using AI;
using Base;
using Data;
using Item;
using Managers;
using Prefab;
using System;
using System.Collections.Generic;
using System.Linq;
using Parsing;
using UnityEngine;
using Utils;


namespace Entity
{
    /// <summary>
    /// 表示游戏中的实体类，继承自 MonoBehaviour 并实现 ITick 接口。
    /// </summary>
    public class Entity : MonoBehaviour, ITick
    {
        public ProgressBarPrefab healthBarPrefab;
        public EntityPrefab entityPrefab;
        public EntityDef entityDef;
        /// <summary>
        /// 手上拿着显示的贴图
        /// </summary>
        public GameObject weaponAnimator;

        public SpriteAnimator weaponItem;
        public SpriteAnimator weaponAttackAnimation;
        
        /// <summary>
        /// 人工智能行为树，定义实体的行为逻辑。
        /// </summary>
        public BehaviorTreeBase BehaviorTreeTree { get; private set; }

        // /// <summary>
        // /// 当前实体正在执行的任务。
        // /// </summary>
        // public JobBase currentJob;

        private Attributes _attribute;

        /// <summary>
        /// 实体的属性定义，包括生命值、攻击力、防御力等。
        /// </summary>
        public virtual Attributes AttributesNow
        {
            get { return _attribute ??= new Attributes(baseAttributes); }
            protected set => _attribute = value;
        }


        public virtual Attributes baseAttributes => defAttributes;
        private Attributes _defAttributes;
        public virtual Attributes defAttributes
        {
            get
            {
                return _defAttributes ??= entityDef == null ? new Attributes() : new Attributes(entityDef.attributes);
            }
        }

        private Vector3 _direction;
        /// <summary>
        /// 实体当前的移动方向。
        /// </summary>
        public Vector3 Direction
        {
            get => _direction;
            set
            {
                _direction = Mathf.Approximately(value.sqrMagnitude, 1) ? value : value.normalized;
                Orientation ori;
                if (Mathf.Abs(Direction.y) > Mathf.Abs(Direction.x))
                {
                    ori = Direction.y > 0 ? Orientation.Up : Orientation.Down;
                }
                else
                {
                    ori = Direction.x > 0 ? Orientation.Right : Orientation.Left;
                }
                SetBodyTexture(CurrentState, ori);
            }
        }

        public Vector3 attackDirection;

        /// <summary>
        /// 实体的身体部分，用于挂载动画和图像节点。
        /// </summary>
        public GameObject body;

        /// <summary>
        /// 实体所属的阵营或派系。
        /// </summary>
        public string affiliation;

        /// <summary>
        /// 表示实体是否可以被选择。
        /// </summary>
        public bool canSelect = true;
        

        public string currentDimensionId;

        public Vector2 Size => entityPrefab.outline.GetColliderSize();

        /// <summary>
        /// 表示实体是否由玩家控制。
        /// </summary>
        public bool PlayerControlled
        {
            set
            {
                if (value)
                {
                    BehaviorTreeTree?.Reset();
                    if (Program.Instance.FocusedEntity && Program.Instance.FocusedEntity != this)
                    {
                        Program.Instance.FocusedEntity.PlayerControlled = false;
                    }

                    Program.Instance.SetFocusedEntity(this);
                    gameObject.tag="Player";
                }
                else if (Program.Instance.FocusedEntity == this)
                {
                    Program.Instance.SetFocusedEntity(null);
                    gameObject.tag = "Untagged";
                }
            }
            get => Program.Instance.FocusedEntity == this;
        }


        public bool IsWalking => _walkingTimer > 0;

        /// <summary>
        /// 获取实体当前位置。
        /// </summary>
        public Vector3 Position => transform.position;

        /// <summary>
        /// 表示实体是否已经死亡（生命值小于等于零）。
        /// </summary>
        public bool IsDead => AttributesNow.health <= 0;

        public bool IsShowingHealthBarUI => _hitBarUIShowTimer > 0;
        public bool IsAttacking => _attackTimer > 0;
        private float _attackTimer;
        private float _attackDetectionTime;
        private WeaponResource currentAttackWeapon;

