import type { CheckFailure } from "../types";

export function truncateActual(value: unknown, maxLen = 200): unknown {
  if (value === undefined || value === null) return value;
  const str = String(value);
  if (str.length <= maxLen) return value;
  return str.slice(0, maxLen) + "...";
}

export function mismatchFailure(
  phase: CheckFailure["phase"],
  path: string,
  expected: unknown,
  actual: unknown,
  message: string,
): CheckFailure {
  return {
    kind: "mismatch",
    phase,
    path,
    expected,
    actual: truncateActual(actual),
    message,
  };
}

export function errorFailure(phase: CheckFailure["phase"], path: string, message: string): CheckFailure {
  return {
    kind: "error",
    phase,
    path,
    message,
  };
}