package pr01;

public class GroceryProduct {

   private String name;
   private double pricePerPound;
   private double discountRate;
   private double startingDiscountWeight;

   public GroceryProduct(String name, double pricePerPound,
         double discountRate, double startingDiscountWeight) {
      this.name = name;
      this.pricePerPound = pricePerPound;
      this.discountRate = discountRate;
      this.startingDiscountWeight = startingDiscountWeight;
   }

   public String getName() {
      return name;
   }

   public double getPricePerPound() {
      return pricePerPound;
   }

   public double getDiscountRate() {
      return discountRate;
   }

   public double getStartingDiscountWeight() {
      return startingDiscountWeight;
   }

   public double getNewSellingPrice(double weight) {
      double price;
      double discount = 0;
      double nextDiscount = discountRate;
      double discountWeight = startingDiscountWeight;
      while (weight >= discountWeight) {
         discount += nextDiscount;
         nextDiscount = nextDiscount / 2;
         discountWeight *= 2;
      }
      price = pricePerPound * weight;
      price = price - discount * price;
      return price;
   }

   public double getSellingPrice(double weight) {
      double price = pricePerPound * weight;
      if (weight >= startingDiscountWeight)
         price = price - discountRate * price;
      return price;
   }

   public String toString() {
      return name + ", price per pound: $" + pricePerPound + ", discount: "
            + discountRate + " starting at " + startingDiscountWeight
            + " pounds";
   }

}