/**
 * A utility class that can be used to calculate sales
 * taxes on a collection of items
 *
 *
 * This work complies with the JMU Honor Code.
 *
 * @author  Kurt Dowswell
 * @version 9/16/08
 */
    public class TaxCalculator
   {
      public static int NON_FOOD        = 0;
      public static int FOOD            = 1;
      public static int PREPARED_FOOD   = 2;
    
   
    /**
     * Calculate the tax on the (non-prepared) food items
     *
     * @param prices      The prices of all items purchases
     * @param categories  The corresponding categories of all items purchases
     * @return            The tax
     */
       public static double foodTax(double[] prices, int[] categories)
      {
         double tax;
         double price;
       
         //get total price of category items
         price = total(prices, categories, FOOD);
			//calculate tax for category items
         tax = StateTaxes.foodTax(price);
      
         return tax;       
      }//end foodTax
   
   
    /**
     * Calculate the tax on the non-food items
     *
     * @param prices      The prices of all items purchases
     * @param categories  The corresponding categories of all items purchases
     * @return            The tax
     */
       public static double nonfoodTax(double[] prices, int[] categories)
      {
         double tax;
         double price;
       
      	//get total price of category items
         price = total(prices, categories, NON_FOOD);
			//calculate tax for category items
         tax = StateTaxes.salesTax(price);
      
         return tax;       
      }//end nonfoodTax
    
   
   
    /**
     * Calculate the tax on the prepared food items
     *
     * @param prices      The prices of all items purchases
     * @param categories  The corresponding categories of all items purchases
     * @return            The tax
     */
       public static double preparedfoodTax(double[] prices, int[] categories)
      {
         double tax;
         double price;
      
      	//get total price of category items
         price = total(prices, categories, PREPARED_FOOD);
			//calculate tax for category items
         tax = LocalTaxes.preparedFoodTax(price);
      
         return tax;       
      }//end preparedfoodTax
   
   
   
    /**
     * Calculate the total value of all items purchased in
     * particular category
     *
     * @param prices      The prices of all items purchases
     * @param categories  The corresponding categories of all items purchases
     * @param categoryToInclude  The category of interest
     * @return            The total value of items in the given category
     */
       public static double total(double[] prices, int[] categories, 
                                int categoryToInclude)
      {
         double     total = 0;
         
         //total the price of each item in the category
         for (int i = 0; i < categories.length; i++)
         {
            if (categories[i] == categoryToInclude)
            {
               total += prices[i];
            }
         }//end for
      	
         return total;       
      }//end total
    
    
    /**
     * Determin if the given category is valid
     *
     * @param category   The category of interest
     * @return           true if the category is valid; false otherwise
     */
       public static boolean isValid(int category)
      {
         boolean     result;
       
         if (category >= 0 && category <= 2)
            result = true;
         else
            result = false;
      	
         return result;       
      }//end isValid
    
   }//end TaxCalculator