using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.Events;
 public class PlayerNeeds : MonoBehaviour, IDamagable
 {
    public Need health;
    public Need hunger;
    public Need thirst;
    public Need sleep;
    public float noHungerHealthDecay;
    public float noThirstHealthDecay;
    public UnityEvent onTakeDamage;
    void Start ()
    {
        // set the start values
        health.curValue = health.startValue;
        hunger.curValue = hunger.startValue;
        thirst.curValue = thirst.startValue;
        sleep.curValue = sleep.startValue;
    }
    void Update ()
    {
        // decay needs over time
        hunger.Subtract(hunger.decayRate * Time.deltaTime);
        thirst.Subtract(thirst.decayRate * Time.deltaTime);
        sleep.Add(sleep.regenRate * Time.deltaTime);
        // decay health over time if no hunger or thirst
        if(hunger.curValue == 0.0f)
            health.Subtract(noHungerHealthDecay * Time.deltaTime);
        if(thirst.curValue == 0.0f)
            health.Subtract(noThirstHealthDecay * Time.deltaTime);
            // check if player is dead
        if(health.curValue == 0.0f)
        {
            Die();
        }
        // update UI bars
        health.uiBar.fillAmount = health.GetPercentage();
        hunger.uiBar.fillAmount = hunger.GetPercentage();
        thirst.uiBar.fillAmount = thirst.GetPercentage();
        sleep.uiBar.fillAmount = sleep.GetPercentage();
    }
    // adds to the player's HEALTH
    public void Heal (float amount)
    {
        health.Add(amount);
    }
    // adds to the player's HUNGER
    public void Eat (float amount)
    {
        hunger.Add(amount);
    }
    // adds to the player's THIRST
    public void Drink (float amount)
    {
        thirst.Add(amount);
    }
    // subtracts from the player's SLEEP
    public void Sleep (float amount)
    {
        sleep.Subtract(amount);
    }
    // called when the player takes physical damage (fire, enemy, etc)
    public void TakePhysicalDamage (int amount)
    {
        health.Subtract(amount);
        Debug.Log("Player took " + amount + " damage.  Current health: " + health.curValue); // ADDED
        onTakeDamage?.Invoke();
    }
    // called when the player's health reaches 0
    public void Die ()
    {
        Debug.Log("Player is dead");
    }
 }
 [System.Serializable]
 public class Need
 {
    [HideInInspector]
    public float curValue;
    public float maxValue;
    public float startValue;
    public float regenRate;
    public float decayRate;
    public Image uiBar;
    // add to the need
    public void Add (float amount)
    {
        curValue = Mathf.Min(curValue + amount, maxValue);
    }
    // subtract from the need
    public void Subtract (float amount)
    {
        curValue = Mathf.Max(curValue - amount, 0.0f);
    }
    // return the percentage value (0.0 - 1.0)
    public float GetPercentage ()
    {
        return curValue / maxValue;
    }
 }
 public interface IDamagable
 {
    void TakePhysicalDamage(int damageAmount);
 }