        
        /// <summary>
        /// 当实体死亡时触发的事件。
        /// 只在实体首次进入死亡状态时触发一次。
        /// </summary>
        public event Action<Entity> OnEntityDied;

        private bool _warning;
        
        /// <summary>
        /// 存储不同朝向下的身体节点对象。
        /// </summary>
        protected Dictionary<EntityState, Dictionary<Orientation, GameObject>> bodyNodes = new();

        /// <summary>
        /// 当前实体的朝向。
        /// </summary>
        public Orientation CurrentOrientation { get; private set; } = Orientation.Up;

        /// <summary>
        /// 当前实体的状态
        /// </summary>
        public EntityState CurrentState { get; private set; } = EntityState.Idle;

        public AudioSource Audio;

        public Vector3 moveTarget;
        private const float TargetReachThresholdSquared = 0.001f;
        public virtual bool OnTargetPoint
        {
            get
            {
                var offset = Position - moveTarget;
                var distanceSquared = offset.sqrMagnitude; 
                return distanceSquared <= TargetReachThresholdSquared;
            }
        }
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        

        [SerializeField] private float _hitBarUIShowTime = 5;
        private float _hitBarUIShowTimer;
        protected int _walkingTimer;

        private List<(Func<Entity, bool>,string)> _conditionalEvents=new();

        /// <summary>
        /// 初始化实体的基本属性和行为树。
        /// </summary>
        /// <param name="entityDefine">实体的定义数据。</param>
        public virtual void Init(EntityDef entityDefine)
        {
            AttributesNow = new Attributes(entityDefine.attributes);

            affiliation = entityDefine.affiliation?.defName;
            InitBody(entityDefine.drawingOrder);
            entityDef = entityDefine;
            
            BehaviorTreeTree = BehaviorTreeUtils.ConvertToAIBase(entityDefine.behaviorTree);
            BehaviorTreeTree?.Init(entityDefine.behaviorTree, this);
            HideHealthBar();
            InitWeaponAnimator();
            InitConditionalEvents(entityDefine.eventDef?.GetAllConditionalEvents());
        }

        protected virtual void InitWeaponAnimator()
        {
            if (weaponAnimator && weaponAnimator.transform.childCount > 0)
            {
                foreach (Transform child  in weaponAnimator.transform)
                {
                    Destroy(child.gameObject);
                }
            }

            var currentWeapon = GetCurrentWeapon();
            if (currentWeapon?.AttackAnimation == null)
                return;
            weaponItem=GameObjectCreate.SpriteAnimator(currentWeapon.Icon.ToArray(), weaponAnimator.transform);
            weaponItem.SetFPS(currentWeapon.FPS);
            weaponItem.gameObject.SetActive(true);
            
            weaponAttackAnimation = GameObjectCreate.SpriteAnimator(currentWeapon.AttackAnimation.ToArray(),
                weaponAnimator.transform);
            weaponAttackAnimation.SetFPS(currentWeapon.FPS);
            weaponAttackAnimation.gameObject.SetActive(false);
        }

        /// <summary>
        /// 初始化实体的身体部分，包括不同朝向下的绘图节点。
        /// </summary>
        /// <param name="drawingOrder">绘制顺序定义。</param>
        protected virtual void InitBody(DrawingOrderDef drawingOrder)
        {
            // 预缓存枚举值（避免每次循环重复调用 Enum.GetValues）
            var states = Enum.GetValues(typeof(EntityState)).Cast<EntityState>().ToList();
            states.Remove(EntityState.Death);
            
            var orientations = Enum.GetValues(typeof(Orientation)).Cast<Orientation>().ToArray();
            // 预初始化字典结构（减少内层循环的字典检查）
            foreach (var state in states)
            {
                bodyNodes.TryAdd(state, new Dictionary<Orientation, GameObject>());
            }

