"""UI-only installation and reconfiguration: zones, source priorities, weights."""
from __future__ import annotations

from typing import Any
from uuid import uuid4

import voluptuous as vol
from homeassistant import config_entries
from homeassistant.core import callback
from homeassistant.helpers import selector

from .const import (
    CONF_ROOM_MAX_AGE, CONF_ROOM_STALE_KEEP, CONF_WEATHER_MAX_AGE,
    DOMAIN, CONF_CLIMATE, CONF_HEATER, CONF_OUTSIDE, CONF_ROOMS,
    CONF_HORIZON, CONF_MIN_ON, CONF_MIN_OFF,
    CONF_SWITCH_COST, CONF_HEAT_COST, CONF_BAND, CONF_INTERNAL_HALF_LIFE, DEFAULTS,
    CONF_RECOVERY_MINUTES, CONF_VENT_CROSS, CONF_VENT_GUST, CONF_VENT_WIND, CONF_WINDOW_OPEN_MINUTES,
    WEATHER_SOURCES, WEATHER_MAIN, WEATHER_EXTRA,
)
from .heat_sources import (
    BASELINE_AUTO, BASELINE_MANUAL, DEFAULT_RESPONSE_MINUTES, MAX_POWER_W, RESPONSE_MINUTES_RANGE,
    SOURCE_BASELINE_MODE, SOURCE_BASELINE_W, SOURCE_ENABLED, SOURCE_FRACTION, SOURCE_INCLUDED_IN,
    SOURCE_KEY, SOURCE_NAME, SOURCE_RESPONSE, SOURCE_SENSOR, SOURCE_ZONE, SUBENTRY_HEAT_SOURCE,
    HeatSource, build_sources, validate_source,
)
from .coordinator import async_reset_learned_model
from .weather_sources import sources_for
from .windows import (
    DEFAULT_AZIMUTH, OPENING_RANGE, SUBENTRY_WINDOW, WINDOW_AZIMUTH, WINDOW_ENABLED, WINDOW_INVERTED,
    WINDOW_KEY, WINDOW_NAME, WINDOW_OPENING, WINDOW_SENSOR, WINDOW_ZONE, Window, build_windows,
    validate_window,
)
from .zones import (
    COMFORT_WEIGHT_RANGE, SENSOR_WEIGHT_RANGE, SUBENTRY_ZONE, TARGET_OFFSET_RANGE,
    ZONE_COMFORT_WEIGHT, ZONE_KEY, ZONE_NAME, ZONE_NEIGHBORS, ZONE_SENSOR_WEIGHTS,
    ZONE_SENSORS, ZONE_TARGET_OFFSET, Zone, build_zones, legacy_zone_data, validate_zone,
)


def _entity_picker(multiple: bool = False):
    return selector.EntitySelector(
        selector.EntitySelectorConfig(domain="sensor", multiple=multiple,
                                      **({"reorder": True} if multiple else {}))
    )


def _required(key: str, data: dict):
    return vol.Required(key, default=data[key]) if key in data else vol.Required(key)


