#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import time
import sys
import traceback
import xml.etree.ElementTree as ET

from timeFunctions import *
from settings import SensorType
import settings

class Logger(object):
	def __init__(self, log):
		self.temp_sensors = settings.tempSensors
		self.temp_prev_default = settings.prev_temps_default
		self.prev_temps = []
		for i in range(self.temp_sensors):
			self.prev_temps.append(self.temp_prev_default)
		self.temp_max_diff = settings.tempmaxdiff
		self.log = log
		self.records = settings.records
		self.units = settings.SENSOR_UNITS
	
	def temp_rise(self, old, new,sensor):
		if(old == self.temp_prev_default):
			return True
		if(((old-new) > self.temp_max_diff) or ((new-old) > self.temp_max_diff)):
			self.log.write('error checking ' + sensor + ';prev(' + str(old) + ');cur(' + str(new) + '); ... @' + time.ctime() + "\n")
			self.log.flush()
			return False
		else:
			return True
	
	##########################################
	# common function to write value to file #
	##########################################
	def write_value(self, value, sensor):
		# TODO: catch IOError
		valuename = self.records + "/" + sensor + "_" + preptime()
		valuelog=open(valuename, 'a')
		valuelog.write(str(value) + ';' + str( int(time.time()) ) + "\n")
		valuelog.close()

	##########################################
	# generic callback	 					 #
	##########################################
	def cb_generic(self,value, sensor, type, supress = False):
		if type == SensorType.temp:
			i = int(sensor[-1])-1 #sensor contains name, followed by int
			if self.temp_rise(self.prev_temps[i], value, sensor):
				self.write_value(value, sensor)
				self.prev_temps[i] = value
		elif (type == SensorType.none):
			return
		else:
			self.write_value(value, sensor)
		unit = self.units[type]
		if not supress:
			print(sensor + ': ' + str(value/unit[0]) + ' ' + unit[1] + ', ' + str(time.ctime()) )
	
	###########################################
	# exception logging						  #
	###########################################
	def printException(self, inst):
		tree = ET.parse(settings.exceptionlog)
		root = tree.getroot()
		new = ET.Element('exception', {'class':str( type(inst) ).split("'")[1], 'date':str( time.ctime() ), 'time':str( int(time.time()) ), 'type':str(inst)})
		new.text = traceback.format_exc()
		root.append(new)
		tree.write(settings.exceptionlog)
		message = 'an Exception happend @' + time.ctime()+"\n"
		self.log.write(message)
		self.log.flush()
		print(message)