import goocanvas

from sugar.canvas.IconItem import IconItem
from sugar.canvas.IconColor import IconColor
from sugar.canvas.CanvasBox import CanvasBox
from sugar.presence import PresenceService
from view.BuddyIcon import BuddyIcon
from model.BuddyInfo import BuddyInfo

class RightPanel(CanvasBox):
	def __init__(self, shell):
		CanvasBox.__init__(self, shell.get_grid(), CanvasBox.VERTICAL, 1)
		self._shell = shell
		self._activity_ps = None
		self._joined_hid = -1
		self._left_hid = -1
		self._buddies = {}

		self._pservice = PresenceService.get_instance()
		self._pservice.connect('activity-appeared',
							   self.__activity_appeared_cb)

		shell.get_model().connect('activity-changed',
								  self.__activity_changed_cb)

	def add(self, buddy):
		icon = BuddyIcon(self._shell, BuddyInfo(buddy))
		icon.set_menu_distance(1)
		self.set_constraints(icon, 3, 3)
		self.add_child(icon)

		self._buddies[buddy.get_name()] = icon

	def remove(self, buddy):
		i = self.find_child(self._buddies[buddy.get_name()])
		self.remove_child(i)

	def clear(self):
		while (self.get_n_children() > 0):
			self.remove_child(0)
		self._buddies = {}

	def __activity_appeared_cb(self, pservice, activity_ps):
		activity = self._shell.get_model().get_current_activity()
		if activity and activity_ps.get_id() == activity.get_id():
			self._set_activity_ps(activity_ps)

	def _set_activity_ps(self, activity_ps):
		if self._activity_ps == activity_ps:
			return

		if self._joined_hid > 0:
			self._activity_ps.disconnect(self._joined_hid)
			self._joined_hid = -1
		if self._left_hid > 0:
			self._activity_ps.disconnect(self._left_hid)
			self._left_hid = -1

		self._activity_ps = activity_ps

		self.clear()

		if activity_ps != None:
			for buddy in activity_ps.get_joined_buddies():
				self.add(buddy)

			self._joined_hid = activity_ps.connect(
							'buddy-joined', self.__buddy_joined_cb)
			self._left_hid = activity_ps.connect(
							'buddy-left', self.__buddy_left_cb)

	def __activity_changed_cb(self, group, activity):
		activity_ps = self._pservice.get_activity(activity.get_id())
		self._set_activity_ps(activity_ps)				

	def __buddy_joined_cb(self, activity, buddy):
		self.add(buddy)

	def __buddy_left_cb(self, activity, buddy):
		self.remove(buddy)