"""
Health Connect Provider - Implementation for Health Connect API.

This module provides the Health Connect implementation that reads data
pushed from the Android companion app via the /api/health-connect/sync endpoint.
"""
import datetime
from typing import Dict, Any, List, Optional

from backend.integrations.health_provider import (
    HealthDataProvider, 
    DataSource, 
    HealthProviderFactory
)


class HealthConnectProvider(HealthDataProvider):
    """
    Health Connect implementation of HealthDataProvider.
    
    This provider reads data that has been pushed from an Android companion app
    via the /api/health-connect/sync endpoint and stored in the database.
    """
    
    @property
    def source(self) -> DataSource:
        return DataSource.HEALTH_CONNECT
    
    def get_auth_url(self) -> str:
        """
        Health Connect doesn't use OAuth - permissions are granted on-device.
        
        Returns a URL to download the Android companion app.
        """
        # TODO: Replace with actual Play Store URL when app is published
        return "https://play.google.com/store/apps/details?id=com.habitforge.companion"
    
    async def fetch_daily_metrics(
        self, 
        access_token: Optional[str],  # Not used for Health Connect, but required by interface
        days: int = 7, 
        timezone: str = "UTC",
        user_id: Optional[int] = None
    ) -> List[Dict[str, Any]]:
        """
        Fetch daily metrics from Health Connect data store.
        
        Reads data that was pushed from the Android companion app.
        """
        if not user_id:
            print("[HealthConnect] ERROR: user_id is required")
            return []
        
        print(f"[HealthConnect] Fetching daily metrics for user {user_id}, last {days} days")
        
        from backend.database import SessionLocal
        from backend.models.health_connect import HealthConnectDailyMetrics
        from datetime import timedelta, date as date_type
        
        db = SessionLocal()
        try:
            start_date = date_type.today() - timedelta(days=days)
            
            metrics = db.query(HealthConnectDailyMetrics).filter(
                HealthConnectDailyMetrics.user_id == user_id,
                HealthConnectDailyMetrics.date >= start_date
            ).order_by(HealthConnectDailyMetrics.date.desc()).all()
            
            if not metrics:
                print(f"[HealthConnect] No data found. Ensure Android app has synced data.")
                return []
            
            print(f"[HealthConnect] Found {len(metrics)} days of data")
            
            # Convert to standard format
            return [
                {
                    "date": m.date,
                    "step_count": m.step_count or 0,
                    "calories_burned": m.calories_burned or 0.0,
                    "distance_meters": m.distance_meters or 0.0,
                    "sleep_duration_minutes": m.sleep_duration_minutes or 0,
                    "deep_sleep_minutes": m.deep_sleep_minutes or 0,
                    "light_sleep_minutes": m.light_sleep_minutes or 0,
                    "rem_sleep_minutes": m.rem_sleep_minutes or 0,
                    "awake_duration_minutes": m.awake_duration_minutes or 0,
                    "avg_heart_rate": m.avg_heart_rate or 0,
                    "min_heart_rate": m.min_heart_rate or 0,
                    "max_heart_rate": m.max_heart_rate or 0,
                    "avg_spo2": m.avg_spo2 or 0.0,
                    "pai_score": 0.0,  # Calculate if needed
                    "weight": m.weight,
                    "resting_heart_rate": m.resting_heart_rate,
                    "hrv": None
                }
                for m in metrics
            ]
        finally:
            db.close()
    
    async def fetch_workouts(
        self, 
        access_token: Optional[str], 
        days: int = 30
    ) -> List[Dict[str, Any]]:
        """
        Fetch exercise sessions from Health Connect data store.
        """
        # Note: We need user_id but the interface doesn't pass it for workouts
        # This is a limitation we'll need to address in the interface
        print(f"[HealthConnect] fetch_workouts called")
        
        from backend.database import SessionLocal
        from backend.models.health_connect import HealthConnectExerciseSession
        from datetime import timedelta
        
        db = SessionLocal()
        try:
            start_date = datetime.datetime.now() - timedelta(days=days)
            
            # Query all sessions (we can't filter by user without user_id)
            # In practice, this would be called with user context
            sessions = db.query(HealthConnectExerciseSession).filter(
                HealthConnectExerciseSession.start_time >= start_date
            ).order_by(HealthConnectExerciseSession.start_time.desc()).all()
            
            return [
                {
                    "start_time": s.start_time,
                    "end_time": s.end_time,
                    "activity_type": s.exercise_type_name,
                    "activity_type_id": s.exercise_type,
                    "duration_seconds": s.duration_seconds,
                    "distance_meters": s.distance_meters or 0.0,
                    "calories": s.calories_burned or 0.0,
                    "avg_hr": s.avg_heart_rate,
                    "max_hr": s.max_heart_rate,
                    "min_hr": s.min_heart_rate
                }
                for s in sessions
            ]
        finally:
            db.close()
    
    async def fetch_sleep_sessions(
        self, 
        access_token: Optional[str], 
        days: int = 30
    ) -> List[Dict[str, Any]]:
        """
        Fetch sleep sessions from Health Connect data store.
        
        Note: Health Connect stores sleep as part of daily metrics.
        This returns an empty list as sleep is handled in fetch_daily_metrics.
        """
        print(f"[HealthConnect] fetch_sleep_sessions called")
        # Sleep data is included in daily metrics for Health Connect
        return []


# Register the provider with the factory
HealthProviderFactory.register("health_connect", HealthConnectProvider)