Unity health management component.

HealthManager.cs

using UnityEngine;
using System.Collections;

namespace Adnc.Combat {
	[System.Serializable]
	public class StatHealth {
		[Tooltip("Set health manually")]
		[SerializeField] int health;
		int healthMax;
		
		public int Health {
			get { return health; }
			set { health = Mathf.Max(Mathf.Min(value, healthMax), 0); }
		}

		public int HealthMax {
			get { return healthMax; }
			set { 
				healthMax = value;
				if (health > healthMax) health = healthMax;
			}
		}

		[Tooltip("Use a curve based on the player's level to determine health. Manually setting the number always takes priority over a curve.")]
		[SerializeField] AnimationCurve healthCurve;
		
		[Tooltip("How much health is healed per minute")]
		public int healthRegen;
		float healthRegenPool;
		
		[Tooltip("Alt to manually setting health regen (see health curve)")]
		[SerializeField] AnimationCurve healthRegenCurve;

		[Tooltip("Reduces the total damage taken by this number (min of 1)")]
		public int defense;

		[Tooltip("Alt to manually setting defense (see health curve)")]
		[SerializeField] AnimationCurve defenseCurve;

		[Tooltip("Doesn't die when reaching 0 health")]
		public bool immortal;

		[Tooltip("Never takes damage, still receives attacks")]
		public bool invulnerable;

		public void ReceiveHealth (int val) {
			health = Mathf.Min(val + health, healthMax);
		}

		public void RemoveHealth (int amount) {
			if (invulnerable) return;

			int damage = Mathf.Min(1, amount - defense);
			health = Mathf.Min(0, health - damage);
		}

		public bool IsDead () {
			if (immortal) {
				return false;
			}

			return health <= 0;
		}

		// Calculates, finalizes, and sets stat curves
		public void Setup () {
			if (healthCurve.length > 0 && health == 0) {
				healthMax = (int)healthCurve.Evaluate(Sm.exp.level);
				health = healthMax;
			} else {
				healthMax = health;
			}

			if (defenseCurve.length > 0 && defense == 0) {
				defense = (int)defenseCurve.Evaluate(Sm.exp.level);
			}

			if (healthRegenCurve.length > 0 && healthRegen == 0) {
				healthRegen = (int)healthRegenCurve.Evaluate(Sm.exp.level);
			}
		}

		// Makes health regen stat generate additional hitpoints over time
		// @NOTE Designed to be called in the update loop
		public void HealthRegen () {
			healthRegenPool += healthRegen / 60f * Time.deltaTime;
			
			if (healthRegenPool > 1f) {
				int addHealth = (int)Mathf.Floor(healthRegenPool);
				ReceiveHealth(addHealth);
				healthRegenPool -= addHealth;
			}
		}
	}
}