using System;
using System.Collections.Generic;
using Cielonos.MainGame.Buffs.Character;
using Cielonos.MainGame.Characters;
using SLSUtilities.General;
using SLSUtilities.WwiseAssistance;

namespace Cielonos.MainGame.Inventory.Collections
{
    /// <summary>
    /// 衰变传播器 / Decay Propagator
    /// Fusion 引爆时，将 Decay 扩散到引爆范围内的其他敌人。
    /// </summary>
    public class DecayPropagator : PassiveEquipmentBase
    {
        private const string EventKey = nameof(DecayPropagator);

        public override void OnObtained()
        {
            base.OnObtained();
            Action<CharacterBuffBase> onApplyBuff = OnApplyBuffToOther;
            player.eventSm.onApplyBuffToTarget.Add(EventKey, onApplyBuff.ToPrioritized());
        }

        public override void OnDiscarded()
        {
            player.eventSm.onApplyBuffToTarget.Remove(EventKey);
            base.OnDiscarded();
        }
        
        /// <summary>
        /// 在 Fusion 被应用到目标时，注册一个事件监听器，当 Fusion 引爆时触发 SpreadDecay 方法。
        /// </summary>
        private void OnApplyBuffToOther(CharacterBuffBase buff)
        {
            if (buff is not Fusion fusion) return;
            fusion.onExploded.TryAdd(EventKey, new PrioritizedAction<Fusion, AttackAreaBase>(SpreadDecay));
        }

        /// <summary>
        /// 当 Fusion 引爆时，获取引爆范围内的所有敌人，并对它们应用 Decay 效果。
        /// </summary>
        private void SpreadDecay(Fusion fusion, AttackAreaBase attackArea)
        {
            CharacterBase target = fusion.attachedCharacter;
            List<Enemy> affectedTargets = CombatManager.EnemySm.GetEnemiesInRadius(target.centerPosition, 10f);
            float decayDamage = passiveAttributeSm.GetItemAttribute("DecayDamage");
            affectedTargets.ForEach(t => new Decay(decayDamage).Apply(t));
        }
    }
}