/**
 * PlayGame prompts the user for input and interacts to play the game of Yote.
 * This version uses Canvas, Square, and Circle classes to create a graphical
 * display of the output.
 * 
 * @author Dale Reed 
 * @version October 24, 2008
 */

import java.util.Scanner;

public class PlayGame
{
    /** keyboard is used to handle user input */
    private Scanner keyboard = new Scanner( System.in);
    /** theBoard is used to create a playing board, which in turn keeps track of the pieces */
    private Board theBoard;		// the playing board
    /** moveNumber keeps track of whose move it is, based on odd for "black" and even for "white" */
    private int moveNumber = 1;   	// odd moves mean "black", evens mean "white"
    /** index of where we are moving from */
	private int sourcePosition = -1;		
	/** index of where we are moving to */
	private int destinationPosition = -1;	
	/** constant definition of number of columns, used in validating moves */
	static final int NUMBER_OF_COLUMNS = 5;


    /**
     * main method chains off to method doIt() to avoid static errors.
     * 
     * @param args	command line arguments, which we're not using
     */
    public static void main(String[] args)
    {
    	PlayGame myInstance = new PlayGame(); 
    	myInstance.doIt();	// chain off to begin playing
    }
    
    
    /**
     * The "guts" of the program, calling the Board constructor and the loop handling user input.
     *
     */
    void doIt()
    {      
        // Display identifying information
        System.out.println( "Author: Dale Reed \n" +
                            "Program #3 solution\n" +
                            "TA: Englebert Humberdink, T 4-5 \n"+
                            "Oct 24, 2008");
        System.out.println();
                            
        // Display game instructions.  Modified from instructions taken from
        // 			http://homepages.di.fc.ul.pt/~jpn/gv/yote.htm
        System.out.println( 
			"Welcome to the ancient African game of Yote.\n" +
			"\n" +
			"On each turn, each player may either deploy a stone from their reserve \n" +
			"to any empty space on the board, or move a stone already on the board. Moves must \n" +
			"be made vertically or horizontally, but not diagonally. Stones move either by \n" +
			"sliding to an adjacent empty cell or by jumping over and capturing an adjacent \n" +
			"opponent's stone, landing in an empty square immediately beyond. When a Stone \n" +
			"captures another stone, the player may then select any other opponent stone on \n" +
			"the board (but not in their opponent's reserve) and capture it as well. \n" +
			"\n" +
			"The player who captures all of her opponent's stones wins. If either player is unable \n" +
			"to move, then the game ends and the player with the most stones on the board wins. If \n" +
			"both players are reduced to three or less stones, then the game is a draw. \n" +
			"\n" +
			"Possible inputs for each move: \n" +
			"   x        to exit program.  A message tells who has the most pieces. \n" +
			"   n1       to place a piece at postion n1, where n1 is a number 1..20 \n" +
			"   n1 n2    to move a piece from board position n1 to n2 \n" +
			"Black goes first.  Let's begin...\n" +
			" \n");
   	
    	theBoard = new Board();		// allocate memory and call the Board constructor
    	String playerToMove;		// will be "black" or "white", depending on the moveNumber  
    	 	
    	// main loop
    	while( true ) {
	    	// see whose move it is, based on the moveNumber
	    	if( moveNumber%2 == 1) {
	    		// odd numbered move, so it is the turn of "black"
	    		playerToMove = "black";
	    	}
	    	else {
	    		// even numbered move
	    		playerToMove = "white";
	    	}
	    	
	    	// prompt for and get user input
	        System.out.print(moveNumber + ". Enter move for " + playerToMove + ": ");
	        String userInput = keyboard.nextLine();
	        // convert to lower case, in case it is alphabetic
	        userInput = userInput.toLowerCase();
	        
	        // see if 'x' to exit was entered
	        if( userInput.charAt( 0) == 'x') {
	        	break;
	        }
	         
	        // Extract the index of the location where piece should be placed
	        destinationPosition = Integer.parseInt( userInput);
	        theBoard.placePiece( playerToMove, destinationPosition);
	        
	        // update the move number
	        moveNumber++;
    	} //while (true   // main loop 	              

        System.out.println("Thanks for playing.  Exiting program... ");
        
    }//end method doIt()
    
  
    
}// end class TestDrawing()