def _main_schema(config: dict[str, Any] | None = None, detailed: bool = False):
    """Setup asks for room sensors (one zone each); Configure manages zones separately."""
    data = config or {}
    schema: dict[Any, Any] = {
        _required(CONF_CLIMATE, data): selector.EntitySelector(
            selector.EntitySelectorConfig(domain="climate")),
        _required(CONF_HEATER, data): selector.EntitySelector(
            selector.EntitySelectorConfig(domain="switch")),
    }
    if not detailed:
        schema[_required(CONF_ROOMS, data)] = _entity_picker(multiple=True)
    for key in (CONF_ROOM_MAX_AGE, CONF_WEATHER_MAX_AGE):
        schema[vol.Required(key, default=data.get(key, DEFAULTS[key]))] = vol.All(
            vol.Coerce(int), vol.Range(min=5, max=1440))
    schema[vol.Required(CONF_ROOM_STALE_KEEP, default=bool(
        data.get(CONF_ROOM_STALE_KEEP, DEFAULTS[CONF_ROOM_STALE_KEEP])))] = selector.BooleanSelector()
    if detailed:
        for key, allowed in {
            CONF_HORIZON: vol.In([60, 90, 120, 150, 180]),
            CONF_MIN_ON: vol.All(vol.Coerce(int), vol.Range(min=5, max=60)),
            CONF_MIN_OFF: vol.All(vol.Coerce(int), vol.Range(min=5, max=60)),
            CONF_SWITCH_COST: vol.All(vol.Coerce(float), vol.Range(min=0, max=5)),
            CONF_HEAT_COST: vol.All(vol.Coerce(float), vol.Range(min=0, max=5)),
            CONF_BAND: vol.All(vol.Coerce(float), vol.Range(min=0.05, max=0.7)),
            CONF_INTERNAL_HALF_LIFE: vol.All(vol.Coerce(int), vol.Range(min=0, max=720)),
            CONF_WINDOW_OPEN_MINUTES: vol.All(vol.Coerce(int), vol.Range(min=5, max=120)),
            CONF_RECOVERY_MINUTES: vol.All(vol.Coerce(int), vol.Range(min=5, max=120)),
        }.items():
            schema[vol.Required(key, default=data.get(key, DEFAULTS[key]))] = allowed
        for key in (CONF_VENT_WIND, CONF_VENT_GUST, CONF_VENT_CROSS):
            schema[vol.Required(key, default=bool(data.get(key, DEFAULTS[key])))] = selector.BooleanSelector()
    return vol.Schema(schema)


def _weather_schema(config: dict[str, Any], metrics: tuple[str, ...]):
    schema = {}
    for metric in metrics:
        key = WEATHER_SOURCES[metric]
        selected = sources_for(config, metric)
        if metric == "temperature":
            # A temperature source is mandatory: other weather inputs are optional.
            marker = vol.Required(key, default=selected) if selected else vol.Required(key)
        else:
            # A default would re-insert old sources whenever a cleared field is
            # omitted from the submission; a suggested value only pre-fills the form.
            marker = vol.Optional(key, description={"suggested_value": selected})
        schema[marker] = _entity_picker(multiple=True)
    return vol.Schema(schema)


def _with_cleared_weather(user_input: dict[str, Any], metrics: tuple[str, ...]) -> dict[str, Any]:
    """Store an omitted optional source list as empty, so it overrides older data."""
    result = dict(user_input)
    for metric in metrics:
        result.setdefault(WEATHER_SOURCES[metric], [])
    return result


def _weight_schema(rooms: list[str], existing: dict[str, float] | None = None):
    weights = existing or {}
    return vol.Schema({
        vol.Required(f"weight__{room}", default=weights.get(room, 1.0)):
            vol.All(vol.Coerce(float), vol.Range(min=0.1, max=10))
        for room in rooms
    })


def _valid_rooms(rooms: list[str]) -> bool:
    return bool(rooms) and len(rooms) <= 12 and len(rooms) == len(set(rooms))


def _valid_weather(rooms: list[str], data: dict) -> bool:
    sources = sources_for(data, "temperature")
    return bool(sources) and len(sources) <= 10 and not set(sources).intersection(rooms)


def entry_zones(entry: config_entries.ConfigEntry) -> list[Zone]:
    """Zones of a config entry, from its zone subentries."""
    return build_zones((sub.data, sub.subentry_id) for sub in entry.subentries.values()
                       if sub.subentry_type == SUBENTRY_ZONE)


def entry_sources(entry: config_entries.ConfigEntry) -> list[HeatSource]:
    zones = {zone.key for zone in entry_zones(entry)}
    return build_sources(((sub.data, sub.subentry_id) for sub in entry.subentries.values()
                          if sub.subentry_type == SUBENTRY_HEAT_SOURCE), zones)


def _number(lo: float, hi: float, step: float) -> selector.NumberSelector:
    return selector.NumberSelector(selector.NumberSelectorConfig(
        min=lo, max=hi, step=step, mode=selector.NumberSelectorMode.BOX))


class HeatingMPCConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Create a native observation-only MPC installation."""

