// Requires: bun add bitcoinjs-lib @bitcoinerlab/secp256k1 ecpair
// Run from a checkout of this repo so the local bitcoin-script package resolves,
// or `bun add file:./bitcoin-script` from elsewhere in this monorepo.
import * as bitcoin from 'bitcoinjs-lib';
import {
  buildEmergencyTransaction,
  finalizePathB,
  keyPairFromPrivkey,
} from '@writz/bitcoin-script';

const network = bitcoin.networks.testnet; // or bitcoin.networks.bitcoin for mainnet

const userKey = keyPairFromPrivkey(
  Buffer.from('<your 32-byte private key, hex>', 'hex'),
  network,
);

const spendParams = {
  txidHex: '<funding txid, display order>',
  vout: 0,
  amountSat: 89_631,
  scriptPubKey: Buffer.from('<34-byte P2WSH scriptPubKey, hex>', 'hex'),
  redeemScript: Buffer.from('<redeem script, hex>', 'hex'),
  recipientAddress: '<your own BTC address to receive the funds>',
  feeSat: 1_500, // estimate via your node's fee-rate API and the ~149 vbyte tx size
  network,
};

const timelockHeight = 700_000; // your deposit's CLTV height

const psbt = buildEmergencyTransaction(spendParams, timelockHeight);
psbt.signInput(0, userKey.signer);
finalizePathB(psbt, 0, userKey.publicKey);

const tx = psbt.extractTransaction();
console.log('Broadcast this raw tx hex:', tx.toHex());