import isCidr from "is-cidr";
import type { LenConstraint } from "../api/ServerApi";

/**
 * Check if a constraint was respected or not
 *
 * @returns An error message appropriate for the constraint
 * violation, if any, or undefined otherwise
 */
export function checkConstraint(
  constraint: LenConstraint,
  value: string | undefined
): string | undefined {
  value = value ?? "";
  if (value.length < constraint.min)
    return `Please specify at least ${constraint.min} characters!`;

  if (value.length > constraint.max)
    return `Please specify at least ${constraint.min} characters!`;

  return undefined;
}

/**
 * Check if a number constraint was respected or not
 *
 * @returns An error message appropriate for the constraint
 * violation, if any, or undefined otherwise
 */
export function checkNumberConstraint(
  constraint: LenConstraint,
  value: number
): string | undefined {
  value = value ?? "";
  if (value < constraint.min)
    return `Value is below accepted minimum (${constraint.min})!`;

  if (value > constraint.max)
    return `Value is above accepted maximum (${constraint.min})!`;

  return undefined;
}

/**
 * Check whether a given IP network address is valid or not
 *
 * @param ip The IP network to check
 * @returns true if the address is valid, false otherwise
 */
export function isIPNetworkValid(ip: string): boolean {
  return isCidr(ip) !== 0;
}