"""
Database connection for Token Service
"""

from motor.motor_asyncio import AsyncIOMotorClient, AsyncIOMotorDatabase
import logging
import os

logger = logging.getLogger(__name__)

# Database configuration
MONGO_URL = os.getenv("MONGO_URL", "mongodb://localhost:27017")
DATABASE_NAME = os.getenv("DATABASE_NAME", "energy_dashboard_tokens")

# Global database client
_client: AsyncIOMotorClient = None
_database: AsyncIOMotorDatabase = None

async def connect_to_mongo():
    """Create database connection"""
    global _client, _database
    
    try:
        _client = AsyncIOMotorClient(MONGO_URL)
        _database = _client[DATABASE_NAME]
        
        # Test connection
        await _database.command("ping")
        logger.info(f"Connected to MongoDB: {DATABASE_NAME}")
        
        # Create indexes for performance
        await create_indexes()
        
    except Exception as e:
        logger.error(f"Failed to connect to MongoDB: {e}")
        raise

async def close_mongo_connection():
    """Close database connection"""
    global _client
    
    if _client:
        _client.close()
        logger.info("Disconnected from MongoDB")

async def get_database() -> AsyncIOMotorDatabase:
    """Get database instance"""
    global _database
    
    if _database is None:
        raise RuntimeError("Database not initialized. Call connect_to_mongo() first.")
    
    return _database

async def create_indexes():
    """Create database indexes for performance"""
    db = await get_database()
    
    # Indexes for tokens collection
    await db.tokens.create_index("token", unique=True)
    await db.tokens.create_index("active")
    await db.tokens.create_index("expires_at")
    await db.tokens.create_index("name")
    
    logger.info("Database indexes created")