import { type IsHexErrorType, isHex } from '../data/isHex.js'
import type { ErrorType } from '../errors/utils.js'
import type { Hex } from '../types/data.js'

export type DeserializeLabelHashErrorType = IsHexErrorType | ErrorType

export function deserializeLabelHash(label: string): Hex | null {
  if (label.length !== 66) return null
  if (label.indexOf('[') !== 0) return null
  if (label.indexOf(']') !== 65) return null
  const hash = `0x${label.slice(1, 65)}`
  if (!isHex(hash)) return null
  return hash
}