#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
from base import mqtt_base
from base import videv_base
import json
import time


def is_json(data):
    try:
        json.loads(data)
    except json.decoder.JSONDecodeError:
        return False
    else:
        return True


class base(mqtt_base):
    TX_TOPIC = "set"
    TX_VALUE = 0
    TX_DICT = 1
    TX_TYPE = -1
    TX_FILTER_DATA_KEYS = []
    #
    RX_KEYS = []
    RX_IGNORE_TOPICS = []
    RX_IGNORE_KEYS = []
    RX_FILTER_DATA_KEYS = []

    def __init__(self, mqtt_client, topic):
        super().__init__(mqtt_client, topic, default_values=dict.fromkeys(self.RX_KEYS))
        # data storage
        # initialisations
        mqtt_client.add_callback(topic=self.topic, callback=self.receive_callback)
        mqtt_client.add_callback(topic=self.topic+"/#", callback=self.receive_callback)
        #
        self.add_callback(None, None, self.__state_logging__, on_change_only=True)

    def set(self, key, data, block_callback=[]):
        if key in self.RX_IGNORE_KEYS:
            pass    # ignore these keys
        elif key in self.RX_KEYS:
            return super().set(key, data, block_callback)
        else:
            self.logger.warning("Unexpected key %s", key)

    def receive_callback(self, client, userdata, message):
        if message.topic != self.topic + '/' + videv_base.KEY_INFO:
            content_key = message.topic[len(self.topic) + 1:]
            if content_key not in self.RX_IGNORE_TOPICS and (not message.topic.endswith(self.TX_TOPIC) or len(self.TX_TOPIC) == 0):
                self.logger.debug("Unpacking content_key \"%s\" from message.", content_key)
                if is_json(message.payload):
                    data = json.loads(message.payload)
                    if type(data) is dict:
                        for key in data:
                            self.set(key, self.__device_to_instance_filter__(key, data[key]))
                    else:
                        self.set(content_key, self.__device_to_instance_filter__(content_key, data))
                # String
                else:
                    self.set(content_key, self.__device_to_instance_filter__(content_key, message.payload.decode('utf-8')))
            else:
                self.logger.debug("Ignoring topic %s", content_key)

    def __device_to_instance_filter__(self, key, data):
        if key in self.RX_FILTER_DATA_KEYS:
            if data in [1, 'on', 'ON']:
                return True
            elif data in [0, 'off', 'OFF']:
                return False
        return data

    def __instance_to_device_filter__(self, key, data):
        if key in self.TX_FILTER_DATA_KEYS:
            if data is True:
                return "on"
            elif data is False:
                return "off"
        return data

    def send_command(self, key, data):
        data = self.__instance_to_device_filter__(key, data)
        if self.TX_TOPIC is not None:
            if self.TX_TYPE < 0:
                self.logger.error("Unknown tx type. Set TX_TYPE of class to a known value")
            else:
                self.logger.debug("Sending data for %s - %s", key, str(data))
                if self.TX_TYPE == self.TX_DICT:
                    try:
                        self.mqtt_client.send('/'.join([self.topic, self.TX_TOPIC]), json.dumps({key: data}))
                    except TypeError:
                        print(self.topic)
                        print(key.__dict__)
                        print(key)
                        print(data)
                        raise TypeError
                else:
                    if type(data) not in [str, bytes]:
                        data = json.dumps(data)
                    self.mqtt_client.send('/'.join([self.topic, key, self.TX_TOPIC] if len(self.TX_TOPIC) > 0 else [self.topic, key]), data)
        else:
            self.logger.error("Unknown tx toptic. Set TX_TOPIC of class to a known value")