package edu.dartmouth.cs.kalah;

/**
 * A text implementation of the "view" part of a model-view-controller 
 *   version of a Kalah program.  (See Kalah.java for history.)
 * See KalahView interface for comments on the required methods.
 * 
 * @author Scot Drysdale
 */

import java.util.Scanner;
import java.util.InputMismatchException;

public class KalahViewText implements KalahView {
	
	private Scanner input;   // Hold  the input stream
	
	public KalahViewText (){
		input = new Scanner(System.in);
	}

	@Override
	public void display (KalahGame state) 
  // Postcondition:  Displays the current board
  {
		int [] board = state.getBoard();
		KalahPlayer [] players = state.getPlayers();
		
    System.out.println();
    System.out.println("            " + players[1].getName());
    System.out.println();
    System.out.print("     ");
    for (int i = KalahGame.NUMPITS - 1; i > KalahGame.HALFPITS; i--) 
      System.out.print(CSJavaLib.padIntRight(board[i], 4));
    System.out.println();
  
    System.out.println(CSJavaLib.padIntRight(board[0], 5) + 
        "                          " + CSJavaLib.padIntRight(board[KalahGame.HALFPITS], 5));

   System.out.print("     ");
    for (int i = 1; i <= KalahGame.SIDEPITS; i++)
      System.out.print(CSJavaLib.padIntRight(board[i], 4));
    System.out.println();
    
    System.out.println();
    System.out.println("            " + players[0].getName());
  }
	
	@Override
	public int getUserMove(KalahGame state) {
		int pit;  // The pit under consideration
		int [] board = state.getBoard();
		
		System.out.println();
    
    pit = getIntAnswer("Pit to empty, " + state.getPlayerToMove().getName() + "? ");

    while ((pit < 1) || (pit > KalahGame.SIDEPITS) || 
    		(board[pit + state.getPlayerNum()*KalahGame.HALFPITS] == 0)) 
    {
      System.out.println("Illegal move.  Try again.");
      pit = getIntAnswer("Pit to empty? ");
    }
    
    return pit + state.getPlayerNum()*KalahGame.HALFPITS; // Adjust to player's side

	}
	
	@Override
	public void reportMove (int bestMove, String name) {
		System.out.println("\n" + name + " empties pit " + bestMove);
	}

  
	@Override
  public int getIntAnswer(String question) {
  	int answer = 0;
  	boolean valid = false;
  	
  	// Ask for a number
    System.out.print(question + " ");   
  	while(!valid) {
  		try {
        answer = input.nextInt();;
        valid = true;   // If got to here we have a valid integer
  		}
  		catch(InputMismatchException ex) {
  			reportToUser("That was not a valid integer");
  			valid = false;
  			input.nextLine();  // Throw away the rest of the line
  	    System.out.print(question + " ");   
  		}
  	}
  	input.nextLine();  // Throw away the rest of the line
  	
    return answer;
  }
  
  @Override
  public void reportToUser(String message) {
  // Reports something to the user
  	System.out.println(message);
  }

  @Override
  public String getAnswer(String message) {
  	System.out.print(message);
  	return input.nextLine();
  }
}