import os, tempfile

def _fresh_db(monkeypatch):
    tmp = tempfile.mkdtemp()
    path = os.path.join(tmp, "lotto.db")
    from app import db
    monkeypatch.setattr(db, "DB_PATH", path)
    db.init_db()
    return db

def test_backtest_tables_exist(monkeypatch):
    db = _fresh_db(monkeypatch)
    with db._conn() as conn:
        tables = {r["name"] for r in conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table'").fetchall()}
    assert "backtest_runs" in tables
    assert "winner_calibration" in tables

def test_backtest_runs_unique(monkeypatch):
    db = _fresh_db(monkeypatch)
    db.save_backtest_run(draw_no=100, strategy="random_null", weight_label="-",
                         weight_json=None, trial_id=None, n_tickets=10,
                         hist={"m3":1,"m4":0,"m5":0,"m6":0,"bonus_hits":0},
                         best_match=3, avg_meta_score=0.5)
    db.save_backtest_run(draw_no=100, strategy="random_null", weight_label="-",
                         weight_json=None, trial_id=None, n_tickets=10,
                         hist={"m3":2,"m4":0,"m5":0,"m6":0,"bonus_hits":0},
                         best_match=3, avg_meta_score=0.6)  # 멱등 upsert
    rows = db.get_backtest_runs(draw_no=100)
    assert len(rows) == 1
    assert rows[0]["m3"] == 2  # 마지막 값으로 갱신