"""Database session and initialization."""

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


class Base(DeclarativeBase):
    pass


engine = None
async_session_maker = None


async def init_db():
    global engine, async_session_maker
    settings = get_settings()
    engine = create_async_engine(
        settings.database_url,
        echo=settings.debug,
    )
    async_session_maker = async_sessionmaker(
        engine, class_=AsyncSession, expire_on_commit=False
    )
    from app.models import Case, Screenshot, Transaction  # noqa: F401
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def get_db():
    async with async_session_maker() as session:
        yield session