus, "version", (0, 0, 0)) >= (0, 41, 0):
		import dbus.glib
	if getattr(dbus, "version", (0, 0, 0)) >= (0, 80, 0):
		import _dbus_bindings as dbus_bindings
		NEW_DBUS = True
	else:
		import dbus.dbus_bindings as dbus_bindings
		NEW_DBUS = False
	HAVE_DBUS = True
except:
	HAVE_DBUS = False

def using_dbus():
	return HAVE_DBUS

HAVE_GNOME_MMKEYS = False

def using_gnome_mediakeys():
	return HAVE_GNOME_MMKEYS

def init_gnome_mediakeys(mpd_pp, mpd_stop, mpd_prev, mpd_next):
	global HAVE_GNOME_MMKEYS
	if HAVE_DBUS:
		try:
			bus = dbus.SessionBus()
			dbusObj = bus.get_object('org.freedesktop.DBus', '/org/freedesktop/DBus')
			dbusInterface = dbus.Interface(dbusObj, 'org.freedesktop.DBus')
			if dbusInterface.NameHasOwner('org.gnome.SettingsDaemon'):
				try:
					# mmkeys for gnome 2.22+
					settingsDaemonObj = bus.get_object('org.gnome.SettingsDaemon', '/org/gnome/SettingsDaemon/MediaKeys')
					settingsDaemonInterface = dbus.Interface(settingsDaemonObj, 'org.gnome.SettingsDaemon.MediaKeys')
					settingsDaemonInterface.GrabMediaPlayerKeys('Sonata', 0)
				except:
					# mmkeys for gnome 2.18+
					settingsDaemonObj = bus.get_object('org.gnome.SettingsDaemon', '/org/gnome/SettingsDaemon')
					settingsDaemonInterface = dbus.Interface(settingsDaemonObj, 'org.gnome.SettingsDaemon')
					settingsDaemonInterface.GrabMediaPlayerKeys('Sonata', 0)
				settingsDaemonInterface.connect_to_signal('MediaPlayerKeyPressed', lambda app, key:mediaPlayerKeysCallback(mpd_pp, mpd_stop, mpd_prev, mpd_next, app, key))
				HAVE_GNOME_MMKEYS = True
		except:
			pass

def mediaPlayerKeysCallback(mpd_pp, mpd_stop, mpd_prev, mpd_next, app, key):
	if app == 'Sonata':
		if key in ('Play', 'PlayPause', 'Pause'):
			mpd_pp(None)
		elif key == 'Stop':
			mpd_stop(None)
		elif key == 'Previous':
			mpd_prev(None)
		elif key == 'Next':
			mpd_next(None)

def get_session_bus():
	try:
		return dbus.SessionBus()
	except Exception:
		print _("Sonata failed to connect to the D-BUS session bus: Unable to determine the address of the message bus (try 'man dbus-launch' and 'man dbus-daemon' for help)")
		raise

def execute_remote_commands(toggle=False, popup=False, start=False):
	try:
		bus = get_session_bus()
		obj = bus.get_object('org.MPD', '/org/MPD/Sonata')
		if toggle:
			obj.toggle(dbus_interface='org.MPD.SonataInterface')
		if popup:
			obj.popup(dbus_interface='org.MPD.SonataInterface')
		sys.exit()
	except Exception:
		print _("Failed to execute remote commands.")
		if start is None or start:
			print _("Starting Sonata instead...")
		else:
			print _("Maybe Sonata is not running?")
			sys.exit(1)

def start_dbus_interface():
	if HAVE_DBUS:
		try:
			bus = get_session_bus()
			if NEW_DBUS:
				retval = bus.request_name("org.MPD.Sonata", dbus_bindings.NAME_FLAG_DO_NOT_QUEUE)
			else:
				retval = dbus_bindings.bus_request_name(bus.get_connection(), "org.MPD.Sonata", dbus_bindings.NAME_FLAG_DO_NOT_QUEUE)
			if retval in (dbus_bindings.REQUEST_NAME_REPLY_PRIMARY_OWNER, dbus_bindings.REQUEST_NAME_REPLY_ALREADY_OWNER):
				pass
			elif retval in (dbus_bindings.REQUEST_NAME_REPLY_EXISTS, dbus_bindings.REQUEST_NAME_REPLY_IN_QUEUE):
				print _("An instance of Sonata is already running. Showing it...")
				try:
					obj = bus.get_object('org.MPD', '/org/MPD/Sonata')
					obj.show(dbus_interface='org.MPD.SonataInterface')
					sys.exit()
				except Exception:
					print _("Failed to execute remote command.")
					sys.exit(1)
		except Exception:
			pass
		except SystemExit:
			raise

if HAVE_DBUS:
	class SonataDBus(dbus.service.Object):
		def __init__(self, dbus_show, dbus_toggle, dbus_popup):
			self.dbus_show = dbus_show
			self.dbus_toggle = dbus_toggle
			self.dbus_popup = dbus_popup
			session_bus = get_session_bus()
			bus_name = dbus.service.BusName('org.MPD', bus=session_bus)
			object_path = '/org/MPD/Sonata'
			dbus.service.Object.__init__(self, bus_name, object_path)

		@dbus.service.method('org.MPD.SonataInterface')
		def show(self):
			self.dbus_show()

		@dbus.service.method('org.MPD.SonataInterface')
		def toggle(self):
			self.dbus_toggle()

		@dbus.service.method('org.MPD.SonataInterface')
		def popup(self):
			self.dbus_popup()
