#!/usr/bin/python
# -*- coding: UTF-8 -*-

"""
FMS Decoder

@author: Bastian Schroll

@requires: Configuration has to be set in the config.ini
"""

import logging # Global logger
import re      # Regex for validation

from includes import globals  # Global variables
from includes import doubleFilter  # double alarm filter

##
#
# FMS decoder function
# validate -> check double alarm -> log
#
def decode(freq, decoded):
	"""
	Export FMS Information from Multimon-NG RAW String and call alarmHandler.processAlarm()

	@type    freq: string
	@param   freq: frequency of the SDR Stick
	@type    decoded: string
	@param   decoded: RAW Information from Multimon-NG

	@requires:  Configuration has to be set in the config.ini

	@return:    nothing
	@exception: Exception if FMS decode failed
	"""
	try:
		fms_service = decoded[19]            # Organisation
		fms_country = decoded[36]            # Bundesland
		fms_location = decoded[65:67]        # Ort
		fms_vehicle = decoded[72:76]         # Fahrzeug
		fms_status = decoded[84]             # Status
		fms_direction = decoded[101]         # Richtung
		fms_directionText = decoded[103:110] # Richtung (Text)
		fms_tsi = decoded[114:117]           # Taktische Kruzinformation

		if "CRC correct" in decoded: #check CRC is correct
			fms_id = fms_service+fms_country+fms_location+fms_vehicle+fms_status+fms_direction # build FMS id
			# if FMS is valid
			if re.search("[0-9a-f]{8}[0-9a-f]{1}[01]{1}", fms_id):
				# check for double alarm
				if doubleFilter.checkID("FMS", fms_id):
					logging.info("FMS:%s Status:%s Richtung:%s TSI:%s", fms_id[0:8], fms_status, fms_direction, fms_tsi)
					data = {"fms":fms_id[0:8], "status":fms_status, "direction":fms_direction, "directionText":fms_directionText, "tsi":fms_tsi, "description":fms_id[0:8]}
					# If enabled, look up description
					if globals.config.getint("FMS", "idDescribed"):
						from includes import descriptionList
						data["description"] = descriptionList.getDescription("FMS", fms_id[0:8])
					# processing the alarm
					try:
						from includes import alarmHandler
						alarmHandler.processAlarm("FMS", freq, data)
					except:
						logging.error("processing alarm failed")
						logging.debug("processing alarm failed", exc_info=True)
						pass
				# in every time save old data for double alarm
				doubleFilter.newEntry(fms_id)
			else:
				logging.warning("No valid FMS: %s", fms_id)
		else:
			logging.warning("FMS CRC incorrect")
	except:
		logging.error("error while decoding")
		logging.debug("error while decoding", exc_info=True)