const express = require('express'); // or Koa, etc.
const app = express();

const DotWallet = require('@dotwallet/sdk-node');
const dotwallet = new DotWallet();
// Initialize DotWallet with your client_id and secret
dotwallet.init('<YOUR_CLIENT_ID>', '<YOUR_CLIENT_SECRET>', true);
// Note: The last param of each call 'true' is for logging. It can be omitted if you don't want to see logs.

// ***** Handle user login and getting user info. *****
app.post('/auth', async (req, res) => {
  const authTokenData = await dotwallet.getUserToken(req.body.code, req.body.redirect_uri);
  const userAccessToken = authTokenData.access_token;
  const userInfo = await dotwallet.getUserInfo(userAccessToken);
  res.json({ ...userInfo, ...authTokenData });
});

// ***** Handle payment order *****
app.post('/create-order', async (req, res) => {
  const order = { ...req.body }; // must be valid order format, examine the IPaymentOrder type, or the dotwallet docs page for format schema
  const orderID = await dotwallet.getOrderID(req.body);
  res.json({ order_id: orderID });
});

// ***** Handle Automatic payment order *****
app.post('/autopay', async (req, res) => {
  // Note: if the user balance is too low, this will send an error back. Redirect the user to move funds to their autopay account, then retry the transaction.
  const orderResultData = await dotwallet.autoPay(req.body);
  res.json(orderResultData);
});

// ***** Save data to the BSV blockchain *****
app.post('/save-data', async (req, res) => {
  const saveDataResult = await dotwallet.saveData(req.body.data_to_save, req.body.userID);
  // You will receive back a txid. In a real app this txid would be stored to DB to later check the saved data on the blockchain
});