import os
from pathlib import Path
from typing import Annotated

from fastapi import Depends
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import Session, sessionmaker

Base = declarative_base()

# Database configuration
# Use the preprocessor's database for consistency
# Get absolute path to the preprocessor database
APP_DIR = Path(__file__).parent.parent
PREPROCESSOR_DB = APP_DIR.parent / "preprocessor" / "version_two.db"
DATABASE_URL = os.getenv("DATABASE_URL", f"sqlite:///{PREPROCESSOR_DB}")

# Create engine
engine = create_engine(DATABASE_URL, echo=False)

# Create session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


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


db_dependency = Annotated[Session, Depends(get_db)]


def init_database():
    """Initialize the database by creating all tables"""
    Base.metadata.create_all(bind=engine)


def get_session_sync() -> Session:
    """Get a database session for synchronous operations"""
    return SessionLocal()


def get_db_session():
    """Get a database session for direct use."""
    return SessionLocal()