/**
 * @module index
 */
import { base58Encode, blake2b, concat, signBytes, address } from '@acryl/ts-lib-crypto'
import { serializePrimitives } from '@acryl/marshall'
const {STRING} = serializePrimitives
import { getSenderPublicKey, convertToPairs } from '../generic'
import { IAuthParams, IAuth } from '../transactions'
import { validate } from '../validators'
import { LEN, SHORT } from '@acryl/marshall/dist/serializePrimitives';

export const serializeAuthData = (auth: {host: string, data: string}) => concat(
    LEN(SHORT)(STRING)('WavesWalletAuthentication'),
    LEN(SHORT)(STRING)(auth.host || ''),
    LEN(SHORT)(STRING)(auth.data || ''),
)

export function auth(params: IAuthParams, seed?: string, chainId?: string|number): IAuth {
  
  const seedsAndIndexes = convertToPairs(seed)
  const publicKey = params.publicKey || getSenderPublicKey(seedsAndIndexes, {senderPublicKey: undefined})
  
  validate.auth(params)
  
  const rx = {
    hash: '',
    signature: '',
    host: params.host,
    data: params.data,
    publicKey,
    address: address({ publicKey }, chainId)
  }
  
  const bytes = serializeAuthData(rx)
  
  rx.signature = ( seed != null && signBytes(seed, bytes)) || ''
  rx.hash =  base58Encode(blake2b(Uint8Array.from(bytes)))

  return rx
}