"""Config flow fglair: облако / ручной ввод / импорт config_*.json + пробная
сессия (start → ONLINE ≤ 10 c → базовые свойства)."""
from __future__ import annotations

import json
import logging
from functools import partial
from typing import Any

import voluptuous as vol
from homeassistant.config_entries import ConfigFlow, ConfigFlowResult
from homeassistant.helpers import selector

import pyfglair
from pyfglair import Prop, Template
from pyfglair.provision import Device
from pyfglair.templates import detect

from .const import (
    CAP_FAN,
    CAP_HVAC,
    CAP_SWING_HORIZONTAL,
    CAP_SWING_VERTICAL,
    CONF_CONFIG_JSON,
    CONF_DEVICE_PORT,
    CONF_DSN,
    CONF_EMAIL,
    CONF_HOST,
    CONF_LANIP_KEY,
    CONF_LANIP_KEY_ID,
    CONF_LISTEN_PORT,
    CONF_MODEL,
    CONF_NAME,
    CONF_OVERRIDES,
    CONF_PASSWORD,
    CONF_REGION,
    CONF_TEMP_DEN,
    CONF_TEMP_MAX,
    CONF_TEMP_MIN,
    CONF_TEMP_NUM,
    CONF_TEMP_OFFSET,
    CONF_TEMP_STEP,
    CONF_TEMPLATE,
    DEFAULT_DEVICE_PORT,
    DEFAULT_LISTEN_PORT,
    DOMAIN,
    REGIONS,
    TEMP_MAX_TENTHS,
    TEMP_MIN_TENTHS,
    TEMP_STEP_TENTHS,
    TRIAL_ERRORS,
    TRIAL_TIMEOUT,
)
from .trial import TrialResult, trial_connect

_LOGGER = logging.getLogger(__name__)


def _password_selector() -> selector.TextSelector:
    return selector.TextSelector(
        selector.TextSelectorConfig(type=selector.TextSelectorType.PASSWORD)
    )


def _cloud_schema() -> vol.Schema:
    return vol.Schema(
        {
            vol.Required(CONF_EMAIL): str,
            vol.Required(CONF_PASSWORD): _password_selector(),
            vol.Required(CONF_REGION, default="eu"): vol.In(REGIONS),
        }
    )


def _manual_schema() -> vol.Schema:
    return vol.Schema(
        {
            vol.Required(CONF_HOST): str,
            vol.Optional(
                CONF_DEVICE_PORT, default=DEFAULT_DEVICE_PORT
            ): vol.All(int, vol.Range(min=1, max=65535)),
            vol.Required(CONF_DSN): str,
            vol.Required(CONF_LANIP_KEY): _password_selector(),
            vol.Required(CONF_LANIP_KEY_ID): vol.All(int, vol.Range(min=0)),
            vol.Optional(CONF_NAME): str,
            vol.Optional(CONF_MODEL): str,
        }
    )


def _import_schema() -> vol.Schema:
    return vol.Schema(
        {
            vol.Required(CONF_CONFIG_JSON): selector.TextSelector(
                selector.TextSelectorConfig(
                    type=selector.TextSelectorType.TEXT, multiline=True
                )
            )
        }
    )


def _preview_schema(data: dict[str, Any]) -> vol.Schema:
    template = Template[str(data.get(CONF_TEMPLATE, "A"))]
    return vol.Schema(
        {
            vol.Required(CONF_TEMPLATE, default=template.name): vol.In(
                ["A", "B", "F"]
            ),
            vol.Required(CONF_TEMP_MIN, default=16.0): vol.All(
                vol.Coerce(float), vol.Range(min=-10.0, max=45.0)
            ),
            vol.Required(CONF_TEMP_MAX, default=30.0): vol.All(
                vol.Coerce(float), vol.Range(min=-10.0, max=45.0)
            ),
            vol.Required(
                CONF_TEMP_STEP, default=TEMP_STEP_TENTHS[template] / 10
            ): vol.All(vol.Coerce(float), vol.Range(min=0.1, max=5.0)),
            vol.Required(CONF_TEMP_NUM, default=1): vol.All(
                int, vol.Range(min=1, max=1000)
            ),
            vol.Required(CONF_TEMP_DEN, default=1): vol.All(
                int, vol.Range(min=1, max=1000)
            ),
            vol.Required(CONF_TEMP_OFFSET, default=0): vol.All(
                int, vol.Range(min=-1000, max=1000)
            ),
        }
    )