    # 3: rooms and comfort weights moved into zone subentries.
    VERSION = 3

    def __init__(self):
        self._draft: dict[str, Any] = {}

    async def async_step_user(self, user_input: dict[str, Any] | None = None):
        if user_input is not None:
            if not _valid_rooms(user_input[CONF_ROOMS]):
                return self.async_show_form(step_id="user", data_schema=_main_schema(),
                                            errors={"base": "invalid_rooms"})
            await self.async_set_unique_id("home_heating")
            self._abort_if_unique_id_configured()
            self._draft = user_input
            return await self.async_step_weather()
        return self.async_show_form(step_id="user", data_schema=_main_schema())

    async def async_step_weather(self, user_input: dict[str, Any] | None = None):
        if user_input is not None:
            if not _valid_weather(self._draft[CONF_ROOMS], user_input):
                return self.async_show_form(step_id="weather", data_schema=_weather_schema(
                    user_input, WEATHER_MAIN), errors={"base": "invalid_weather"})
            self._draft.update(_with_cleared_weather(user_input, WEATHER_MAIN))
            return await self.async_step_weather_extra()
        return self.async_show_form(step_id="weather", data_schema=_weather_schema(
            self._draft, WEATHER_MAIN))

    async def async_step_weather_extra(self, user_input: dict[str, Any] | None = None):
        if user_input is not None:
            self._draft.update(_with_cleared_weather(user_input, WEATHER_EXTRA))
            return await self.async_step_weights()
        return self.async_show_form(step_id="weather_extra", data_schema=_weather_schema(
            self._draft, WEATHER_EXTRA))

    async def async_step_weights(self, user_input: dict[str, Any] | None = None):
        if user_input is not None:
            rooms = self._draft.pop(CONF_ROOMS)
            weights = {room: float(user_input[f"weight__{room}"]) for room in rooms}
            names = {}
            for room in rooms:
                state = self.hass.states.get(room)
                names[room] = state.name if state else room
            # Each chosen sensor becomes its own zone; zones can be edited later.
            zones = [{"data": data, "subentry_type": SUBENTRY_ZONE, "title": data[ZONE_NAME],
                      "unique_id": data[ZONE_KEY]}
                     for data in legacy_zone_data(rooms, weights, names)]
            return self.async_create_entry(title="Heating MPC", data=self._draft, subentries=zones)
        return self.async_show_form(step_id="weights", data_schema=_weight_schema(
            self._draft[CONF_ROOMS]))

    @staticmethod
    @callback
    def async_get_options_flow(config_entry: config_entries.ConfigEntry):
        return HeatingMPCOptionsFlow()

    @classmethod
    @callback
    def async_get_supported_subentry_types(cls, config_entry: config_entries.ConfigEntry):
        return {SUBENTRY_ZONE: ZoneSubentryFlow, SUBENTRY_HEAT_SOURCE: HeatSourceSubentryFlow,
                SUBENTRY_WINDOW: WindowSubentryFlow}


CONFIRM_RESET = "confirm_reset"


class HeatingMPCOptionsFlow(config_entries.OptionsFlow):
    """Edit sensors, ranked alternative weather providers and MPC parameters."""

