"""Support for System Bridge sensors."""
from __future__ import annotations

from collections.abc import Callable
from dataclasses import dataclass
from datetime import datetime, timedelta, timezone
from typing import Final, cast

from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorEntityDescription,
    SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    CONF_PORT,
    PERCENTAGE,
    REVOLUTIONS_PER_MINUTE,
    UnitOfElectricPotential,
    UnitOfFrequency,
    UnitOfInformation,
    UnitOfPower,
    UnitOfTemperature,
)
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.typing import StateType
from homeassistant.util.dt import utcnow

from . import SystemBridgeEntity
from .const import DOMAIN
from .coordinator import SystemBridgeCoordinatorData, SystemBridgeDataUpdateCoordinator

ATTR_AVAILABLE: Final = "available"
ATTR_FILESYSTEM: Final = "filesystem"
ATTR_MOUNT: Final = "mount"
ATTR_SIZE: Final = "size"
ATTR_TYPE: Final = "type"
ATTR_USED: Final = "used"

PIXELS: Final = "px"


@dataclass
class SystemBridgeSensorEntityDescription(SensorEntityDescription):
    """Class describing System Bridge sensor entities."""

    value: Callable = round


def battery_time_remaining(data: SystemBridgeCoordinatorData) -> datetime | None:
    """Return the battery time remaining."""
    if data.battery.sensors_secsleft is not None:
        return utcnow() + timedelta(seconds=data.battery.sensors_secsleft)
    return None


def cpu_speed(data: SystemBridgeCoordinatorData) -> float | None:
    """Return the CPU speed."""
    if data.cpu.frequency_current is not None:
        return round(data.cpu.frequency_current / 1000, 2)
    return None


def gpu_core_clock_speed(data: SystemBridgeCoordinatorData, key: str) -> float | None:
    """Return the GPU core clock speed."""
    if getattr(data.gpu, f"{key}_core_clock") is not None:
        return round(getattr(data.gpu, f"{key}_core_clock"))
    return None


def gpu_memory_clock_speed(data: SystemBridgeCoordinatorData, key: str) -> float | None:
    """Return the GPU memory clock speed."""
    if getattr(data.gpu, f"{key}_memory_clock") is not None:
        return round(getattr(data.gpu, f"{key}_memory_clock"))
    return None


def gpu_memory_free(data: SystemBridgeCoordinatorData, key: str) -> float | None:
    """Return the free GPU memory."""
    if getattr(data.gpu, f"{key}_memory_free") is not None:
        return round(getattr(data.gpu, f"{key}_memory_free") / 10**3, 2)
    return None


def gpu_memory_used(data: SystemBridgeCoordinatorData, key: str) -> float | None:
    """Return the used GPU memory."""
    if getattr(data.gpu, f"{key}_memory_used") is not None:
        return round(getattr(data.gpu, f"{key}_memory_used") / 10**3, 2)
    return None


def gpu_memory_used_percentage(
    data: SystemBridgeCoordinatorData, key: str
) -> float | None:
    """Return the used GPU memory percentage."""
    if (
        getattr(data.gpu, f"{key}_memory_used") is not None
        and getattr(data.gpu, f"{key}_memory_total") is not None
    ):
        return round(
            getattr(data.gpu, f"{key}_memory_used")
            / getattr(data.gpu, f"{key}_memory_total")
            * 100,
            2,
        )
    return None


def memory_free(data: SystemBridgeCoordinatorData) -> float | None:
    """Return the free memory."""
    if data.memory.virtual_free is not None:
        return round(data.memory.virtual_free / 1000**3, 2)
    return None


def memory_used(data: SystemBridgeCoordinatorData) -> float | None:
    """Return the used memory."""
    if data.memory.virtual_used is not None:
        return round(data.memory.virtual_used / 1000**3, 2)
    return None


