"""Database engine/session wiring.

DATABASE_URL comes from env (set by docker-compose). On the CT host it falls
back to the local postgres port mapping using POSTGRES_PASSWORD from .env.
"""
import os

from dotenv import load_dotenv
from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, sessionmaker

# /opt/polaris/.env exists on the CT host; harmless no-op elsewhere.
load_dotenv(os.getenv("POLARIS_ENV_FILE", "/opt/polaris/.env"), override=False)

DATABASE_URL = os.getenv(
    "DATABASE_URL",
    f"postgresql+psycopg2://reseller:{os.getenv('POSTGRES_PASSWORD', '')}@127.0.0.1:5432/reseller",
)

engine = create_engine(DATABASE_URL, pool_pre_ping=True, pool_size=5, max_overflow=10)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()


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