    def __init__(self):
        self._draft: dict[str, Any] = {}

    def _zone_sensors(self) -> list[str]:
        return [sensor for zone in entry_zones(self.config_entry) for sensor in zone.sensors]

    async def async_step_init(self, user_input: dict[str, Any] | None = None):
        return self.async_show_menu(step_id="init", menu_options=["settings", "reset_model"])

    async def async_step_settings(self, user_input: dict[str, Any] | None = None):
        config = {**self.config_entry.data, **self.config_entry.options}
        if user_input is not None:
            self._draft = user_input
            return await self.async_step_weather()
        return self.async_show_form(step_id="settings", data_schema=_main_schema(
            config, detailed=True))

    async def async_step_reset_model(self, user_input: dict[str, Any] | None = None):
        """Forget the learned model after an explicit confirmation; settings stay."""
        if user_input is not None:
            if user_input.get(CONFIRM_RESET) is not True:
                return self.async_abort(reason="model_not_reset")
            await async_reset_learned_model(self.hass, self.config_entry)
            return self.async_abort(reason="model_reset")
        return self.async_show_form(step_id="reset_model", data_schema=vol.Schema(
            {vol.Required(CONFIRM_RESET, default=False): selector.BooleanSelector()}))

    async def async_step_weather(self, user_input: dict[str, Any] | None = None):
        config = {**self.config_entry.data, **self.config_entry.options, **self._draft}
        if user_input is not None:
            if not _valid_weather(self._zone_sensors(), user_input):
                return self.async_show_form(step_id="weather", data_schema=_weather_schema(
                    user_input, WEATHER_MAIN), errors={"base": "invalid_weather"})
            self._draft.update(_with_cleared_weather(user_input, WEATHER_MAIN))
            return await self.async_step_weather_extra()
        return self.async_show_form(step_id="weather", data_schema=_weather_schema(
            config, WEATHER_MAIN))

    async def async_step_weather_extra(self, user_input: dict[str, Any] | None = None):
        config = {**self.config_entry.data, **self.config_entry.options, **self._draft}
        if user_input is not None:
            self._draft.update(_with_cleared_weather(user_input, WEATHER_EXTRA))
            # Prevent an old single-temperature sensor from overriding new sources.
            self._draft.pop(CONF_OUTSIDE, None)
            return self.async_create_entry(title="", data=self._draft)
        return self.async_show_form(step_id="weather_extra", data_schema=_weather_schema(
            config, WEATHER_EXTRA))


class ZoneSubentryFlow(config_entries.ConfigSubentryFlow):
    """Add or edit a thermal zone: its sensors, comfort weight and neighbours."""

    def __init__(self) -> None:
        self._draft: dict[str, Any] = {}

    def _other_zones(self, key: str | None) -> list[Zone]:
        return [zone for zone in entry_zones(self._get_entry()) if zone.key != key]

    def _schema(self, data: dict[str, Any], key: str | None) -> vol.Schema:
        schema: dict[Any, Any] = {
            vol.Required(ZONE_NAME, default=data.get(ZONE_NAME, "")): selector.TextSelector(),
            vol.Required(ZONE_SENSORS, default=list(data.get(ZONE_SENSORS, []))):
                _entity_picker(multiple=True),
            vol.Required(ZONE_COMFORT_WEIGHT, default=data.get(ZONE_COMFORT_WEIGHT, 1.0)):
                _number(*COMFORT_WEIGHT_RANGE, 0.1),
            vol.Required(ZONE_TARGET_OFFSET, default=data.get(ZONE_TARGET_OFFSET, 0.0)):
                _number(*TARGET_OFFSET_RANGE, 0.1),
        }
        others = self._other_zones(key)
        if others:
            schema[vol.Optional(ZONE_NEIGHBORS, description={
                "suggested_value": [n for n in data.get(ZONE_NEIGHBORS, []) if n in {z.key for z in others}]})] = \
                selector.SelectSelector(selector.SelectSelectorConfig(
                    options=[selector.SelectOptionDict(value=z.key, label=z.name) for z in others],
                    multiple=True, mode=selector.SelectSelectorMode.LIST))
        return vol.Schema(schema)

