from GUIComponent import GUIComponent
from VariableText import VariableText
from VariableValue import VariableValue

from enigma import iPlayableService
from enigma import eLabel, eSlider, eTimer


class PerServiceBase(object):
	EventMap = { }

	@staticmethod
	def event(ev):
		func_list = PerServiceBase.EventMap.setdefault(ev, [])
		for func in func_list:
			if func[0]: # with_event
				func[1](ev)
			else:
				func[1]()

	def __init__(self, navcore, eventmap, with_event=False):
		self.navcore = navcore
		self.eventmap = eventmap
		self.poll_timer = eTimer()
		self.with_event = with_event

		self.poll_timer.callback.append(self.poll)

		EventMap = PerServiceBase.EventMap
		if not len(EventMap):
			self.navcore.event.append(PerServiceBase.event)

		EventMap = EventMap.setdefault
		for x in eventmap.iteritems():
			EventMap(x[0], []).append((with_event, x[1]))

		# start with stopped state, so simulate that
		evEndEntry = eventmap.get(iPlayableService.evEnd)
		if evEndEntry:
			if with_event:
				evEndEntry(iPlayableService.evEnd)
			else:
				evEndEntry()

	def destroy(self):
		EventMap = PerServiceBase.EventMap.setdefault
		for x in self.eventmap.iteritems():
			EventMap(x[0], []).remove((self.with_event, x[1]))

	def enablePolling(self, interval=60000):
		if interval:
			self.poll_timer.start(interval)
		else:
			self.poll_timer.stop()
	
	def disablePolling(self):
		self.enablePolling(interval=0)

	def poll(self):
		pass

class PerServiceDisplay(PerServiceBase, VariableText, GUIComponent):
	"""Mixin for building components which display something which changes on navigation events, for example "service name" """
	def __init__(self, navcore, eventmap):
		GUIComponent.__init__(self)
		VariableText.__init__(self)
		PerServiceBase.__init__(self, navcore, eventmap)

	def destroy(self):
		PerServiceBase.destroy(self)
		GUIComponent.destroy(self)

	GUI_WIDGET = eLabel

class PerServiceDisplayProgress(PerServiceBase, VariableValue, GUIComponent):
	def __init__(self, navcore, eventmap):
		GUIComponent.__init__(self)
		VariableValue.__init__(self)
		PerServiceBase.__init__(self, navcore, eventmap)
		self.eventmap = eventmap
		self.navcore = navcore
		self.navcore.event.append(self.event)

		# start with stopped state, so simulate that
		self.event(iPlayableService.evEnd)

	GUI_WIDGET = eSlider

	def destroy(self):
		PerServiceBase.destroy(self)
		GUIComponent.destroy(self)