import java.awt.Color;

import acm.graphics.GLabel;
import acm.graphics.GRect;
import acm.program.GraphicsProgram;

/**
 *
 * Draws a chessboard with gray and white Rectangles and even the row and column
 * designators.
 *
 */
public class Chessboard extends GraphicsProgram {

    private static final String[] DESIGNATOR_NUM = { "0", "8", "7", "6", "5", "4", "3", "2", "1" };
    private static final String[] DESIGNATOR_LET = { "0", "A", "B", "C", "D", "E", "F", "G", "H" };

    public static final int FIELD_SIZE = 100;

    @Override
    public void run() {
        setSize(1000, 1000);
        drawChessboard(FIELD_SIZE);
        super.run();
    }

    /**
     *
     * Draws the chestboard with a size that can be set by the user as well as the
     * Designators to the sides of the playfield.
     *
     * @param size size of the rectangles that should be drawn.
     */
    public void drawChessboard(int size) {
        // Draw the Chessfield with Changing colors
        for (int x = 1; x <= 8; x++) {
            for (int y = 1; y <= 8; y++) {
                if (y % 2 == 0 && x % 2 != 0 || y % 2 != 0 && x % 2 == 0) {
                    GRect rect = new GRect(x * size, y * size, size, size);
                    rect.setFilled(true);
                    rect.setFillColor(Color.GRAY);
                    add(rect);
                }
            }
        }
        // Draw Designators A to H at the top row
        for (int i = 1; i <= 8; i++) {
            GLabel label = new GLabel(DESIGNATOR_LET[i], i * FIELD_SIZE + FIELD_SIZE / 2, 75);
            label.setFont("SansSerif-30");
            add(label);
        }
        // Draw Designators A to H at the bottom row
        for (int i = 1; i <= 8; i++) {
            GLabel label = new GLabel(DESIGNATOR_LET[i], i * FIELD_SIZE + FIELD_SIZE / 2, 950);
            label.setFont("SansSerif-30");
            add(label);
        }
        // Draw Designators 1 to 8 on the left side
        for (int i = 1; i <= 8; i++) {
            GLabel label = new GLabel(DESIGNATOR_NUM[i], 50, i * FIELD_SIZE + FIELD_SIZE / 2);
            label.setFont("SansSerif-30");
            add(label);
        }
        // Draw Designators 1 to 8 on the right side
        for (int i = 1; i <= 8; i++) {
            GLabel label = new GLabel(DESIGNATOR_NUM[i], 925, i * FIELD_SIZE + FIELD_SIZE / 2);
            label.setFont("SansSerif-30");
            add(label);
        }
    }

}