abstract concept G22TradingStrategy extends ConceptWithChangeListeners {

  settable bool verbose;

  gettable S globalID = aGlobalID();

  gettable transient Q q = startQ();

  // link to market (optional)

  transient settable IFuturesMarket market;

  settableWithVar S cryptoCoin;

  settableWithVar S marginCoin = "USDT";

  settableWithVar bool usingLiveData;

  settableWithVar bool doingRealTrades;

  settableWithVar bool demoCoin;

  settableWithVar bool active;

  // moved to archive (out of main list)

  settableWithVar bool archived;

  settableWithVar double adversity = 0.2;

  settableWithVar new LS log;

  // increment of crypto we can bet on

  settableWithVar double cryptoStep = 0.0001;

  // minimum crypto we need to bet on

  settableWithVar double minCrypto = 0.0001;

  settableWithVar double maxInvestment;

  swappable long currentTime() { ret now(); }

  // Note from price feeder

  settableWithVar S feedNote;

  void log(O o) {

    if (o != null) {

      log.add(print(str(o)));

      change();

    }

  }

  LS activationStatus() {

    ret llNempties(

      active ? "Active" : "Inactive",

      empty(cryptoCoin) ? null

        : "coin: " + cryptoCoin + " over " + marginCoin

          + stringIf(demoCoin, " (demo coin)"),

      stringIf(market != null, "connected to market"),

      stringIf(usingLiveData, "using live data"),

      stringIf(doingRealTrades, "real trades")

    );

  }

  abstract Cl openPositions();

  abstract Cl closedPositions();

}