snake/src/main/dev/lh/FoodFactory.java

package dev.lh;

import java.awt.*;

import dev.lh.ui.GameWindow;

/**
 * Project: <strong>Snake</strong><br>
 * File: <strong>FoodFactory.java</strong><br>
 * Created: <strong>11 Mar 2020</strong><br>
 *
 * @author Leon Hofmeister
 * @since Snake 1.0
 */
public class FoodFactory {

	/**
	 * This enum contains all possible variations of foods. The higher the ordinal
	 * of an element, the less it is worth.<br>
	 * <br>
	 * Project: <strong>Snake</strong><br>
	 * File: <strong>FoodFactory.java</strong><br>
	 * Created: <strong>11 Mar 2020</strong><br>
	 *
	 * @author Leon Hofmeister
	 * @since Snake 1.0
	 */
	public static enum Food {
		/**
		 * Use if white food is wanted.
		 */
		white,

		/**
		 * Use if yellow food is wanted.
		 */
		yellow,

		/**
		 * Use if orange food is wanted.
		 */
		orange,

		/**
		 * Use if red food is wanted.
		 */
		red,

		/**
		 * Use if blue food is wanted.
		 */
		blue
	}

	private static FoodFactory foodFactory = new FoodFactory();

	private long timeOfNextFood;

	Point pFood = null;

	private Food nextFood = Food.white;

	private int rectangleSize = 6;

	private FoodFactory() {}

	/**
	 * @return the (singleton) instance of FoodFactory
	 * @since Snake 1.0
	 */
	public static FoodFactory getInstance() { return foodFactory; }

	/**
	 * @return a new {@link Food} object without its position
	 * @since Snake 1.0
	 */
	public Food generateFood() {
		int nextFoodIs = (int) Math.floor(Math.random() * 5);
		switch (nextFoodIs) {

			case 0:
				nextFood = Food.white;
				break;
			case 1:
				nextFood = Food.yellow;
				break;
			case 2:
				nextFood = Food.orange;
				break;
			case 3:
				nextFood = Food.red;
				break;
			case 4:
				nextFood = Food.blue;
				break;
			default:
				nextFood = generateFood();
		}
		rectangleSize = nextFood.ordinal() + 2;
		setTimeToNextFoodMillis();
		return nextFood;
	}

	/**
	 * Generates the amount of time that needs to pass before the next food object
	 * will be constructed.
	 *
	 * @since Snake 1.0
	 */
	public void setTimeToNextFoodMillis() { timeOfNextFood = System.currentTimeMillis() + (int) Math.round(Math.random() * 15000 + 1000); }

	/**
	 * @return the type of the next food
	 * @since Snake 1.0
	 */
	public Food getNextFood() { return nextFood; }

	/**
	 * @param nextFood the type the next food should have
	 * @since Snake 1.0
	 */
	public void setNext(Food nextFood) { this.nextFood = nextFood; }

	/**
	 * @return the time at which a new food object will be automatically created
	 * @since Snake 1.0
	 */
	public long getTimeOfNextFood() { return timeOfNextFood; }

	/**
	 * @param width  the width of the currently used {@link GameWindow}
	 * @param height the height of the currently used {@link GameWindow}
	 * @return the position of the new {@link Food} object
	 * @since Snake 1.0
	 */
	public Point generateFoodLocation(int width, int height) {
		pFood = new Point((int) Math.round(Math.random() * width), (int) Math.round(Math.random() * height));
		if (pFood.x < 50 || pFood.x > width - 50 || pFood.y < 50 || pFood.y > height - 50) {
			pFood.x	= (pFood.x < 50) ? 50 : (pFood.x > width - 50) ? width - 50 : pFood.x;
			pFood.y	= (pFood.y < 50) ? 50 : (pFood.y > height - 50) ? height - 50 : pFood.y;
		}
		return pFood;
	}

	/**
	 * @return the size of the corresponding food (length = width)
	 * @since Snake 1.0
	 */
	public int getRectangleSize() { return rectangleSize; }

	/**
	 * @return the location of the currently displayed food
	 * @since Snake 1.0
	 */
	public Point getFoodLocation() { return pFood; }

	/**
	 * Sets the color of the given {@link Graphics} object according to the type of
	 * food.
	 *
	 * @param g the graphics object to paint
	 * @since Snake 1.0
	 */
	public void colorOfFood(Graphics g) {
		switch (nextFood) {
			case white:
				g.setColor(Color.white);
				break;
			case yellow:
				g.setColor(Color.yellow);
				break;
			case orange:
				g.setColor(Color.orange);
				break;
			case red:
				g.setColor(Color.red);
				break;
			case blue:
				g.setColor(Color.blue);
				break;
		}// switch
	}

	/**
	 * @param g the {@link Graphics} object used to paint the current food object
	 * @since Snake 1.0
	 */
	public void paintFood(Graphics g) {
		colorOfFood(g);
		g.fillRect(pFood.x, pFood.y, 5 * rectangleSize, 5 * rectangleSize);
	}

	/**
	 * @param snakeHead the the head of a {@link Snake} object
	 * @return true if the current food intersects with the snakehead
	 * @since Snake 1.0
	 */
	public boolean checkCollision(Rectangle snakeHead) {
		int			s		= rectangleSize * 5;
		Rectangle	food	= new Rectangle(pFood, new Dimension(s, s));
		return food.intersects(snakeHead);
	}

	/**
	 * @return the length that will be added to the snake
	 * @since Snake 1.0
	 */
	public int getAdditionalLength() {
		int snakeAdditionalLength = 0;
		switch (nextFood) {
			case white:
				snakeAdditionalLength = 40;
				break;
			case yellow:
				snakeAdditionalLength = 15;
				break;
			case orange:
				snakeAdditionalLength = 6;
				break;
			case red:
				snakeAdditionalLength = 2;
				break;
			case blue:
				snakeAdditionalLength = 1;
				break;
		}
		return snakeAdditionalLength;
	}
}