"""Database setup — SQLite with WAL mode, foreign keys, busy timeout."""
import os

from sqlalchemy import create_engine, event
from sqlalchemy.orm import sessionmaker

DB_DIR = os.environ.get("VELA_DB_DIR", os.path.dirname(os.path.abspath(__file__)))
DB_PATH = os.path.join(DB_DIR, "vela.db")
DATABASE_URL = f"sqlite:///{DB_PATH}"

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

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


@event.listens_for(engine, "connect")
def _set_sqlite_pragmas(dbapi_connection, connection_record):
    cursor = dbapi_connection.cursor()
    cursor.execute("PRAGMA journal_mode=WAL")
    cursor.execute("PRAGMA foreign_keys=ON")
    cursor.execute("PRAGMA busy_timeout=5000")
    cursor.close()


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