"""Database session management."""

from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker

from app.core.config import settings

# Convert sync DATABASE_URL to async (replace postgresql:// with postgresql+asyncpg://)
async_database_url = str(settings.DATABASE_URL).replace("postgresql://", "postgresql+asyncpg://")

# Create async SQLAlchemy engine
engine = create_async_engine(
    async_database_url,
    pool_size=settings.DATABASE_POOL_SIZE,
    max_overflow=settings.DATABASE_MAX_OVERFLOW,
    pool_pre_ping=True,  # Verify connections before using
    echo=settings.DEBUG,  # Log SQL queries in debug mode
)

# Create async session factory
SessionLocal = sessionmaker(
    bind=engine,
    class_=AsyncSession,
    autocommit=False,
    autoflush=False,
    expire_on_commit=False,
)


async def get_db():
    """Dependency for getting async database session."""
    async with SessionLocal() as session:
        yield session