"""Support for scene platform for Hue scenes (V2 only)."""
from __future__ import annotations

from typing import Any

from aiohue.v2 import HueBridgeV2
from aiohue.v2.controllers.events import EventType
from aiohue.v2.controllers.scenes import ScenesController
from aiohue.v2.models.scene import Scene as HueScene

from homeassistant.components.light import ATTR_TRANSITION
from homeassistant.components.scene import Scene as SceneEntity
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant, callback
from homeassistant.helpers.entity_platform import AddEntitiesCallback

from .bridge import HueBridge
from .const import DOMAIN
from .v2.entity import HueBaseEntity
from .v2.helpers import normalize_hue_transition


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up scene platform from Hue group scenes."""
    bridge: HueBridge = hass.data[DOMAIN][config_entry.entry_id]
    api: HueBridgeV2 = bridge.api

    if bridge.api_version == 1:
        # should not happen, but just in case
        raise NotImplementedError("Scene support is only available for V2 bridges")

    # add entities for all scenes
    @callback
    def async_add_entity(event_type: EventType, resource: HueScene) -> None:
        """Add entity from Hue resource."""
        async_add_entities([HueSceneEntity(bridge, api.scenes, resource)])

    # add all current items in controller
    for item in api.scenes:
        async_add_entity(EventType.RESOURCE_ADDED, item)

    # register listener for new items only
    config_entry.async_on_unload(
        api.scenes.subscribe(async_add_entity, event_filter=EventType.RESOURCE_ADDED)
    )


class HueSceneEntity(HueBaseEntity, SceneEntity):
    """Representation of a Scene entity from Hue Scenes."""

    def __init__(
        self,
        bridge: HueBridge,
        controller: ScenesController,
        resource: HueScene,
    ) -> None:
        """Initialize the entity."""
        super().__init__(bridge, controller, resource)
        self.resource = resource
        self.controller = controller
        self.group = self.controller.get_group(self.resource.id)

    async def async_added_to_hass(self) -> None:
        """Call when entity is added."""
        await super().async_added_to_hass()
        # Add value_changed callback for group to catch name changes.
        self.async_on_remove(
            self.bridge.api.groups.subscribe(
                self._handle_event,
                self.group.id,
                (EventType.RESOURCE_UPDATED),
            )
        )

    @property
    def name(self) -> str:
        """Return default entity name."""
        group = self.controller.get_group(self.resource.id)
        return f"{group.metadata.name} - {self.resource.metadata.name}"

    @property
    def is_dynamic(self) -> bool:
        """Return if this scene has a dynamic color palette."""
        if self.resource.palette.color and len(self.resource.palette.color) > 1:
            return True
        if (
            self.resource.palette.color_temperature
            and len(self.resource.palette.color_temperature) > 1
        ):
            return True
        return False

    async def async_activate(self, **kwargs: Any) -> None:
        """Activate Hue scene."""
        transition = normalize_hue_transition(kwargs.get(ATTR_TRANSITION))
        dynamic = kwargs.get("dynamic", self.is_dynamic)

        await self.bridge.async_request_call(
            self.controller.recall,
            self.resource.id,
            dynamic=dynamic,
            duration=transition,
        )

    @property
    def extra_state_attributes(self) -> dict[str, Any] | None:
        """Return the optional state attributes."""
        brightness = None
        if palette := self.resource.palette:
            if palette.dimming:
                brightness = palette.dimming[0].brightness
        if brightness is None:
            # get brightness from actions
            for action in self.resource.actions:
                if action.action.dimming:
                    brightness = action.action.dimming.brightness
                    break
        return {
            "group_name": self.group.metadata.name,
            "group_type": self.group.type.value,
            "name": self.resource.metadata.name,
            "speed": self.resource.speed,
            "brightness": brightness,
            "is_dynamic": self.is_dynamic,
        }