// Importing Binance and Bybit Node Packages
const {CoinMClient} = require('binance');
const RestClientV5 = require('bybit-api').RestClientV5;

// Set the API keys for the Binance and Bybit APIs
// Set the API keys for the Binance and Bybit APIs
const apiKeyBinance = 'your-binance-api-key';
const apiSecretBinance = 'your-binance-api-secret';
const apiKeyBybit = 'your-bybit-api-key';
const apiSecretBybit = 'your-bybit-api-secret';


// Create a new instance of Binance and Bybit APIs
const clientBinance = new CoinMClient({
    api_key: apiKeyBinance,
    api_secret: apiSecretBinance,
    }
);

const clientBybit = new RestClientV5({
    key: apiKeyBybit,
    secret: apiSecretBybit,
});

// Define symbol for Binance Perpetual Contracts and Bybit Spot
const perpBinanceSymbol = 'BTCUSD_PERP';
const spotBybitSymbol = 'BTCUSDT';

// Define the formula for calculating the basis
const calculateBasis = ( prepResponse , spotResponse ) => {
    // Basis = Perpetual contract price - Spot price
    const perpAsk = parseFloat(prepResponse[0].askPrice);
    const perpBid = parseFloat(prepResponse[0].bidPrice);
    const spotAsk = parseFloat(spotResponse.result.a[0][0]);
    const spotBid = parseFloat(spotResponse.result.b[0][0]);

    const perpPrice = (perpBid + perpAsk) / 2;
    const spotPrice = (spotBid + spotAsk) / 2;

    return perpPrice - spotPrice;

}

// Fetch the spot and futures prices from Binance and Bybit
const fetchSpotFuturesPrices = async () => {
    try {
        const [prepResponse, spotResponse] = await Promise.all(
            [
                clientBinance.getSymbolOrderBookTicker({symbol : perpBinanceSymbol }),// Perpertual
                clientBybit.getOrderbook({ category: 'linear', symbol: spotBybitSymbol }) // Spot
            ]
        );

        console.log(`Basis Perp-Spot Spread: ${ calculateBasis(prepResponse, spotResponse) }`);
    } catch (error) {
        console.log(error)
    }
}

setInterval(fetchSpotFuturesPrices, 2000)