            // 主初始化逻辑
            foreach (var state in states)
            {
                var stateBodyNodes = bodyNodes[state];
                foreach (var orientation in orientations)
                {
                    // 获取节点定义（避免重复调用）
                    var nodeDef = drawingOrder.GetDrawNodeDef(state, orientation, out var original);
                    GameObject targetObj;
                    if (nodeDef == null)
                    {
                        if (PackagesImageManager.Instance.defaultSprite)
                        {
                            targetObj = Instantiate(GameObjectCreate.ImagePrefab.gameObject, body.transform);
                            targetObj.name = $"{state}_{orientation}_Default";
                            targetObj.transform.localPosition = Vector3.zero;
                            var imagePrefabCom = targetObj.GetComponent<ImagePrefab>();
                            if (imagePrefabCom)
                            {
                                imagePrefabCom.SetSprite(PackagesImageManager.Instance.defaultSprite);
                            }
                            else
                            {
                                Debug.LogWarning(
                                    $"InitBody: 默认ImagePrefab中无法获取ImagePrefab组件！状态: {state}, 朝向: {orientation}");
                                targetObj = new GameObject { name = $"{state}_{orientation}_Empty" };
                                targetObj.transform.SetParent(body.transform, false);
                            }
                        }
                        else
                        {
                            targetObj = new GameObject { name = $"{state}_{orientation}_Empty" };
                            targetObj.transform.SetParent(body.transform, false);
                        }
                    }
                    else
                    {
                        // 处理有效节点定义
                        if (original.HasValue && stateBodyNodes.TryGetValue(original.Value, out var reusedObj))
                        {
                            targetObj = reusedObj; // 复用已有对象
                        }
                        else
                        {
                            targetObj = GameObjectCreate.InitBodyPart(nodeDef, body); // 创建新对象
                        }
                    }

                    if (targetObj)
                    {
                        stateBodyNodes[orientation] = targetObj;
                    }
                    else
                    {
                        Debug.LogError($"InitBody: 无法为状态 {state}, 朝向 {orientation} 创建或找到有效的GameObject。");
                        stateBodyNodes[orientation] = new GameObject($"ErrorNode_{state}_{orientation}"); // 提供一个错误占位符
                        stateBodyNodes[orientation].transform.SetParent(body.transform, false);
                    }
                }
            }

            // 批量隐藏所有节点（使用字典值集合直接操作）
            foreach (var nodeDict in bodyNodes.Values)
            {
                foreach (var obj in nodeDict.Values)
                {
                    obj.SetActive(false);
                }
            }
            SetBodyTexture(EntityState.Idle, Orientation.Down); // 激活默认朝向
        }


        protected void InitConditionalEvents(ConditionalEvent[] conditionalEvents)
        {
            if(conditionalEvents==null)return;
            _conditionalEvents.Clear();
            foreach (var conditionalEvent in conditionalEvents)
            {
                var condition = ConditionDelegateFactory.CreateConditionDelegate(conditionalEvent.parameter,
                    typeof(Entity), typeof(ConditionFunctions));
                if(condition==null)continue;
                _conditionalEvents.Add((condition, conditionalEvent.defName));
            }
        }
        
        


        /// <summary>
        /// 更新实体的逻辑，包括玩家控制和自动行为。
        /// </summary>
        public virtual void Tick()
        {
            //行走动画切换
            if (_walkingTimer > 0)
            {
                _walkingTimer -= 1;
                if (_walkingTimer <= 0)
                {
                    SetBodyTexture(EntityState.Idle, CurrentOrientation);
                }
            }
            //行为控制
            if (PlayerControlled)
            {
                UpdatePlayerControls();
            }
            else
            {
                AutoBehave();
            }
            //血条显示
            if (IsShowingHealthBarUI)
            {
                _hitBarUIShowTimer -= Time.deltaTime;
                if (_hitBarUIShowTimer <= 0)
                {
                    HideHealthBar();
                }
            }
            //攻击控制
            if (_attackTimer > 0)
            {
                _attackTimer -= Time.deltaTime;
                if (currentAttackWeapon != null && _attackTimer <= _attackDetectionTime)
                {
                    if (currentAttackWeapon.Type == WeaponType.Melee)
                    {
                        ExecuteMeleeAttack(currentAttackWeapon);
                    }
                    else
                    {
                        ExecuteRangedAttack(currentAttackWeapon);
                    }

                    currentAttackWeapon = null;
                }

                if (_attackTimer <= 0)
                {

                    SetBodyTexture(EntityState.Idle, CurrentOrientation);
                }
            }
            //条件事件控制
            foreach (var conditionalEvent in _conditionalEvents)
            {
                if (conditionalEvent.Item1(this))
                {
                    EventManager.Instance.Action(conditionalEvent.Item2, this);
                }
            }
        }

