using System;
using System.Collections.Generic;
using UnityEngine;

namespace Game
{
    public class SkillHitInfo
    {
        public AttackBehaviour SkillParam;
        public Vector3 HitDir;
        public int OwnerEntity;
        public int HitEntity;
        public float AttackRate;
        public float StunkRate;
        public string SkillId; //是否技能造成的伤害
        public bool IsBreak;
        public int HitIndex;
        public int HitCount;
        public float Rank;
        public bool Continue;
    }

    public class ClipAttack : TimelineClipBase
    {
        private AttackClip _mRealAsset;
        private readonly List<SkillHitInfo> _tempHitInfoList = new List<SkillHitInfo>();

        public override void OnEnter()
        {
            _mRealAsset = Asset as AttackClip;
        }

        public override void OnStay()
        {
            var param = _mRealAsset.template;
            var skill = Owner.skill;
            var castShape = param.Shape;
            var castDir = Util.IgnoreY(skill.CastDir);
            var rot = Quaternion.FromToRotation(Vector3.right, castDir);
            var castPos = rot * castShape.Offset + Owner.Pos();

            Util.DrawShape(castShape, castPos, castDir, Color.red);

            _tempHitInfoList.Clear();
            var (rankMin, rankMax) = (float.MaxValue, float.MinValue);
            Util.ForeachEnemies(Owner.Team(), target =>
            {
                //检测命中
                var isHit = UtilShape.IsOverlap(castShape, castPos, castDir, target.hp.HitBoxShape, target.Pos());
                if (!isHit) return;

                //排除重复命中
                var hitKey = new Tuple<int, int>(target.ID(), param.hitId);
                if (skill.HitSet.Contains(hitKey)) return;
                skill.HitSet.Add(hitKey);

                //计算结算顺序rank
                var rank = GetRank(param.hitOrderType, target, castPos, castDir);
                if (rank < rankMin) rankMin = rank;
                if (rank > rankMax) rankMax = rank;

                var skillHitInfo = new SkillHitInfo
                {
                    SkillParam = param,
                    AttackRate = 1,
                    StunkRate = 1,
                    OwnerEntity = Owner.ID(),
                    HitEntity = target.ID(),
                    HitDir = GetHitDir(param.hitDirType, target, castPos, castDir),
                    SkillId = skill.SkillId.Value,
                    IsBreak = true,
                    Rank = rank,
                };
                if (!string.IsNullOrEmpty(skillHitInfo.SkillId))
                {
                    var skillCfg = Util.GetSkillMasterConfigData(skillHitInfo.SkillId);
                    if (skillCfg != null)
                    {
                        var featureSkill = skillCfg.GetFeatureSkill();
                        skillHitInfo.AttackRate = featureSkill.AttackRate;
                        skillHitInfo.StunkRate = featureSkill.StunRate;
                    }
                }

                _tempHitInfoList.Add(skillHitInfo);
            });
            _tempHitInfoList.Sort((l, r) => l.Rank.CompareTo(r.Rank));
            var hitNum = _tempHitInfoList.Count;
            var rankGroup = 0;
            var rankRange = rankMax - rankMin; //rank范围大小
            var rankRangeEach = rankRange / GameConst.HitMaxSettle; //单个group的rank范围大小
            for (var i = 0; i < hitNum; i++)
            {
                var info = _tempHitInfoList[i];
                info.HitIndex = i;
                info.HitCount = hitNum;

                var rate = (info.Rank - rankMin) / rankRange;
                if (rate > rankGroup * rankRangeEach)
                {
                    rankGroup++;
                }
                else
                {
                    info.Continue = true;
                }

                skill.HitInfo.Enqueue(info);
                if (!info.SkillParam.isAoe)
                {
                    break;
                }
            }
        }

        private Vector3 GetHitDir(EHitDirType hitOrderType, GameEntity target, Vector3 castPos, Vector3 castDir)
        {
            var targetPos = target.Pos();
            var targetDir = targetPos - castPos;
            targetDir.y = 0;
            switch (hitOrderType)
            {
                case EHitDirType.Center:
                    //从中心到外围
                    return targetDir;
                case EHitDirType.Backward:
                    //从前往后
                    return -castDir;
                case EHitDirType.Forward:
                    //从后往前
                    return castDir;
                case EHitDirType.Clockwise:
                    //顺时针
                    return GetDirRot(targetDir, true);
                case EHitDirType.CounterClockwise:
                    //逆时针
                    return GetDirRot(targetDir, false);
                case EHitDirType.CenterForward:
                    //中心向前
                    return targetDir + castDir;
                case EHitDirType.ClockwiseForward:
                    //顺时针向前
                    return GetDirRot(targetDir, true) + castDir;
                case EHitDirType.CounterClockwiseForward:
                    //逆时针向前
                    return GetDirRot(targetDir, false) + castDir;
            }

            return targetDir;
        }

        private Vector3 GetDirRot(Vector3 targetDir, bool isClockwise)
        {
            var sub = (Owner.move.IsRight ? -1 : 1) * (isClockwise ? 1 : -1);
            return Vector3.Cross(targetDir, Vector3.up * sub).normalized;
        }

        private float GetRank(EHitOrderType hitOrderType, GameEntity target, Vector3 castPos, Vector3 castDir)
        {
            //小在前
            var targetPos = target.Pos();
            var targetDir = targetPos - castPos;
            switch (hitOrderType)
            {
                case EHitOrderType.Center:
                    //按距离
                    return Vector3.Distance(targetPos, castPos);
                case EHitOrderType.Backward:
                    //从前往后
                    return -Vector3.Dot(targetDir, castDir);
                case EHitOrderType.Forward:
                    //从后往前
                    return Vector3.Dot(targetDir, castDir);
                case EHitOrderType.Clockwise:
                    //顺时针
                    return -GetRankRot(castDir, targetDir);
                case EHitOrderType.CounterClockwise:
                    //逆时针
                    return GetRankRot(castDir, targetDir);
            }

            return 0;
        }

        private float GetRankRot(Vector3 castDir, Vector3 targetDir)
        {
            var rot = Quaternion.FromToRotation(-castDir, Vector3.right);
            return Util.Vec3ToRot(rot * targetDir) * (Owner.move.IsRight ? 1 : -1);
        }
    }
}