"""AirSend covers."""
from typing import Any

from .device import Device

from homeassistant.components.cover import CoverEntity
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant
from homeassistant.helpers.entity import DeviceInfo
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.restore_state import RestoreEntity
from homeassistant.const import CONF_INTERNAL_URL

from . import DOMAIN


async def async_setup_entry(
    hass: HomeAssistant,
    entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up AirSend covers from a config entry."""
    internal_url = entry.data.get(CONF_INTERNAL_URL, "")
    devices_config = entry.data.get("devices", {})
    entities = []
    for name, options in devices_config.items():
        device = Device(name, options, internal_url)
        if device.is_cover:
            entities.append(AirSendCover(hass, device))
    async_add_entities(entities)


class AirSendCover(RestoreEntity, CoverEntity):
    """Representation of an AirSend Cover."""

    def __init__(self, hass: HomeAssistant, device: Device) -> None:
        self._hass = hass
        self._device = device
        self._unique_id = DOMAIN + "_" + str(device.unique_channel_name) + "_cover"
        self._closed = None
        self._available = True
        if device.is_cover_with_position:
            self._attr_current_cover_position = 50

    @property
    def unique_id(self):
        return self._unique_id

    @property
    def available(self):
        return self._available

    @property
    def should_poll(self):
        return False

    @property
    def name(self):
        return self._device.name

    @property
    def extra_state_attributes(self):
        return self._device.extra_state_attributes

    @property
    def assumed_state(self):
        return True

    @property
    def device_info(self) -> DeviceInfo:
        return self._device.device_info

    @property
    def is_closed(self):
        if self._device.is_async and self._hass:
            component = self._hass.states.get(self.entity_id)
            if component is not None:
                self._closed = component.state not in ('open', 'on', 'up')
        return self._closed

    async def _send(self, note: dict) -> bool:
        """Send a command and update availability accordingly."""
        result = await self._device.async_transfer(note, self.entity_id)
        available = result is not False
        if self._available != available:
            self._available = available
            self.async_write_ha_state()
        return result is not False

    async def async_open_cover(self, **kwargs: Any) -> None:
        note = {"method": 1, "type": 0, "value": "UP"}
        if await self._send(note):
            self._closed = False
            if self._device.is_cover_with_position:
                self._attr_current_cover_position = 100
            self.async_write_ha_state()

    async def async_close_cover(self, **kwargs: Any) -> None:
        note = {"method": 1, "type": 0, "value": "DOWN"}
        if await self._send(note):
            self._closed = True
            if self._device.is_cover_with_position:
                self._attr_current_cover_position = 0
            self.async_write_ha_state()

    async def async_stop_cover(self, **kwargs: Any) -> None:
        note = {"method": 1, "type": 0, "value": "STOP"}
        if await self._send(note):
            self._closed = False
            if self._device.is_cover_with_position:
                self._attr_current_cover_position = 50
            self.async_write_ha_state()

    async def async_set_cover_position(self, **kwargs: Any) -> None:
        position = int(kwargs["position"])
        note = {"method": 1, "type": 9, "value": position}
        if await self._send(note):
            self._attr_current_cover_position = position
            self._closed = position == 0
            self.async_write_ha_state()

    async def async_added_to_hass(self):
        """Restore last known state when added to hass."""
        await super().async_added_to_hass()

        # Get the last known state
        last_state = await self.async_get_last_state()

        # Only restore from a meaningful previous state. If HASS was
        # restarted while the entity was "unavailable" (e.g. AirSend
        # connectivity loss), don't carry that over: keep the defaults
        # so the entity comes back available instead of staying stuck.
        if last_state and last_state.state not in ('unavailable', 'unknown'):
            # Restore position for covers with position support (type 4099)
            if self._device.is_cover_with_position:
                # Try to restore position from attributes
                if last_state.attributes.get('current_position') is not None:
                    self._attr_current_cover_position = last_state.attributes['current_position']

                # Override position based on state if fully open/closed
                if last_state.state == 'closed':
                    self._attr_current_cover_position = 0
                elif last_state.state == 'open':
                    self._attr_current_cover_position = 100

            # Restore closed/open state for all covers
            if last_state.state == 'closed':
                self._closed = True
            elif last_state.state == 'open':
                self._closed = False
        # If no usable last_state, keep the defaults (50% for position covers)

        # Always publish the current state so the entity doesn't stay
        # stuck on a stale cached state across a restart.
        self.async_write_ha_state()