using System;
using UnityEngine;
using BaseGames.Combat;
using BaseGames.Core.Events;

namespace BaseGames.Equipment
{
    /// <summary>
    /// 命中触发效果类型。
    /// </summary>
    public enum OnHitEffectType
    {
        ApplyPoison,
        ApplyFire,
        KnockbackBoost
    }

    /// <summary>
    /// 命中触发护符效果（架构 09_ProgressionModule §5）。
    /// 订阅 HitConfirmedEventChannelSO("EVT_HitConfirmed") 并按概率对命中目标施加状态效果。
    /// KnockbackBoost 类型通过 DamageInfo.KnockbackForce 标记，由 HurtBox 流水线读取。
    /// </summary>
    [Serializable]
    public class OnHitEffect : ICharmEffect
    {
        public OnHitEffectType effectType;
        [Range(0f, 1f)]
        public float           chance;        // 触发概率（0~1）

        private HitConfirmedEventChannelSO _onHitChannel;
        private EventSubscription          _sub;

        public void OnEquip(EquipmentContext ctx)
        {
            _onHitChannel = ctx.Events?.Get<HitConfirmedEventChannelSO>("EVT_HitConfirmed");
            _sub = _onHitChannel?.Subscribe(HandleHit);
        }

        public void OnUnequip(EquipmentContext ctx)
        {
            _sub?.Dispose();
            _sub          = null;
            _onHitChannel = null;
        }

        private void HandleHit(HitInfo info)
        {
            if (UnityEngine.Random.value > chance) return;

            switch (effectType)
            {
                case OnHitEffectType.ApplyPoison:
                    info.HitTransform?.GetComponentInParent<IStatusEffectable>()
                        ?.ApplyStatusEffect(DamageType.Poison);
                    break;
                case OnHitEffectType.ApplyFire:
                    info.HitTransform?.GetComponentInParent<IStatusEffectable>()
                        ?.ApplyStatusEffect(DamageType.Fire);
                    break;
                case OnHitEffectType.KnockbackBoost:
                    // KnockbackBoost 在 HitBox 构建 DamageInfo 前生效，
                    // 此处为命中后的反馈（可在此播放特效；实际击退已在 HurtBox 流水线处理）。
                    break;
            }
        }

        public string GetEffectDescription() => $"命中时 {chance * 100:0}% 概率附加 {effectType}";
    }
}