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concept JuiceStrategy extends G22TradingStrategy {
  settableWithVar AbstractJuicer prototypeJuicer;
  
  persistable class Position extends G22TradingStrategy.Position {
    settable AbstractJuicer juicer;
  }
  
  selfType emptyClone() {
    JuiceStrategy clone = cast super.emptyClone();
    clone.prototypeJuicer(prototypeJuicer?.configClone());
    ret clone;
  }
  
  void price(double price) {
    if (currentPrice == price) ret;
    currentPrice = price;
    afterwards { change(); }
    
    for (p : openPositions()) {
      cast p to Position;
      
      if (p.juicer != null) {
        var signals = p.juicer.calculateCloseSignals();
        var strongest = highestBy(signals, s -> s.strength());
        if (strongest != null && strongest.isTrigger()) {
          p.close(strongest);
        }
      }
    }
  }
}