import sync
import sync.Protocol

clients = []
letters = {}

# SYNCLetter - the letter protocol defined as a class
class SYNCLetter( sync.Protocol ):

	# client connected to server
	def onConnect( self ):

		# add the new client to the client list
		self.clients.append(self)
		
		# update the number of users
		for c in self.clients:
			c.send('b '+ str(len(self.clients)))


	# client disconnected from server
	def onDisconnect( self ):

		# remove the client from the client list
		self.clients.remove(self)

		# update the number of users
		for c in self.clients:
			c.send('b '+ str(len(self.clients)))


	# server recieved data from client
	def onData (self, data):
	
		# convert message into an list
		# messages are space delimited
		msg = data.split(' ')
		
		# determine message type and fire function
		# do nothing if the message is malformed or disfuntional
		
		if msg[0] == 'a':
		
			#fire the info method with the message array
			self.info( msg )
			
		elif msg[0] == 'c':
		
			#fire the letter method with the message array
			self.letter( msg )


	# letter method
	def letter(self, msg):
	
		# store letters coordinates in letters object
		self.letters[string.split(msg[1],":")[0]] = msg[1]
		
		# send new letter coordinates to users
		for c in self.clients:
			c.send('c ' + msg[1] )

	# info method
	def info(self, msg):
	
		# send all letter coordinates to user
		self.send('a '+string.join(self.letters.values(),'|'))

sync.enable( 'central.powersdk.com', 1540 , SYNCLetter )
sync.start()