import asyncio
import json
from re import M
from aiomqtt import Client, MqttError, Will
from contextlib import AsyncExitStack, asynccontextmanager
from cbpi import __version__
import logging
import shortuuid

class SatelliteController:

    def __init__(self, cbpi):
        self.client_id = shortuuid.uuid()
        self.cbpi = cbpi
        self.kettlecontroller = cbpi.kettle
        self.fermentercontroller = cbpi.fermenter
        self.sensorcontroller = cbpi.sensor
        self.actorcontroller = cbpi.actor
        self.logger = logging.getLogger(__name__)
        self.host = cbpi.static_config.get("mqtt_host", "localhost")
        self.port = cbpi.static_config.get("mqtt_port", 1883)
        self.username = cbpi.static_config.get("mqtt_username", None)
        self.password = cbpi.static_config.get("mqtt_password", None)
        self.client = None
        self.topic_filters = [
            ("cbpi/actor/+/on", self._actor_on),
            ("cbpi/actor/+/off", self._actor_off),
            ("cbpi/actor/+/power", self._actor_power),
            ("cbpi/updateactor", self._actorupdate),
            ("cbpi/updatekettle", self._kettleupdate),
            ("cbpi/updatesensor", self._sensorupdate),
            ("cbpi/updatefermenter", self._fermenterupdate),
        
        ]
        self.tasks = set()
    
    def remove_key(self,d, key):
        r = dict(d)
        del r[key]
        return r

    async def init(self):

        #not sure if required like done in the old routine
        async def cancel_tasks(tasks):
            for task in tasks:
                if task.done():
                    continue
                task.cancel()
                try:
                    await task
                except asyncio.CancelledError:
                    pass
        
        self.client = Client(self.host, port=self.port, username=self.username, password=self.password, will=Will(topic="cbpi/disconnect", payload="CBPi Server Disconnected"),identifier=self.client_id)
        self.loop = asyncio.get_event_loop()
        ## Listen for mqtt messages in an (unawaited) asyncio task
        task = self.loop.create_task(self.listen())
        ## Save a reference to the task so it doesn't get garbage collected
        self.tasks.add(task)
        task.add_done_callback(self.tasks.remove)

        self.logger.info("MQTT Connected to {}:{}".format(self.host, self.port))

    async def listen(self):
        while True:
            try:
                async with self.client as client:
                        await client.subscribe("#")
                        async for message in client.messages:
                            for topic_filter in self.topic_filters:
                                topic = topic_filter[0]
                                method = topic_filter[1]
                                if message.topic.matches(topic):
                                    await (method(message))
            except asyncio.CancelledError:
                # Cancel
                self.logger.warning("MQTT Listening Cancelled")
                break
            except MqttError as e:
                self.logger.error("MQTT Exception: {}".format(e))
            except Exception as e:
                self.logger.error("MQTT General Exception: {}".format(e))
            await asyncio.sleep(5)


    async def publish(self, topic, message, retain=False):
        if self.client is not None and self.client._connected:
            try:
                await self.client.publish(topic, message, qos=1, retain=retain)
            except Exception as e:
                self.logger.warning("Failed to push data via mqtt: {}".format(e))

    async def _actor_on(self, message):
            try:
                topic_key = str(message.topic).split("/")
                await self.cbpi.actor.on(topic_key[2])
                self.logger.warning("Processed actor {} on via mqtt".format(topic_key[2]))
            except Exception as e:
                self.logger.warning("Failed to process actor on via mqtt: {}".format(e))

    async def _actor_off(self, message):
            try:
                topic_key = str(message.topic).split("/")
                await self.cbpi.actor.off(topic_key[2])
                self.logger.warning("Processed actor {} off via mqtt".format(topic_key[2]))
            except Exception as e:
                self.logger.warning("Failed to process actor off via mqtt: {}".format(e))

    async def _actor_power(self, message):
            try:
                topic_key = str(message.topic).split("/")
                try:
                    power=int(message.payload.decode())
                    if power > 100: 
                        power = 100
                    if power < 0:
                        power = 0
                    await self.cbpi.actor.set_power(topic_key[2],power)
                    #await self.cbpi.actor.actor_update(topic_key[2],power)
                except:
                    self.logger.warning("Failed to set actor power via mqtt. No valid power in message")
            except:
                self.logger.warning("Failed to set actor power via mqtt")

    async def _kettleupdate(self, message):
            try:
                self.kettle=self.kettlecontroller.get_state()
                for item in self.kettle['data']:
                    self.cbpi.push_update("cbpi/{}/{}".format("kettleupdate",item['id']), item)
            except Exception as e:
                self.logger.warning("Failed to send kettleupdate via mqtt: {}".format(e))

    async def _fermenterupdate(self, message):
            try:
                self.fermenter=self.fermentercontroller.get_state()
                for item in self.fermenter['data']:
                    item_new=self.remove_key(item,"steps")
                    self.cbpi.push_update("cbpi/{}/{}".format("fermenterupdate",item['id']), item_new)
            except Exception as e:
                self.logger.warning("Failed to send fermenterupdate via mqtt: {}".format(e))

    async def _actorupdate(self, message):
            try:
                self.actor=self.actorcontroller.get_state()
                for item in self.actor['data']:
                    self.cbpi.push_update("cbpi/{}/{}".format("actorupdate",item['id']), item)
            except Exception as e:
                self.logger.warning("Failed to send actorupdate via mqtt: {}".format(e))

    async def _sensorupdate(self, message):
            try:
                self.sensor=self.sensorcontroller.get_state()
                for item in self.sensor['data']:
                    self.cbpi.push_update("cbpi/{}/{}".format("sensorupdate",item['id']), item)
            except Exception as e:
                self.logger.warning("Failed to send sensorupdate via mqtt: {}".format(e))

    def subscribe(self, topic, method):
        self.topic_filters.append((topic,method))
        return True
    
    def unsubscribe(self, topic, method):
        self.topic_filters.remove((topic,method))
        return True