import { SubstateIdT } from './_types'
import { combine, Result } from 'neverthrow'
import { noTab } from './removeWhitespace'
import { BufferReaderT } from '@util'

const parseFromBufferReader = (
  bufferReader: BufferReaderT,
): Result<SubstateIdT, Error> =>
  combine([
    bufferReader.readNextBuffer(32),
    bufferReader.readNextBuffer(4),
  ]).map(resList => {
    const hash = resList[0]
    const index = resList[1].readUInt32BE(0)

    const buffer = Buffer.concat([resList[0], resList[1]])

    return {
      hash,
      index,
      toBuffer: () => buffer,
      toString: () =>
        noTab(
          `SubstateId { hash: 0x${hash.toString('hex')}, index: ${index} }`,
        ),
    }
  })

export const SubstateId = {
  parseFromBufferReader,
}