from datetime import timedelta, datetime, date
import logging

import async_timeout

from homeassistant.util import dt as dt_util
from homeassistant.components.sensor import SensorEntity
from homeassistant.helpers.entity import EntityCategory
from homeassistant.helpers.update_coordinator import (
    CoordinatorEntity,
)

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorStateClass,
)

from .const import (
    DOMAIN,
    SOLAR_ICON,
    FREQ_ICON,
    SIGNAL_ICON
)

from homeassistant.const import (
    UnitOfPower,
    UnitOfEnergy,
    UnitOfTemperature,
    UnitOfElectricPotential,
    UnitOfFrequency,
    PERCENTAGE
)


_LOGGER = logging.getLogger(__name__)

async def async_setup_entry(hass, config, add_entities, discovery_info=None):

    ecu = hass.data[DOMAIN].get("ecu")
    coordinator = hass.data[DOMAIN].get("coordinator")

    sensors = [
        APSystemsECUSensor(coordinator, ecu, "current_power", 
            label="Current Power",
            unit=UnitOfPower.WATT,
            devclass=SensorDeviceClass.POWER,
            icon=SOLAR_ICON,
            stateclass=SensorStateClass.MEASUREMENT
        ),
        APSystemsECUSensor(coordinator, ecu, "today_energy", 
            label="Today Energy",
            unit=UnitOfEnergy.KILO_WATT_HOUR,
            devclass=SensorDeviceClass.ENERGY,
            icon=SOLAR_ICON,
            stateclass=SensorStateClass.TOTAL_INCREASING
        ),
        APSystemsECUSensor(coordinator, ecu, "lifetime_energy", 
            label="Lifetime Energy",
            unit=UnitOfEnergy.KILO_WATT_HOUR,
            devclass=SensorDeviceClass.ENERGY,
            icon=SOLAR_ICON,
            stateclass=SensorStateClass.TOTAL_INCREASING
        ),
        APSystemsECUSensor(coordinator, ecu, "qty_of_inverters", 
            label="Inverters",
            icon=SOLAR_ICON,
            entity_category=EntityCategory.DIAGNOSTIC
        ),
        APSystemsECUSensor(coordinator, ecu, "qty_of_online_inverters", 
            label="Inverters Online",
            icon=SOLAR_ICON,
            entity_category=EntityCategory.DIAGNOSTIC
        ),
    ]

    inverters = coordinator.data.get("inverters", {})
    for uid,inv_data in inverters.items():
        _LOGGER.debug(f"Inverter {uid} {inv_data.get('channel_qty')}")
        # https://github.com/ksheumaker/homeassistant-apsystems_ecur/issues/110
        if inv_data.get("channel_qty") != None:
            sensors.extend([
                    APSystemsECUInverterSensor(coordinator, ecu, uid, "temperature",
                        label="Temperature",
                        unit=UnitOfTemperature.CELSIUS,
                        devclass=SensorDeviceClass.TEMPERATURE,
                        stateclass=SensorStateClass.MEASUREMENT,
                        entity_category=EntityCategory.DIAGNOSTIC
                    ),
                    APSystemsECUInverterSensor(coordinator, ecu, uid, "frequency",
                        label="Frequency",
                        unit=UnitOfFrequency.HERTZ,
                        stateclass=SensorStateClass.MEASUREMENT,
                        devclass=SensorDeviceClass.FREQUENCY,
                        icon=FREQ_ICON,
                        entity_category=EntityCategory.DIAGNOSTIC
                    ),
                    APSystemsECUInverterSensor(coordinator, ecu, uid, "voltage",
                        label="Voltage",
                        unit=UnitOfElectricPotential.VOLT,
                        stateclass=SensorStateClass.MEASUREMENT,
                        devclass=SensorDeviceClass.VOLTAGE, entity_category=EntityCategory.DIAGNOSTIC
                    ),
                    APSystemsECUInverterSensor(coordinator, ecu, uid, "signal",
                        label="Signal",
                        unit=PERCENTAGE,
                        stateclass=SensorStateClass.MEASUREMENT,
                        devclass=SensorDeviceClass.SIGNAL_STRENGTH,
                        icon=SIGNAL_ICON,
                        entity_category=EntityCategory.DIAGNOSTIC
                    )
            ])
            for i in range(0, inv_data.get("channel_qty", 0)):
                sensors.append(
                    APSystemsECUInverterSensor(coordinator, ecu, uid, f"power", 
                        index=i, label=f"Power Ch {i+1}",
                        unit=UnitOfPower.WATT,
                        devclass=SensorDeviceClass.POWER,
                        icon=SOLAR_ICON,
                        stateclass=SensorStateClass.MEASUREMENT
                    )
                )
    add_entities(sensors)


