"""
=========================================
CV6 AI Trading OS
Database Session
=========================================
"""

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from app.core.settings import settings

# Database Engine
# H-6 FIX: check_same_thread=False required for SQLite under async FastAPI
_connect_args = {"check_same_thread": False} if settings.DATABASE_URL.startswith("sqlite") else {}
engine = create_engine(
    settings.DATABASE_URL,
    echo=settings.DEBUG,
    connect_args=_connect_args,
)

# Session Factory
SessionLocal = sessionmaker(
    autocommit=False,
    autoflush=False,
    bind=engine,
)
# --------------------------------------------------------
# Database Dependency
# --------------------------------------------------------

def get_db():
    """
    Database Session Dependency
    """

    db = SessionLocal()

    try:
        yield db

    finally:
        db.close()