/**
 * Disclaimer:
 *
 * Any action you take upon the information on this page is strictly at your own
 * risk. Do your own research.
 *
 * Prerequisite:
 *
 * 1. Get a Binance account
 *
 * You may use the referal link below so both of us get 10% commission fee
 *
 * @link https://www.binance.com/en/register?ref=I6Z9DEQD
 *
 * 2. Store your Binance api key and secret key in a `.env` file
 *
 * @link https://www.binance.com/en/support/faq/360002502072-How-to-create-API
 *
 * 3. Buy some stablecoins (e.g. USDT) for making orders
 *
 * @link https://www.binance.com/en/buy-TetherUS
 *
 */

require("dotenv").config();

const cron = require("node-cron");
const axios = require("axios");
const qs = require("qs");
const crypto = require("crypto");

/**
 * Sign the payload with your Binance secret key
 *
 * @link https://github.com/binance/binance-spot-api-docs/blob/master/rest-api.md#signed-trade-and-user_data-endpoint-security
 */
function signPayload(payload) {
  const data = { ...payload, timestamp: Date.now() };
  const signature = crypto
    .createHmac("sha256", process.env.BINANCE_SECRET_KEY)
    .update(qs.stringify(data))
    .digest("hex");
  return { ...data, signature };
}

/**
 * Send in a new order.
 *
 * @link https://github.com/binance/binance-spot-api-docs/blob/master/rest-api.md#new-order--trade
 */
function order(params) {
  return axios({
    method: "POST",
    // url: `https://api.binance.com/api/v3/order/test`,
    url: `https://api.binance.com/api/v3/order`,
    params: signPayload(params),
    headers: { "X-MBX-APIKEY": process.env.BINANCE_API_KEY },
  });
}

/**
 * Order as many Bitcoin as 10 USDT can.
 */
async function orderBitcoin() {
  try {
    const { data } = await order({
      symbol: "BTCUSDT",
      side: "BUY",
      type: "MARKET",
      quoteOrderQty: 10,
    });
    // if test endpoint is used, the response will be an empty object
    if (data.fills) {
      const { price, commission, qty } = data.fills[0];
      console.log(
        `Ordered ${qty}BTC at price ${price}, commission ${commission}.`,
      );
    } else {
      console.log("Successfully create a test order.");
    }
  } catch (error) {
    console.log(error.response?.data || error.message);
  }
}

/**
 * Schedule to run the orderBitcoin function everyday at 00:00, America/New_York.
 */
cron.schedule("0 0 * * *", orderBitcoin, {
  timezone: "America/New_York",
});

/**
 * That's it. Now you may deploy on the `application` on DigitalOcean/Heroku to
 * keep it running and manage the process with PM2.
 *
 * @link https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-20-04
 *
 * Explore what you can do with other Binance APIs and have fun.
 *
 * -- THE END --
 */