from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.core.config import settings

# PostgreSQL 연결 URL 변환 (asyncpg 사용)
DATABASE_URL = settings.DATABASE_URL
if DATABASE_URL.startswith("postgresql://"):
    DATABASE_URL = DATABASE_URL.replace("postgresql://", "postgresql+asyncpg://")

engine = create_async_engine(
    DATABASE_URL,
    echo=settings.DEBUG,
    future=True,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
    connect_args={
        "timeout": 60,
        "command_timeout": 60,
    }
)

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

Base = declarative_base()


async def get_db():
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()