import { Buffer } from 'buffer/'

/**
 * Write a 32 bit integer to a Buffer
 *
 * @param uint32 32 bit integer to write to buffer
 * @returns a buffer with the bytes representation of uint32
 */
function bytes(uint32: number): Buffer {
  const result = Buffer.alloc(4)
  result.writeUInt32BE(uint32, 0)
  return result
}

/**
 * Maps HashPrefix names to their byte representation
 */
const HashPrefix: Record<string, Buffer> = {
  transactionID: bytes(0x54584e00),
  // transaction plus metadata
  transaction: bytes(0x534e4400),
  // account state
  accountStateEntry: bytes(0x4d4c4e00),
  // inner node in tree
  innerNode: bytes(0x4d494e00),
  // ledger master data for signing
  ledgerHeader: bytes(0x4c575200),
  // inner transaction to sign
  transactionSig: bytes(0x53545800),
  // inner transaction to sign
  transactionMultiSig: bytes(0x534d5400),
  // validation for signing
  validation: bytes(0x56414c00),
  // proposal for signing
  proposal: bytes(0x50525000),
  // payment channel claim
  paymentChannelClaim: bytes(0x434c4d00),
}

export { HashPrefix }