"""Support for Z-Wave controls using the number platform."""
from __future__ import annotations

from zwave_js_server.client import Client as ZwaveClient

from homeassistant.components.number import DOMAIN as NUMBER_DOMAIN, NumberEntity
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers.dispatcher import async_dispatcher_connect
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from .const import DATA_CLIENT, DOMAIN
from .discovery import ZwaveDiscoveryInfo
from .entity import ZWaveBaseEntity


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up Z-Wave Number entity from Config Entry."""
    client: ZwaveClient = hass.data[DOMAIN][config_entry.entry_id][DATA_CLIENT]

    @callback
    def async_add_number(info: ZwaveDiscoveryInfo) -> None:
        """Add Z-Wave number entity."""
        entities: list[ZWaveBaseEntity] = []
        if info.platform_hint == "volume":
            entities.append(ZwaveVolumeNumberEntity(config_entry, client, info))
        else:
            entities.append(ZwaveNumberEntity(config_entry, client, info))
        async_add_entities(entities)

    config_entry.async_on_unload(
        async_dispatcher_connect(
            hass,
            f"{DOMAIN}_{config_entry.entry_id}_add_{NUMBER_DOMAIN}",
            async_add_number,
        )
    )


class ZwaveNumberEntity(ZWaveBaseEntity, NumberEntity):
    """Representation of a Z-Wave number entity."""

    def __init__(
        self, config_entry: ConfigEntry, client: ZwaveClient, info: ZwaveDiscoveryInfo
    ) -> None:
        """Initialize a ZwaveNumberEntity entity."""
        super().__init__(config_entry, client, info)
        if self.info.primary_value.metadata.writeable:
            self._target_value = self.info.primary_value
        else:
            self._target_value = self.get_zwave_value("targetValue")

        # Entity class attributes
        self._attr_name = self.generate_name(
            include_value_name=True, alternate_value_name=info.platform_hint
        )

    @property
    def min_value(self) -> float:
        """Return the minimum value."""
        if self.info.primary_value.metadata.min is None:
            return 0
        return float(self.info.primary_value.metadata.min)

    @property
    def max_value(self) -> float:
        """Return the maximum value."""
        if self.info.primary_value.metadata.max is None:
            return 255
        return float(self.info.primary_value.metadata.max)

    @property
    def value(self) -> float | None:
        """Return the entity value."""
        if self.info.primary_value.value is None:
            return None
        return float(self.info.primary_value.value)

    @property
    def unit_of_measurement(self) -> str | None:
        """Return the unit of measurement of this entity, if any."""
        if self.info.primary_value.metadata.unit is None:
            return None
        return str(self.info.primary_value.metadata.unit)

    async def async_set_value(self, value: float) -> None:
        """Set new value."""
        await self.info.node.async_set_value(self._target_value, value)


class ZwaveVolumeNumberEntity(ZWaveBaseEntity, NumberEntity):
    """Representation of a volume number entity."""

    def __init__(
        self, config_entry: ConfigEntry, client: ZwaveClient, info: ZwaveDiscoveryInfo
    ) -> None:
        """Initialize a ZwaveVolumeNumberEntity entity."""
        super().__init__(config_entry, client, info)
        self.correction_factor = int(
            self.info.primary_value.metadata.max - self.info.primary_value.metadata.min
        )
        # Fallback in case we can't properly calculate correction factor
        if self.correction_factor == 0:
            self.correction_factor = 1

        # Entity class attributes
        self._attr_min_value = 0
        self._attr_max_value = 1
        self._attr_step = 0.01
        self._attr_name = self.generate_name(include_value_name=True)

    @property
    def value(self) -> float | None:
        """Return the entity value."""
        if self.info.primary_value.value is None:
            return None
        return float(self.info.primary_value.value) / self.correction_factor

    async def async_set_value(self, value: float) -> None:
        """Set new value."""
        await self.info.node.async_set_value(
            self.info.primary_value, round(value * self.correction_factor)
        )