    async def _zone_form(self, step_id: str, user_input: dict[str, Any] | None,
                         existing: dict[str, Any], key: str | None):
        if user_input is not None:
            entry = self._get_entry()
            config = {**entry.data, **entry.options}
            weather = {s for metric in ("temperature",) for s in sources_for(config, metric)}
            error = validate_zone(user_input, self._other_zones(key), weather)
            if error:
                return self.async_show_form(step_id=step_id, data_schema=self._schema(user_input, key),
                                            errors={"base": error})
            self._draft = {**existing, **user_input, ZONE_NAME: user_input[ZONE_NAME].strip()}
            self._draft.setdefault(ZONE_NEIGHBORS, [])
            if len(user_input[ZONE_SENSORS]) > 1:
                return await self.async_step_sensor_weights()
            self._draft[ZONE_SENSOR_WEIGHTS] = {user_input[ZONE_SENSORS][0]: 1.0}
            return self._finish()
        return self.async_show_form(step_id=step_id, data_schema=self._schema(existing, key))

    async def async_step_user(self, user_input: dict[str, Any] | None = None):
        if not self._draft.get(ZONE_KEY):
            self._draft = {ZONE_KEY: f"zone_{uuid4().hex[:10]}"}
        return await self._zone_form("user", user_input, self._draft, None)

    async def async_step_reconfigure(self, user_input: dict[str, Any] | None = None):
        subentry = self._get_reconfigure_subentry()
        existing = dict(subentry.data)
        existing.setdefault(ZONE_KEY, subentry.subentry_id)
        return await self._zone_form("reconfigure", user_input, existing, existing[ZONE_KEY])

    async def async_step_sensor_weights(self, user_input: dict[str, Any] | None = None):
        """One weight per sensor; fields are numbered so they have translated labels."""
        sensors = self._draft[ZONE_SENSORS]
        if user_input is not None:
            self._draft[ZONE_SENSOR_WEIGHTS] = {
                s: float(user_input[f"sensor_weight_{i}"]) for i, s in enumerate(sensors, 1)}
            return self._finish()
        weights = self._draft.get(ZONE_SENSOR_WEIGHTS) or {}
        names = []
        for i, sensor in enumerate(sensors, 1):
            state = self.hass.states.get(sensor)
            names.append(f"{i}. {state.name if state else sensor} ({sensor})")
        return self.async_show_form(
            step_id="sensor_weights",
            data_schema=vol.Schema({
                vol.Required(f"sensor_weight_{i}", default=weights.get(s, 1.0)): _number(*SENSOR_WEIGHT_RANGE, 0.1)
                for i, s in enumerate(sensors, 1)}),
            description_placeholders={"sensors": "\n".join(names)})

    def _finish(self):
        data = {key: self._draft[key] for key in (
            ZONE_KEY, ZONE_NAME, ZONE_SENSORS, ZONE_SENSOR_WEIGHTS, ZONE_COMFORT_WEIGHT,
            ZONE_TARGET_OFFSET, ZONE_NEIGHBORS)}
        data[ZONE_COMFORT_WEIGHT] = float(data[ZONE_COMFORT_WEIGHT])
        data[ZONE_TARGET_OFFSET] = float(data[ZONE_TARGET_OFFSET])
        if self.source == config_entries.SOURCE_RECONFIGURE:
            return self.async_update_and_abort(self._get_entry(), self._get_reconfigure_subentry(),
                                               title=data[ZONE_NAME], data=data)
        return self.async_create_entry(title=data[ZONE_NAME], data=data, unique_id=data[ZONE_KEY])


class HeatSourceSubentryFlow(config_entries.ConfigSubentryFlow):
    """Add or edit an electrical heat source (UPS, PC, server) in a zone."""

