sclass BitGet {
  S domain = "https://api.bitget.com";
  S webSocketURL = "wss://ws.bitget.com/spot/v1/stream";

  Timestamp serverTime() {
    ret new Timestamp(toLong(loadJSONMapPage(domain + "/api/spot/v1/public/time").get("data")));
  }
  
  // How much we are ahead or behind of the server's time
  // (Note: includes network lag)
  Duration serverTimeDifference() {
    var serverTime = serverTime();
    ret tsNow().minusAsDuration(serverTime);
  }

  WebSocketClient printingWebSocketClient() ctex {
    ret new PrintingWebSocketClient(new URI(webSocketURL));
  }
  
  S signMessage(S message, BitGetCredentials cred) {
    ret base64(hmacSHA256(message, hexToBytes(assertNempty(cred.secretKey()))));
  }
  
  Map loginRequest(BitGetCredentials cred) {
    S timestamp = str(serverTime().unixSeconds());
    
    S messageToSign = timestamp /* + "GET" + "/user/verify"*/;
    S sign = signMessage(messageToSign, cred);
    
    ret litorderedmap(
      op := "login",
      args := ll(litorderedmap(
        apiKey := assertNempty(cred.apiKey),
        passphrase := assertNempty(cred.passphrase),
        +timestamp,
        +sign
      )));
  }
}