/********************************************************************************
 *	文件名：	ThreadList.cs
 *	全路径：	\Script\Player\AI\ThreadList.cs
 *	创建人：	李嘉
 *	创建时间：2013-11-19
 *
 *	功能说明： Obj仇恨列表
 *	          
 *	修改记录：
*********************************************************************************/

using System;
using System.Collections.Generic;
using Games.LogicObj;

namespace Games.AI_Logic
{
    public class ThreatInfo
    {
        public ThreatInfo(Obj_Character obj, int nValue)
        {
            ThreatObj = obj;
            ThreatValue = nValue;
        }

        // 威胁来源
        public Obj_Character ThreatObj { get; set; }

        // 威胁值
        public int ThreatValue { get; set; }
    }

    public class Threat
    {
        private readonly List<ThreatInfo> m_ThreatList;

        public Threat()
        {
            if (null == m_ThreatList) m_ThreatList = new List<ThreatInfo>();
        }

        public int GetThreatValue(Obj_Character obj)
        {
            var threatInfo = FindThreadInfo(obj);
            return threatInfo == null ? 0 : threatInfo.ThreatValue;
        }

        public ThreatInfo FindThreadInfo(Obj_Character obj)
        {
            ThreatInfo result = null;
            if (obj != null)
                result = m_ThreatList.Find(a => a.ThreatObj == obj);
            return result;
        }

        public Obj_Character FindMaxThreatObj()
        {
            ThreatInfo maxThreat = null;
            for (var i = 0; i < m_ThreatList.Count; ++i)
                if (null == maxThreat || maxThreat.ThreatValue < m_ThreatList[i].ThreatValue)
                    maxThreat = m_ThreatList[i];
            return maxThreat == null ? null : maxThreat.ThreatObj;
        }

        public void AddThreat(Obj_Character obj, int value)
        {
            if (null == obj)
                return;
            var info = FindThreadInfo(obj);
            if (null == info)
            {
                // 负数威胁值不保存，因此不创建
                if (value > 0)
                {
                    info = new ThreatInfo(obj, value);
                    m_ThreatList.Add(info);
                }
            }
            else
            {
                info.ThreatValue = Math.Max(0, info.ThreatValue + value);
            }
        }

        public void ResetAllThreat()
        {
            m_ThreatList.Clear();
        }

        public void ResetThreat(Obj_Character obj)
        {
            if (obj != null)
            {
                var index = m_ThreatList.FindIndex(a => a.ThreatObj == obj);
                if (index >= 0)
                    m_ThreatList.RemoveAt(index);
            }
        }
    }
}