from msg_container import MsgContainer
from msg_listener import MsgListener
from msg_talker import MsgTalker
from struct import pack

class NmeaPacketizer(MsgListener, MsgTalker):
	def __init__(self):
		MsgListener.__init__(self)
		MsgTalker.__init__(self)
		self.packet = b''
		self.wait_sync = True

	def on_recv(self, msg: MsgContainer):
		name = msg.name
		data = msg.data
		for n in range (len(data)):
			d = data[n]
			if d == 13 or d == 10:
				timestamp = msg.timestamp
				self.wait_sync = False
				if len(self.packet) > 0:
					self.call_listener(MsgContainer(name, timestamp, self.packet))
					self.wait_sync = True
					self.packet = b''
			elif not self.wait_sync:
				self.packet += pack('B', d)



	def is_msg(self, msg: MsgContainer):
		return True