    def _others(self, key: str | None) -> list[HeatSource]:
        return [s for s in entry_sources(self._get_entry()) if s.key != key]

    def _schema(self, data: dict[str, Any], key: str | None) -> vol.Schema:
        zones = entry_zones(self._get_entry())
        parents = [s for s in self._others(key) if s.included_in is None]
        schema: dict[Any, Any] = {
            vol.Required(SOURCE_NAME, default=data.get(SOURCE_NAME, "")): selector.TextSelector(),
            vol.Required(SOURCE_SENSOR, **({"default": data[SOURCE_SENSOR]} if data.get(SOURCE_SENSOR) else {})):
                selector.EntitySelector(selector.EntitySelectorConfig(domain="sensor", device_class="power")),
            vol.Required(SOURCE_ZONE, **({"default": data[SOURCE_ZONE]} if data.get(SOURCE_ZONE) else {})):
                selector.SelectSelector(selector.SelectSelectorConfig(
                    options=[selector.SelectOptionDict(value=z.key, label=z.name) for z in zones])),
            vol.Required(SOURCE_FRACTION, default=data.get(SOURCE_FRACTION, 1.0)): _number(0.0, 1.0, 0.05),
            vol.Required(SOURCE_BASELINE_MODE, default=data.get(SOURCE_BASELINE_MODE, BASELINE_AUTO)):
                selector.SelectSelector(selector.SelectSelectorConfig(
                    options=[BASELINE_AUTO, BASELINE_MANUAL], translation_key=SOURCE_BASELINE_MODE)),
            vol.Optional(SOURCE_BASELINE_W, description={"suggested_value": data.get(SOURCE_BASELINE_W)}):
                _number(0.0, MAX_POWER_W, 1.0),
            vol.Required(SOURCE_RESPONSE, default=data.get(SOURCE_RESPONSE, DEFAULT_RESPONSE_MINUTES)):
                _number(*RESPONSE_MINUTES_RANGE, 1.0),
            vol.Required(SOURCE_ENABLED, default=data.get(SOURCE_ENABLED, True)): selector.BooleanSelector(),
        }
        if parents:
            schema[vol.Optional(SOURCE_INCLUDED_IN, description={
                "suggested_value": data.get(SOURCE_INCLUDED_IN)})] = selector.SelectSelector(
                selector.SelectSelectorConfig(options=[
                    selector.SelectOptionDict(value=s.key, label=s.name) for s in parents]))
        return vol.Schema(schema)

    async def _form(self, step_id: str, user_input: dict[str, Any] | None, existing: dict[str, Any]):
        key = existing[SOURCE_KEY]
        if not entry_zones(self._get_entry()):
            return self.async_abort(reason="no_zones")
        if user_input is not None:
            data = {**existing, **user_input, SOURCE_KEY: key}
            data.setdefault(SOURCE_INCLUDED_IN, None)
            error = validate_source(data, self._others(key))
            if error:
                return self.async_show_form(step_id=step_id, data_schema=self._schema(data, key),
                                            errors={"base": error})
            data[SOURCE_NAME] = data[SOURCE_NAME].strip()
            for number in (SOURCE_FRACTION, SOURCE_RESPONSE):
                data[number] = float(data[number])
            if data.get(SOURCE_BASELINE_W) is not None:
                data[SOURCE_BASELINE_W] = float(data[SOURCE_BASELINE_W])
            if self.source == config_entries.SOURCE_RECONFIGURE:
                return self.async_update_and_abort(self._get_entry(), self._get_reconfigure_subentry(),
                                                   title=data[SOURCE_NAME], data=data)
            return self.async_create_entry(title=data[SOURCE_NAME], data=data, unique_id=key)
        return self.async_show_form(step_id=step_id, data_schema=self._schema(existing, key))

    async def async_step_user(self, user_input: dict[str, Any] | None = None):
        if not hasattr(self, "_key"):
            self._key = f"source_{uuid4().hex[:10]}"
        return await self._form("user", user_input, {SOURCE_KEY: self._key})

