import type { Future } from "../../../types/module.js";
import type { ReconciliationFutureResultFailure } from "../types.js";

import { fail } from "../utils.js";

export function compare<
  ValueT extends bigint | number | boolean | string | undefined,
>(
  future: Future,
  fieldName: string,
  existingValue: ValueT,
  newValue: ValueT,
  messageSuffix?: string,
): ReconciliationFutureResultFailure | undefined {
  if (existingValue !== newValue) {
    return fail(
      future,
      `${fieldName} has been changed from ${
        existingValue?.toString() ?? '"undefined"'
      } to ${newValue?.toString() ?? '"undefined"'}${messageSuffix ?? ""}`,
    );
  }
}