import json
import logging
import mqtt
import nagios
import time

try:
    from config import APP_NAME as ROOT_LOGGER_NAME
except ImportError:
    ROOT_LOGGER_NAME = 'root'
logger = logging.getLogger(ROOT_LOGGER_NAME).getChild(__name__)


class base(object):
    MONITORING_HEARTBEAT = "heartbeat"
    MONITORING_BATTERY = "battery"
    MONITORING_FOLLOW_SETPOINT = "follow_setpoint"
    #
    FOLLOW_REQUEST_WARNING = 5      # Seconds, till warning comes up, if device does not follow the command
    FOLLOW_REQUEST_ERROR = 60       # Seconds, till error comes up, if device does not follow the command
    FOLLOW_KEY = None
    #
    BATTERY_LVL_WARNING = 15
    BATTERY_LVL_ERROR = 5
    #
    LAST_MSG_WARNING = 6 * 60 * 60
    LAST_MSG_ERROR = 24 * 60 * 60

    def __init__(self, mqtt_client: mqtt.mqtt_client, topic):
        self.topic = topic
        #
        self.__unknown_tm__ = {}
        #
        mqtt_client.add_callback(topic, self.__rx__)
        mqtt_client.add_callback(topic + '/#', self.__rx__)
        #
        self.last_device_msg = None
        #
        self.__target_storage__ = {}
        self.__state_storage__ = {}
        #
        self.battery = None

    def __rx__(self, client, userdata, message):
        try:
            payload = json.loads(message.payload)
        except json.decoder.JSONDecodeError:
            pass
        else:
            if type(payload) is dict:
                #
                # heartbeat
                #
                if message.topic == self.topic:
                    self.last_device_msg = time.time()
                #
                # follow setpoint
                #
                if self.FOLLOW_KEY is not None and self.FOLLOW_KEY in payload:
                    if message.topic == self.topic + '/set':
                        self.target(self.FOLLOW_KEY, payload[self.FOLLOW_KEY])
                    if message.topic == self.topic:
                        self.state(self.FOLLOW_KEY, payload[self.FOLLOW_KEY])
                #
                # battery level
                #
                if self.MONITORING_BATTERY in payload and message.topic == self.topic:
                    self.battery = payload[self.MONITORING_BATTERY]

    def target(self, key, value):
        tm_t, value_t = self.__target_storage__.get(key, (0, None))
        if value != value_t:
            self.__target_storage__[key] = time.time(), value
        logger.debug("Target value for device identified: %s: %s", key, repr(value))

    def state(self, key, value):
        self.__state_storage__[key] = time.time(), value
        logger.debug("Device state identified: %s: %s", key, repr(value))

