import java.util.Scanner;

/* Application program that exercies the methods in the SetOfStrings class.
*/
public class SetOfStrApp {

   private static Scanner keyboard;  // for reading user input
   private static boolean keepGoing; // for loop control
   private static SetOfStrings set; 

   public static void main(String[] args) {
      System.out.println("Welcome to the Set Of Strings Application.");
      keyboard = new Scanner(System.in);
      int cap = getInt("Enter desired set capacity: ");
      set = new SetOfStrings(cap);

      keepGoing = true;
      //printHelp();
      while (keepGoing) {
         try { 
            performCommand();
         }
         catch (Exception e) {
            e.printStackTrace(System.out);
         }
      }
      System.out.println("Goodbye.");
   }

   /* Prompts the user to enter a command and then carries it out.
   */
   private static void performCommand() {
      boolean validCommand = true;
      String[] command = getString("\n> ").split("\\s+");

      if (command.length == 0)
         { validCommand = false; }

      else if (command.length == 1) {
         String code = command[0];
         if (code.equals("q")) { keepGoing = false; }
         else if (code.equals("h")) { printHelp(); }
         else if (code.equals("p")) { set.display(); }
         else if (code.equals("t")) { set.displayTable(); }
         else if (code.equals("n")) { 
            System.out.printf("set has %d members",  
                              set.numberOfMembers());
         }
         else { validCommand = false; }
      }
      else if (command.length == 2) {
         String code = command[0];
         String str = command[1];
         if (code.equals("m"))
            { println(set.isMemberOf(str) ? "yes" : "no"); } 
         else if (code.equals("i")) { 
            set.insert(str);
            set.displayTable();
         } 
         else if (code.equals("r")) { 
            set.remove(str);
            set.displayTable();
         } 
         else { validCommand = false; }
      }
      else 
         { validCommand = false; }

      if (!validCommand) {
         println("Command not recognized; enter h for help");
      } 
   }

   /* Prints the specified prompt and returns the integer value
   ** entered in response.
   */
   private static int getInt(String prompt) {
      System.out.print(prompt);
      int response = keyboard.nextInt();
      keyboard.nextLine();
      return response;
   }

   /* Prints the specified prompt and returns the String 
   ** entered in response.
   */
   private static String getString(String prompt) {
      System.out.print(prompt);
      return keyboard.nextLine();
   }


   /* Prints the menu of available commands.
   */
   private static void printHelp() {
      println("q         (quit)");
      println("h         (print this help menu)");
      println("p         (print the whole set)");
      println("t         (print the table)");
      println("n         (report the # of members)");
      println("i glorp   (insert \"glorp\")");
      println("r glorp   (remove \"glorp\")");
      println("m glorp   (report whether \"glorp\" is a member)");
   }

   /* Surrogate for System.out.println().
   */
   private static void println(String s) {
      System.out.println(s);
   }
   
}