        /// <summary>
        /// 尝试攻击目标实体。
        /// </summary>
        public virtual bool TryAttack() // 使用override允许子类重写
        {
            if (IsAttacking || IsDead) return false; // 死亡时无法攻击

            // 尝试获取当前武器
            var currentWeapon = GetCurrentWeapon();
            
            if (currentWeapon == null)
            {
                return false;
            }

            StartAttack(currentWeapon);
            return true;
        }

        private void StartAttack(WeaponResource weaponResource)
        {
            _attackTimer = weaponResource.AttackCooldown;
            _attackDetectionTime =Mathf.Max(0,weaponResource.AttackCooldown- weaponResource.AttackDetectionTime);
            currentAttackWeapon = weaponResource;
            
            if (weaponResource.AttackAnimationTime > 0)
            {
                TemporaryAnimationManager.Instance.GenerateTemporaryAnimation(
                    weaponResource.AttackAnimation.ToArray(), Position,transform, weaponResource.AttackAnimationTime,
                    weaponResource.FPS);
            }
            if (weaponResource.UseEntityAttackAnimation)
            {
                SetBodyTexture(
                    weaponResource.Type == WeaponType.Melee ? EntityState.MeleeAttack : EntityState.RangedAttack,
                    CurrentOrientation);
            }
            else
            {
                HideCurrentBodyTexture();
            }

        }


        public void SetBodyTexture(EntityState state, Orientation orientation)
        {
            if (state == CurrentState && orientation == CurrentOrientation)
                return;
            HideCurrentBodyTexture();
            if (IsAttacking && currentAttackWeapon is { UseEntityAttackAnimation: false })
                return;
            if (bodyNodes.TryGetValue(state, out var showStateNode))
            {
                if (showStateNode.TryGetValue(orientation, out var showNode))
                {
                    showNode.SetActive(true);
                }
            }

            CurrentState = state;
            CurrentOrientation = orientation;
        }

        public void HideCurrentBodyTexture()
        {
            if (!bodyNodes.TryGetValue(CurrentState, out var stateNode)) return;
            if (stateNode.TryGetValue(CurrentOrientation, out var node))
            {
                node.SetActive(false);
            }
        }

        /// <summary>
        /// 根据方向尝试移动实体，并避免超调目标点。
        /// </summary>
        public virtual void TryMove()
        {
            if (OnTargetPoint)
            {
                return; // 已到达目标点，无需进一步移动。
            }

            var currentPosition = Position; // 假设 Position 是获取当前位置的属性
            var targetDestination = moveTarget; // 假设 moveTarget 是目标位置字段
            var directionToTarget = targetDestination - currentPosition;
            // 逻辑修改1：计算平方距离，避免开方。
            var sqrDistanceToTarget = directionToTarget.sqrMagnitude;
            // 逻辑修改2：将到达目标点的判断改为使用平方距离，并包含等于阈值的情况，避免开方。
            if (sqrDistanceToTarget <= TargetReachThresholdSquared)
            {
                transform.position = targetDestination; // 假设 transform 是 Transform 组件
                return;
            }

            var maxMoveDistance = AttributesNow.moveSpeed * Time.deltaTime; // 假设 AttributesNow 是包含 moveSpeed 的属性
            // 逻辑修改4：计算最大移动距离的平方，用于后续与平方距离的比较，避免开方。
            var maxMoveDistanceSquared = maxMoveDistance * maxMoveDistance;
            Vector3 newPosition;
            bool willReachTargetThisFrame;
            // 逻辑修改5：直接比较平方距离来确定是否能到达目标，优化了之前的Mathf.Min和复杂判断。
            if (maxMoveDistanceSquared >= sqrDistanceToTarget)
            {
                newPosition = targetDestination; // 精确捕捉到目标点
                willReachTargetThisFrame = true;
            }
            else
            {
                newPosition = currentPosition + Direction * maxMoveDistance;
                willReachTargetThisFrame = false;
            }
            
            transform.position = newPosition;
            
