const { createHash } = require('crypto')
const { TransactionHandler } = require('sawtooth-sdk/processor')
const { InvalidTransaction } = require('sawtooth-sdk/processor/exceptions')
const { TransactionHeader } = require('sawtooth-sdk/protobuf')

..............

.........

class JSONHandler extends TransactionHandler {
  constructor () {
    console.log('Initializing JSON handler for Sawtooth ')
    super(FAMILY, '0.0', 'application/json', [PREFIX])
  }

  apply (txn, state) {
    //console.log('In handler.js apply function...');
    // return false;
    // Parse the transaction header and payload
    const header = TransactionHeader.decode(txn.header)
    const signer = header.signerPubkey
    const { action, asset, owner } = JSON.parse(txn.payload)

    // Call the appropriate function based on the payload's action
    console.log(`Handling transaction:  ${action} > ${asset}`,
                owner ? `> ${owner.slice(0, 8)}... ` : '',
                `:: ${signer.slice(0, 8)}...`)

    if (action === 'create') return createAsset(asset, signer, state)
    if (action === 'transfer') return transferAsset(asset, owner, signer, state)
    if (action === 'accept') return acceptTransfer(asset, signer, state)
    if (action === 'reject') return rejectTransfer(asset, signer, state)

    return Promise.resolve().then(() => {
      throw new InvalidTransaction(
        'Action must be "create", "transfer", "accept", or "reject"'
      )
    })
  }
}