import type { ClientFeatureAvailability } from "../contracts/toolOutputSchemaPrimitives.js";

/** Empty MCP client feature declaration used when the caller supplies none. */
export const NO_CLIENT_FEATURES: ClientFeatureAvailability = {
  elicitation_form: false,
  elicitation_url: false,
  roots: false,
  sampling: false,
};

/** Project a tool's client requirements against the negotiated feature set. */
export const clientRequirementsFor = (
  _name: string,
  clientFeatures: ClientFeatureAvailability,
) => {
  const requirements = { required: [], optional: [] } as const;
  return {
    required: [...requirements.required],
    optional: [...requirements.optional],
    missing_required: requirements.required.filter(
      (feature) => !clientFeatures[feature],
    ),
    missing_optional: requirements.optional.filter(
      (feature) => !clientFeatures[feature],
    ),
  };
};