from pathlib import Path

from sqlmodel import SQLModel

from backend.app.db.session import create_app_engine


def test_sqlite_engine_waits_for_busy_database_and_uses_wal(tmp_path):
    db_path = tmp_path / "runtime.db"
    engine = create_app_engine(Path(db_path))
    SQLModel.metadata.create_all(engine)

    with engine.connect() as connection:
        busy_timeout = connection.exec_driver_sql("PRAGMA busy_timeout").scalar_one()
        journal_mode = str(connection.exec_driver_sql("PRAGMA journal_mode").scalar_one()).lower()

    assert int(busy_timeout) >= 30000
    assert journal_mode == "wal"


def test_sqlite_engine_allows_ui_request_bursts(tmp_path):
    db_path = tmp_path / "runtime.db"
    engine = create_app_engine(Path(db_path))

    assert engine.pool.size() >= 20
    assert engine.pool._max_overflow >= 20
    assert engine.pool._timeout <= 10