"""Switch for Shelly."""

from __future__ import annotations

from dataclasses import dataclass
from typing import Any, cast

from aioshelly.block_device import Block
from aioshelly.const import MODEL_2, MODEL_25, MODEL_WALL_DISPLAY, RPC_GENERATIONS

from homeassistant.components.switch import SwitchEntity, SwitchEntityDescription
from homeassistant.const import STATE_ON, EntityCategory
from homeassistant.core import HomeAssistant, State, callback
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.entity_registry import RegistryEntry
from homeassistant.helpers.restore_state import RestoreEntity

from .const import CONF_SLEEP_PERIOD, MOTION_MODELS
from .coordinator import ShellyBlockCoordinator, ShellyConfigEntry, ShellyRpcCoordinator
from .entity import (
    BlockEntityDescription,
    ShellyBlockEntity,
    ShellyRpcEntity,
    ShellySleepingBlockAttributeEntity,
    async_setup_entry_attribute_entities,
)
from .utils import (
    async_remove_shelly_entity,
    get_device_entry_gen,
    get_rpc_key_ids,
    is_block_channel_type_light,
    is_rpc_channel_type_light,
    is_rpc_thermostat_internal_actuator,
    is_rpc_thermostat_mode,
)


@dataclass(frozen=True, kw_only=True)
class BlockSwitchDescription(BlockEntityDescription, SwitchEntityDescription):
    """Class to describe a BLOCK switch."""


MOTION_SWITCH = BlockSwitchDescription(
    key="sensor|motionActive",
    name="Motion detection",
    entity_category=EntityCategory.CONFIG,
)


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ShellyConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up switches for device."""
    if get_device_entry_gen(config_entry) in RPC_GENERATIONS:
        return async_setup_rpc_entry(hass, config_entry, async_add_entities)

    return async_setup_block_entry(hass, config_entry, async_add_entities)


@callback
def async_setup_block_entry(
    hass: HomeAssistant,
    config_entry: ShellyConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up entities for block device."""
    coordinator = config_entry.runtime_data.block
    assert coordinator

    # Add Shelly Motion as a switch
    if coordinator.model in MOTION_MODELS:
        async_setup_entry_attribute_entities(
            hass,
            config_entry,
            async_add_entities,
            {("sensor", "motionActive"): MOTION_SWITCH},
            BlockSleepingMotionSwitch,
        )
        return

    if config_entry.data[CONF_SLEEP_PERIOD]:
        return

    # In roller mode the relay blocks exist but do not contain required info
    if (
        coordinator.model in [MODEL_2, MODEL_25]
        and coordinator.device.settings["mode"] != "relay"
    ):
        return

    relay_blocks = []
    assert coordinator.device.blocks
    for block in coordinator.device.blocks:
        if (
            block.type != "relay"
            or block.channel is not None
            and is_block_channel_type_light(
                coordinator.device.settings, int(block.channel)
            )
        ):
            continue

        relay_blocks.append(block)
        unique_id = f"{coordinator.mac}-{block.type}_{block.channel}"
        async_remove_shelly_entity(hass, "light", unique_id)

    if not relay_blocks:
        return

    async_add_entities(BlockRelaySwitch(coordinator, block) for block in relay_blocks)


@callback
def async_setup_rpc_entry(
    hass: HomeAssistant,
    config_entry: ShellyConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up entities for RPC device."""
    coordinator = config_entry.runtime_data.rpc
    assert coordinator
    switch_key_ids = get_rpc_key_ids(coordinator.device.status, "switch")

    switch_ids = []
    for id_ in switch_key_ids:
        if is_rpc_channel_type_light(coordinator.device.config, id_):
            continue

