TextGameDisplay.java

/**
* TextGameDisplay.java
*
* @author Deep Patel
*
* REMARKS: This class implements the game display and user input
* in order to play the game
*/

import java.util.Scanner;

class TextGameDisplay implements GameDisplay {
    private Scanner scanner;

    //Constructor
    TextGameDisplay() {
        this.scanner = new Scanner(System.in);
    }

     /**
   * promptForOpponentDifficulty will be called at the beginning of each match. The method will be
   * given the maximum difficulty of the AI (a positive integer greater than or equal to two). The
   * method will return a value between 1 and maxDifficulty, indicating the human player’s choice of
   * which game AI to play against.
   *
   * Parameters:
   * int maxDifficulty
   *
   * Returns the difficulty selected
   */
    public int promptForOpponentDifficulty(int maxDifficulty) {
        System.out.println("Please enter the desired opponent difficulty, between 0 and " + maxDifficulty +
                ", where 0 is easiest opponent and " + maxDifficulty + " is hardest opponent.");
        int difficulty = scanner.nextInt();
        if (difficulty < 0 || difficulty > maxDifficulty) {
            difficulty = promptForOpponentDifficulty(maxDifficulty);
        }
        return difficulty;
    }

     /**
   * This method is used to ask the player for a move
   *
   * Returns the move player wants to make
   */
    public Move promptForMove() {
        Move move = null;
        System.out.println("Please enter the row of the piece you would like to move. Enter 0 to forfeit game.");
        int fromRow = scanner.nextInt();
        if (fromRow == 0) {
            return new Move(0, 0, 0, 0, true, true);
        }

        System.out.println("Please enter the column of the piece you would like to move.");
        int fromCol = scanner.nextInt();

        System.out.println("Please enter the row of the destination.");
        int toRow = scanner.nextInt();

        System.out.println("Please enter the column of the destination.");
        int toCol = scanner.nextInt();

        if (toCol>8||toCol<0||fromCol>8||fromCol<0||toRow>8||toRow<0||fromRow>8||fromRow<0){
            move = promptForMove();
        }else{
            move = new Move(fromRow, fromCol, toRow, toCol, true, false);
        }
        return move;
    }

    //Displays the current state of the game board with all the pieces
    //Is passed in the board of the game
    public void displayBoard(Board board) {
        System.out.println("  1 2 3 4 5 6 7 8");
        System.out.println("------------------");
        for (int i = 0; i < 8; i++) {
            System.out.print((i + 1) + "|");
            for (int j = 0; j < 8; j++) {
                System.out.print(board.getSymbol(i, j) + "|");
            }
            System.out.println("\n------------------");
        }
    }

     /**
   * This method is used to summarize the move that currently took place
   *
   * Parameters:
   * Board board - The method take in the current state of the board
   * Move move - Move that is being summarized
   *
   */
    public void summarizeMove(Move move, Board board) {
        if (move.getForfeit()) {
            System.out.println("You forfeit. Game over!");
            return;
        }

        if (move.getValid()) {
            Piece p = move.getPiece();
            String piece = getPieceString(p);

            if (move.getPrevPiece() != null) {
                String prevPiece = getPieceString(move.getPrevPiece());
                System.out.println(piece + " moved from (" + move.getFromRow() + ", " + move.getFromCol() + ") to (" + move.getToRow()
                        + ", " + move.getToCol() + ")." + prevPiece + " captured.");
            } else {
                System.out.println(piece + " moved from (" + move.getFromRow() + ", " + move.getFromCol() + ") to (" + move.getToRow()
                        + ", " + move.getToCol() + "). No capture made.");
            }
        } else {
            System.out.println("The move you have entered is invalid. Please enter another move.");
        }
    }

    //Used to identify who the winner is
    public void gameOver(int winner) {
        if (winner == 0) {
            System.out.println("You win! Congratulations!");
        } else if (winner == 1) {
            System.out.println("You lose! Better luck next time!");
        } else {
            System.out.println("You forfeit. Game Over!");
        }
    }

    //Asks the user if they want to play again
    //Returns boolean on whether they want to play
    public boolean promptPlayAgain() {
        boolean play;
        System.out.println("Would you like to play again? Please enter 0 for yes or 1 for no.");
        int choice = scanner.nextInt();
        if (choice == 0) {
            play = true;
        } else if (choice == 1) {
            play = false;
        } else {
            play = promptPlayAgain();
        }
        return play;
    }

    //Used to get the word for each piece in order to print it
    private String getPieceString(Piece p) {
        String piece = "";
        if (p instanceof Pawn) {
            piece = "Pawn";
        } else if (p instanceof Rook) {
            piece = "Rook";
        } else if (p instanceof Knight) {
            piece = "Knight";
        } else if (p instanceof Bishop) {
            piece = "Bishop";
        } else if (p instanceof King) {
            piece = "King";
        } else if (p instanceof Queen) {
            piece = "Queen";
        }
        return piece;
    }
}