"""
Database functionality for the agent monitoring system.
This package provides database access and utilities for agent monitoring.
"""

import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, scoped_session

# Import DB_URI from central config (handles HF Spaces vs local dev)
from utils.config import DB_URI

DATABASE_URL = DB_URI

# Create engine
engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})

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

# Create a scoped session for thread safety
Session = scoped_session(SessionLocal)

# Base class for models
Base = declarative_base()

# Function to get database session
def get_db():
    db = Session()
    try:
        yield db
    finally:
        db.close()

# Import models and utility functions
from backend.database.models import KnowledgeGraph, Entity, Relation, Base
from backend.database.utils import (
    save_knowledge_graph, 
    update_knowledge_graph_status,
    get_knowledge_graph,
    get_all_knowledge_graphs,
    delete_knowledge_graph
)

# Function to initialize database
def init_db():
    """Initialize the database by creating all tables."""
    Base.metadata.create_all(bind=engine)

__all__ = [
    'get_db',
    'models',
    'init_db',
    'save_knowledge_graph',
    'update_knowledge_graph_status',
    'get_knowledge_graph',
    'get_all_knowledge_graphs',
    'delete_knowledge_graph',
    'KnowledgeGraph',
    'Entity',
    'Relation'
]