import { fliphash, stringify } from 'chain'
import { isString, isArray, isObj, EMPTY_OBJ } from 'exotic'
import {
  IDENTIFIER_REFERENCE_REGISTRY,
  IDENTIFIER_STRING_REGISTRY,
} from './IDENTIFIER_REGISTRY'
import {
  uuid,
} from './uuid'

/**
 * @example for why `id` in part of a variable name sucks
 * @see https://bitbucket.org/skava-admin/skreact/commits/fbdc931637a385f99a802f9cce5ef3c7c8953632?at=dev
 */
/**
 * different than the other to identifiers -.-
 * value-equals-identity
 * one day, easy to wicked optimize this => trie
 */
function toIdentityHash(small: Object | string, ignoreReference: boolean | Object = false): string {
  // `a === b`
  if (ignoreReference === false && IDENTIFIER_STRING_REGISTRY.has(small)) {
    return IDENTIFIER_STRING_REGISTRY.get(small)
  }

  const string = stringify(small)

  if (IDENTIFIER_REFERENCE_REGISTRY.has(string)) {
    return IDENTIFIER_REFERENCE_REGISTRY.get(string)
  }

  const unique = uuid() + string
  const hashstring = '__' + fliphash(unique)
  IDENTIFIER_REFERENCE_REGISTRY.set(string, hashstring)
  IDENTIFIER_STRING_REGISTRY.set(small, hashstring)
  return hashstring
}

// no reference check
// const one = toIdentityHash({eh: 1}, true)
// const two = toIdentityHash({eh: 1}, true)
// one === two
// // // value ??
// // value
// const one = toIdentityHash({eh: 1, no: 1})
// const two = toIdentityHash({eh: 1})
// one === two
// one === 'en10'
// // reference
// const obj = {eh: 1}
// const one = toIdentityHash(obj)
// const two = toIdentityHash(obj)
// one === two

export default toIdentityHash
export { toIdentityHash }