# database/connection.py
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker
from dotenv import load_dotenv
import os

load_dotenv()

# Grab database URL from environment variables for security
DATABASE_URL = os.getenv("DATABASE_URL")
if not DATABASE_URL:
    raise ValueError("DATABASE_URL environment variable is missing!")  
# Create the global async engine
engine = create_async_engine(
    DATABASE_URL, 
    echo=True, 
    connect_args={"ssl": "require"}
)

# Create a session factory
AsyncSessionLocal = sessionmaker(
    bind=engine, 
    class_=AsyncSession, 
    expire_on_commit=False
)

# Dependency wrapper (commonly used in FastAPI or async apps)
async def get_session() -> AsyncSession:
    async with AsyncSessionLocal() as session:
        yield session