"""Emby Media Player integration for Home Assistant."""

from __future__ import annotations

import logging
from dataclasses import dataclass
from typing import TypeAlias

from homeassistant.config_entries import ConfigEntry
from homeassistant.const import Platform
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import ConfigEntryAuthFailed, ConfigEntryNotReady
from homeassistant.helpers import device_registry as dr
from homeassistant.helpers import instance_id
from homeassistant.helpers.aiohttp_client import async_get_clientsession
from homeassistant.loader import async_get_integration

from .api import EmbyApiClient, EmbyAuthenticationError, EmbyConnectionError
from .const import (
    CONF_API_KEY,
    CONF_HOST,
    CONF_PORT,
    CONF_SCAN_INTERVAL,
    CONF_SSL,
    CONF_USER_ID,
    CONF_VERIFY_SSL,
    DEFAULT_DEVICE_VERSION,
    DEFAULT_SCAN_INTERVAL,
    DEFAULT_SSL,
    DEFAULT_VERIFY_SSL,
    DOMAIN,
)
from .coordinator import EmbyCoordinator
from .services import async_setup_services, async_unload_services
from .websocket import EmbyWebSocket

_LOGGER = logging.getLogger(__name__)

PLATFORMS = [Platform.MEDIA_PLAYER]


@dataclass
class EmbyRuntimeData:
    """Runtime data for Emby integration."""

    coordinator: EmbyCoordinator
    api: EmbyApiClient
    websocket: EmbyWebSocket
    user_id: str
    server_id: str | None = None


EmbyConfigEntry: TypeAlias = ConfigEntry[EmbyRuntimeData]


def _build_device_id(hass_uuid: str, entry_id: str) -> str:
    """Build a stable per-config-entry device id for Emby."""
    return f"hass-{hass_uuid[:8]}-{entry_id[:8]}"


async def _get_manifest_version(hass: HomeAssistant) -> str:
    """Read the integration version from its manifest, with a safe fallback."""
    try:
        integration = await async_get_integration(hass, DOMAIN)
    except Exception as err:  # noqa: BLE001 - manifest loading must not block setup
        _LOGGER.debug("Falling back to default device version: %s", err)
        return DEFAULT_DEVICE_VERSION
    return str(integration.version or DEFAULT_DEVICE_VERSION)


async def async_setup_entry(hass: HomeAssistant, entry: EmbyConfigEntry) -> bool:
    """Set up Emby Media Player from a config entry."""
    host = entry.data[CONF_HOST]
    port = int(entry.data[CONF_PORT])
    api_key = entry.data[CONF_API_KEY]
    ssl = entry.data.get(CONF_SSL, DEFAULT_SSL)
    verify_ssl = entry.data.get(CONF_VERIFY_SSL, DEFAULT_VERIFY_SSL)
    user_id = entry.data[CONF_USER_ID]
    scan_interval = int(
        entry.options.get(CONF_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL)
    )

    hass_uuid = await instance_id.async_get(hass)
    device_id = _build_device_id(hass_uuid, entry.entry_id)
    session = async_get_clientsession(hass)
    client_version = await _get_manifest_version(hass)

    api = EmbyApiClient(
        host=host,
        port=port,
        api_key=api_key,
        ssl=ssl,
        verify_ssl=verify_ssl,
        session=session,
        device_id=device_id,
        client_version=client_version,
    )

    try:
        server_info = await api.test_connection()
    except EmbyAuthenticationError as err:
        raise ConfigEntryAuthFailed(
            f"Authentication failed for Emby server: {err}"
        ) from err
    except EmbyConnectionError as err:
        raise ConfigEntryNotReady(
            f"Cannot connect to Emby server: {err}"
        ) from err

    websocket = EmbyWebSocket(
        host=host,
        port=port,
        api_key=api_key,
        ssl=ssl,
        verify_ssl=verify_ssl,
        session=session,
        device_id=device_id,
        client_version=client_version,
    )

    coordinator = EmbyCoordinator(
        hass=hass,
        api=api,
        websocket=websocket,
        scan_interval=scan_interval,
    )

    try:
        await coordinator.async_setup()
        await coordinator.async_config_entry_first_refresh()
    except Exception:
        # If first refresh fails, make sure the WebSocket task is cleaned up.
        await websocket.close()
        raise

    server_id = (
        server_info.get("Id") if isinstance(server_info, dict) else None
    )
    server_name = (
        server_info.get("ServerName") if isinstance(server_info, dict) else None
    )

    entry.runtime_data = EmbyRuntimeData(
        coordinator=coordinator,
        api=api,
        websocket=websocket,
        user_id=user_id,
        server_id=server_id,
    )

    # Register a hub device for via_device linking.
    device_registry = dr.async_get(hass)
    device_registry.async_get_or_create(
        config_entry_id=entry.entry_id,
        identifiers={(DOMAIN, entry.entry_id)},
        manufacturer="Emby",
        name=server_name or entry.title,
        entry_type=dr.DeviceEntryType.SERVICE,
        model="Emby Server",
    )

    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
    await async_setup_services(hass)

    entry.async_on_unload(entry.add_update_listener(_async_update_listener))

    return True


async def _async_update_listener(
    hass: HomeAssistant, entry: EmbyConfigEntry
) -> None:
    """Handle options update."""
    scan_interval = int(
        entry.options.get(CONF_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL)
    )
    entry.runtime_data.coordinator.update_scan_interval(scan_interval)
    _LOGGER.debug("Updated Emby scan interval to %d seconds", scan_interval)


async def async_unload_entry(
    hass: HomeAssistant, entry: EmbyConfigEntry
) -> bool:
    """Unload a config entry."""
    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)

    if unload_ok:
        await entry.runtime_data.coordinator.async_shutdown()

    # Tear down services when the last entry is unloaded.
    others_loaded = any(
        e.entry_id != entry.entry_id
        for e in hass.config_entries.async_entries(DOMAIN)
    )
    if not others_loaded:
        async_unload_services(hass)

    return unload_ok


async def async_remove_config_entry_device(
    hass: HomeAssistant,
    entry: EmbyConfigEntry,
    device_entry: dr.DeviceEntry,
) -> bool:
    """Allow the user to remove device entries that are no longer present.

    Refuse to remove:
    - The implicit "hub" device (identifier == entry.entry_id), since
      removing it would orphan all session entities.
    - Any device whose session is still present in the coordinator.
    """
    # ``entry.runtime_data`` may be unset if the entry is mid-(re)load.
    runtime_data = getattr(entry, "runtime_data", None)
    for domain, identifier in device_entry.identifiers:
        if domain != DOMAIN:
            continue
        if identifier == entry.entry_id:
            return False  # hub device
        if runtime_data is not None and runtime_data.coordinator.data:
            if identifier in runtime_data.coordinator.data:
                return False  # session still present
    return True