package Strategy.Holding;

public class PriceChangerLambdas {
    
    // using lambda expressions with the PriceChanger interface
    // can use lambdas with any interface that requires only one method
    public static void main(String[] args) {
        // use lambda expression to create one price changer
        // variation(double x) returns x * .3
        PriceChanger p = x -> x * .3;
        // use that pricechanger's variation method
        System.out.println(p.variation(9));

        
        
        // whole array of price changers created with lambda expressions
        PriceChanger options[] = {
            p,
            x -> Math.random() -.5,
            x -> Math.random() * x - (x/2),
            x -> Math.random() * (x/2) -(x-4),
            x -> Math.random() * (x/10),
            x -> Math.random() * 1.25 -.5
        };


        
        // result of each pricechanger in the array on a value
        for (PriceChanger pc : options) {
            double value = 100; 
            value += pc.variation(value); 
            System.out.println(value);            
        }
        
        
        // use a random priceChanger from the array
        double value = 100; 
        value += options[(int)(Math.random() * options.length)].variation(value); 
        
        // if we had our Holding class with a nice parameterized constructor
        // make one with a random PriceChanger
        Holding h = new Holding(10, 100, .01, false, options[(int)(Math.random() * options.length)]);
        
    }
    
}