class HorizontalCalibratedThrustAssembly(QCAlgorithm):

    def Initialize(self):
        self.SetStartDate(2010, 1, 30)  # Set Start Date
        self.SetCash(100000)  # Set Strategy Cash
        self.AddEquity('SPY', Resolution.Daily) # SP500 ETF
        self.AddEquity('TLT', Resolution.Daily) # Long-Term Treasuries ETF
        self.AddEquity('VXX', Resolution.Daily) # VIX ETF
        self.AddEquity('GLD', Resolution.Daily) # Gold ETF
        
        commodities = [
                            'USO', # Oil ETF
                            'DBA', # Agriculture ETF
                            'LIT'  # Lithium ETF
                            ]
        
        self.adx = {}
        
        for ticker in commodities:
            self.AddEquity(ticker, Resolution.Daily)
            self.adx[ticker] = self.ADX(ticker, 50, Resolution.Daily)
            
        self.EnableAutomaticIndicatorWarmUp = True

    def OnData(self, data):
        if self.IsWarmingUp:
            return
        
        if not self.Portfolio.Invested:
            self.SetHoldings('SPY', .24)
            self.SetHoldings('TLT', .18)
            self.SetHoldings('VXX', .21)
            self.SetHoldings('GLD', .19)
            
        commodities2buy = []
        
        for ticker, adx in self.adx.items():
            if adx.PositiveDirectionalIndex.Current.Value > 70:
                commodities2buy.append(ticker)
            else:
                self.Liquidate(ticker)
                
        if len(commodities2buy) > 0:
            alloc = .18 / len(commodities2buy)
            
            for ticker in commodities2buy:
                self.SetHoldings(ticker, alloc)