import json

from sense_hat import SenseHat


class Sensors:
    def __init__(self, mqttc, uid, name):
        self.mqttc = mqttc
        self.sense = SenseHat()
        self.uid = uid
        self.name = name

        self.init_sensors()
        self.mqttc.will_set(self.availability_topic, "offline", retain=True)

    @property
    def device(self):
        return {
            "identifiers": [self.uid],
            "name": self.name,
        }

    @property
    def availability_topic(self):
        return f"{self.uid}/availability"

    @property
    def state_topic(self):
        return f"{self.uid}/state"

    def init_sensors(self):
        options = {
            "device": self.device,
            "availability_topic": self.availability_topic,
            "state_topic": self.state_topic,
            "entity_category": "diagnostic",
        }

        self.sensors = [
            TemperatureSensor(
                "Température",
                self.uid,
                "temperature",
                self.sense.get_temperature,
                **options,
            ),
            HumiditySensor(
                "Humidité", self.uid, "humidity", self.sense.get_humidity, **options
            ),
            PressureSensor(
                "Pression", self.uid, "pressure", self.sense.get_pressure, **options
            ),
        ]

    def publish_discovery(self):
        for sensor in self.sensors:
            sensor.publish_discovery(self.mqttc)

    def publish_online(self):
        self.mqttc.publish(self.availability_topic, "online", retain=True)

    def publish_state(self):
        self.mqttc.publish(
            self.state_topic,
            json.dumps({sensor.slug: sensor.get_value() for sensor in self.sensors}),
        )


class SingleSensor:
    def __init__(self, name, parent_uid, slug, get_value, **kwargs):
        self.name = name
        self.parent_uid = parent_uid
        self.slug = slug
        self.get_value = get_value
        self.options = kwargs

    def publish_discovery(self, mqttc):
        mqttc.publish(
            self.discovery_topic,
            json.dumps(
                {
                    "name": self.name,
                    "state_class": "MEASUREMENT",
                    "unique_id": self.uid,
                    "value_template": self.value_template,
                }
                | self.options
            ),
            retain=True,
        )

    @property
    def uid(self):
        return f"{self.parent_uid}_{self.slug}"

    @property
    def discovery_topic(self):
        return f"homeassistant/sensor/{self.uid}/config"

    @property
    def value_template(self):
        return "{{" + f"value_json.{self.slug}" + "}}"


class TemperatureSensor(SingleSensor):
    def __init__(self, name, parent_uid, slug, get_value, **kwargs):
        super().__init__(name, parent_uid, slug, get_value, **kwargs)
        self.options["device_class"] = "temperature"
        self.options["icon"] = "mdi:thermometer"
        self.options["suggested_display_precision"] = 1
        self.options["unit_of_measurement"] = "°C"


class HumiditySensor(SingleSensor):
    def __init__(self, name, parent_uid, slug, get_value, **kwargs):
        super().__init__(name, parent_uid, slug, get_value, **kwargs)
        self.options["device_class"] = "humidity"
        self.options["icon"] = "mdi:water-percent"
        self.options["suggested_display_precision"] = 0
        self.options["unit_of_measurement"] = "%"


class PressureSensor(SingleSensor):
    def __init__(self, name, parent_uid, slug, get_value, **kwargs):
        super().__init__(name, parent_uid, slug, get_value, **kwargs)
        self.options["device_class"] = "pressure"
        self.options["icon"] = "mdi:gauge"
        self.options["suggested_display_precision"] = 0
        self.options["unit_of_measurement"] = "mbar"