"""Bluetooth device models for esphome."""
from __future__ import annotations

import asyncio
from dataclasses import dataclass, field
import logging

from homeassistant.core import callback

_LOGGER = logging.getLogger(__name__)


@dataclass(slots=True)
class ESPHomeBluetoothDevice:
    """Bluetooth data for a specific ESPHome device."""

    name: str
    mac_address: str
    ble_connections_free: int = 0
    ble_connections_limit: int = 0
    _ble_connection_free_futures: list[asyncio.Future[int]] = field(
        default_factory=list
    )

    @callback
    def async_update_ble_connection_limits(self, free: int, limit: int) -> None:
        """Update the BLE connection limits."""
        _LOGGER.debug(
            "%s [%s]: BLE connection limits: used=%s free=%s limit=%s",
            self.name,
            self.mac_address,
            limit - free,
            free,
            limit,
        )
        self.ble_connections_free = free
        self.ble_connections_limit = limit
        if not free:
            return
        for fut in self._ble_connection_free_futures:
            # If wait_for_ble_connections_free gets cancelled, it will
            # leave a future in the list. We need to check if it's done
            # before setting the result.
            if not fut.done():
                fut.set_result(free)
        self._ble_connection_free_futures.clear()

    async def wait_for_ble_connections_free(self) -> int:
        """Wait until there are free BLE connections."""
        if self.ble_connections_free > 0:
            return self.ble_connections_free
        fut: asyncio.Future[int] = asyncio.Future()
        self._ble_connection_free_futures.append(fut)
        return await fut