def _preview_text(
    template: Template, properties: dict[Any, Any]
) -> str:
    def raw(prop) -> int | None:
        value = properties.get(prop)
        return value.int_value if value is not None else None

    caps = raw(Prop.DEVICE_CAPABILITIES)

    def supported(bit: int) -> bool:
        return caps is None or bool(caps & (1 << bit))

    hvac = ["off"] + [
        mode.value for mode, bit in CAP_HVAC.items() if supported(bit)
    ]
    fan = [mode for mode, bit in CAP_FAN.items() if supported(bit)]
    tmin, tmax = TEMP_MIN_TENTHS / 10, TEMP_MAX_TENTHS / 10
    step = TEMP_STEP_TENTHS[template] / 10

    lines = [
        f"- HVAC: {', '.join(hvac)}",
        f"- Fan: {', '.join(fan) or '-'}",
        f"- Setpoint: {tmin:.1f}-{tmax:.1f} °C, step {step:.1f} °C",
    ]
    current = raw(Prop.DISPLAY_TEMPERATURE)
    if current is not None:
        lines.append(f"- Current temperature: {current / 10:.1f} °C")
    swings = []
    if supported(CAP_SWING_VERTICAL):
        swings.append("vertical")
    if supported(CAP_SWING_HORIZONTAL):
        swings.append("horizontal")
    if swings:
        lines.append(f"- Swing: {', '.join(swings)}")
    if caps is not None:
        lines.append(f"- Capabilities: 0x{caps:08X}")
    lines.append(f"- Template: {template.name}")
    return "\n".join(lines)


def _template_name(model: str | None) -> str:
    if model:
        found = detect(model)
        if found is not None:
            return found.name
    return Template.A.name


def _manual_data(user_input: dict[str, Any]) -> dict[str, Any]:
    model = str(user_input.get(CONF_MODEL) or "").strip()
    return {
        CONF_HOST: str(user_input[CONF_HOST]).strip(),
        CONF_DEVICE_PORT: int(
            user_input.get(CONF_DEVICE_PORT, DEFAULT_DEVICE_PORT)
        ),
        CONF_DSN: str(user_input[CONF_DSN]).strip(),
        CONF_LANIP_KEY: str(user_input[CONF_LANIP_KEY]).strip(),
        CONF_LANIP_KEY_ID: int(user_input[CONF_LANIP_KEY_ID]),
        CONF_NAME: str(user_input.get(CONF_NAME) or "").strip(),
        CONF_MODEL: model,
        CONF_TEMPLATE: _template_name(model),
    }


def _parse_import(source: str | dict[str, Any]) -> dict[str, Any] | None:
    """config_*.json (fglair-discover/fglctl) → данные записи."""
    if isinstance(source, str):
        try:
            obj = json.loads(source)
        except ValueError:
            return None
    else:
        obj = source
    if not isinstance(obj, dict):
        return None
    host = obj.get("ip_address") or obj.get("host")
    dsn = obj.get("dsn")
    lanip_key = obj.get("lanip_key")
    lanip_key_id = obj.get("lanip_key_id")
    if not host or not dsn or not lanip_key or lanip_key_id is None:
        return None

    def to_int(value: Any) -> int | None:
        try:
            return int(value)
        except (TypeError, ValueError):
            return None

    key_id = to_int(lanip_key_id)
    if key_id is None or key_id < 0:
        return None
    port = to_int(obj.get("device_port", DEFAULT_DEVICE_PORT))
    if port is None or not 1 <= port <= 65535:
        port = DEFAULT_DEVICE_PORT
    model = str(obj.get("model") or "").strip()
    return {
        CONF_HOST: str(host).strip(),
        CONF_DEVICE_PORT: port,
        CONF_DSN: str(dsn).strip(),
        CONF_LANIP_KEY: str(lanip_key).strip(),
        CONF_LANIP_KEY_ID: key_id,
        CONF_NAME: str(obj.get("name") or "").strip(),
        CONF_MODEL: model,
        CONF_TEMPLATE: _template_name(model),
    }


