"""Support for AdGuard Home sensors."""
from __future__ import annotations

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

from adguardhome import AdGuardHome, AdGuardHomeConnectionError

from homeassistant.components.sensor import (
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import PERCENTAGE, UnitOfTime
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import PlatformNotReady
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from .const import DATA_ADGUARD_CLIENT, DATA_ADGUARD_VERSION, DOMAIN
from .entity import AdGuardHomeEntity

SCAN_INTERVAL = timedelta(seconds=300)
PARALLEL_UPDATES = 4


@dataclass
class AdGuardHomeEntityDescriptionMixin:
    """Mixin for required keys."""

    value_fn: Callable[[AdGuardHome], Coroutine[Any, Any, int | float]]


@dataclass
class AdGuardHomeEntityDescription(
    SensorEntityDescription, AdGuardHomeEntityDescriptionMixin
):
    """Describes AdGuard Home sensor entity."""


SENSORS: tuple[AdGuardHomeEntityDescription, ...] = (
    AdGuardHomeEntityDescription(
        key="dns_queries",
        translation_key="dns_queries",
        icon="mdi:magnify",
        native_unit_of_measurement="queries",
        value_fn=lambda adguard: adguard.stats.dns_queries(),
        state_class=SensorStateClass.TOTAL,
    ),
    AdGuardHomeEntityDescription(
        key="blocked_filtering",
        translation_key="dns_queries_blocked",
        icon="mdi:magnify-close",
        native_unit_of_measurement="queries",
        value_fn=lambda adguard: adguard.stats.blocked_filtering(),
        state_class=SensorStateClass.TOTAL,
    ),
    AdGuardHomeEntityDescription(
        key="blocked_percentage",
        translation_key="dns_queries_blocked_ratio",
        icon="mdi:magnify-close",
        native_unit_of_measurement=PERCENTAGE,
        value_fn=lambda adguard: adguard.stats.blocked_percentage(),
        state_class=SensorStateClass.MEASUREMENT,
    ),
    AdGuardHomeEntityDescription(
        key="blocked_parental",
        translation_key="parental_control_blocked",
        icon="mdi:human-male-girl",
        native_unit_of_measurement="requests",
        value_fn=lambda adguard: adguard.stats.replaced_parental(),
        state_class=SensorStateClass.TOTAL,
    ),
    AdGuardHomeEntityDescription(
        key="blocked_safebrowsing",
        translation_key="safe_browsing_blocked",
        icon="mdi:shield-half-full",
        native_unit_of_measurement="requests",
        value_fn=lambda adguard: adguard.stats.replaced_safebrowsing(),
        state_class=SensorStateClass.TOTAL,
    ),
    AdGuardHomeEntityDescription(
        key="enforced_safesearch",
        translation_key="safe_searches_enforced",
        icon="mdi:shield-search",
        native_unit_of_measurement="requests",
        value_fn=lambda adguard: adguard.stats.replaced_safesearch(),
        state_class=SensorStateClass.TOTAL,
    ),
    AdGuardHomeEntityDescription(
        key="average_speed",
        translation_key="average_processing_speed",
        icon="mdi:speedometer",
        native_unit_of_measurement=UnitOfTime.MILLISECONDS,
        value_fn=lambda adguard: adguard.stats.avg_processing_time(),
        state_class=SensorStateClass.MEASUREMENT,
    ),
    AdGuardHomeEntityDescription(
        key="rules_count",
        translation_key="rules_count",
        icon="mdi:counter",
        native_unit_of_measurement="rules",
        value_fn=lambda adguard: adguard.filtering.rules_count(allowlist=False),
        entity_registry_enabled_default=False,
        state_class=SensorStateClass.MEASUREMENT,
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up AdGuard Home sensor based on a config entry."""
    adguard = hass.data[DOMAIN][entry.entry_id][DATA_ADGUARD_CLIENT]

    try:
        version = await adguard.version()
    except AdGuardHomeConnectionError as exception:
        raise PlatformNotReady from exception

    hass.data[DOMAIN][entry.entry_id][DATA_ADGUARD_VERSION] = version

    async_add_entities(
        [AdGuardHomeSensor(adguard, entry, description) for description in SENSORS],
        True,
    )


class AdGuardHomeSensor(AdGuardHomeEntity, SensorEntity):
    """Defines a AdGuard Home sensor."""

    entity_description: AdGuardHomeEntityDescription

    def __init__(
        self,
        adguard: AdGuardHome,
        entry: ConfigEntry,
        description: AdGuardHomeEntityDescription,
    ) -> None:
        """Initialize AdGuard Home sensor."""
        super().__init__(adguard, entry)
        self.entity_description = description
        self._attr_unique_id = "_".join(
            [
                DOMAIN,
                adguard.host,
                str(adguard.port),
                "sensor",
                description.key,
            ]
        )

    async def _adguard_update(self) -> None:
        """Update AdGuard Home entity."""
        value = await self.entity_description.value_fn(self.adguard)
        self._attr_native_value = value
        if isinstance(value, float):
            self._attr_native_value = f"{value:.2f}"