from collections.abc import Generator

from sqlalchemy import text
from sqlalchemy.engine import Engine
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy import create_engine

from app.core.config import settings

engine: Engine = create_engine(
    settings.mysql_dsn,
    pool_pre_ping=True,
    pool_recycle=3600,
)
SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)


def get_db_session() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def mysql_ping() -> bool:
    with engine.connect() as conn:
        conn.execute(text("SELECT 1"))
    return True