            // 如果已到达目标，则不设置行走动画和重置计时器
            if (willReachTargetThisFrame) return;
            SetBodyTexture(EntityState.Walking, CurrentOrientation); // 假设 SetBodyTexture 是设置动画的方法
            _walkingTimer = 2; // 假设 _walkingTimer 是一个计时器
        }

        public virtual void Move()
        {
            transform.position += Direction * (AttributesNow.moveSpeed * Time.deltaTime);
            SetBodyTexture(EntityState.Walking, CurrentOrientation);
            _walkingTimer = 2;
        }
        /// <summary>
        /// 处理实体受到攻击的逻辑。
        /// </summary>
        /// <param name="from">攻击来源实体。</param>
        public virtual void OnHit(Entity from)
        {
            // MODIFIED: 收到攻击时触发回调
            if (IsDead) // 如果已经死亡，则不再处理伤害 nor 触发事件
            {
                return;
            }
            var hit = from.AttributesNow.attack - AttributesNow.defense;
            if (hit < 0)
                hit = from.AttributesNow.attack / 100;
            // 确保伤害不为负，最小为0
            hit = Mathf.Max(0, hit);
            AttributesNow.health -= hit;
            var wasFatal = IsDead; // 检查这次攻击是否导致实体死亡

            BehaviorTreeTree?.Reset();
            if (wasFatal)
            {
                OnEntityDied?.Invoke(this);
            }

            if (Setting.Instance.CurrentSettings.showHealthBarByHit)
            {
                ShowHealthBar();
            }

            if (Setting.Instance.CurrentSettings.showHitNumber)
            {
                TemporaryAnimationManager.Instance.GenerateTemporaryAnimation(hit.ToString(), Position);
            }
        }

        public void ShowHealthBar()
        {
            if (!healthBarPrefab)
                return;
            healthBarPrefab.gameObject.SetActive(true);
            healthBarPrefab.Progress = (float)AttributesNow.health / entityDef.attributes.health;
            _hitBarUIShowTimer = _hitBarUIShowTime;
        }

        public void HideHealthBar()
        {
            if (!healthBarPrefab)
                return;
            healthBarPrefab.gameObject.SetActive(false);
        }

        /// <summary>
        /// 杀死实体，设置生命值为零。
        /// </summary>
        public virtual void Kill()
        {
            if (IsDead)
            {
                return;
            }

            AttributesNow.health = 0; // 直接设置生命值为0
            BehaviorTreeTree?.Reset();
            // 触发 OnEntityDied 事件
            OnEntityDied?.Invoke(this);
            ShowHealthBar();
        }

        /// <summary>
        /// 设置实体的目标位置。
        /// </summary>
        /// <param name="pos">目标位置。</param>
        public virtual void SetTarget(Vector3 pos)
        {
            Direction = (pos - transform.position).normalized;
            moveTarget = pos;
            if (!PlayerControlled)
            {
                attackDirection=Direction;
            }
        }

        /// <summary>
        /// 自动行为逻辑，根据行为树执行任务。
        /// </summary>
        protected virtual void AutoBehave()
        {
            var result=BehaviorTreeTree?.Tick();
        }


        /// <summary>
        /// 更新玩家控制的逻辑，处理输入和移动。
        /// </summary>
        protected virtual void UpdatePlayerControls()
        {
            if (Input.GetMouseButton(0))
            {
                var mousePos = MousePosition.GetWorldPosition();
                attackDirection = new Vector3(mousePos.x, mousePos.y) - Position;
                if (weaponItem)
                {
                    var angle= RotateTool.RotateTransformToDirection(weaponItem.transform, attackDirection);
                    weaponItem.Flip(false,angle is > 90 or <= -90);
                }
            }

            if (Input.GetKeyDown(KeyCode.V))
            {
                weaponItem.gameObject.SetActive(!weaponItem.gameObject.activeSelf);
            }
            // 获取当前键盘输入状态（2D 移动，只使用 X 和 Y 轴）
            var inputDirection = Vector2.zero;

