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; //0为非实体对象
        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 class ClipAttack : TimelineClipBase
    {
        private AttackClip _mRealAsset;
        private List<GameEntity> _tempTargetList = new List<GameEntity>();

        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 = skill.CastDir;
            castDir = new Vector3(castDir.x, 0, castDir.z); //忽略y
            var rot = Quaternion.FromToRotation(Vector3.right, castDir);
            var castPos = rot * castShape.Offset + Owner.Pos();

            Util.DrawShape(castShape, castPos, castDir, Color.red);
            _tempTargetList.Clear();
            Util.ForeachEnemies(Owner.Team(), target =>
            {
                var isHit = UtilShape.IsOverlap(castShape, castPos, castDir, target.hp.HitBoxShape, target.Pos());
                if (!isHit) return;

                var hitKey = new Tuple<int, int>(target.ID(), param.hitId);
                if (skill.HitSet.Contains(hitKey)) return;
                skill.HitSet.Add(hitKey);

                _tempTargetList.Add(target);
            });
            _tempTargetList.Sort((l, r) =>
            {
                var lRank = GetRank(param.hitDirType, l, castPos, castDir);
                var rRank = GetRank(param.hitDirType, r, castPos, castDir);
                return lRank.CompareTo(rRank);
            });
            var hitNum = _tempTargetList.Count;
            for (var i = 0; i < hitNum; i++)
            {
                var target = _tempTargetList[i];
                var targetID = target.ID();
                var skillHitInfo = new SkillHitInfo
                {
                    SkillParam = param,
                    AttackRate = 1,
                    StunkRate = 1,
                    OwnerEntity = Owner.ID(),
                    HitEntity = targetID,
                    HitDir = GetHitDir(param.hitDirType, target, castPos, castDir),
                    SkillId = skill.SkillId.Value,
                    IsBreak = true,
                    hitIndex = i,
                    hitCount = hitNum
                };
                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;
                    }
                }

                skill.HitInfo.Enqueue(skillHitInfo);
            }
        }

        private Vector3 GetHitDir(EHitDirType hitDirType, GameEntity target, Vector3 castPos, Vector3 castDir)
        {
            var targetPos = target.Pos();
            var targetDir = targetPos - castPos;
            switch (hitDirType)
            {
                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 Vector3.Cross(targetDir, Vector3.down * (Owner.move.IsRight ? 1 : -1));
                case EHitDirType.CounterClockwise:
                    //逆时针
                    return Vector3.Cross(targetDir, Vector3.up * (Owner.move.IsRight ? 1 : -1));
            }

            return targetDir;
        }

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