"""Database configuration and session management."""

from collections.abc import AsyncGenerator

from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase

from app.config import get_settings

settings = get_settings()

# Convert postgresql:// to postgresql+asyncpg:// for async
database_url = settings.database_url
if database_url.startswith("postgresql://"):
    database_url = database_url.replace("postgresql://", "postgresql+asyncpg://", 1)

engine = create_async_engine(
    database_url,
    echo=settings.debug,
    pool_pre_ping=True,
)

AsyncSessionLocal = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


class Base(DeclarativeBase):
    """Base class for SQLAlchemy models."""

    pass


async def get_db() -> AsyncGenerator[AsyncSession, None]:
    """Dependency for getting database session."""
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()