"""
Database connection and session management.
"""
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from sqlalchemy.pool import StaticPool
import os

DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./test.db")

if "sqlite" in DATABASE_URL:
    engine = create_engine(
        DATABASE_URL,
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
else:
    engine = create_engine(DATABASE_URL, pool_pre_ping=True)

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


def get_db():
    """Dependency injection pour FastAPI."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()