"""
Tool_OCR - Database Connection Management
SQLAlchemy setup with async support
"""

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.core.config import settings

# Create database engine
engine = create_engine(
    settings.database_url,
    pool_pre_ping=True,  # Enable connection health checks
    pool_size=10,
    max_overflow=20,
    pool_recycle=3600,  # Recycle connections every hour
    pool_timeout=30,  # Connection timeout
    connect_args={
        'connect_timeout': 10,
        'read_timeout': 30,
        'write_timeout': 30,
    },
    echo=False,  # Set to True for SQL query logging
)

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

# Base class for all models
Base = declarative_base()


# Dependency to get database session
def get_db():
    """
    Database session dependency for FastAPI endpoints

    Usage:
        @app.get("/endpoint")
        def endpoint(db: Session = Depends(get_db)):
            # Use db session here
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()