from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.config import settings

# Create async engine
engine = create_async_engine(
    settings.DATABASE_URL,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20
)

# Create a custom session class
AsyncSessionLocal = sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
    autocommit=False,
    autoflush=False
)

# Create a base class for declarative models
Base = declarative_base()