"""Config flow for Pstryk Energy integration."""
from homeassistant import config_entries
import voluptuous as vol
import aiohttp
import asyncio
import async_timeout
from datetime import timedelta
from homeassistant.util import dt as dt_util
from .const import DOMAIN, API_URL, API_TIMEOUT

class PstrykConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for Pstryk Energy."""
    VERSION = 2

    async def async_step_user(self, user_input=None):
        """Handle the initial step."""
        errors = {}
        if user_input is not None:
            # Sprawdź poprawność API key
            api_key = user_input["api_key"]
            valid = await self._validate_api_key(api_key)
            
            if valid:
                return self.async_create_entry(
                    title="Pstryk Energy", 
                    data=user_input
                )
            else:
                errors["api_key"] = "invalid_api_key"

        return self.async_show_form(
            step_id="user",
            data_schema=vol.Schema({
                vol.Required("api_key"): str,
                vol.Required("buy_top", default=5): vol.All(vol.Coerce(int), vol.Range(min=1, max=24)),
                vol.Required("sell_top", default=5): vol.All(vol.Coerce(int), vol.Range(min=1, max=24)),
                vol.Required("buy_worst", default=5): vol.All(vol.Coerce(int), vol.Range(min=1, max=24)),
                vol.Required("sell_worst", default=5): vol.All(vol.Coerce(int), vol.Range(min=1, max=24))
            }),
            errors=errors
        )
    
    async def _validate_api_key(self, api_key):
        """Validate API key by calling a simple API endpoint."""
        # Używamy endpointu buy z krótkim oknem czasowym dla szybkiego sprawdzenia
        now = dt_util.utcnow()
        start_utc = now.strftime("%Y-%m-%dT%H:%M:%SZ")
        end_utc = (now + timedelta(hours=1)).strftime("%Y-%m-%dT%H:%M:%SZ")
        
        endpoint = f"pricing/?resolution=hour&window_start={start_utc}&window_end={end_utc}"
        url = f"{API_URL}{endpoint}"
        
        try:
            async with aiohttp.ClientSession() as session:
                async with async_timeout.timeout(API_TIMEOUT):
                    resp = await session.get(
                        url,
                        headers={"Authorization": api_key, "Accept": "application/json"}
                    )
                    return resp.status == 200
        except (aiohttp.ClientError, asyncio.TimeoutError):
            return False
    
    @staticmethod
    def async_get_options_flow(config_entry):
        """Get the options flow for this handler."""
        return PstrykOptionsFlowHandler(config_entry)


class PstrykOptionsFlowHandler(config_entries.OptionsFlow):
    """Handle Pstryk options."""

    def __init__(self, config_entry):
        """Initialize options flow."""
        self.config_entry = config_entry

    async def async_step_init(self, user_input=None):
        """Manage the options."""
        if user_input is not None:
            return self.async_create_entry(title="", data=user_input)

        options = {
            vol.Required("buy_top", default=self.config_entry.options.get(
                "buy_top", self.config_entry.data.get("buy_top", 5))): vol.All(
                    vol.Coerce(int), vol.Range(min=1, max=24)),
            vol.Required("sell_top", default=self.config_entry.options.get(
                "sell_top", self.config_entry.data.get("sell_top", 5))): vol.All(
                    vol.Coerce(int), vol.Range(min=1, max=24)),
            vol.Required("buy_worst", default=self.config_entry.options.get(
                "buy_worst", self.config_entry.data.get("buy_worst", 5))): vol.All(
                    vol.Coerce(int), vol.Range(min=1, max=24)),
            vol.Required("sell_worst", default=self.config_entry.options.get(
                "sell_worst", self.config_entry.data.get("sell_worst", 5))): vol.All(
                    vol.Coerce(int), vol.Range(min=1, max=24)),
        }

        return self.async_show_form(
            step_id="init", 
            data_schema=vol.Schema(options)
        )