// Whitaker Brand
// CSE142
// Section BB
// TA: Althea Poteet
// 1/24/2018
//
// This program is an example of processing user input using a Scanner,
// and cumulative algorithms.
//
// (implementation details for class:)
// This program is a good example of method decomposition, using 3 methods
// to add structure and reduce redundancy.
//
// It still has some weaknesses:
//  - redundant printlns in main regarding total cost
//  - class constant for number of friends is suboptimal:
//    -- better would be to prompt for the number of friends,
//       and have the dinner cost message be based on an average
//       cost per person
import java.util.*;
public class Restaurant {
   public static final int FRIEND_COUNT = 3;

   public static void main(String[] args) {
      // NOTE: when using a System.in Scanner, it is better to declare only one
      //       of these in main, and pass it as a parameter (instead of declaring
      //       a new one in each method where it is needed)
      Scanner console = new Scanner(System.in);
      double aTotal = dinnerCost(console);
      System.out.println("Oh, it looks like group A spent $" + aTotal + " on dinner.");
      double bTotal = dinnerCost(console);
      System.out.println("Oh, it looks like group B spent $" + bTotal + " on dinner.");
      System.out.println("A's dinner was " + priceRange(aTotal));
      System.out.println("B's dinner was " + priceRange(bTotal));
   }

   // prints out an explanation of what the program does
   public static void intro() {
      System.out.println("This program prompts the user for input");
      System.out.println("regarding the total money spent by two");
      System.out.println("different groups of friends eating at a");
      System.out.println("restaurant");
   }

   // given a dollar amount representing a dinner for FRIEND_COUNT people,
   // returns a String representing whether that dinner was inexpensive,
   // moderately priced, or expensive.
   public static String priceRange(double totalCost) {
      if (totalCost < 20.0) {
         return "inexpensive";
      } else if (totalCost < 60.0) {
         return "moderately priced";
      } else {
         return "expensive";
      }
   }
   
   // Accepts a user input Scanner as a parameter, prompts the user
   // for how much each friend spent on dinner, and returns the total
   // cost of the dinners
   public static double dinnerCost(Scanner console) {
      double total = 0.0;
      for (int i = 1; i <= FRIEND_COUNT; i++) {
         System.out.print("Friend #" + i + ", how much did your dinner cost? ");         
         total = total + console.nextDouble();
         // these lines are equivalent to the above line, except
         // that they store an extra variable, so they are less
         // preferable.
         // double thisFriendCost =  console.nextDouble();
         // total += thisFriendCost;
      }
      return total;
   }
}