"""
POI Feature Integrator

Integrates POI features into ML training pipeline.
Fetches POI context from External service and merges features into training data.
"""

import httpx
from typing import Dict, Any, Optional, List
import structlog
import pandas as pd

logger = structlog.get_logger()


class POIFeatureIntegrator:
    """
    POI feature integration for ML training.

    Fetches POI context from External service and adds features
    to training dataframes for location-based demand forecasting.
    """

    def __init__(self, external_service_url: str = "http://external-service:8000"):
        """
        Initialize POI feature integrator.

        Args:
            external_service_url: Base URL for external service
        """
        self.external_service_url = external_service_url.rstrip("/")
        self.poi_context_endpoint = f"{self.external_service_url}/poi-context"

    async def fetch_poi_features(
        self,
        tenant_id: str,
        latitude: float,
        longitude: float,
        force_refresh: bool = False
    ) -> Optional[Dict[str, Any]]:
        """
        Fetch POI features for tenant location.

        First checks if POI context exists, if not, triggers detection.

        Args:
            tenant_id: Tenant UUID
            latitude: Bakery latitude
            longitude: Bakery longitude
            force_refresh: Force re-detection

        Returns:
            Dictionary with POI features or None if detection fails
        """
        try:
            async with httpx.AsyncClient(timeout=60.0) as client:
                # Try to get existing POI context first
                if not force_refresh:
                    try:
                        response = await client.get(
                            f"{self.poi_context_endpoint}/{tenant_id}"
                        )
                        if response.status_code == 200:
                            data = response.json()
                            poi_context = data.get("poi_context", {})

                            # Check if stale
                            if not data.get("is_stale", False):
                                logger.info(
                                    "Using existing POI context",
                                    tenant_id=tenant_id
                                )
                                return poi_context.get("ml_features", {})
                            else:
                                logger.info(
                                    "POI context is stale, refreshing",
                                    tenant_id=tenant_id
                                )
                                force_refresh = True
                    except httpx.HTTPStatusError as e:
                        if e.response.status_code != 404:
                            raise
                        logger.info(
                            "No existing POI context, will detect",
                            tenant_id=tenant_id
                        )

                # Detect or refresh POIs
                logger.info(
                    "Detecting POIs for tenant",
                    tenant_id=tenant_id,
                    location=(latitude, longitude)
                )

                response = await client.post(
                    f"{self.poi_context_endpoint}/{tenant_id}/detect",
                    params={
                        "latitude": latitude,
                        "longitude": longitude,
                        "force_refresh": force_refresh
                    }
                )
                response.raise_for_status()

                result = response.json()
                poi_context = result.get("poi_context", {})
                ml_features = poi_context.get("ml_features", {})

                logger.info(
                    "POI detection completed",
                    tenant_id=tenant_id,
                    total_pois=poi_context.get("total_pois_detected", 0),
                    feature_count=len(ml_features)
                )

                return ml_features

        except httpx.HTTPError as e:
            logger.error(
                "Failed to fetch POI features",
                tenant_id=tenant_id,
                error=str(e),
                exc_info=True
            )
            return None
        except Exception as e:
            logger.error(
                "Unexpected error fetching POI features",
                tenant_id=tenant_id,
                error=str(e),
                exc_info=True
            )
            return None

    def add_poi_features_to_dataframe(
        self,
        df: pd.DataFrame,
        poi_features: Dict[str, Any]
    ) -> pd.DataFrame:
        """
        Add POI features to training dataframe.

        POI features are static (don't vary by date), so they're
        broadcast to all rows in the dataframe.

        Args:
            df: Training dataframe
            poi_features: Dictionary of POI ML features

        Returns:
            Dataframe with POI features added as columns
        """
        if not poi_features:
            logger.warning("No POI features to add")
            return df

        logger.info(
            "Adding POI features to dataframe",
            feature_count=len(poi_features),
            dataframe_rows=len(df)
        )

        # Add each POI feature as a column with constant value
        for feature_name, feature_value in poi_features.items():
            df[feature_name] = feature_value

        logger.info(
            "POI features added successfully",
            new_columns=list(poi_features.keys())
        )

        return df

    def get_poi_feature_names(self, poi_features: Dict[str, Any]) -> List[str]:
        """
        Get list of POI feature names for model registration.

        Args:
            poi_features: Dictionary of POI ML features

        Returns:
            List of feature names
        """
        return list(poi_features.keys()) if poi_features else []

    async def check_poi_service_health(self) -> bool:
        """
        Check if POI service is accessible.

        Returns:
            True if service is healthy, False otherwise
        """
        try:
            async with httpx.AsyncClient(timeout=5.0) as client:
                response = await client.get(
                    f"{self.poi_context_endpoint}/health"
                )
                return response.status_code == 200
        except Exception as e:
            logger.error(
                "POI service health check failed",
                error=str(e)
            )
            return False