import { 
  MPTokenIssuanceCreateFlags,
  Client,
  encodeMPTokenMetadata,
  decodeMPTokenMetadata
} from 'xrpl'

// Connect to network and get a wallet
const client = new Client('wss://s.devnet.rippletest.net:51233')
await client.connect()

console.log('=== Funding new wallet from faucet...===')
const { wallet: issuer } = await client.fundWallet()
console.log(`Issuer address: ${issuer.address}`)

// Define metadata as JSON
const mpt_metadata = {
  ticker: 'TBILL',
  name: 'T-Bill Yield Token',
  desc: 'A yield-bearing stablecoin backed by short-term U.S. Treasuries and money market instruments.',
  icon: 'https://example.org/tbill-icon.png',
  asset_class: 'rwa',
  asset_subclass: 'treasury',
  issuer_name: 'Example Yield Co.',
  uris: [
    {
      uri: 'https://exampleyield.co/tbill',
      category: 'website',
      title: 'Product Page'
    },
    {
      uri: 'https://exampleyield.co/docs',
      category: 'docs',
      title: 'Yield Token Docs'
    }
  ],
  additional_info: {
    interest_rate: '5.00%',
    interest_type: 'variable',
    yield_source: 'U.S. Treasury Bills',
    maturity_date: '2045-06-30',
    cusip: '912796RX0'
  }
}

// Encode the metadata.
// The encodeMPTokenMetadata function converts the JSON metadata object into
// a compact, hex-encoded string, following the XLS-89 standard.
// https://xls.xrpl.org/xls/XLS-0089-multi-purpose-token-metadata-schema.html
console.log('\n=== Encoding metadata...===')
const mpt_metadata_hex = encodeMPTokenMetadata(mpt_metadata)
console.log("Encoded mpt_metadata_hex:", mpt_metadata_hex)

// Define the transaction, including other MPT parameters
const mpt_issuance_create = {
  TransactionType: 'MPTokenIssuanceCreate',
  Account: wallet.address,
  AssetScale: 4,
  MaximumAmount: '50000000',
  TransferFee: 0,
  Flags: MPTokenIssuanceCreateFlags.tfMPTCanTransfer |
            MPTokenIssuanceCreateFlags.tfMPTCanTrade,
  MPTokenMetadata: mpt_metadata_hex
}

// Prepare, sign, and submit the transaction
console.log('\n=== Sending MPTokenIssuanceCreate transaction...===')
const submit_response = await client.submitAndWait(mpt_issuance_create, 
  { wallet, autofill: true }
)

// Check transaction results
console.log('\n=== Checking MPTokenIssuanceCreate results...===')
// console.log(JSON.stringify(submit_response, null, 2))
if (submit_response.result.meta.TransactionResult !== 'tesSUCCESS') {
  const result_code = submit_response.result.meta.TransactionResult
  console.warn(`Transaction failed with result code ${result_code}.`)
  await client.disconnect()
  process.exit(1)
}

const issuance_id = submit_response.result.meta.mpt_issuance_id
console.log(`- MPToken created successfully with issuance ID: ${issuance_id}`)
// View the MPT issuance on the XRPL Explorer
console.log(`\n- Explorer URL: https://devnet.xrpl.org/mpt/${issuance_id}`)

// Look up MPT Issuance entry in the validated ledger
console.log('\n=== Confirming MPT Issuance metadata in the validated ledger... ===')
const ledger_entry_response = await client.request({
  "command": "ledger_entry",
  "mpt_issuance": issuance_id,
  "ledger_index": "validated"
})

// Decode the metadata.
// The decodeMPTokenMetadata function takes a hex-encoded string representing MPT metadata, 
// decodes it to a JSON object, and expands any compact field names to their full forms. 
const metadata_blob = ledger_entry_response.result.node.MPTokenMetadata
const decoded_metadata = decodeMPTokenMetadata(metadata_blob) 
console.log('Decoded MPT metadata: ', decoded_metadata)

// Disconnect from the client
client.disconnect()