"""Sensor platform for UniFi Network integration.

Support for bandwidth sensors of network clients.
Support for uptime sensors of network clients.
"""
from __future__ import annotations

from collections.abc import Callable
from dataclasses import dataclass
from datetime import datetime, timedelta
from typing import Generic

from aiounifi.interfaces.api_handlers import ItemEvent
from aiounifi.interfaces.clients import Clients
from aiounifi.interfaces.devices import Devices
from aiounifi.interfaces.outlets import Outlets
from aiounifi.interfaces.ports import Ports
from aiounifi.interfaces.wlans import Wlans
from aiounifi.models.api import ApiItemT
from aiounifi.models.client import Client
from aiounifi.models.device import Device
from aiounifi.models.outlet import Outlet
from aiounifi.models.port import Port
from aiounifi.models.wlan import Wlan

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    UnitOfTemperature,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import EntityCategory, UnitOfInformation, UnitOfPower
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers.entity_platform import AddEntitiesCallback
import homeassistant.util.dt as dt_util

from .controller import UniFiController
from .entity import (
    HandlerT,
    UnifiEntity,
    UnifiEntityDescription,
    async_client_device_info_fn,
    async_device_available_fn,
    async_device_device_info_fn,
    async_wlan_available_fn,
    async_wlan_device_info_fn,
)


@callback
def async_client_rx_value_fn(controller: UniFiController, client: Client) -> float:
    """Calculate receiving data transfer value."""
    if controller.wireless_clients.is_wireless(client):
        return client.rx_bytes_r / 1000000
    return client.wired_rx_bytes_r / 1000000


@callback
def async_client_tx_value_fn(controller: UniFiController, client: Client) -> float:
    """Calculate transmission data transfer value."""
    if controller.wireless_clients.is_wireless(client):
        return client.tx_bytes_r / 1000000
    return client.wired_tx_bytes_r / 1000000


@callback
def async_client_uptime_value_fn(
    controller: UniFiController, client: Client
) -> datetime:
    """Calculate the uptime of the client."""
    if client.uptime < 1000000000:
        return dt_util.now() - timedelta(seconds=client.uptime)
    return dt_util.utc_from_timestamp(float(client.uptime))


@callback
def async_wlan_client_value_fn(controller: UniFiController, wlan: Wlan) -> int:
    """Calculate the amount of clients connected to a wlan."""
    return len(
        [
            client.mac
            for client in controller.api.clients.values()
            if client.essid == wlan.name
            and dt_util.utcnow() - dt_util.utc_from_timestamp(client.last_seen or 0)
            < controller.option_detection_time
        ]
    )


@callback
def async_device_uptime_value_fn(
    controller: UniFiController, device: Device
) -> datetime:
    """Calculate the uptime of the device."""
    return (dt_util.now() - timedelta(seconds=device.uptime)).replace(
        second=0, microsecond=0
    )


@callback
def async_device_outlet_power_supported_fn(
    controller: UniFiController, obj_id: str
) -> bool:
    """Determine if an outlet has the power property."""
    # At this time, an outlet_caps value of 3 is expected to indicate that the outlet
    # supports metering
    return controller.api.outlets[obj_id].caps == 3


@callback
def async_device_outlet_supported_fn(controller: UniFiController, obj_id: str) -> bool:
    """Determine if a device supports reading overall power metrics."""
    return controller.api.devices[obj_id].outlet_ac_power_budget is not None


@dataclass
class UnifiSensorEntityDescriptionMixin(Generic[HandlerT, ApiItemT]):
    """Validate and load entities from different UniFi handlers."""

    value_fn: Callable[[UniFiController, ApiItemT], datetime | float | str | None]


@dataclass
class UnifiSensorEntityDescription(
    SensorEntityDescription,
    UnifiEntityDescription[HandlerT, ApiItemT],
    UnifiSensorEntityDescriptionMixin[HandlerT, ApiItemT],
):
    """Class describing UniFi sensor entity."""