    async def async_step_reconfigure(self, user_input: dict[str, Any] | None = None):
        subentry = self._get_reconfigure_subentry()
        existing = dict(subentry.data)
        existing.setdefault(SOURCE_KEY, subentry.subentry_id)
        return await self._form("reconfigure", user_input, existing)


def entry_windows(entry: config_entries.ConfigEntry) -> list[Window]:
    zones = {zone.key for zone in entry_zones(entry)}
    return build_windows(((sub.data, sub.subentry_id) for sub in entry.subentries.values()
                          if sub.subentry_type == SUBENTRY_WINDOW), zones)


class WindowSubentryFlow(config_entries.ConfigSubentryFlow):
    """Add or edit a window contact sensor with its zone and orientation."""

    def _schema(self, data: dict[str, Any]) -> vol.Schema:
        zones = entry_zones(self._get_entry())
        return vol.Schema({
            vol.Required(WINDOW_NAME, default=data.get(WINDOW_NAME, "")): selector.TextSelector(),
            vol.Required(WINDOW_SENSOR, **({"default": data[WINDOW_SENSOR]} if data.get(WINDOW_SENSOR) else {})):
                selector.EntitySelector(selector.EntitySelectorConfig(domain="binary_sensor")),
            vol.Required(WINDOW_ZONE, **({"default": data[WINDOW_ZONE]} if data.get(WINDOW_ZONE) else {})):
                selector.SelectSelector(selector.SelectSelectorConfig(
                    options=[selector.SelectOptionDict(value=z.key, label=z.name) for z in zones])),
            vol.Required(WINDOW_INVERTED, default=data.get(WINDOW_INVERTED, False)): selector.BooleanSelector(),
            vol.Required(WINDOW_AZIMUTH, default=data.get(WINDOW_AZIMUTH, DEFAULT_AZIMUTH)):
                _number(0.0, 359.0, 1.0),
            vol.Required(WINDOW_OPENING, default=data.get(WINDOW_OPENING, 1.0)): _number(*OPENING_RANGE, 0.1),
            vol.Required(WINDOW_ENABLED, default=data.get(WINDOW_ENABLED, True)): selector.BooleanSelector(),
        })

    async def _form(self, step_id: str, user_input: dict[str, Any] | None, existing: dict[str, Any]):
        key = existing[WINDOW_KEY]
        if not entry_zones(self._get_entry()):
            return self.async_abort(reason="no_zones")
        if user_input is not None:
            data = {**existing, **user_input, WINDOW_KEY: key}
            error = validate_window(data, [w for w in entry_windows(self._get_entry()) if w.key != key])
            if error:
                return self.async_show_form(step_id=step_id, data_schema=self._schema(data),
                                            errors={"base": error})
            data[WINDOW_NAME] = data[WINDOW_NAME].strip()
            data[WINDOW_AZIMUTH] = float(data[WINDOW_AZIMUTH])
            data[WINDOW_OPENING] = float(data[WINDOW_OPENING])
            if self.source == config_entries.SOURCE_RECONFIGURE:
                return self.async_update_and_abort(self._get_entry(), self._get_reconfigure_subentry(),
                                                   title=data[WINDOW_NAME], data=data)
            return self.async_create_entry(title=data[WINDOW_NAME], data=data, unique_id=key)
        return self.async_show_form(step_id=step_id, data_schema=self._schema(existing))

    async def async_step_user(self, user_input: dict[str, Any] | None = None):
        if not hasattr(self, "_key"):
            self._key = f"window_{uuid4().hex[:10]}"
        return await self._form("user", user_input, {WINDOW_KEY: self._key})

    async def async_step_reconfigure(self, user_input: dict[str, Any] | None = None):
        subentry = self._get_reconfigure_subentry()
        existing = dict(subentry.data)
        existing.setdefault(WINDOW_KEY, subentry.subentry_id)
        return await self._form("reconfigure", user_input, existing)