"""
Project Jarvis — Database Configuration
Setup SQLAlchemy for Sovereign Persistence (Supabase / Postgres / SQLite)
"""
import os
import logging
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from config import settings

logger = logging.getLogger("friday.database")

# 1. Resolve Persistence Engine
# Use DATABASE_URL from settings (loaded from .env/Supabase) if available
DATABASE_URL = settings.database_url

# 2. Resolve Local Paths
DB_DIR = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "data")
DB_PATH = os.path.join(DB_DIR, "friday.db")

if DATABASE_URL:
    logger.info("Persistence: Engaging Cloud Sovereign Core (PostgreSQL).")
    # For Postgres, we don't need check_same_thread
    engine = create_engine(DATABASE_URL)
else:
    # Ensure local DB directory exists for fallback
    os.makedirs(DB_DIR, exist_ok=True)
    DATABASE_URL = f"sqlite:///{DB_PATH}"
    logger.info(f"Persistence: Local Mode Active (SQLite). Data stored at {DB_PATH}")
    engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

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

def init_db():
    global engine, SessionLocal
    try:
        # TEST CONNECTION
        from sqlalchemy import text
        with engine.connect() as conn:
            conn.execute(text("SELECT 1"))
        
        from app.models import entities
        Base.metadata.create_all(bind=engine)
        logger.info("Database Schema Initialized successfully on Cloud Grid.")
    except Exception as e:
        logger.warning(f"Persistence: Cloud grid unreachable or DNS stall detected. Error: {e}")
        logger.info(f"Persistence: Initiating SEAMLESS LOCAL FALLBACK")
        
        # Override with Local SQLite
        local_url = f"sqlite:///{DB_PATH}"
        engine = create_engine(local_url, connect_args={"check_same_thread": False})
        SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
        
        from app.models import entities
        Base.metadata.create_all(bind=engine)
        logger.info("Database Schema Initialized successfully on LOCAL SOVEREIGN CORE.")