import machine
import time
from machine import Timer
import urequests as requests


#
# Class for handling alarms and calling FHEM
#
class DelayedSwitch:

    def __init__(self,delay,rtc):
        self.__delay = delay
        self.__alarm = None
        self.__is_light_on = False
        self.__rtc = rtc


    def _get_switch_status(self):
        # check status of light
        r = self._call_ccu3("http://10.0.10.81/addons/red/switch/state")
        try:
            data = r.json()
            self.__is_light_on = data.get('state', False)
        except:
            print("Error parsing JSON response")
            self.__is_light_on = False
        r.close()
        if self.__is_light_on:
            print("Light is already on.")
        else:
            print("Light is off.")

    #
    # Switch of the light through FHEM
    def _switch_off_handler(self, alarm):
        print("Switching light off")
        r = self._call_ccu3("http://10.0.10.81/addons/red/switch/off")
        self.__is_light_on = False
        # close the response object
        r.close()

    #
    # Call CCU3
    #
    def _call_ccu3(self,url):
        try:
            r = requests.get(url)
        except OSError as oer:
            print("Resetting. We received OSSeror: ", oer)
            machine.reset()
        return r

    def is_light_on(self):
        return self.__is_light_on

    def set_delay(self,d):
        self.__delay = d

    def absence(self):
        # cancel any previous time (if any)
        if self.__alarm != None:
            print("Canceling previous alarm")
            self.__alarm.deinit()

        print("Alarm started to switch off in:", self.__delay)
        self.__alarm = Timer(-1)
        self.__alarm.init(period=self.__delay, mode=Timer.ONE_SHOT, callback=self._switch_off_handler)
        #self.__alarm = Timer.Alarm(self._switch_off_handler, self.__delay, periodic=False)


    def presence(self):
        # cancel any previous time (if any)
        if self.__alarm != None:
            print("Canceling previous alarm")
            self.__alarm.deinit()

        # Check if we light is really on
        # (in case somebody manually switched it off)
        if self.__is_light_on:
            self._get_switch_status()

        #
        # Switch light on
        #
        if not self.__is_light_on:
            print("Switching light on")
            r = self._call_ccu3("http://10.0.10.81/addons/red/switch/on")
            self.__is_light_on = True
            # close the response object
            r.close()