Health.cs

using System;
using UnityEngine;

public class Health: MonoBehaviour {
    public event Action OnDamage;
    public event Action OnDied;

    static GameObject poofParticlesPrefab {
        get {
            if (_poofParticlesPrefab == null) {
                _poofParticlesPrefab = Resources.Load<GameObject>("Poof-particles");
            }
            return _poofParticlesPrefab;
        }
    }
    static GameObject _poofParticlesPrefab;
    [SerializeField] EntityType entityType;
    Collider hitbox;
    Animator animator;
    const string animDieTrigger = "Die";
    public bool Dead { get; private set; }
    const float invulnerableTime = 0.2f;
    public float DeathDelay { get; set;} = 0.9f;
    bool invulnerable = false;
    AudioSource audioSource;
    /// <summary>
    /// SET ON AWAKE, ACCESS AT START OR LATER.
    /// </summary>
    public int HP {get ; private set;}
    public void SetHealth(int health) {
        HP = health;
    }

    void Awake() {
        animator = GetComponent<Animator>();
        if (TryGetComponent<AudioSource>(out var source)) {
            audioSource = source;
        } else {
            audioSource = gameObject.AddComponent<AudioSource>();
        }
        hitbox = GetComponent<Collider>();
    }

    // Entrypoint for getting damaged
    void OnTriggerEnter(Collider other) {
        if (Dead) return;
        if (other.TryGetComponent<Weapon>(out var weapon)) {
            if (weapon.entityType != entityType)
                Damage();
        }
    }

    void Damage() {
        if (Dead) return;
        if (invulnerable) return;
        if (entityType == EntityType.Player && Player.I.Dodging) return;

        invulnerable = true;
        new Timeout(() => invulnerable = false, invulnerableTime, this);
        HP--;
        OnDamage?.Invoke();
        Sound.PlayClip(audioSource, SoundEffects.I.Damage);
        if (HP <= 0) Die();
    }

    void Die() {
        if (Dead) return;
        OnDied?.Invoke();
        if (hitbox != null) {
            hitbox.enabled = false;
        }
        Dead = true;
        animator.SetTrigger(animDieTrigger);
        var poof = Instantiate(poofParticlesPrefab, transform.position, Quaternion.identity);
        new Timeout(() => {
            poof.GetComponent<ParticleSystem>().Play();
            Destroy(poof, 1f);
        }, DeathDelay);
        
        if (entityType == EntityType.Enemy) {
            Destroy(gameObject, DeathDelay);
        }

        if (entityType == EntityType.Player) {
            new Timeout(() => Sound.PlayClipUniversal(SoundEffects.I.Defeat), 1f);
        }
    }
}