"""Config flow for AdGuard Control Hub integration."""
import logging
from typing import Any
import voluptuous as vol
from homeassistant import config_entries
from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_PORT, CONF_USERNAME
from homeassistant.helpers.aiohttp_client import async_get_clientsession
from .api import AdGuardHomeAPI
from .const import CONF_SSL, CONF_VERIFY_SSL, DEFAULT_PORT, DEFAULT_SSL, DEFAULT_VERIFY_SSL, DOMAIN

_LOGGER = logging.getLogger(__name__)

STEP_USER_DATA_SCHEMA = vol.Schema({
    vol.Required(CONF_HOST): str,
    vol.Optional(CONF_PORT, default=DEFAULT_PORT): int,
    vol.Optional(CONF_USERNAME): str,
    vol.Optional(CONF_PASSWORD): str,
    vol.Optional(CONF_SSL, default=DEFAULT_SSL): bool,
    vol.Optional(CONF_VERIFY_SSL, default=DEFAULT_VERIFY_SSL): bool,
})

async def validate_input(hass, data: dict) -> dict:
    """Validate the user input allows us to connect."""
    session = async_get_clientsession(hass, data.get(CONF_VERIFY_SSL, True))

    api = AdGuardHomeAPI(
        host=data[CONF_HOST],
        port=data[CONF_PORT], 
        username=data.get(CONF_USERNAME),
        password=data.get(CONF_PASSWORD),
        ssl=data.get(CONF_SSL, False),
        session=session,
    )

    # Test the connection
    if not await api.test_connection():
        raise CannotConnect

    # Get server info
    try:
        status = await api.get_status()
        version = status.get("version", "unknown")
        return {
            "title": f"AdGuard Control Hub ({data[CONF_HOST]})",
            "version": version
        }
    except Exception as err:
        _LOGGER.exception("Unexpected exception: %s", err)
        raise CannotConnect from err

class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for AdGuard Control Hub."""

    VERSION = 1

    async def async_step_user(self, user_input: dict[str, Any] | None = None):
        """Handle the initial step."""
        errors: dict[str, str] = {}

        if user_input is not None:
            try:
                info = await validate_input(self.hass, user_input)
            except CannotConnect:
                errors["base"] = "cannot_connect"
            except Exception:  
                _LOGGER.exception("Unexpected exception")
                errors["base"] = "unknown"
            else:
                # Create unique ID based on host and port
                unique_id = f"{user_input[CONF_HOST]}:{user_input[CONF_PORT]}"
                await self.async_set_unique_id(unique_id)
                self._abort_if_unique_id_configured()

                return self.async_create_entry(
                    title=info["title"],
                    data=user_input,
                )

        return self.async_show_form(
            step_id="user",
            data_schema=STEP_USER_DATA_SCHEMA,
            errors=errors,
        )

class CannotConnect(Exception):
    """Error to indicate we cannot connect."""