import java.util.Scanner;

/* Java application whose purpose is to test various Java classes that
** implement the RedBlueClassifier interface. 
** 
** Author: R. McCloskey
** Date: April 2026
*/
public class Tester {

   public static void main(String[] args) {

      // Display menu for user.
      System.out.println("Choose among these:");
      System.out.println("  (1) Classify integers by prime vs. nonprime");
      System.out.println("  (2) Classify integers by negative vs. nonnegative");
      System.out.println("  (3) Classify integers by small vs. big");
      System.out.println("  (4) Classify Strings by word vs. nonword");
      System.out.print("\n> ");

      // Get user's response.
      Scanner s = new Scanner(System.in);
      int response = s.nextInt();

      // Establish variable f to refer to a RedBlueFilter that
      // filters according to the criteria chosen by the user.
      RedBlueFilter rbf = null; 

      if (response == 1) { 
         rbf = new RedBlueFilter<Integer>(new PrimeVsComposite());
      }
      else if (response == 2) { 
         rbf = new RedBlueFilter<Integer>(new NegVsPosInt());
      }
      else if (response == 3) { 
         System.out.println("Enter smallest big number: ");
         int lowestBig = s.nextInt();
         rbf = new RedBlueFilter<Integer>(new SmallVsBigInt(lowestBig));
      }
      else if (response == 4) { 
         rbf = new RedBlueFilter<String>(new WordVsNonWord());
      }
      else {
         System.out.println("Invalid response; aborting program");
         System.exit(0); 
      }

      // Make an array x[] filled with either some integers or Strings
      // in accord with the kind of values the user has chosen.
      Object[] x;
      if (response < 4) {
         x = new Integer[] { 3, -4, 77, 0, 95, -2, -5, 64,
                              13, -1, 41, -22, 0, 27, 23 };
      }
      else {
         x = new String[] { "glorp", "25.54", "two_words", "ab%6cd",
                            "spock", "xyz@#$%uv", "the", "dog", "4+7",
                            "hello", "Scranton", "R2D2" };
      }

      // Display the pre-partitioned array.
      System.out.println("\nArray elements:");
      displayArraySegment(x, 0, x.length);
      System.out.println();

      // Filter x[] to display its RED elements
      System.out.println("\nElements that are RED:");
      rbf.filter(x, true);

      System.out.println("\nElements that are BLUE:");
      rbf.filter(x, false);

      System.out.println();
   }


   /* Displays the elements in the given array segment (z[low..high)).
   */
   private static void displayArraySegment(Object[] z, int low, int high)
   {
      for (int i = low; i != high; i++) 
         { System.out.print(z[i] + " "); }
   }

}