BASE_SENSOR_TYPES: tuple[SystemBridgeSensorEntityDescription, ...] = (
    SystemBridgeSensorEntityDescription(
        key="boot_time",
        name="Boot Time",
        device_class=SensorDeviceClass.TIMESTAMP,
        icon="mdi:av-timer",
        value=lambda data: datetime.fromtimestamp(
            data.system.boot_time, tz=timezone.utc
        ),
    ),
    SystemBridgeSensorEntityDescription(
        key="cpu_speed",
        name="CPU Speed",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=UnitOfFrequency.GIGAHERTZ,
        device_class=SensorDeviceClass.FREQUENCY,
        icon="mdi:speedometer",
        value=cpu_speed,
    ),
    SystemBridgeSensorEntityDescription(
        key="cpu_temperature",
        name="CPU Temperature",
        entity_registry_enabled_default=False,
        device_class=SensorDeviceClass.TEMPERATURE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=UnitOfTemperature.CELSIUS,
        value=lambda data: data.cpu.temperature,
    ),
    SystemBridgeSensorEntityDescription(
        key="cpu_voltage",
        name="CPU Voltage",
        entity_registry_enabled_default=False,
        device_class=SensorDeviceClass.VOLTAGE,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=UnitOfElectricPotential.VOLT,
        value=lambda data: data.cpu.voltage,
    ),
    SystemBridgeSensorEntityDescription(
        key="kernel",
        name="Kernel",
        state_class=SensorStateClass.MEASUREMENT,
        icon="mdi:devices",
        value=lambda data: data.system.platform,
    ),
    SystemBridgeSensorEntityDescription(
        key="memory_free",
        name="Memory Free",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=UnitOfInformation.GIGABYTES,
        device_class=SensorDeviceClass.DATA_SIZE,
        icon="mdi:memory",
        value=memory_free,
    ),
    SystemBridgeSensorEntityDescription(
        key="memory_used_percentage",
        name="Memory Used %",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PERCENTAGE,
        icon="mdi:memory",
        value=lambda data: data.memory.virtual_percent,
    ),
    SystemBridgeSensorEntityDescription(
        key="memory_used",
        name="Memory Used",
        entity_registry_enabled_default=False,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=UnitOfInformation.GIGABYTES,
        device_class=SensorDeviceClass.DATA_SIZE,
        icon="mdi:memory",
        value=memory_used,
    ),
    SystemBridgeSensorEntityDescription(
        key="os",
        name="Operating System",
        state_class=SensorStateClass.MEASUREMENT,
        icon="mdi:devices",
        value=lambda data: f"{data.system.platform} {data.system.platform_version}",
    ),
    SystemBridgeSensorEntityDescription(
        key="processes_load",
        name="Load",
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PERCENTAGE,
        icon="mdi:percent",
        value=lambda data: data.cpu.usage,
    ),
    SystemBridgeSensorEntityDescription(
        key="version",
        name="Version",
        icon="mdi:counter",
        value=lambda data: data.system.version,
    ),
    SystemBridgeSensorEntityDescription(
        key="version_latest",
        name="Latest Version",
        icon="mdi:counter",
        value=lambda data: data.system.version_latest,
    ),
)

BATTERY_SENSOR_TYPES: tuple[SystemBridgeSensorEntityDescription, ...] = (
    SystemBridgeSensorEntityDescription(
        key="battery",
        name="Battery",
        device_class=SensorDeviceClass.BATTERY,
        state_class=SensorStateClass.MEASUREMENT,
        native_unit_of_measurement=PERCENTAGE,
        value=lambda data: data.battery.percentage,
    ),
    SystemBridgeSensorEntityDescription(
        key="battery_time_remaining",
        name="Battery Time Remaining",
        device_class=SensorDeviceClass.TIMESTAMP,
        state_class=SensorStateClass.MEASUREMENT,
        value=battery_time_remaining,
    ),
)


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up System Bridge sensor based on a config entry."""
    coordinator: SystemBridgeDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]

    entities = []
    for description in BASE_SENSOR_TYPES:
        entities.append(
            SystemBridgeSensor(coordinator, description, entry.data[CONF_PORT])
        )

    for partition in coordinator.data.disk.partitions:
        entities.append(
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"filesystem_{partition.replace(':', '')}",
                    name=f"{partition} Space Used",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=PERCENTAGE,
                    icon="mdi:harddisk",
                    value=lambda data, p=partition: getattr(
                        data.disk, f"usage_{p}_percent"
                    ),
                ),
                entry.data[CONF_PORT],
            )
        )

    if (
        coordinator.data.battery
        and coordinator.data.battery.percentage
        and coordinator.data.battery.percentage > -1
    ):
        for description in BATTERY_SENSOR_TYPES:
            entities.append(
                SystemBridgeSensor(coordinator, description, entry.data[CONF_PORT])
            )

    displays = []
    for display in coordinator.data.display.displays:
        displays.append(
            {
                "key": display,
                "name": getattr(coordinator.data.display, f"{display}_name").replace(
                    "Display ", ""
                ),
            },
        )
    display_count = len(displays)

    entities.append(
        SystemBridgeSensor(
            coordinator,
            SystemBridgeSensorEntityDescription(
                key="displays_connected",
                name="Displays Connected",
                state_class=SensorStateClass.MEASUREMENT,
                icon="mdi:monitor",
                value=lambda _, count=display_count: count,
            ),
            entry.data[CONF_PORT],
        )
    )

    for _, display in enumerate(displays):
        entities = [
            *entities,
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"display_{display['name']}_resolution_x",
                    name=f"Display {display['name']} Resolution X",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=PIXELS,
                    icon="mdi:monitor",
                    value=lambda data, k=display["key"]: getattr(
                        data.display, f"{k}_resolution_horizontal"
                    ),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"display_{display['name']}_resolution_y",
                    name=f"Display {display['name']} Resolution Y",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=PIXELS,
                    icon="mdi:monitor",
                    value=lambda data, k=display["key"]: getattr(
                        data.display, f"{k}_resolution_vertical"
                    ),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"display_{display['name']}_refresh_rate",
                    name=f"Display {display['name']} Refresh Rate",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfFrequency.HERTZ,
                    device_class=SensorDeviceClass.FREQUENCY,
                    icon="mdi:monitor",
                    value=lambda data, k=display["key"]: getattr(
                        data.display, f"{k}_refresh_rate"
                    ),
                ),
                entry.data[CONF_PORT],
            ),
        ]

