import javax.swing.JOptionPane;

public class retail {
   public static void main (String[] args){

   //compute the discount on retail sales depending on the day

   //declares all variables
   double discount = 0;
   double discount_amount = 0;
   double retail_price = 0;
   double total_retail_price =0;
   double retail_price_after_discount = 0;
   double total_retail_price_after_discount = 0;
   double total_discount = 0;
   int total_items = -1;
   int day = 0;

   boolean tryAgain = true;
   //try catch loop to check for the input for the day is between 1 and 7 and is a number
   do {
       try {
           day = Integer.parseInt(JOptionPane.showInputDialog("Please enter the number according to the day of purchase: \n 1: Sunday\n 2: Monday\n 3: Tuesday\n 4: Wednesday\n 5: Thursday\n 6: Friday\n 7: Saturday"));

            if (day >= 1 && day <= 7){
          JOptionPane.showMessageDialog(null, "Day chosen.");
                tryAgain = false;
            }
             else if (day < 1 || day > 7){
               throw new NumberFormatException("Integer is out of range.");
            }
        }
        catch (NumberFormatException e1) { // Range check
           JOptionPane.showMessageDialog(null, "The number you entered is not between 1 and 6.  Try again.");
        }
        }
     while(tryAgain);
    //prompt for day to control selection
   // day = Integer.parseInt(JOptionPane.showInputDialog
   //("Please enter the number according to the day of purchase: \n 1: Sunday\n 2: Monday\n 3: Tuesday\n 4: Wednesday\n 5: Thursday\n 6: Friday\n 7: Saturday"));

   do {
   //try and catch to ensure the user input is only a numeric and is only 1-6
   try
   {
   retail_price = Double.parseDouble(JOptionPane.showInputDialog("Please enter the retail price of the item or a -1 if you have no more items"));

   }
   catch (NumberFormatException e)
   {
   JOptionPane.showMessageDialog(null, "ERROR! The number for the day must be numeric");
   }
   //if statements depending on the day input to run in the loop to adjust the prices
      if (day == 1 || day == 2){
      discount = 0;
      discount_amount = retail_price * discount;
      retail_price_after_discount = retail_price - discount_amount;
      total_retail_price = total_retail_price + retail_price;
      total_retail_price_after_discount = total_retail_price_after_discount + retail_price_after_discount;
      total_discount = total_discount + discount_amount;
      total_items++;
      }
         else if(day == 3){
         discount = .08;
         discount_amount = retail_price * discount;
         retail_price_after_discount = retail_price - discount_amount;
         total_retail_price = total_retail_price + retail_price;
         total_retail_price_after_discount = total_retail_price_after_discount + retail_price_after_discount;
         total_discount = total_discount + discount_amount;
         total_items++;
         }
            else if(day == 4){
            discount = .16;
            discount_amount = retail_price * discount;
            retail_price_after_discount = retail_price - discount_amount;
            total_retail_price = total_retail_price + retail_price;
            total_retail_price_after_discount = total_retail_price_after_discount + retail_price_after_discount;
            total_discount = total_discount + discount_amount;
            total_items++;
            }
               else if(day == 5){
               discount = .24;
               discount_amount = retail_price * discount;
               retail_price_after_discount = retail_price - discount_amount;
               total_retail_price = total_retail_price + retail_price;
               total_retail_price_after_discount = total_retail_price_after_discount + retail_price_after_discount;
               total_discount = total_discount + discount_amount;
               total_items++;
               }
                  else if(day == 6){
                  discount = .32;
                  discount_amount = retail_price * discount;
                  retail_price_after_discount = retail_price - discount_amount;
                  total_retail_price = total_retail_price + retail_price;
                  total_retail_price_after_discount = total_retail_price_after_discount + retail_price_after_discount;
                  total_discount = total_discount + discount_amount;
                  total_items++;
                  }
                      else if(day == 7){
                      discount = .40;
                      discount_amount = retail_price * discount;
                      retail_price_after_discount = retail_price - discount_amount;
                      total_retail_price = total_retail_price + retail_price;
                      total_retail_price_after_discount = total_retail_price_after_discount + retail_price_after_discount;
                      total_discount = total_discount + discount_amount;
                      total_items++;
                      }
                      else {
                        JOptionPane.showMessageDialog(null, "No items were entered");
                           }
                           //loop until the user input is -1
        } while(retail_price != -1);
        //output receipt
            JOptionPane.showMessageDialog
            (null, "Total number of items is: " + total_items + "\n" + "Total price without discount is: " + total_retail_price + "\n" + "Total price with the discount is: " + total_retail_price_after_discount + "\n" + "Total discount saved: " + total_discount);
      }
      }