import java.util.Random;  

/* Java application having as its purpose to test the solution() method
** of the SliderPuzzleSolver class.
**
** Author: R. McCloskey
** Date: April 2022
*/

public class SPS_Tester {

   /* Provided with command line arguments (or what jGrasp refers to as
   ** "run arguments") indicating the dimensions of a puzzle, a seed
   ** for a pseudo-random number generator, and a number of pseudo-random
   ** moves to make --starting with the standard goal configuration-- to
   ** obtain an initial configuration, this method uses the solution()
   ** method in the SliderPuzzleSolver class to find a minimum-length
   ** sequence of moves that transforms that initial configuration into
   ** the standard goal configuration.  This method then displays the
   ** configurations along that path of moves.
   */
   public static void main(String[] args) {
      int numRows = Integer.parseInt(args[0]);
      int numCols = Integer.parseInt(args[1]);
      int seed = Integer.parseInt(args[2]);
      Random rand = new Random(seed);
      int numMoves = Integer.parseInt(args[3]);

      SliderPuzzleConfig start = 
         new SliderPuzzleConfig(numRows, numCols, rand, numMoves); 

      System.out.println("Starting configuration is");
      start.display();
      System.out.println();

      String solution = SliderPuzzleSolver.solution(start);
      if (solution == null) {
         System.out.println("No solution was found.");
      }
      else {
         System.out.printf("Path of length %d found:\n\n", solution.length());
         displayPath(start, solution);
      }

      System.out.println("\nGoodbye.");
   }

   /* Displays the sequence of configurations starting with the one 
   ** given and proceeding according to the given sequence of moves.
   */
   public static void displayPath(SliderPuzzleConfig config, String moveSeq) {
      SliderPuzzleConfig spc = config.clone();
      spc.display();
      for (int i = 0; i != moveSeq.length(); i++) {
         char dir = moveSeq.charAt(i);
         spc.move(dir);
         System.out.printf("\nAfter moving %c:\n", dir);
         spc.display();
      }
   }

}