def _run_trial(data: dict[str, Any]) -> TrialResult:
    return trial_connect(
        host=data[CONF_HOST],
        dsn=data[CONF_DSN],
        lanip_key=data[CONF_LANIP_KEY],
        lanip_key_id=int(data[CONF_LANIP_KEY_ID]),
        device_port=int(data.get(CONF_DEVICE_PORT, DEFAULT_DEVICE_PORT)),
        template=Template[str(data.get(CONF_TEMPLATE, "A"))],
        listen_port=int(data.get(CONF_LISTEN_PORT, DEFAULT_LISTEN_PORT)),
        timeout=TRIAL_TIMEOUT,
    )


class FglairConfigFlow(ConfigFlow, domain=DOMAIN):
    """Настройка интеграции: облако, ручной ввод или импорт."""

    VERSION = 1

    def __init__(self) -> None:
        self._devices: list[Device] = []
        self._pending_data: dict[str, Any] = {}
        self._trial_properties: dict[Any, Any] = {}

    def _show_form(
        self,
        step_id: str,
        schema: vol.Schema,
        errors: dict[str, str],
        user_input: dict[str, Any] | None = None,
        *,
        exclude: tuple[str, ...] = (),
    ) -> ConfigFlowResult:
        """Показывает форму, возвращая введённые значения (кроме секретов)."""
        if user_input:
            suggested = {
                key: value
                for key, value in user_input.items()
                if key not in exclude
            }
            schema = self.add_suggested_values_to_schema(schema, suggested)
        return self.async_show_form(
            step_id=step_id, data_schema=schema, errors=errors
        )

    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        return self.async_show_menu(
            step_id="user", menu_options=["cloud", "manual", "import_json"]
        )

    async def async_step_cloud(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        errors: dict[str, str] = {}
        if user_input is not None:
            try:
                self._devices = await pyfglair.discover(
                    user_input[CONF_EMAIL],
                    user_input[CONF_PASSWORD],
                    user_input[CONF_REGION],
                )
            except pyfglair.ProvisionError as err:
                _LOGGER.debug("discover не удался: %s", err)
                errors["base"] = {
                    "auth": "invalid_auth",
                    "no_devices": "no_devices",
                }.get(err.kind, "cannot_connect")
            except Exception:  # pragma: no cover - защитный путь
                _LOGGER.exception("discover: неожиданная ошибка")
                errors["base"] = "cannot_connect"
            else:
                if not self._devices:
                    errors["base"] = "no_devices"
                else:
                    return await self.async_step_cloud_device()
        return self._show_form(
            "cloud", _cloud_schema(), errors, user_input,
            exclude=(CONF_PASSWORD,),
        )

    async def async_step_cloud_device(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        errors: dict[str, str] = {}
        if user_input is not None:
            device = next(
                (d for d in self._devices if d.dsn == user_input[CONF_DSN]), None
            )
            if device is None:
                errors["base"] = "unknown"
            else:
                data = {
                    CONF_HOST: device.lan_ip or device.dsn,
                    CONF_DEVICE_PORT: DEFAULT_DEVICE_PORT,
                    CONF_DSN: device.dsn,
                    CONF_LANIP_KEY: device.lanip_key,
                    CONF_LANIP_KEY_ID: device.lanip_key_id,
                    CONF_NAME: device.name,
                    CONF_MODEL: device.model,
                    CONF_TEMPLATE: _template_name(device.model),
                    CONF_REGION: device.region,
                }
                error = await self._async_trial(data)
                if error is None:
                    return await self.async_step_preview()
                errors["base"] = error
        schema = vol.Schema(
            {
                vol.Required(CONF_DSN): vol.In(
                    {
                        d.dsn: f"{d.name} ({d.model or '?'}, {d.lan_ip or '?'})"
                        for d in self._devices
                    }
                )
            }
        )
        return self._show_form("cloud_device", schema, errors, user_input)

