from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, sessionmaker
import os

DATABASE_URL = os.getenv(
    "DATABASE_URL",
    "postgresql://postgres:postgres@postgres:5432/vector_mchs"
)

engine = create_engine(DATABASE_URL, echo=False)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db():
    Base.metadata.create_all(bind=engine)