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

DATABASE_URL = os.getenv("DATABASE_URL", "postgresql+psycopg://timekeeper:timekeeper_pw@db:5432/timekeeper")

engine = create_engine(DATABASE_URL, pool_pre_ping=True, future=True)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine, future=True)

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

def ping_db():
    with engine.connect() as conn:
        conn.execute(text("SELECT 1"))