/**
 * 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  Erik Fleming
 * @version 1.0 September 14, 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 = StateTaxes.foodTax(total(prices, categories, FOOD));

       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, sum;
   	    
       tax = StateTaxes.salesTax(total(prices, categories, NON_FOOD));
       
       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;
       
       tax = LocalTaxes.preparedFoodTax(total(prices, categories, PREPARED_FOOD));

       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;
		 
		 total = 0;
       
		 if (categoryToInclude == NON_FOOD)
		 {
		 	for (int i = 0; i < prices.length; i++)
			{
				if (categories[i] == NON_FOOD)
				{
					total += prices[i];
				}// end if
			}// end for
		 }// end if
		 
		 else if (categoryToInclude == FOOD)
		 {
		 	for (int i = 0; i < prices.length; i++)
			{
				if (categories[i] == FOOD)
				{
					total += prices[i];
				}// end if
			}// end for
		 }// end else if
		 
		 else
		 {
		 	for (int i = 0; i < prices.length; i++)
			{
				if (categories[i] == PREPARED_FOOD)
				{
					total += prices[i];
				}// end if
			}// end for
		 }// end else
       
       

       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 class