using System.Collections.Generic;

using UnityEngine;

using Colosseum.Combat;
using Colosseum.Enemy;

namespace Colosseum.Skills.Effects
{
    /// <summary>
    /// 주변 적의 위협 수치를 높여 주 대상을 자신에게 돌리는 도발 효과입니다.
    /// 필요 시 시전자에게 임시 위협 생성 배율도 함께 부여합니다.
    /// </summary>
    [CreateAssetMenu(fileName = "TauntEffect", menuName = "Colosseum/Skills/Effects/Taunt")]
    public class TauntEffect : SkillEffect
    {
        [Header("Taunt Settings")]
        [Tooltip("도발 시 추가할 기본 위협 수치")]
        [Min(0f)] [SerializeField] private float flatThreatAmount = 50f;

        [Tooltip("현재 최고 위협보다 이 값만큼 더 높게 설정합니다.")]
        [Min(0f)] [SerializeField] private float threatLeadBonus = 10f;

        [Tooltip("도발과 함께 시전자에게 부여할 위협 생성 배율")]
        [Min(0f)] [SerializeField] private float selfThreatMultiplier = 1.5f;

        [Tooltip("위협 생성 배율 지속 시간")]
        [Min(0f)] [SerializeField] private float selfThreatMultiplierDuration = 5f;

        private readonly Collider[] overlapBuffer = new Collider[16];
        private readonly HashSet<EnemyBase> processedEnemies = new HashSet<EnemyBase>();

        protected override void ApplyEffect(GameObject caster, GameObject target)
        {
            if (caster == null)
                return;

            ApplySelfThreatMultiplier(caster);

            processedEnemies.Clear();
            int hitCount = Physics.OverlapSphereNonAlloc(caster.transform.position, areaRadius, overlapBuffer, targetLayers);
            for (int i = 0; i < hitCount; i++)
            {
                Collider hit = overlapBuffer[i];
                if (hit == null)
                    continue;

                EnemyBase enemy = hit.GetComponentInParent<EnemyBase>();
                if (enemy == null || processedEnemies.Contains(enemy))
                    continue;

                if (!IsValidTarget(caster, enemy.gameObject))
                    continue;

                processedEnemies.Add(enemy);
                ApplyTauntThreat(enemy, caster);
            }
        }

        private void ApplySelfThreatMultiplier(GameObject caster)
        {
            if (selfThreatMultiplier <= 0f || selfThreatMultiplierDuration <= 0f)
                return;

            ThreatController threatController = caster.GetComponent<ThreatController>();
            if (threatController == null)
            {
                threatController = caster.AddComponent<ThreatController>();
            }

            threatController.ApplyThreatMultiplier(selfThreatMultiplier, selfThreatMultiplierDuration);
        }

        private void ApplyTauntThreat(EnemyBase enemy, GameObject caster)
        {
            if (enemy == null || caster == null || !enemy.UseThreatSystem)
                return;

            GameObject highestThreatTarget = enemy.GetHighestThreatTarget();
            float highestThreat = highestThreatTarget != null ? enemy.GetThreat(highestThreatTarget) : 0f;
            float currentCasterThreat = enemy.GetThreat(caster);

            float desiredThreat = Mathf.Max(currentCasterThreat + flatThreatAmount, highestThreat + threatLeadBonus + flatThreatAmount);
            enemy.SetThreat(caster, desiredThreat);
        }
    }
}