"""MongoDB connection and initialization."""

from motor.motor_asyncio import AsyncIOMotorClient, AsyncIOMotorDatabase
from backend.core.config import settings

_client: AsyncIOMotorClient | None = None
_db: AsyncIOMotorDatabase | None = None


async def connect_db() -> None:
    """Initialize MongoDB connection."""
    global _client, _db
    _client = AsyncIOMotorClient(settings.mongodb_url)
    _db = _client[settings.mongodb_database]

    # Create indexes
    await _db.analysis_history.create_index("created_at")
    await _db.analysis_history.create_index("verdict")
    print(f"[OK] Connected to MongoDB: {settings.mongodb_database}")


async def close_db() -> None:
    """Close MongoDB connection."""
    global _client
    if _client:
        _client.close()
        print("[OK] Closed MongoDB connection")


def get_db() -> AsyncIOMotorDatabase:
    """Get database instance."""
    if _db is None:
        raise RuntimeError("Database not initialized. Call connect_db() first.")
    return _db