import {Signature} from 'eosjs/dist/Signature'
import {createHash} from 'crypto'

function sha256(buffer: Buffer) {
    let hash = createHash('sha256')
    hash.update(buffer)
    return hash.digest()
}

// real txn on chain, eos mainnet blk 123,803,753
let expectedId = '801048dfa7c17bf53dd80fca4c194901dadcba7399da8e5a7c66e71e9f57a13b'
let expectedPub = 'PUB_R1_5ie6pYwskXQY7VqbsRovPnfJweqPaaT97zdgYrAxuXUBdqadM6'
let packedTrx = '3165d55e13179b502978000000000100a6823403ea3055000000572d3ccdcd01104d76cca58c653400000000a8ed323225104d76cca58c653480b1915e5d268dca010000000000000004454f530000000004f09f8ea000'
let sigStr = 'SIG_R1_KHdJK7c5yuC7ouDywJ2U9Jm47RxY81P6PzF9U7N6iaQeeZY6mVUxR6sQTHTG4zaw4wvUCMxNdvNvQRj8TqtxyqYwEhQecm'

let txId = sha256(Buffer.from(packedTrx, 'hex')).toString('hex')

console.log('expected tx id', expectedId)
console.log('  actual tx id', txId)

let messageHex = 'aca376f206b8fc25a6ed44dbdc66547c36c6c33e3a119ffbeaef943642f0e906' + packedTrx + '0000000000000000000000000000000000000000000000000000000000000000'

let sig = Signature.fromString(sigStr)
let pub = sig.recover(messageHex, true, 'hex').toString()

console.log('expected pub', expectedPub)
console.log('  actual pub', pub)