import { isContractError } from "./client.js";

/**
 * User-facing copy overrides keyed by error code.
 */
export type ErrorMessageOverrides = Partial<Record<string, string>>;

/**
 * Map an unknown error to user-facing copy.
 *
 * Non-`ContractError` values return the fallback. Override copy per catalog
 * code with `overrides`. Client-side input validation failures return a
 * generic "check the highlighted fields" message; other contract errors
 * return the error message.
 */
export function contractErrorMessage(
  error: unknown,
  fallback: string,
  overrides: ErrorMessageOverrides = {},
): string {
  if (!isContractError(error)) {
    return fallback;
  }

  const override = error.code ? overrides[error.code] : undefined;
  if (override) {
    return override;
  }

  if (error.hasSource("client") && error.hasCode("INPUT_VALIDATION_ERROR")) {
    return "Check the highlighted fields and try again.";
  }

  return error.message;
}