/**
 * 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  James McKenzie
 * @version 1.0 -- September 15, 2008
 */
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;
       
       tax = 0.0;

       for (int i = 0; i < categories.length; i++)
       {
	   if (categories[i] == FOOD)
	       tax += StateTaxes.foodTax(prices[i]);
       }

       return tax;       
    }


    /**
     * 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;
       
       tax = 0.0;

       for (int i = 0; i < categories.length; i++)
       {
	   if (categories[i] == NON_FOOD)
	       tax += StateTaxes.salesTax(prices[i]);
       }

       return tax;       
    }

    /**
     * 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;
       
       tax = 0.0;


       for (int i = 0; i < categories.length; i++)
       {
	   if (categories[i] == PREPARED_FOOD)
	       tax += LocalTaxes.preparedFoodTax(prices[i]);
       }

       return tax;       
    }

    /**
     * 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;
       
       total = 0.00;


       for (int i = 0; i < categories.length; i++)
       {
	   if (categories[i] == categoryToInclude)
	       total += prices[i];
       }       

       return total;       
    }
    
    
    /**
     * Determine 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;
       
       result = false;

       if (category == 0 || category == 1 || category == 2)
	   result = true;
       else
	   result = false;
       
       return result;       
    }
    
}