class APSystemsECUInverterSensor(CoordinatorEntity, SensorEntity):
    def __init__(self, coordinator, ecu, uid, field, index=0, label=None, icon=None, unit=None, devclass=None, stateclass=None, entity_category=None):

        super().__init__(coordinator)

        self.coordinator = coordinator

        self._index = index
        self._uid = uid
        self._ecu = ecu
        self._field = field
        self._devclass = devclass
        self._label = label
        if not label:
            self._label = field
        self._icon = icon
        self._unit = unit
        self._stateclass = stateclass
        self._entity_category = entity_category

        self._name = f"Inverter {self._uid} {self._label}"
        self._state = None

    @property
    def unique_id(self):
        field = self._field
        if self._index != None:
            field = f"{field}_{self._index}"
        return f"{self._ecu.ecu.ecu_id}_{self._uid}_{field}"

    @property
    def device_class(self):
        return self._devclass

    @property
    def name(self):
        return self._name

    @property
    def state(self):
        _LOGGER.debug(f"State called for {self._field}")
        if self._field == "voltage":
            return self.coordinator.data.get("inverters", {}).get(self._uid, {}).get("voltage", [])[0]
        elif self._field == "power":
            _LOGGER.debug(f"POWER  {self._uid} {self._index}")
            return self.coordinator.data.get("inverters", {}).get(self._uid, {}).get("power", [])[self._index]
        else:
            return self.coordinator.data.get("inverters", {}).get(self._uid, {}).get(self._field)

    @property
    def icon(self):
        return self._icon

    @property
    def unit_of_measurement(self):
        return self._unit


    @property
    def extra_state_attributes(self):
        attrs = {
            "ecu_id" : self._ecu.ecu.ecu_id,
            "inverter_uid" : self._uid,
            "last_update" : self._ecu.ecu.last_update,
        }
        return attrs

    @property
    def state_class(self):
        _LOGGER.debug(f"State class {self._stateclass} - {self._field}")
        return self._stateclass

    @property
    def device_info(self):
        parent = f"inverter_{self._uid}"
        return {
            "identifiers": {
                (DOMAIN, parent),
            }
        }
   
    @property
    def entity_category(self):
        return self._entity_category

class APSystemsECUSensor(CoordinatorEntity, SensorEntity):

    def __init__(self, coordinator, ecu, field, label=None, icon=None, unit=None, devclass=None, stateclass=None, entity_category=None):

        super().__init__(coordinator)

        self.coordinator = coordinator

        self._ecu = ecu
        self._field = field
        self._label = label
        if not label:
            self._label = field
        self._icon = icon
        self._unit = unit
        self._devclass = devclass
        self._stateclass = stateclass
        self._entity_category = entity_category

        self._name = f"ECU {self._label}"
        self._state = None

    @property
    def unique_id(self):
        return f"{self._ecu.ecu.ecu_id}_{self._field}"

    @property
    def name(self):
        return self._name

    @property
    def device_class(self):
        return self._devclass

    @property
    def state(self):
        _LOGGER.debug(f"State called for {self._field}")
        return self.coordinator.data.get(self._field)

    @property
    def icon(self):
        return self._icon

    @property
    def unit_of_measurement(self):
        return self._unit

    @property
    def extra_state_attributes(self):

        attrs = {
            "ecu_id" : self._ecu.ecu.ecu_id,
            "Firmware" : self._ecu.ecu.firmware,
            "Timezone" : self._ecu.ecu.timezone,
            "last_update" : self._ecu.ecu.last_update
        }
        return attrs

    @property
    def state_class(self):
        _LOGGER.debug(f"State class {self._stateclass} - {self._field}")
        return self._stateclass

    @property
    def device_info(self):
        parent = f"ecu_{self._ecu.ecu.ecu_id}"
        return {
            "identifiers": {
                (DOMAIN, parent),
            }
        }
     
    @property
    def entity_category(self):
        return self._entity_category