// Assets/_Project/Scripts/Gameplay/BuilderSpells/FireballSpellDefinition.cs
using UnityEngine;
using TD.Core;

namespace TD.Gameplay.BuilderSpells
{
    /// <summary>
    /// Builder spell #1 — drop a fireball on a point, dealing direct damage to whatever's
    /// there plus splash damage to nearby enemies.
    /// </summary>
    /// <remarks>
    /// <see cref="BuilderSpellDefinition.TargetType"/> is <see cref="SpellTargetType.PointTarget"/>
    /// — the cast controller shows only a fixed-size reticule, even though
    /// <see cref="BuilderSpellDefinition.Radius"/> is still used internally here as the splash
    /// radius (0 = no splash, direct hit only).
    /// </remarks>
    [CreateAssetMenu(fileName = "FireballSpell", menuName = "TD/Builder Spells/Fireball")]
    public class FireballSpellDefinition : BuilderSpellDefinition
    {
        public override BuilderSpellKind Kind => BuilderSpellKind.Fireball;

        [Header("Impact VFX")]
        [Tooltip("Prefab spawned at the target point on a successful cast. Optional — leave empty for no visual.")]
        [SerializeField] private GameObject impactVfxPrefab;

        [Tooltip("Seconds before the spawned VFX instance is destroyed.")]
        [Min(0f)]
        [SerializeField] private float impactVfxLifetime = 2f;
        
        [Header("Fireball")]
        [Tooltip("Damage dealt to every enemy within Radius of the target point.")]
        [Min(0f)]
        public float Damage = 50f;

        public override bool ServerCast(ulong clientId, Vector3 targetPoint)
        {
            PlayerSlot owner = PlayerMatchState.SlotForClient(clientId);

            int count = Physics.OverlapSphereNonAlloc(
                targetPoint, Mathf.Max(Radius, 0.01f), s_overlapBuffer, enemyLayerMask);

            bool hitAny = false;
            for (int i = 0; i < count; i++)
            {
                var enemyHealth = s_overlapBuffer[i].GetComponent<EnemyHealth>();
                if (enemyHealth == null || enemyHealth.IsDead) continue;

                enemyHealth.TakeDamage(Damage, DamageType.Fire, owner);
                hitAny = true;
            }

            return hitAny;
        }

        public override void ClientPlayVfx(Vector3 targetPoint)
        {
            if (impactVfxPrefab != null)
                Destroy(Instantiate(impactVfxPrefab, targetPoint, Quaternion.identity), impactVfxLifetime);
        }
    }
}