    async def async_step_manual(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        errors: dict[str, str] = {}
        if user_input is not None:
            data = _manual_data(user_input)
            error = await self._async_trial(data)
            if error is None:
                return await self.async_step_preview()
            errors["base"] = error
        return self._show_form(
            "manual", _manual_schema(), errors, user_input,
            exclude=(CONF_LANIP_KEY,),
        )

    async def async_step_import_json(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        errors: dict[str, str] = {}
        if user_input is not None:
            data = _parse_import(user_input[CONF_CONFIG_JSON])
            if data is None:
                errors["base"] = "invalid_import"
            else:
                error = await self._async_trial(data)
                if error is None:
                    return await self.async_step_preview()
                errors["base"] = error
        return self._show_form("import_json", _import_schema(), errors, user_input)

    async def async_step_import(
        self, import_data: dict[str, Any]
    ) -> ConfigFlowResult:
        """Импорт из configuration.yaml / discovery-конфига."""
        data = _parse_import(import_data) if isinstance(import_data, dict) else None
        if data is None:
            return self.async_abort(reason="invalid_import")
        error = await self._async_trial(data)
        if error is not None:
            return self.async_abort(reason=error)
        return self._create_entry(data)

    async def async_step_preview(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Шаг 3: превью шаблона и ручные конверсии/диапазон уставки."""
        data = dict(self._pending_data)
        errors: dict[str, str] = {}
        if user_input is not None:
            template = Template[user_input[CONF_TEMPLATE]]
            temp_min = int(round(float(user_input[CONF_TEMP_MIN]) * 10))
            temp_max = int(round(float(user_input[CONF_TEMP_MAX]) * 10))
            step = int(round(float(user_input[CONF_TEMP_STEP]) * 10))
            if temp_min >= temp_max:
                errors["base"] = "invalid_range"
            elif step <= 0:
                errors["base"] = "invalid_range"
            else:
                data[CONF_TEMPLATE] = template.name
                data[CONF_TEMP_STEP] = step
                data[CONF_OVERRIDES] = {
                    Prop.ADJUST_TEMPERATURE.name.lower(): {
                        "num": int(user_input[CONF_TEMP_NUM]),
                        "den": int(user_input[CONF_TEMP_DEN]),
                        "offset": int(user_input[CONF_TEMP_OFFSET]),
                        "min": temp_min,
                        "max": temp_max,
                    }
                }
                _LOGGER.debug(
                    "превью: template=%s range=%d..%d step=%d",
                    template.name, temp_min, temp_max, step,
                )
                return self._create_entry(data)
        schema = _preview_schema(data)
        if user_input is None:
            user_input = {
                CONF_TEMPLATE: data.get(CONF_TEMPLATE, Template.A.name),
            }
        return self.async_show_form(
            step_id="preview",
            data_schema=self.add_suggested_values_to_schema(schema, user_input),
            errors=errors,
            description_placeholders={
                "preview": _preview_text(
                    Template[str(data.get(CONF_TEMPLATE, "A"))],
                    self._trial_properties,
                )
            },
        )

    async def _async_trial(self, data: dict[str, Any]) -> str | None:
        """None — сессия поднялась; иначе ключ ошибки формы."""
        await self.async_set_unique_id(data[CONF_DSN], raise_on_progress=False)
        self._abort_if_unique_id_configured()
        result: TrialResult = await self.hass.async_add_executor_job(
            partial(_run_trial, data)
        )
        if result.ok:
            self._pending_data = data
            self._trial_properties = result.properties
            return None
        _LOGGER.debug(
            "пробное подключение не удалось: reason=%s state=%s error=%s",
            result.reason, result.state, result.error,
        )
        return TRIAL_ERRORS.get(result.reason, "cannot_connect")

    def _create_entry(self, data: dict[str, Any]) -> ConfigFlowResult:
        title = data.get(CONF_NAME) or data[CONF_DSN]
        return self.async_create_entry(title=title, data=data)