        if coordinator.model == MODEL_WALL_DISPLAY:
            # There are three configuration scenarios for WallDisplay:
            # - relay mode (no thermostat)
            # - thermostat mode using the internal relay as an actuator
            # - thermostat mode using an external (from another device) relay as
            #   an actuator
            if not is_rpc_thermostat_mode(id_, coordinator.device.status):
                # The device is not in thermostat mode, we need to remove a climate
                # entity
                unique_id = f"{coordinator.mac}-thermostat:{id_}"
                async_remove_shelly_entity(hass, "climate", unique_id)
            elif is_rpc_thermostat_internal_actuator(coordinator.device.status):
                # The internal relay is an actuator, skip this ID so as not to create
                # a switch entity
                continue

        switch_ids.append(id_)
        unique_id = f"{coordinator.mac}-switch:{id_}"
        async_remove_shelly_entity(hass, "light", unique_id)

    if not switch_ids:
        return

    async_add_entities(RpcRelaySwitch(coordinator, id_) for id_ in switch_ids)


class BlockSleepingMotionSwitch(
    ShellySleepingBlockAttributeEntity, RestoreEntity, SwitchEntity
):
    """Entity that controls Motion Sensor on Block based Shelly devices."""

    entity_description: BlockSwitchDescription
    _attr_translation_key = "motion_switch"

    def __init__(
        self,
        coordinator: ShellyBlockCoordinator,
        block: Block | None,
        attribute: str,
        description: BlockSwitchDescription,
        entry: RegistryEntry | None = None,
    ) -> None:
        """Initialize the sleeping sensor."""
        super().__init__(coordinator, block, attribute, description, entry)
        self.last_state: State | None = None

    @property
    def is_on(self) -> bool | None:
        """If motion is active."""
        if self.block is not None:
            return bool(self.block.motionActive)

        if self.last_state is None:
            return None

        return self.last_state.state == STATE_ON

    async def async_turn_on(self, **kwargs: Any) -> None:
        """Activate switch."""
        await self.coordinator.device.set_shelly_motion_detection(True)
        self.async_write_ha_state()

    async def async_turn_off(self, **kwargs: Any) -> None:
        """Deactivate switch."""
        await self.coordinator.device.set_shelly_motion_detection(False)
        self.async_write_ha_state()

    async def async_added_to_hass(self) -> None:
        """Handle entity which will be added."""
        await super().async_added_to_hass()
        if (last_state := await self.async_get_last_state()) is not None:
            self.last_state = last_state


class BlockRelaySwitch(ShellyBlockEntity, SwitchEntity):
    """Entity that controls a relay on Block based Shelly devices."""

    def __init__(self, coordinator: ShellyBlockCoordinator, block: Block) -> None:
        """Initialize relay switch."""
        super().__init__(coordinator, block)
        self.control_result: dict[str, Any] | None = None

    @property
    def is_on(self) -> bool:
        """If switch is on."""
        if self.control_result:
            return cast(bool, self.control_result["ison"])

        return bool(self.block.output)

    async def async_turn_on(self, **kwargs: Any) -> None:
        """Turn on relay."""
        self.control_result = await self.set_state(turn="on")
        self.async_write_ha_state()

    async def async_turn_off(self, **kwargs: Any) -> None:
        """Turn off relay."""
        self.control_result = await self.set_state(turn="off")
        self.async_write_ha_state()

    @callback
    def _update_callback(self) -> None:
        """When device updates, clear control result that overrides state."""
        self.control_result = None
        super()._update_callback()


class RpcRelaySwitch(ShellyRpcEntity, SwitchEntity):
    """Entity that controls a relay on RPC based Shelly devices."""

    def __init__(self, coordinator: ShellyRpcCoordinator, id_: int) -> None:
        """Initialize relay switch."""
        super().__init__(coordinator, f"switch:{id_}")
        self._id = id_

    @property
    def is_on(self) -> bool:
        """If switch is on."""
        return bool(self.status["output"])

    async def async_turn_on(self, **kwargs: Any) -> None:
        """Turn on relay."""
        await self.call_rpc("Switch.Set", {"id": self._id, "on": True})

    async def async_turn_off(self, **kwargs: Any) -> None:
        """Turn off relay."""
        await self.call_rpc("Switch.Set", {"id": self._id, "on": False})