/**
* Note: Also make sure that your `mainnet` and `xDai`
* instances of the Etherspot SDK are available here.
*
* For the purposes of this demonstration, we're going
* to assume the following:
* 
* The mainnet Etherspot SDK:
* - const mainnetEtherspotSdk
*
* The xDai Etherspot SDK:
* - const xdaiEtherspotsdk
*/
​
import { abi } from 'erc-20-abi';

// WARNING: The following contract addresses are only for mainnet.
const daiContractAddress = "0x6b175474e89094c44da98b954eedeac495271d0f";
const tokenBridgeContractAddress = "0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016";

/**
* WARNING! The minimum amount that can be transferred 
* to the Token Bridge is 10 DAI. Please make sure you
* have enough DAI in your Etherspot address.
*/
const daiTransferAmount = ethers.utils.parseEther("10");
​
// Construct a new token interface that we can talk to...
const tokenAbiInterface = new ethers.utils.Interface(abi); 
​
// Then create a "transfer" transaction request to the
// Token Bridge...
const transactionRequest = tokenAbiInterface.encodeFunctionData("transfer", [tokenBridgeContractAddress, daiTransferAmount]);

await mainnetEtherspotSdk.clearGatewayBatch();

/**
* Step 1: Add the transaction (which instructs the DAI
* contract to perform a transfer to the Token Bridge
* contract address) to a clean "batch" of transactions.
*
* Note: You can batch many transactions together and
* submit them as one request for a more gas-efficient
* operation. Here, we're just adding 1 transaction to
* this batch.
*/
const batchResponse = await mainnetEtherspotSdk
  .batchExecuteAccountTransaction({
    to: daiContractAddress,
    data: transactionRequest
  })
  .catch(console.error);
​
/**
* Step 2: Estimate the gas required to perform this
* operation. This is useful for presenting to users
* and allowing them to make a final decision.
*/
const estimateResponse = await mainnetEtherspotSdk
  .estimateGatewayBatch()
  .catch(console.error);
​
/**
* Step 3: Finally, send this batch to Etherspot for
* processing. We'll manage the transaction, queuing,
* retries and endevour to do whatever it takes to
* get this transaction on the chosen blockchain.
*/
const submissionResponse = await mainnetEtherspotSdk
  .submitGatewayBatch()
  .catch(console.error);