"""Phase 12 site 4: _list_anthropic_models Result migration.

Site 4 (L1337):
  try: anthropic = _require_warmed('anthropic'); ... client.models.list() ...
  except Exception as exc:
      raise _classify_anthropic_error(exc) from exc

BUG: _classify_anthropic_error(exc) returns ErrorInfo (not an Exception).
'raise ErrorInfo from exc' would fail at runtime. Migrate to Result.
"""
import sys
sys.path.insert(0, ".")


def test_phase12_site4_list_anthropic_models_result_exists():
    import src.ai_client
    assert hasattr(src.ai_client, "_list_anthropic_models_result"), \
        "_list_anthropic_models_result helper missing"


def test_phase12_site4_helper_returns_result():
    import src.ai_client
    import inspect
    fn = src.ai_client._list_anthropic_models_result
    sig = inspect.signature(fn)
    assert "Result" in str(sig.return_annotation), \
        f"_list_anthropic_models_result return must be Result, got {sig.return_annotation}"


def test_phase12_site4_legacy_no_broken_raise():
    """Legacy _list_anthropic_models must NOT raise _classify_anthropic_error result (the ErrorInfo-as-Exception bug)."""
    import inspect
    import src.ai_client
    src_text = inspect.getsource(src.ai_client._list_anthropic_models)
    assert "raise _classify_anthropic_error" not in src_text, \
        "_list_anthropic_models legacy must NOT raise ErrorInfo as Exception"


def test_phase12_site4_legacy_preserved():
    import src.ai_client
    assert callable(getattr(src.ai_client, "_list_anthropic_models", None))