/**
 * Input sanitization utilities - pure functions for cleaning user input.
 */

import { MAX_IDENTIFIER_LENGTH, MAX_STRING_LENGTH } from './constants.js'

const IDENTIFIER_REGEX = /^\w+$/

export function sanitizeString(str, maxLength = MAX_STRING_LENGTH) {
  if (typeof str !== 'string') return ''
  const trimmed = str.trim()
  return trimmed.length > maxLength ? trimmed.slice(0, maxLength) : trimmed
}

export function sanitizeIdentifier(str) {
  if (typeof str !== 'string') return ''
  const trimmed = str.trim()
  if (trimmed.length === 0 || trimmed.length > MAX_IDENTIFIER_LENGTH) return ''
  return IDENTIFIER_REGEX.test(trimmed) ? trimmed : ''
}

export function sanitizeLabel(str, maxLength = MAX_STRING_LENGTH) {
  return sanitizeString(str, maxLength)
}