"""
Database configuration and session management
"""

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

# Database URL - SQLite for development, easily changeable to PostgreSQL for production
DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./tcg_vault.db")

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

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

# Base class for models
Base = declarative_base()


def get_db():
    """Dependency to get database session"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db():
    """Initialize database tables"""
    from app.models import user, card, collection, deck
    Base.metadata.create_all(bind=engine)