#! /usr/bin/python

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__author__="bjschuma"
__date__ ="$Feb 24, 2010 9:13:41 PM$"


# Maintain the list of guests
class GuestList(list):
	def __init__(self):
		list.__init__(self)
		self.active = False

	def add(self, item, priority):
		self += [(priority, item)]
		self.sort()



class Event(dict):
	def __init__(self):
		dict.__init__(self)
		self.nextEvent = 0
		self.create("OCARINA_START")
		self.create("OCARINA_QUIT")
		self.create("OCARINA_PLAY")
		self.create("OCARINA_PAUSE")


	def create(self,name):
		var = "self." + name.upper()
		exec var + " = " + str(self.nextEvent)
		self.nextEvent += 1
		exec "self["+var+"] = GuestList()"


	def has(self,key):
		return (key in self.keys())


	# Add a "guest" (function or script) to this event
	def invite(self, name, guest, priority=None):
		if priority==None:
				priority = 100
		self[name].add(guest, priority)


	# Remove a guest from the guest list
	def uninvite(self, name, guest):
		self[name].remove(guest)


	def stop(self,name):
		self[name].active = False


	# Start the party!
	def start(self,name,args=None):
		if self.has(name) == False:
			return

		self[name].active = True

		for priority,guest in self[name]:
			if self[name].active == False:
				break
			elif self[name].active == True:
				if args==None:
					guest()
				else:
					guest(args)

		self.stop(name)