/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-03-17
 * Description: This is the Chicken class.
 */

public class Chicken {
	/*
	 * The weight instance variable indicates the current weight of the chiken.
	 */
	private double weight;

	/*
	 * The sleeping instance variable indicates whether the chicken is currently
	 * sleeping or not.
	 * It is intially sleeping.
	 */
	private boolean sleeping;

	/**
	 * Constructor: Chicken(double weight)
	 * 
	 * @param weight
	 *               The weight of the chicken.
	 *               The weight must be greater than 0. If the weight is less than
	 *               0, the weight is set to 0.
	 */
	public Chicken(double weight) {
		if (weight < 0) {
			this.weight = 0;
		} else {
			this.weight = weight;
		}

		// initially the chicken is sleeping
		this.sleeping = true;
	}

	/**
	 * Getter method: getWeight()
	 *
	 * @return The weight of the chicken.
	 */
	public double getWeight() {
		return this.weight;
	}

	/**
	 * Getter method: isSleeping()
	 *
	 * @return true if the chicken is sleeping, false otherwise.
	 */
	public boolean isSleeping() {
		return this.sleeping;
	}

	/**
	 * Makes the chicken fall asleep. Or do nothing if the chicken is already
	 * sleeping.
	 * 
	 * @return void
	 */
	public void fallAsleep() {
		this.sleeping = true;
	}

	/**
	 * Makes the chicken wake up. Or do nothing if the chicken is already awake.
	 * 
	 * @return void
	 */
	public void wakeUp() {
		this.sleeping = false;
	}

	/**
	 * Tests function.
	 */
	public static void testChicken() {
		Chicken c = new Chicken(2.3);
		System.out.println(c.getWeight() == 2.3);
		System.out.println(c.isSleeping() == true);
		c.wakeUp();
		System.out.println(c.isSleeping() == false);
		c.wakeUp(); // should do nothing because the chicken is already awake
		System.out.println(c.isSleeping() == false);
		c.fallAsleep();
		System.out.println(c.isSleeping() == true);
		c.fallAsleep(); // should do nothing because the chicken is already sleeping
		System.out.println(c.isSleeping() == true);
	}
}