OTG_8/Assets/_Scripts/Abilities/FireballEffect.cs

using OTGIntegrated.Combat;
using UnityEngine;

namespace OTGIntegrated.Abilities
{
    [RequireComponent(typeof(Collider))]
    public sealed class FireballEffect : AbilityEffect
    {
        public float speed = 16f;
        public float radius = 0.35f;
        public LayerMask hitMask = ~0;

        private AbilityContext context;
        private Vector3 direction;
        private float remainingLife;
        private bool active;

        private void Awake()
        {
            Collider ownCollider = GetComponent<Collider>();
            ownCollider.isTrigger = true;
        }

        public override void Activate(AbilityContext context)
        {
            this.context = context;
            direction = context.Forward;
            remainingLife = Mathf.Max(0.5f, context.Ability.range / Mathf.Max(1f, speed));
            active = true;
            transform.position = context.Origin + direction * 0.9f;
            transform.rotation = Quaternion.LookRotation(direction, Vector3.up);
        }

        private void Update()
        {
            if (!active)
            {
                return;
            }

            float step = speed * Time.deltaTime;
            if (Physics.SphereCast(transform.position, radius, direction, out RaycastHit hit, step, hitMask, QueryTriggerInteraction.Ignore))
            {
                ApplyHit(hit.collider);
                return;
            }

            transform.position += direction * step;
            remainingLife -= Time.deltaTime;
            if (remainingLife <= 0f)
            {
                Destroy(gameObject);
            }
        }

        private void OnTriggerEnter(Collider other)
        {
            if (active)
            {
                ApplyHit(other);
            }
        }

        private void ApplyHit(Collider hitCollider)
        {
            if (hitCollider == null || context.Caster == null || hitCollider.transform == context.Caster || hitCollider.GetComponentInParent<AbilityEffect>() != null)
            {
                return;
            }

            Damageable damageable = hitCollider.GetComponentInParent<Damageable>();
            if (damageable != null && damageable.IsAlive)
            {
                float finalDamage = context.Ability.damage + (context.Stats != null ? context.Stats.Damage : 0f);
                damageable.TakeDamage(finalDamage, context.Caster.gameObject);
            }

            Destroy(gameObject);
        }
    }
}