"""Support for Lidarr."""
from __future__ import annotations

from collections.abc import Callable
from copy import deepcopy
from dataclasses import dataclass
from typing import Any, Generic

from aiopyarr import LidarrQueue, LidarrQueueItem, LidarrRootFolder

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import UnitOfInformation
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from . import LidarrEntity
from .const import BYTE_SIZES, DOMAIN
from .coordinator import LidarrDataUpdateCoordinator, T


def get_space(data: list[LidarrRootFolder], name: str) -> str:
    """Get space."""
    space: list[float] = []
    for mount in data:
        if name in mount.path:
            mount.freeSpace = mount.freeSpace if mount.accessible else 0
            space.append(
                mount.freeSpace / 1024 ** BYTE_SIZES.index(UnitOfInformation.GIGABYTES)
            )
    return f"{space[0]:.2f}"


def get_modified_description(
    description: LidarrSensorEntityDescription[T], mount: LidarrRootFolder
) -> tuple[LidarrSensorEntityDescription[T], str]:
    """Return modified description and folder name."""
    desc = deepcopy(description)
    name = mount.path.rsplit("/")[-1].rsplit("\\")[-1]
    desc.key = f"{description.key}_{name}"
    desc.name = f"{description.name} {name}".capitalize()
    return desc, name


@dataclass
class LidarrSensorEntityDescriptionMixIn(Generic[T]):
    """Mixin for required keys."""

    value_fn: Callable[[T, str], str | int]


@dataclass
class LidarrSensorEntityDescription(
    SensorEntityDescription, LidarrSensorEntityDescriptionMixIn[T], Generic[T]
):
    """Class to describe a Lidarr sensor."""

    attributes_fn: Callable[[T], dict[str, str] | None] = lambda _: None
    description_fn: Callable[
        [LidarrSensorEntityDescription[T], LidarrRootFolder],
        tuple[LidarrSensorEntityDescription[T], str] | None,
    ] | None = None


SENSOR_TYPES: dict[str, LidarrSensorEntityDescription[Any]] = {
    "disk_space": LidarrSensorEntityDescription(
        key="disk_space",
        name="Disk space",
        native_unit_of_measurement=UnitOfInformation.GIGABYTES,
        device_class=SensorDeviceClass.DATA_SIZE,
        icon="mdi:harddisk",
        value_fn=get_space,
        state_class=SensorStateClass.TOTAL,
        description_fn=get_modified_description,
    ),
    "queue": LidarrSensorEntityDescription[LidarrQueue](
        key="queue",
        name="Queue",
        native_unit_of_measurement="Albums",
        icon="mdi:download",
        value_fn=lambda data, _: data.totalRecords,
        state_class=SensorStateClass.TOTAL,
        attributes_fn=lambda data: {i.title: queue_str(i) for i in data.records},
    ),
    "wanted": LidarrSensorEntityDescription[LidarrQueue](
        key="wanted",
        name="Wanted",
        native_unit_of_measurement="Albums",
        icon="mdi:music",
        value_fn=lambda data, _: data.totalRecords,
        state_class=SensorStateClass.TOTAL,
        entity_registry_enabled_default=False,
        attributes_fn=lambda data: {
            album.title: album.artist.artistName for album in data.records
        },
    ),
}


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up Lidarr sensors based on a config entry."""
    coordinators: dict[str, LidarrDataUpdateCoordinator[Any]] = hass.data[DOMAIN][
        entry.entry_id
    ]
    entities: list[LidarrSensor[Any]] = []
    for coordinator_type, description in SENSOR_TYPES.items():
        coordinator = coordinators[coordinator_type]
        if coordinator_type != "disk_space":
            entities.append(LidarrSensor(coordinator, description))
        else:
            entities.extend(
                LidarrSensor(coordinator, *get_modified_description(description, mount))
                for mount in coordinator.data
                if description.description_fn
            )
    async_add_entities(entities)


class LidarrSensor(LidarrEntity[T], SensorEntity):
    """Implementation of the Lidarr sensor."""

    entity_description: LidarrSensorEntityDescription[T]

    def __init__(
        self,
        coordinator: LidarrDataUpdateCoordinator[T],
        description: LidarrSensorEntityDescription[T],
        folder_name: str = "",
    ) -> None:
        """Create Lidarr entity."""
        super().__init__(coordinator, description)
        self.folder_name = folder_name

    @property
    def extra_state_attributes(self) -> dict[str, str] | None:
        """Return the state attributes of the sensor."""
        return self.entity_description.attributes_fn(self.coordinator.data)

    @property
    def native_value(self) -> str | int:
        """Return the state of the sensor."""
        return self.entity_description.value_fn(self.coordinator.data, self.folder_name)


def queue_str(item: LidarrQueueItem) -> str:
    """Return string description of queue item."""
    if (
        item.sizeleft > 0
        and item.timeleft == "00:00:00"
        or not hasattr(item, "trackedDownloadState")
    ):
        return "stopped"
    return item.trackedDownloadState