            // 检测 WASD 或方向键输入
            if (Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow))
            {
                inputDirection += Vector2.up; // 向上移动（Y 轴正方向）
            }

            if (Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.DownArrow))
            {
                inputDirection += Vector2.down; // 向下移动（Y 轴负方向）
            }

            if (Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.LeftArrow))
            {
                inputDirection += Vector2.left; // 向左移动（X 轴负方向）
            }

            if (Input.GetKey(KeyCode.D) || Input.GetKey(KeyCode.RightArrow))
            {
                inputDirection += Vector2.right; // 向右移动（X 轴正方向）
            }

            if (Input.GetMouseButton(0))
            {
                TryAttack();
            }
            // 如果有输入方向，则设置目标位置并尝试移动
            if (inputDirection == Vector2.zero) return;
            // 归一化方向向量，确保对角线移动速度一致
            inputDirection = inputDirection.normalized;

            Direction = new Vector3(inputDirection.x, inputDirection.y, 0);
            Move();

        }

        
        private void ExecuteMeleeAttack(WeaponResource weapon)
        {
            if (weapon.Attributes == null)
            {
                Debug.LogWarning($"武器 {weapon.DefName} 没有定义Attributes，无法执行近战攻击。");
                return;
            }

            var attackRange = weapon.Attributes.attackRange;
            var attackTargetCount = weapon.Attributes.attackTargetCount;

            var hits = Physics2D.OverlapCircleAll(
                transform.position,
                attackRange,
                LayerMask.GetMask("Entity"));

            foreach (var hit in hits)
            {
                if (attackTargetCount <= 0) break; // 已达到最大攻击目标数
                if (hit.gameObject == gameObject) continue; // 不攻击自己

                var entity = hit.GetComponent<Entity>();
                if (entity != null && entity.affiliation != affiliation) // 确保是敌对实体
                {
                    entity.OnHit(this); // 攻击时将自身作为攻击来源
                    attackTargetCount--;
                }
            }
        }

        // NEW: 辅助方法用于执行远程攻击
        private void ExecuteRangedAttack(WeaponResource weapon)
        {
            if (weapon.Bullet == null)
            {
                Debug.LogWarning($"远程武器 {weapon.DefName} 没有定义Bullet，无法发射子弹。");
                return;
            }

            // 获取子弹方向。这里使用实体当前的移动方向作为子弹发射方向
            // 更复杂的逻辑可能根据鼠标位置、目标位置等确定
            var bulletDirection = attackDirection; // 实体当前的朝向

            // 如果没有明确的方向，给一个默认值以防万一
            if (bulletDirection == Vector3.zero) bulletDirection = Vector3.down;


            // 假设 EntityManage.Instance.GenerateBulletEntity 方法存在
            // (需要一个 EntityManage 单例来实现子弹生成)
            if (EntityManager.Instance != null && Program.Instance != null)
            {
                EntityManager.Instance.GenerateBulletEntity(
                    Program.Instance.FocusedDimensionId,
                    weapon.Bullet,
                    transform.position, // 子弹的生成位置
                    bulletDirection, // 子弹的初始方向
                    this); // 子弹的发射者
            }
            else
            {
                Debug.LogError("EntityManage.Instance 或 Program.Instance 为空，无法生成子弹。请确保它们已正确初始化。");
            }
        }


        public virtual WeaponResource GetCurrentWeapon()
        {
            return null;
        }

        public void ExecuteEvent(EntityEventType type)
        {
            var eventDefs = entityDef?.eventDef?.GetEventsByType(type);
            if (eventDefs == null || eventDefs.Length == 0) return;
            foreach (var eventDef in eventDefs)
            {
                EventManager.Instance.Action(eventDef,this);
            }
        }
    }
}