    def status(self, key):
        #
        # HEARTBEAT
        #
        if key == self.MONITORING_HEARTBEAT:
            if self.last_device_msg is None:
                return self.__nagios_return__(self.MONITORING_HEARTBEAT, nagios.Nagios.UNKNOWN, "Device exists, but no data received")
            else:
                dt = time.time() - self.last_device_msg
                dt_disp = dt / 60 / 60
                if dt > self.LAST_MSG_ERROR:
                    return self.__nagios_return__(self.MONITORING_HEARTBEAT, nagios.Nagios.ERROR, "Last message %.1fh ago" % dt_disp)
                elif dt > self.LAST_MSG_WARNING:
                    return self.__nagios_return__(self.MONITORING_HEARTBEAT, nagios.Nagios.WARNING, "Last message %.1fh ago" % dt_disp)
                else:
                    return self.__nagios_return__(self.MONITORING_HEARTBEAT, nagios.Nagios.OK, "Last message %.1fh ago" % dt_disp)
        #
        # FOLLOW SETPOINT
        #
        elif key == self.MONITORING_FOLLOW_SETPOINT:
            if self.FOLLOW_KEY is None:
                return self.__nagios_return__(self.MONITORING_FOLLOW_SETPOINT, nagios.Nagios.UNKNOWN, "Device exist, but does not follow any setpoint.", force=True)
            tm_s, value_s = self.__state_storage__.get(self.FOLLOW_KEY, (0, None))
            try:
                tm_t, value_t = self.__target_storage__[self.FOLLOW_KEY]
            except KeyError:
                if value_s is not None:
                    return self.__nagios_return__(self.MONITORING_FOLLOW_SETPOINT, nagios.Nagios.WARNING, "Current temperature setpoint %.1f°C (age=%.1fmin), but never received a setpoint" % (value_s, (time.time()-tm_s)/60))
                return self.__nagios_return__(self.MONITORING_FOLLOW_SETPOINT, nagios.Nagios.UNKNOWN, "Device exists, but no data received")
            else:
                tm = time.time()
                dt = tm - tm_t
                if value_t != value_s and dt > self.FOLLOW_REQUEST_ERROR:
                    return self.__nagios_return__(self.MONITORING_FOLLOW_SETPOINT, nagios.Nagios.ERROR, "Requested setpoint unequal valve setpoint %.1f°C since %.1fmin" % (value_s, (time.time()-tm_s)/60))
                elif value_t != value_s and dt > self.FOLLOW_REQUEST_WARNING:
                    return self.__nagios_return__(self.MONITORING_FOLLOW_SETPOINT, nagios.Nagios.WARNING, "Requested setpoint unequal valve setpoint %.1f°C since %.1fmin" % (value_s, (time.time()-tm_s)))
                return self.__nagios_return__(self.MONITORING_FOLLOW_SETPOINT, nagios.Nagios.OK, "Requested setpoint equal valve setpoint %.1f°C" % value_s)
        #
        # BATTERY
        #
        elif key == self.MONITORING_BATTERY:
            if self.battery is None:
                return self.__nagios_return__(self.MONITORING_BATTERY, nagios.Nagios.UNKNOWN, "Device exists, but no data received or unknown monitoring")
            elif self.battery <= self.BATTERY_LVL_ERROR:
                return self.__nagios_return__(self.MONITORING_BATTERY, nagios.Nagios.ERROR, "Battery level critical low (%.1f%%)" % self.battery)
            elif self.battery <= self.BATTERY_LVL_WARNING:
                return self.__nagios_return__(self.MONITORING_BATTERY, nagios.Nagios.WARNING, "Battery level low (%.1f%%)" % self.battery)
            else:
                return self.__nagios_return__(self.MONITORING_BATTERY, nagios.Nagios.OK, "Battery okay (%.1f%%)" % self.battery)

    def __nagios_return__(self, monitoring_name, status, msg, force=False):
        tm = time.time()
        if monitoring_name not in self.__unknown_tm__:
            self.__unknown_tm__[monitoring_name] = None
        if status == nagios.Nagios.UNKNOWN and not force:
            if self.__unknown_tm__[monitoring_name] is None:
                self.__unknown_tm__[monitoring_name] = tm
            dt = tm - self.__unknown_tm__[monitoring_name]
            if dt >= self.LAST_MSG_ERROR:
                status = nagios.Nagios.UNKNOWN
            elif dt >= self.LAST_MSG_WARNING:
                status = nagios.Nagios.WARNING
            else:
                status = nagios.Nagios.OK
            msg += " - since %.1fh" % (dt / 3600)
        else:
            self.__unknown_tm__[monitoring_name] = None
        return {"status": status, "msg": msg}


class group(object):
    def __init__(self, *args, **kwargs):
        pass


class shelly_sw1(base):
    pass


class tradfri_sw(base):
    pass


class tradfri_sw_br(base):
    pass


class tradfri_sw_br_ct(base):
    pass


class tradfri_button(base):
    pass


class livarno_sw_br_ct(base):
    pass


class brennenstuhl_heatingvalve(base):
    BATTERY_LVL_WARNING = 4
    BATTERY_LVL_ERROR = 3
    FOLLOW_KEY = "current_heating_setpoint"


class silvercrest_powerplug(base):
    pass


class silvercrest_motion_sensor(base):
    pass


class my_powerplug(base):
    pass


class audio_status(base):
    pass


class remote(base):
    pass