/**
 * 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  Glen Newman
 * @version 1.0
 */
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;
		 
		 //initialize tax
		 tax = 0.0;
       
		 for (int i = 0; i < prices.length; i++)
		 {
		 	if (categories[i] == FOOD)
			{
				//calculate food taxes using StateTaxes.foodTax(double value)
				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;
       
		 //initialize tax
       tax = 0.0;
       
		 for (int i = 0; i < prices.length; i++)
		 {
		 	if (categories[i] == NON_FOOD)
			{
				//calculate non-food taxes using StateTaxes.salesTax(double value)
				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;
       
		 //initialize tax
       tax = 0.0;
       
		 for (int i = 0; i < prices.length; i++)
		 {
		 	if (categories[i] == PREPARED_FOOD)
			{
				//calculate prepared food taxes using LocalTaxes.preparedFoodTax(double value)
				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;
       
		 //initialize total
       total = 0.00;
		 		 
		 //add up prices in given category
		 for (int i = 0; i < prices.length; i++)
		 {
		 	if (categoryToInclude == categories[i])
			{
				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;
       		 
		 if ((category == NON_FOOD) || (category == FOOD) || (category == PREPARED_FOOD))
		 	result = true;
		 else result = false;
       
       return result;       
    }
    
}