"""Xiaoxiang Smart BMS — Home Assistant integration."""
from __future__ import annotations

import asyncio

from homeassistant.components.bluetooth import (
    BluetoothChange,
    BluetoothScanningMode,
    BluetoothServiceInfoBleak,
    async_register_callback,
)
from homeassistant.components.bluetooth.match import ADDRESS, BluetoothCallbackMatcher
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant, callback

from .const import CONF_ADDRESS, CONF_POLL_INTERVAL, DEFAULT_POLL_INTERVAL, DOMAIN
from .coordinator import BmsCoordinator

PLATFORMS = ["sensor", "binary_sensor", "number", "select"]


async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Set up the BMS integration from a config entry."""
    address = entry.data[CONF_ADDRESS]
    poll_interval = entry.options.get(CONF_POLL_INTERVAL, DEFAULT_POLL_INTERVAL)

    hass.data.setdefault(DOMAIN, {})

    # Shared BLE lock — only one BMS connects at a time to avoid
    # ESPHome proxy connection slot exhaustion with multiple devices.
    if "_ble_lock" not in hass.data[DOMAIN]:
        hass.data[DOMAIN]["_ble_lock"] = asyncio.Lock()
    ble_lock = hass.data[DOMAIN]["_ble_lock"]

    coordinator = BmsCoordinator(
        hass, address, poll_interval,
        name=entry.title,
        ble_lock=ble_lock,
    )

    # Keep the coordinator's BLE device reference fresh via advertisement callback.
    # This avoids stale transport paths when ESPHome proxies cycle.
    @callback
    def _async_update_ble(
        service_info: BluetoothServiceInfoBleak,
        change: BluetoothChange,
    ) -> None:
        coordinator._ble_device = service_info.device

    entry.async_on_unload(
        async_register_callback(
            hass,
            _async_update_ble,
            BluetoothCallbackMatcher({ADDRESS: address}),
            BluetoothScanningMode.PASSIVE,
        )
    )

    await coordinator.async_setup()
    await coordinator.async_config_entry_first_refresh()

    hass.data[DOMAIN][entry.entry_id] = coordinator
    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)

    entry.async_on_unload(entry.add_update_listener(_async_update_listener))

    return True


async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Unload the BMS integration."""
    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
    if unload_ok:
        coordinator: BmsCoordinator = hass.data[DOMAIN].pop(entry.entry_id)
        await coordinator.async_teardown()
    return unload_ok


async def _async_update_listener(hass: HomeAssistant, entry: ConfigEntry) -> None:
    """Reload the entry when options are changed."""
    await hass.config_entries.async_reload(entry.entry_id)