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

# Define the location of our SQLite database file.
# The ./. indicates it will be in the same directory as our project.
SQLALCHEMY_DATABASE_URL = "sqlite:///./multichat_overlay.db"

# Create the SQLAlchemy engine. The `connect_args` is needed only for SQLite
# to allow it to be used by multiple threads, which FastAPI does.
engine = create_engine(
    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)

# Each instance of SessionLocal will be a database session.
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# This Base will be used by our model classes to inherit from.
Base = declarative_base()