"""
Database connection management
"""
from pymongo import MongoClient
from pymongo.database import Database
from app.config import Config

_config = Config()
_client: MongoClient = None
_db: Database = None

def get_database() -> Database:
    """
    Get MongoDB database instance
    
    Returns:
        MongoDB database instance
    """
    global _db, _client
    
    if _db is None:
        _client = MongoClient(
            _config.mongodb_uri,
            maxPoolSize=_config.mongodb_max_pool_size,
            minPoolSize=_config.mongodb_min_pool_size
        )
        _db = _client[_config.mongodb_database]
    
    return _db

def close_database():
    """Close database connection"""
    global _client, _db
    if _client:
        _client.close()
        _client = None
        _db = None