import assert from 'assert'
import { CID } from 'multiformats/cid'
import * as json from 'multiformats/codecs/json'
import { sha256 } from 'multiformats/hashes/sha2'
import { base64 } from 'multiformats/bases/base64'

async function run () {
  // ** PART 1: CREATING A NEW CID **

  // Arbitrary input value
  const value = { hello: 'world' }

  // Encoded Uint8array representation of `value` using the plain JSON IPLD codec
  const bytes = json.encode(value)

  // Hash Uint8array representation
  const hash = await sha256.digest(bytes)

  // Create CID (default base32)
  const cid = CID.create(1, json.code, hash)

  // cid.code --> 512 (0x0200) JSON IPLD codec)
  // cid.version --> 1
  // cid.multihash --> digest, including code (18 for sha2-256), digest size (32 bytes)
  // cid.bytes --> byte representation`

  console.log('Example CID: ' + cid.toString())
  // 'bagaaierasords4njcts6vs7qvdjfcvgnume4hqohf65zsfguprqphs3icwea'

  // ** PART 2: MULTIBASE ENCODERS / DECODERS / CODECS **

  // Encode CID from part 1 to base64, decode back to base32
  const cidBase64 = cid.toString(base64.encoder)
  console.log('base64 encoded CID: ' + cidBase64)
  // 'mAYAEEiCTojlxqRTl6svwqNJRVM2jCcPBxy+7mRTUfGDzy2gViA'

  const cidBase32 = CID.parse(cidBase64, base64.decoder)
  // 'bagaaierasords4njcts6vs7qvdjfcvgnume4hqohf65zsfguprqphs3icwea'

  // test decoded CID against original
  assert.strictEqual(cidBase32.toString(), cid.toString(), 'Warning: decoded base32 CID does not match original')
  console.log('Decoded CID equal to original base32: ' + cidBase32.equals(cid)) // alternatively, use more robust built-in function to test equivalence

  // Multibase codec exposes both encoder and decoder properties
  cid.toString(base64)
  CID.parse(cid.toString(base64), base64)

  // ** PART 3: CID BASE CONFIGURATIONS **

  // CID v1 default encoding is base32
  const v1 = CID.parse('bagaaierasords4njcts6vs7qvdjfcvgnume4hqohf65zsfguprqphs3icwea')
  v1.toString()
  // 'bagaaierasords4njcts6vs7qvdjfcvgnume4hqohf65zsfguprqphs3icwea'

  // CID v0 default encoding is base58btc
  const v0 = CID.parse('QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n')
  v0.toString()
  // 'QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n'
  v0.toV1().toString()
  // 'bafybeihdwdcefgh4dqkjv67uzcmw7ojee6xedzdetojuzjevtenxquvyku'
}

run().catch((err) => {
  console.error(err)
  process.exit(1)
})