from sqlalchemy import create_engine, event
from sqlalchemy.orm import sessionmaker, declarative_base
from sqlalchemy.pool import StaticPool

from app.config import get_settings

settings = get_settings()

# SQLite-specific configuration
connect_args = {"check_same_thread": False}

engine = create_engine(
    settings.database_url,
    connect_args=connect_args,
    poolclass=StaticPool,
    echo=False,
)

# Enable WAL mode for better concurrent access
@event.listens_for(engine, "connect")
def set_sqlite_pragma(dbapi_connection, connection_record):
    cursor = dbapi_connection.cursor()
    cursor.execute("PRAGMA journal_mode=WAL")
    cursor.execute("PRAGMA synchronous=NORMAL")
    cursor.execute("PRAGMA foreign_keys=ON")
    cursor.close()

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():
    """Create all tables."""
    from app.models import species, image, job, api_key, export, cached_stats  # noqa
    Base.metadata.create_all(bind=engine)