"""Datenkoordinator fuer genau ein ninstrip-Geraet."""

from __future__ import annotations

import asyncio
from collections.abc import Awaitable, Callable
from dataclasses import dataclass
from datetime import timedelta
import logging
from typing import Any

from homeassistant.config_entries import ConfigEntry
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import ConfigEntryAuthFailed, HomeAssistantError
from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed

from .api import (
    NinstripAuthError,
    NinstripBusyError,
    NinstripClient,
    NinstripError,
    NinstripRequestError,
)
from .const import CONF_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL, DOMAIN, MAX_POLL_FAILURES

_LOGGER = logging.getLogger(__name__)

type NinstripConfigEntry = ConfigEntry[NinstripCoordinator]


@dataclass(frozen=True, slots=True)
class NinstripData:
    """Letzter bekannter Stand eines Geraets."""

    state: dict[str, Any]
    info: dict[str, Any]
    presets: dict[str, Any]


class NinstripCoordinator(DataUpdateCoordinator[NinstripData]):
    """Fragt ein Geraet ab; jede Anfrage dorthin laeuft durch `lock`."""

    config_entry: NinstripConfigEntry

    def __init__(
        self, hass: HomeAssistant, entry: NinstripConfigEntry, client: NinstripClient
    ) -> None:
        super().__init__(
            hass,
            _LOGGER,
            config_entry=entry,
            name=f"{DOMAIN} {client.host}",
            update_interval=timedelta(
                seconds=entry.options.get(CONF_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL)
            ),
        )
        self.client = client
        # Der ESP32-C3 hat einen Kern, den sich WLAN-Stack und LED-Ausgabe
        # teilen. Mehrere gleichzeitige Anfragen bringen nichts ausser Last.
        self.lock = asyncio.Lock()
        self.ota_in_progress = False
        self._consecutive_poll_failures = 0

    async def _async_update_data(self) -> NinstripData:
        if self.ota_in_progress and self.data is not None:
            return self.data
        try:
            async with self.lock:
                state = await self.client.get_state()
                info = await self.client.get_info()
                presets = await self.client.get_presets()
        except NinstripAuthError as err:
            raise ConfigEntryAuthFailed(f"{self.client.host}: Token abgelehnt") from err
        except NinstripError as err:
            self._consecutive_poll_failures += 1
            if self.data is not None and self._consecutive_poll_failures < MAX_POLL_FAILURES:
                _LOGGER.debug(
                    "%s: Abfrage fehlgeschlagen (%d/%d), behalte den letzten Stand: %s",
                    self.client.host,
                    self._consecutive_poll_failures,
                    MAX_POLL_FAILURES,
                    err,
                )
                return self.data
            raise UpdateFailed(f"{self.client.host}: {err}") from err
        self._consecutive_poll_failures = 0
        return NinstripData(state, info, presets)

    async def async_call[T](self, action: Callable[[NinstripClient], Awaitable[T]]) -> T:
        """Fuehrt eine Anfrage unter der Sperre aus und uebersetzt Fehler fuer die Oberflaeche."""
        try:
            async with self.lock:
                return await action(self.client)
        except NinstripAuthError as err:
            self.config_entry.async_start_reauth(self.hass)
            raise HomeAssistantError(
                translation_domain=DOMAIN, translation_key="auth_failed"
            ) from err
        except NinstripBusyError as err:
            raise HomeAssistantError(
                translation_domain=DOMAIN, translation_key="device_busy"
            ) from err
        except NinstripRequestError as err:
            raise HomeAssistantError(
                translation_domain=DOMAIN,
                translation_key="request_failed",
                translation_placeholders={"message": err.message},
            ) from err
        except NinstripError as err:
            raise HomeAssistantError(
                translation_domain=DOMAIN, translation_key="cannot_connect"
            ) from err

    async def async_set_state(self, **fields: Any) -> None:
        """Schreibt und uebernimmt die vollstaendige Antwort des Geraets direkt."""
        state = await self.async_call(lambda client: client.set_state(**fields))
        self._consecutive_poll_failures = 0
        self.async_set_updated_data(NinstripData(state, self.data.info, self.data.presets))

    async def async_after_change(self) -> None:
        """Nach einem Eingriff, der den ganzen Stand aendern kann (Szene, Segmente)."""
        await self.async_request_refresh()