from msg_container import MsgContainer
from nmea.receiver import Nmea


class Gsv(Nmea):
	class Msg:
		def __init__(self):
			self.number_of_msg = None
			self.seq_number = None
			self.sat_vis = None
			self.sat_id = []
			self.elevation = []
			self.azimuth = []
			self.snr = []
			self.checksum = None

		def __repr__(self):
			return f"sat_vis: {self.sat_vis}, sat_id: {self.sat_id}, elevation: {self.elevation}, azimuth: {self.azimuth}, snr: {self.snr}"

	def __init__(self, name: str, tid: str):
		Nmea.__init__(self, name, tid=tid, msg_type="GSV")
		self.msg = None
		self.data = Gsv.Msg()

	def on_recv(self, msg: MsgContainer):
		msg_data = msg.data.decode(encoding="utf-8")
		data_list = msg_data.split(',')
		self.msg = data_list[0]

		data = self.data
		data.number_of_msg = data_list[1]
		data.seq_number = data_list[2]
		data.sat_vis = data_list[3]

		data_set_size = 4
		num_sats_in_msg = int(len(data_list[3:-2])/4)
		for n in range(num_sats_in_msg):
			data.sat_id.append(data_list[data_set_size*n+4])
			data.elevation.append(data_list[data_set_size*n+5])
			data.azimuth.append(data_list[data_set_size*n+6])
			data.snr.append(data_list[data_set_size*n+7])

		data.checksum = data_list[data_set_size*(num_sats_in_msg-1)+8]

		if self.data.number_of_msg == self.data.seq_number:
			print(data)
			self.data = Gsv.Msg()