"""Support for Peblar selects."""

from collections.abc import Awaitable, Callable
from dataclasses import dataclass
from typing import Any, override

from peblar import (
    LedBrightness,
    Peblar,
    PeblarUserConfiguration,
    SmartChargingMode,
    SoundVolume,
)

from homeassistant.components.select import SelectEntity, SelectEntityDescription
from homeassistant.const import EntityCategory
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback

from .coordinator import (
    PeblarConfigEntry,
    PeblarRuntimeData,
    PeblarUserConfigurationDataUpdateCoordinator,
)
from .entity import PeblarEntity
from .helpers import peblar_exception_handler

PARALLEL_UPDATES = 1


@dataclass(frozen=True, kw_only=True)
class PeblarSelectEntityDescription(SelectEntityDescription):
    """Class describing Peblar select entities."""

    has_fn: Callable[[PeblarRuntimeData], bool] = lambda _: True
    options_fn: Callable[[PeblarUserConfiguration], list[str]] | None = None
    current_fn: Callable[[PeblarUserConfiguration], str | None]
    select_fn: Callable[[Peblar, str], Awaitable[Any]]


def _smart_charging_options(configuration: PeblarUserConfiguration) -> list[str]:
    """Return the smart charging modes this charger will accept.

    A charger without a power meter configured rejects solar charging, and
    scheduled charging can be switched off during commissioning. Offering
    those anyway lands the user on a mode the charger quietly ignores.
    """
    solar = configuration.solar_charging_allowed
    return [
        option
        for option, allowed in (
            ("default", True),
            ("fast_solar", solar),
            ("pure_solar", solar),
            ("scheduled", configuration.scheduled_charging_allowed),
            ("smart_solar", solar),
        )
        if allowed
    ]


DESCRIPTIONS = [
    PeblarSelectEntityDescription(
        key="smart_charging",
        translation_key="smart_charging",
        entity_category=EntityCategory.CONFIG,
        options_fn=_smart_charging_options,
        current_fn=lambda x: x.smart_charging.value if x.smart_charging else None,
        select_fn=lambda x, mode: x.smart_charging(SmartChargingMode(mode)),
    ),
    PeblarSelectEntityDescription(
        key="buzzer_volume",
        translation_key="buzzer_volume",
        entity_category=EntityCategory.CONFIG,
        has_fn=lambda x: x.system_information.hardware_has_buzzer,
        options=[
            "off",
            "low",
            "low_medium",
            "medium",
            "high",
        ],
        current_fn=lambda x: x.buzzer_volume.name.lower(),
        select_fn=lambda x, option: x.set_buzzer_volume(
            volume=SoundVolume[option.upper()]
        ),
    ),
    PeblarSelectEntityDescription(
        key="led_brightness",
        translation_key="led_brightness",
        entity_category=EntityCategory.CONFIG,
        has_fn=lambda x: x.system_information.hardware_has_led,
        options=[
            "automatic",
            "off",
            "dim",
            "medium",
            "bright",
        ],
        # None when the charger reports a manual intensity that the UI has
        # no name for, which someone can set straight through the API.
        current_fn=lambda x: (
            x.led_brightness.name.lower() if x.led_brightness is not None else None
        ),
        select_fn=lambda x, option: x.set_led_brightness(
            brightness=LedBrightness[option.upper()]
        ),
    ),
]


async def async_setup_entry(
    hass: HomeAssistant,
    entry: PeblarConfigEntry,
    async_add_entities: AddConfigEntryEntitiesCallback,
) -> None:
    """Set up Peblar select based on a config entry."""
    async_add_entities(
        PeblarSelectEntity(
            entry=entry,
            coordinator=entry.runtime_data.user_configuration_coordinator,
            description=description,
        )
        for description in DESCRIPTIONS
        if description.has_fn(entry.runtime_data)
    )


class PeblarSelectEntity(
    PeblarEntity[PeblarUserConfigurationDataUpdateCoordinator],
    SelectEntity,
):
    """Defines a Peblar select entity."""

    entity_description: PeblarSelectEntityDescription

    @property
    @override
    def options(self) -> list[str]:
        """Return the options this charger currently accepts."""
        if (options_fn := self.entity_description.options_fn) is not None:
            return options_fn(self.coordinator.data)
        return super().options

    @property
    @override
    def current_option(self) -> str | None:
        """Return the selected entity option to represent the entity state."""
        return self.entity_description.current_fn(self.coordinator.data)

    @peblar_exception_handler
    @override
    async def async_select_option(self, option: str) -> None:
        """Change the selected option."""
        await self.entity_description.select_fn(self.coordinator.peblar, option)
        await self.coordinator.async_request_refresh()