ENTITY_DESCRIPTIONS: tuple[UnifiSensorEntityDescription, ...] = (
    UnifiSensorEntityDescription[Clients, Client](
        key="Bandwidth sensor RX",
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfInformation.MEGABYTES,
        has_entity_name=True,
        allowed_fn=lambda controller, _: controller.option_allow_bandwidth_sensors,
        api_handler_fn=lambda api: api.clients,
        available_fn=lambda controller, _: controller.available,
        device_info_fn=async_client_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda _: "RX",
        object_fn=lambda api, obj_id: api.clients[obj_id],
        should_poll=False,
        supported_fn=lambda controller, _: controller.option_allow_bandwidth_sensors,
        unique_id_fn=lambda controller, obj_id: f"rx-{obj_id}",
        value_fn=async_client_rx_value_fn,
    ),
    UnifiSensorEntityDescription[Clients, Client](
        key="Bandwidth sensor TX",
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfInformation.MEGABYTES,
        has_entity_name=True,
        allowed_fn=lambda controller, _: controller.option_allow_bandwidth_sensors,
        api_handler_fn=lambda api: api.clients,
        available_fn=lambda controller, _: controller.available,
        device_info_fn=async_client_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda _: "TX",
        object_fn=lambda api, obj_id: api.clients[obj_id],
        should_poll=False,
        supported_fn=lambda controller, _: controller.option_allow_bandwidth_sensors,
        unique_id_fn=lambda controller, obj_id: f"tx-{obj_id}",
        value_fn=async_client_tx_value_fn,
    ),
    UnifiSensorEntityDescription[Ports, Port](
        key="PoE port power sensor",
        device_class=SensorDeviceClass.POWER,
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfPower.WATT,
        has_entity_name=True,
        entity_registry_enabled_default=False,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.ports,
        available_fn=async_device_available_fn,
        device_info_fn=async_device_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda port: f"{port.name} PoE Power",
        object_fn=lambda api, obj_id: api.ports[obj_id],
        should_poll=False,
        supported_fn=lambda controller, obj_id: controller.api.ports[obj_id].port_poe,
        unique_id_fn=lambda controller, obj_id: f"poe_power-{obj_id}",
        value_fn=lambda _, obj: obj.poe_power if obj.poe_mode != "off" else "0",
    ),
    UnifiSensorEntityDescription[Clients, Client](
        key="Client uptime",
        device_class=SensorDeviceClass.TIMESTAMP,
        entity_category=EntityCategory.DIAGNOSTIC,
        has_entity_name=True,
        entity_registry_enabled_default=False,
        allowed_fn=lambda controller, _: controller.option_allow_uptime_sensors,
        api_handler_fn=lambda api: api.clients,
        available_fn=lambda controller, obj_id: controller.available,
        device_info_fn=async_client_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda client: "Uptime",
        object_fn=lambda api, obj_id: api.clients[obj_id],
        should_poll=False,
        supported_fn=lambda controller, _: controller.option_allow_uptime_sensors,
        unique_id_fn=lambda controller, obj_id: f"uptime-{obj_id}",
        value_fn=async_client_uptime_value_fn,
    ),
    UnifiSensorEntityDescription[Wlans, Wlan](
        key="WLAN clients",
        entity_category=EntityCategory.DIAGNOSTIC,
        has_entity_name=True,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.wlans,
        available_fn=async_wlan_available_fn,
        device_info_fn=async_wlan_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda wlan: None,
        object_fn=lambda api, obj_id: api.wlans[obj_id],
        should_poll=True,
        supported_fn=lambda controller, obj_id: True,
        unique_id_fn=lambda controller, obj_id: f"wlan_clients-{obj_id}",
        value_fn=async_wlan_client_value_fn,
    ),
    UnifiSensorEntityDescription[Outlets, Outlet](
        key="Outlet power metering",
        device_class=SensorDeviceClass.POWER,
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfPower.WATT,
        has_entity_name=True,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.outlets,
        available_fn=async_device_available_fn,
        device_info_fn=async_device_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda outlet: f"{outlet.name} Outlet Power",
