"""Scoring seam (Task 3). The UI depends only on the `Scorer` protocol, never on a concrete
implementation. Swap `DummyScorer` for a real ML scorer with the same signature to go live.
"""
from .interface import Scorer, score_to_card  # noqa: F401
from .dummy import DummyScorer  # noqa: F401


def get_scorer():
    """Return the REAL ObservableScorer when the backend scoring endpoint is configured
    (OPENBMB_BASE_URL / OPENBMB_TOKEN), else the heuristic DummyScorer. Import of the backend is
    lazy so the UI keeps running standalone with no ML deps installed."""
    try:
        from .observable import ObservableScorer, backend_available
        if backend_available():
            return ObservableScorer()
    except Exception:
        pass
    return DummyScorer()