using CommonAI.Data;
using CommonAI.Zone.Formula;
using CommonAI.Zone.Helper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using XmdsCommon.Plugin;
using XmdsCommonServer.Plugin;
using XmdsCommonServer.Plugin.XmdsSkillTemplate.DamageCalculator;
using XmdsCommonServer.Plugin.XmdsSkillTemplate.Skills;

namespace XmdsCommonSkill.Plugin.Buffs
{
    /// <summary> 
    /// Description: 用于改变技能伤害.
    /// DateTime: 2019/6/17 16:32:21
    /// </summary>

    public class XmdsBuff_SkillDamageChange : XmdsBuffBase
    {
        /// BUFF作用效果.正：增加伤害，负：减少伤害.
        public float BuffChangeValue = 0;
		public int maxOverlayer = 0;

        //针对的技能类型，
        public XmdsSkillType validType;

        /// 大于0，则只影响对应的技能效果.
        public int TargetSkillID = 0;

		//默认时间.
		private const int DefaultTime = int.MaxValue;

		//当前作用效果.
		private float CurrentChangeValue = 0;

		private int mHandUUID = 0;

		public override int GetAbilityID()
        {
            return (int)XmdsBuffProperties.XmdsBuffAbility.SkillDamageChange;
        }

		public override void CopyTo(UnitBuff other)
		{
			var ret = other as XmdsBuff_SkillDamageChange;

			ret.BuffChangeValue = this.BuffChangeValue;
			ret.maxOverlayer = this.maxOverlayer;
			
			ret.validType = this.validType;
			ret.TargetSkillID = this.TargetSkillID;


			base.CopyTo(other);
		}

		protected override void OnBindTemplate(ref CommonAI.Zone.BuffTemplate buffTemplate)
        {
            //如果为次数型，那么需设置作用时间.
            if (BuffUseType == (int)XmdsBuffBase.XmdsBuffUseType.Times)
            {
                buffTemplate.LifeTimeMS = DefaultTime;
            }
        }

        protected override void OnBuffBegin(XmdsCommonServer.Plugin.XmdsVirtual hitter, XmdsCommonServer.Plugin.XmdsVirtual attacker, CommonAI.Zone.Instance.InstanceUnit.BuffState state)
        {
            CurrentChangeValue = Math.Max(state.OverlayLevel + 1, this.maxOverlayer) * BuffChangeValue;

            mHandUUID = hitter.RegistOnHitOther(OnHandleHitOther, null);
        }

        protected override void OnBuffEnd(XmdsCommonServer.Plugin.XmdsVirtual hitter, CommonAI.Zone.Instance.InstanceUnit.BuffState state, bool replace)
        {
            CurrentChangeValue = Math.Min(state.OverlayLevel + 1, this.maxOverlayer) * BuffChangeValue;
            hitter.UnRegistOnHitOther(mHandUUID);
        }

		private float OnHandleHitOther(float damage, XmdsVirtual hitter, XmdsVirtual attacker, AttackSource source, 
            ref XmdsVirtual.AtkResult result, DamageType damageType, GameSkill skill, ref bool isEndDispatch)
		{
			if (IsInvaild() == true) { return damage; }

            //GameSkill skill = attacker.SkillHelper.GetGameSkill(((source.Attack.Properties) as XmdsAttackProperties).SkillTemplateID);
            if(source.FromSkillType == XmdsSkillType.normalAtk)
            {
                return damage;
            }

            //大于0代表制定了影响的技能，如果ID与指定ID不匹配，则不影响.
            XmdsAttackProperties p = (XmdsAttackProperties)source.Attack.Properties;
			if (TargetSkillID > 0 && TargetSkillID != p.SkillTemplateID)
			{
				return damage;
			}

			damage = damage * (CurrentChangeValue + XmdsDamageCalculator.PERER) / XmdsDamageCalculator.PERER;
			if (BuffInvaildCheck())
			{
				attacker.mUnit.removeBuff(BindBuffID);
			}

			return damage;
		}
    }
}