    gpus = []
    for gpu in coordinator.data.gpu.gpus:
        gpus.append(
            {
                "key": gpu,
                "name": getattr(coordinator.data.gpu, f"{gpu}_name"),
            },
        )

    for index, gpu in enumerate(gpus):
        entities = [
            *entities,
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_core_clock_speed",
                    name=f"{gpu['name']} Clock Speed",
                    entity_registry_enabled_default=False,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfFrequency.MEGAHERTZ,
                    device_class=SensorDeviceClass.FREQUENCY,
                    icon="mdi:speedometer",
                    value=lambda data, k=gpu["key"]: gpu_core_clock_speed(data, k),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_memory_clock_speed",
                    name=f"{gpu['name']} Memory Clock Speed",
                    entity_registry_enabled_default=False,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfFrequency.MEGAHERTZ,
                    device_class=SensorDeviceClass.FREQUENCY,
                    icon="mdi:speedometer",
                    value=lambda data, k=gpu["key"]: gpu_memory_clock_speed(data, k),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_memory_free",
                    name=f"{gpu['name']} Memory Free",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfInformation.GIGABYTES,
                    device_class=SensorDeviceClass.DATA_SIZE,
                    icon="mdi:memory",
                    value=lambda data, k=gpu["key"]: gpu_memory_free(data, k),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_memory_used_percentage",
                    name=f"{gpu['name']} Memory Used %",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=PERCENTAGE,
                    icon="mdi:memory",
                    value=lambda data, k=gpu["key"]: gpu_memory_used_percentage(
                        data, k
                    ),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_memory_used",
                    name=f"{gpu['name']} Memory Used",
                    entity_registry_enabled_default=False,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfInformation.GIGABYTES,
                    device_class=SensorDeviceClass.DATA_SIZE,
                    icon="mdi:memory",
                    value=lambda data, k=gpu["key"]: gpu_memory_used(data, k),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_fan_speed",
                    name=f"{gpu['name']} Fan Speed",
                    entity_registry_enabled_default=False,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=REVOLUTIONS_PER_MINUTE,
                    icon="mdi:fan",
                    value=lambda data, k=gpu["key"]: getattr(
                        data.gpu, f"{k}_fan_speed"
                    ),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_power_usage",
                    name=f"{gpu['name']} Power Usage",
                    entity_registry_enabled_default=False,
                    device_class=SensorDeviceClass.POWER,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfPower.WATT,
                    value=lambda data, k=gpu["key"]: getattr(data.gpu, f"{k}_power"),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_temperature",
                    name=f"{gpu['name']} Temperature",
                    entity_registry_enabled_default=False,
                    device_class=SensorDeviceClass.TEMPERATURE,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=UnitOfTemperature.CELSIUS,
                    value=lambda data, k=gpu["key"]: getattr(
                        data.gpu, f"{k}_temperature"
                    ),
                ),
                entry.data[CONF_PORT],
            ),
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"gpu_{index}_usage_percentage",
                    name=f"{gpu['name']} Usage %",
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=PERCENTAGE,
                    icon="mdi:percent",
                    value=lambda data, k=gpu["key"]: getattr(
                        data.gpu, f"{k}_core_load"
                    ),
                ),
                entry.data[CONF_PORT],
            ),
        ]

    for index in range(coordinator.data.cpu.count):
        entities = [
            *entities,
            SystemBridgeSensor(
                coordinator,
                SystemBridgeSensorEntityDescription(
                    key=f"processes_load_cpu_{index}",
                    name=f"Load CPU {index}",
                    entity_registry_enabled_default=False,
                    state_class=SensorStateClass.MEASUREMENT,
                    native_unit_of_measurement=PERCENTAGE,
                    icon="mdi:percent",
                    value=lambda data, k=index: getattr(data.cpu, f"usage_{k}"),
                ),
                entry.data[CONF_PORT],
            ),
        ]

    async_add_entities(entities)


class SystemBridgeSensor(SystemBridgeEntity, SensorEntity):
    """Define a System Bridge sensor."""

    entity_description: SystemBridgeSensorEntityDescription

    def __init__(
        self,
        coordinator: SystemBridgeDataUpdateCoordinator,
        description: SystemBridgeSensorEntityDescription,
        api_port: int,
    ) -> None:
        """Initialize."""
        super().__init__(
            coordinator,
            api_port,
            description.key,
            description.name,
        )
        self.entity_description = description

    @property
    def native_value(self) -> StateType:
        """Return the state."""
        try:
            return cast(StateType, self.entity_description.value(self.coordinator.data))
        except TypeError:
            return None
