Entity.java

import java.util.ArrayList;

/**
 * A class to handle all living, breathing creatures
 */
public class Entity {
    private String name;
    private int HP;
    private int MaxHP;          //Sets itself to whatever HP is on creation
    private int STR;
    private int hunger;         //Current hunger, starts at 100
    private double mood;        //Current mood value
    private double moodMult;    //Increase or decreases depending on external factors, used to determine mood
    private boolean isAlive;
    private ArrayList<Item> contains = new ArrayList<>();   //Inventory

    /**
     * Constructor for Entity
     *
     * @param name The String name of this Entity
     * @param HP   This Entity' initial HP, set to MaxHP as well
     * @param STR  The Entity's physical strength
     */
    public Entity(String name, int HP, int STR) {
        this.name = name;
        this.HP = HP;
        this.MaxHP = HP;
        this.STR = STR;
        this.hunger = 100;
        this.mood = 100;
        this.isAlive = true;
    }

    /**
     * Returns the contents of an Entity's inventory
     */
    public void inventory() {
        System.out.println("The " + name + " contains: ");
        if (contains.size() > 0) {                      //If there's at least one Item in the inventory
            for (int i = 0; i < contains.size(); ) {    //Then print all the items
                System.out.println(contains.get(i));
                i++;
            }
        } else {
            System.out.println("Nothing");      //If there's no items in the inventory say "nothing"
        }
    }

    /**
     * Places an Item into the Entity's inventory
     *
     * @param that What Item is being added to the inventory
     */
    public void ItemGet(Item that) {
        if (isAlive != false) {
            System.out.println(name + " has picked up " + that);
            contains.add(that);
        } else {
            System.out.println(name + " cannot pickup the " + that + " because " + name + " is dead.");
        }
    }

    /**
     * Removes an Item into the Entity's inventory
     *
     * @param that What Item is being removed from the inventory
     */
    public void ItemDrop(Item that) {
        if (isAlive != false) {
            System.out.println(name + " has dropped " + that);
            contains.remove(that);
        } else {
            System.out.println(name + " cannot drop the " + that + " because " + name + " is dead.");
        }
    }

    /**
     * Represents a passage of time, instructs Entity to update hunger, mood, etc.
     */
    public void update() {
        if (this.isAlive != false)           //While this Entity is alive
        {
            this.hunger -= 5;
            this.mood -= moodMult;
            System.out.println("Hunger: " + hunger + " Mood: " + mood);
            hunger();
            mood();
        } else {
            System.out.println(name + " is dead.");
        }
    }

    /**
     * Handles the hunger of Entity, updates String to represent the Entity's hunger
     * turns "isAlive" to false if hunger drops to zero or below
     */
    private void hunger() {
        if (this.hunger >= 90) {
            System.out.println(name + " isn't hungry");
            moodMult = 0.5;
        } else if (this.hunger <= 85 && this.hunger >= 60) {
            moodMult = 0.5;
            System.out.println(name + " is getting fairly hungry");
        } else if (this.hunger < 60 && this.hunger >= 40) {
            moodMult = 1.0;
            System.out.println(name + " is very hungry");
        } else if (this.hunger < 40 && this.hunger >= 20) {
            System.out.println(name + " is extremely hungry");
            moodMult = 5.0;
        } else if (this.hunger <= 0) {
            this.isAlive = false;
            System.out.println(name + " has died of starvation.");
        } else {
            moodMult = 10.0;
            System.out.println(name + " is starving!");
        }
    }

    /**
     * Handles the mood of an Entity
     */
    private void mood() {
        if (this.mood >= 90) {
            System.out.println(name + " is very happy");
        } else if (this.mood <= 89 && this.mood >= 60) {
            System.out.println(name + " is happy");
        } else if (this.mood < 60 && this.mood >= 40) {
            System.out.println(name + " is feeling a little uncomfortable");
        } else if (this.mood < 40 && this.mood >= 20) {
            System.out.println(name + " is feeling sad");
        } else if (this.mood <= 0) {
            this.isAlive = false;
            System.out.println(name + " is devoid of happiness.");
        } else {
            System.out.println(name + " is incredibly depressed!");
        }
    }
}