import java.io.*;

public class PlayPuzzle {

    public static String type = "array";
    public static boolean playAgain = true;
    public static int moves;
    public static final int SIZE = 3;
    public static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); 
    public static IPuzzle puzzle;

    // Play 3x3 game:
    public static void main (String[] args) {
	setGameParameters(args); // user's game settings
	welcomeUser();           // say hello
	playGame();              // single game play
    }
    
    // Change game settings:
    private static void setGameParameters(String[] args) {
	// Get type commandline; default type is array if nothing entered:
	if (args.length > 0) type = args[0];
    }
    
    // Welcome the user:
    private static void welcomeUser() {
	System.out.println("Welcome to Puzzle!");
	System.out.println("Press Return to quit at any time.");
	System.out.println();
    }

    // Play one game:
    private static void playGame() {

	// Create the puzzle:
	if (type.equals("array"))
	    puzzle = new PuzzleAsArray();
	else if (type.equals("int"))
	    puzzle = new PuzzleAsInt();
	else if (type.equals("string"))
	    puzzle = new PuzzleAsString();
	else {
	    System.out.println("Type of puzzle ("+type+") not recognized!");
	    System.exit(0);
	}

	// Scramble the puzzle:
	puzzle.scramble();

	// Show current state:
	System.out.println("Current state of puzzle:");
	puzzle.display();

	// Make tile moves until the puzzle is solved:
	while( !puzzle.isSolved() ) {
	    System.out.println("The puzzle isn't solved yet.");
	    
	    // Move a tile into the blank space and test the puzzle again:
	    char tryMove = getMove();		
	    while( !puzzle.move(tryMove) ) {
		System.out.println("You cannot move a tile in that direction.");
		tryMove = getMove();
	    }

	    // Keep track of valid moves made:
	    moves++; 

	    // Show current state:
	    System.out.println("Current state of puzzle:");
	    puzzle.display();
	}

	// Done!
	System.out.println("Congratulations!");
	System.out.println("Number of moves you took: "+moves+".");

    }

    // Get a character move:
    private static char getMove() {

	// Get user input:
	char move=' ';
	String user1,user2;
	try { 
	    System.out.print("Enter a move [NSEW]: ");
	    move=((in.readLine()).toUpperCase()).charAt(0);
	    while  ( !(move=='N' || move=='S' || move=='E' || move=='W') ) {
		System.out.print("I do not recognize that move. ");
		System.out.print("Enter a real move [NSEW]: ");
		move = ((in.readLine()).toUpperCase()).charAt(0);
	    }
	}
	catch(Exception e) { 
	    System.out.println("Quitting!");
	    System.exit(0);
	}
	 
	System.out.println();
	return move;
    }


} // Class PlayPuzzle