        object_fn=lambda api, obj_id: api.outlets[obj_id],
        should_poll=True,
        supported_fn=async_device_outlet_power_supported_fn,
        unique_id_fn=lambda controller, obj_id: f"outlet_power-{obj_id}",
        value_fn=lambda _, obj: obj.power if obj.relay_state else "0",
    ),
    UnifiSensorEntityDescription[Devices, Device](
        key="SmartPower AC power budget",
        device_class=SensorDeviceClass.POWER,
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfPower.WATT,
        suggested_display_precision=1,
        has_entity_name=True,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.devices,
        available_fn=async_device_available_fn,
        device_info_fn=async_device_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda device: "AC Power Budget",
        object_fn=lambda api, obj_id: api.devices[obj_id],
        should_poll=False,
        supported_fn=async_device_outlet_supported_fn,
        unique_id_fn=lambda controller, obj_id: f"ac_power_budget-{obj_id}",
        value_fn=lambda controller, device: device.outlet_ac_power_budget,
    ),
    UnifiSensorEntityDescription[Devices, Device](
        key="SmartPower AC power consumption",
        device_class=SensorDeviceClass.POWER,
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfPower.WATT,
        suggested_display_precision=1,
        has_entity_name=True,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.devices,
        available_fn=async_device_available_fn,
        device_info_fn=async_device_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda device: "AC Power Consumption",
        object_fn=lambda api, obj_id: api.devices[obj_id],
        should_poll=False,
        supported_fn=async_device_outlet_supported_fn,
        unique_id_fn=lambda controller, obj_id: f"ac_power_conumption-{obj_id}",
        value_fn=lambda controller, device: device.outlet_ac_power_consumption,
    ),
    UnifiSensorEntityDescription[Devices, Device](
        key="Device uptime",
        device_class=SensorDeviceClass.TIMESTAMP,
        entity_category=EntityCategory.DIAGNOSTIC,
        has_entity_name=True,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.devices,
        available_fn=async_device_available_fn,
        device_info_fn=async_device_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda device: "Uptime",
        object_fn=lambda api, obj_id: api.devices[obj_id],
        should_poll=False,
        supported_fn=lambda controller, obj_id: True,
        unique_id_fn=lambda controller, obj_id: f"device_uptime-{obj_id}",
        value_fn=async_device_uptime_value_fn,
    ),
    UnifiSensorEntityDescription[Devices, Device](
        key="Device temperature",
        device_class=SensorDeviceClass.TEMPERATURE,
        entity_category=EntityCategory.DIAGNOSTIC,
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        has_entity_name=True,
        allowed_fn=lambda controller, obj_id: True,
        api_handler_fn=lambda api: api.devices,
        available_fn=async_device_available_fn,
        device_info_fn=async_device_device_info_fn,
        event_is_on=None,
        event_to_subscribe=None,
        name_fn=lambda device: "Temperature",
        object_fn=lambda api, obj_id: api.devices[obj_id],
        should_poll=False,
        supported_fn=lambda ctrlr, obj_id: ctrlr.api.devices[obj_id].has_temperature,
        unique_id_fn=lambda controller, obj_id: f"device_temperature-{obj_id}",
        value_fn=lambda ctrlr, device: device.general_temperature,
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up sensors for UniFi Network integration."""
    UniFiController.register_platform(
        hass, config_entry, async_add_entities, UnifiSensorEntity, ENTITY_DESCRIPTIONS
    )


class UnifiSensorEntity(UnifiEntity[HandlerT, ApiItemT], SensorEntity):
    """Base representation of a UniFi sensor."""

    entity_description: UnifiSensorEntityDescription[HandlerT, ApiItemT]

    @callback
    def async_update_state(self, event: ItemEvent, obj_id: str) -> None:
        """Update entity state.

        Update native_value.
        """
        description = self.entity_description
        obj = description.object_fn(self.controller.api, self._obj_id)
        if (value := description.value_fn(self.controller, obj)) != self.native_value:
            self._attr_native_value = value