from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import os

POSTGRES_USER = os.environ.get("POSTGRES_USER", "user")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "password")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "db")
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "postgres")


SQLALCHEMY_DATABASE_URL = (
    f"postgresql://{POSTGRES_USER}:{POSTGRES_PASSWORD}@{POSTGRES_HOST}/{POSTGRES_DB}"
)

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

Base = declarative_base()