// Shared form-field schemas for numeric text inputs (single source — the
// Number-based validation deliberately rejects trailing garbage like '12abc',
// which parseFloat would silently coerce to 12).
import { z } from 'zod';

/** Required numeric text input (>= 0). */
export const numericString = z
  .string()
  .refine((v) => v.trim() !== '' && !Number.isNaN(Number(v)) && Number(v) >= 0, {
    message: 'Must be a number >= 0',
  });

/** Optional numeric text input — empty maps to null on the wire. */
export const optionalNumericString = z
  .string()
  .refine((v) => v.trim() === '' || (!Number.isNaN(Number(v)) && Number(v) >= 0), {
    message: 'Must be a number >= 0',
  });

/** Convert an optionalNumericString form value to the wire number|null. */
export function toNumberOrNull(value: string): number | null {
  return value.trim() !== '' ? Number(value) : null;
}