HealthController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using UnityEngine.Events;

public class HealthController : MonoBehaviour
{
    [SerializeField] private float currentHealth;
    [SerializeField] private float maximumHealth;

    public float RemainingHealthPercentage
    {
        get
        {
            return currentHealth / maximumHealth;
        }
    }


    public bool IsInvincible { get; set; }
    public UnityEvent OnDied;
    public UnityEvent OnDamaged;

    public UnityEvent OnHealthChanged;

    public void TakeDamage(float damageAmount)
    {
        if (currentHealth == 0)
        {
            return;
        }

        if (IsInvincible)
        {
            return;
        }
        currentHealth -= damageAmount;

        OnHealthChanged.Invoke();


        if (currentHealth < 0)
        {
            currentHealth = 0;
        }

        if (currentHealth == 0)
        {
            OnDied.Invoke();
        }
        else
        {
            OnDamaged.Invoke();
        }


    }

    public void AddHealth(float amountToAdd)
    {
        if (currentHealth == maximumHealth)
        {
            return;
        }
        currentHealth += amountToAdd;

        OnHealthChanged.Invoke();

        if (currentHealth > maximumHealth)
        {
            currentHealth = maximumHealth;
        }
    }

}