integration_separate.js

const bitcoin = require('bitcoinjs-lib');
const bitcoinRPC = require('bitcoin-rpc-promise'); // Replace with your preferred Bitcoin RPC library
const oracle = require('./oracle'); // Your Oracle module
const contract = require('./contract'); // Your DLC contract module

// Bitcoin Core RPC settings
const rpcConfig = {
  protocol: 'http',
  user: 'your_rpc_username',
  pass: 'your_rpc_password',
  host: 'localhost',
  port: 8332,
};

const rpc = new bitcoinRPC(rpcConfig);

async function fundDLC() {
  // Create a Bitcoin transaction to fund the DLC
  // Use bitcoinjs-lib to construct and sign the transaction
  // Handle error handling, fee calculation, UTXO selection, etc.

  const fundedTxHex = await createAndSignFundingTx();

  // Broadcast the funded transaction
  try {
    const txid = await rpc.sendrawtransaction(fundedTxHex);
    console.log(`Funded DLC transaction broadcasted. TxID: ${txid}`);
  } catch (error) {
    console.error('Error broadcasting the funded transaction:', error);
  }
}

async function createAndSignFundingTx() {
  // Implement logic to create and sign the funding transaction
  // Construct the transaction, select UTXOs, and sign it
  // Return the raw transaction hex
}

async function createDLC() {
  // Create a DLC contract with the counterparties
  // Use your DLC module to handle contract creation and negotiation
  const dlc = await contract.createDLC();

  // Fetch oracle data
  const oracleData = await oracle.fetchOracleData(dlc);

  // Create DLC transaction
  const dlcTxHex = contract.createDLCTransaction(dlc, oracleData);

  // Sign the DLC transaction
  const signedDlcTx = await signDLCTransaction(dlcTxHex);

  // Broadcast the DLC transaction
  try {
    const txid = await rpc.sendrawtransaction(signedDlcTx);
    console.log(`DLC transaction broadcasted. TxID: ${txid}`);
  } catch (error) {
    console.error('Error broadcasting the DLC transaction:', error);
  }
}

async function signDLCTransaction(txHex) {
  // Implement logic to sign the DLC transaction
  // Use bitcoinjs-lib to sign the transaction and return the signed hex
}

// Main execution
(async () => {
  try {
    await fundDLC();
    await createDLC();
  } catch (error) {
    console.error('Error:', error);
  }
})();