"""Sensor platform for Solar of Things integration."""
from __future__ import annotations

import logging

from homeassistant.components.sensor import SensorEntity, SensorDeviceClass, SensorStateClass
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    PERCENTAGE,
    UnitOfElectricCurrent,
    UnitOfElectricPotential,
    UnitOfEnergy,
    UnitOfPower,
)
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.update_coordinator import CoordinatorEntity

from .const import DOMAIN, SENSOR_DEFINITIONS

_LOGGER = logging.getLogger(__name__)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up Solar of Things sensors."""

    data = hass.data[DOMAIN][entry.entry_id]
    station_id: str = data["station_id"]
    device_coordinators = data["device_coordinators"]
    station_coordinator = data["station_coordinator"]

    entities: list[SensorEntity] = []

    # Per-device sensors
    for device_id, coordinator in device_coordinators.items():
        device_name = (coordinator.device_meta or {}).get("name") or device_id

        for key, definition in SENSOR_DEFINITIONS.items():
            if key.startswith("monthly_"):
                continue

            entities.append(
                SolarOfThingsDeviceSensor(
                    coordinator=coordinator,
                    station_id=station_id,
                    device_id=device_id,
                    device_name=device_name,
                    sensor_key=key,
                    sensor_definition=definition,
                )
            )

    # Station-level monthly sensors
    if station_coordinator:
        for key, definition in SENSOR_DEFINITIONS.items():
            if not key.startswith("monthly_"):
                continue

            entities.append(
                SolarOfThingsStationMonthlySensor(
                    coordinator=station_coordinator,
                    station_id=station_id,
                    sensor_key=key,
                    sensor_definition=definition,
                )
            )

    async_add_entities(entities)


class SolarOfThingsDeviceSensor(CoordinatorEntity, SensorEntity):
    """Per-device telemetry sensor."""

    def __init__(
        self,
        coordinator,
        station_id: str,
        device_id: str,
        device_name: str,
        sensor_key: str,
        sensor_definition: dict,
    ) -> None:
        super().__init__(coordinator)

        self._station_id = station_id
        self._device_id = device_id
        self._device_name = device_name
        self._sensor_key = sensor_key
        self._sensor_definition = sensor_definition

        self._attr_name = f"{device_name} {sensor_definition['name']}"
        self._attr_unique_id = f"{DOMAIN}_{station_id}_{device_id}_{sensor_key}"
        self._attr_icon = sensor_definition.get("icon")

        unit = sensor_definition.get("unit")
        if unit == "W":
            self._attr_device_class = SensorDeviceClass.POWER
            self._attr_native_unit_of_measurement = UnitOfPower.WATT
            self._attr_state_class = SensorStateClass.MEASUREMENT
        elif unit == "kWh":
            self._attr_device_class = SensorDeviceClass.ENERGY
            self._attr_native_unit_of_measurement = UnitOfEnergy.KILO_WATT_HOUR
            self._attr_state_class = SensorStateClass.TOTAL_INCREASING
        elif unit == "A":
            self._attr_device_class = SensorDeviceClass.CURRENT
            self._attr_native_unit_of_measurement = UnitOfElectricCurrent.AMPERE
            self._attr_state_class = SensorStateClass.MEASUREMENT
        elif unit == "V":
            self._attr_device_class = SensorDeviceClass.VOLTAGE
            self._attr_native_unit_of_measurement = UnitOfElectricPotential.VOLT
            self._attr_state_class = SensorStateClass.MEASUREMENT
        elif unit == "%":
            if "battery" in sensor_key.lower():
                self._attr_device_class = SensorDeviceClass.BATTERY
            self._attr_native_unit_of_measurement = PERCENTAGE
            self._attr_state_class = SensorStateClass.MEASUREMENT

    @property
    def device_info(self):
        return {
            "identifiers": {(DOMAIN, self._station_id, self._device_id)},
            "name": self._device_name,
            "manufacturer": "Siseli",
            "model": (self.coordinator.data.get("device_meta") or {}).get("model") if self.coordinator.data else None,
            "via_device": (DOMAIN, self._station_id),
        }

    @property
    def native_value(self):
        ts = (self.coordinator.data or {}).get("time_series") or {}
        val = ts.get(self._sensor_key)
        if val is None:
            return None
        try:
            return round(float(val), 2)
        except Exception:
            return None


class SolarOfThingsStationMonthlySensor(CoordinatorEntity, SensorEntity):
    """Station-level monthly summary sensor."""

    def __init__(
        self,
        coordinator,
        station_id: str,
        sensor_key: str,
        sensor_definition: dict,
    ) -> None:
        super().__init__(coordinator)

        self._station_id = station_id
        self._sensor_key = sensor_key
        self._sensor_definition = sensor_definition

        self._attr_name = f"Station {station_id} {sensor_definition['name']}"
        self._attr_unique_id = f"{DOMAIN}_{station_id}_{sensor_key}"
        self._attr_icon = sensor_definition.get("icon")

        unit = sensor_definition.get("unit")
        if unit == "kWh":
            self._attr_device_class = SensorDeviceClass.ENERGY
            self._attr_native_unit_of_measurement = UnitOfEnergy.KILO_WATT_HOUR
            self._attr_state_class = SensorStateClass.TOTAL
        elif unit == "%":
            self._attr_native_unit_of_measurement = PERCENTAGE
            self._attr_state_class = SensorStateClass.MEASUREMENT

    @property
    def device_info(self):
        return {
            "identifiers": {(DOMAIN, self._station_id)},
            "name": f"Solar Station {self._station_id}",
            "manufacturer": "Siseli",
            "model": "Station",
        }

    @property
    def native_value(self):
        monthly = (self.coordinator.data or {}).get("monthly") or {}
        val = monthly.get(self._sensor_key)
        if val is None:
            return None
        try:
            return round(float(val), 2)
        except Exception:
            return None