using System;
using System.Collections;
using System.Collections.Generic;
using AI;
using Base;
using Data;
using Prefab;
using UnityEngine;
using UnityEngine.Serialization;


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
    {
        /// <summary>
        /// 动画预制体，用于管理实体的动画逻辑。
        /// </summary>
        public SpriteAnimator animatorPrefab;

        /// <summary>
        /// 图像预制体，用于管理实体的静态图像显示。
        /// </summary>
        public ImagePrefab imagePrefab;

        public ProgressBarPrefab healthBarPrefab;
        
        
        /// <summary>
        /// 人工智能行为树，定义实体的行为逻辑。
        /// </summary>
        public AIBase aiTree;

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

        /// <summary>
        /// 实体的属性定义，包括生命值、攻击力、防御力等。
        /// </summary>
        public AttributesDef attributes = new();

        /// <summary>
        /// 实体当前的移动方向。
        /// </summary>
        public Vector3 direction;

        /// <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;

        /// <summary>
        /// 表示实体是否处于追逐状态（影响移动速度）。
        /// </summary>
        public bool IsChase { set; get; } = true;
        
        
        

        /// <summary>
        /// 表示实体是否由玩家控制。
        /// </summary>
        public bool PlayerControlled
        {
            set
            {
                if (value)
                {
                    IsChase = true;
                    currentJob = null;
                }
                _isPlayerControlled = value;
            }
            get => _isPlayerControlled;
        }

        /// <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 => attributes.health <= 0;
        public bool IsShowingOfHitBarUI=>hitBarUIShowTimer > 0;
        public bool IsAttacking => attackCoroutine != null;
        
        
        private bool _isPlayerControlled = false;
        private bool _warning = false;

        /// <summary>
        /// 存储不同朝向下的动画节点集合。
        /// </summary>
        public Dictionary<Orientation, List<ITick>> bodyAnimationNode = new();

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

        /// <summary>
        /// 当前实体的朝向。
        /// </summary>
        private Orientation currentOrientation = Orientation.Down;
        
        
        
        /// <summary>
        /// 攻击动画的持续时间（秒）。
        /// </summary>
        private const float attackAnimationDuration = 0.1f;

        /// <summary>
        /// 抖动的偏移量。
        /// </summary>
        private const float shakeOffset = 0.5f;
        // 协程引用
        private Coroutine attackCoroutine;

        protected EntityDef entityDef;


        public float hitBarUIShowTime = 5;
        private float hitBarUIShowTimer = 0;


        /// <summary>
        /// 初始化实体的基本属性和行为树。
        /// </summary>
        /// <param name="entityDef">实体的定义数据。</param>
        public virtual void Init(EntityDef entityDef)
        {
            attributes = entityDef.attributes.Clone();
            aiTree = Utils.BehaviorTree.ConvertToAIBase(entityDef.behaviorTree);
            affiliation = entityDef.affiliation;
            InitBody(entityDef.drawingOrder);
            this.entityDef = entityDef;
            
            HideHealthBar();
        }

        /// <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>
        public virtual void InitBody(DrawingOrderDef drawingOrder)
        {
            // 定义方向枚举和对应的 GetDrawingOrder 调用
            Orientation[] orientations = { Orientation.Down, Orientation.Up, Orientation.Left, Orientation.Right };

            foreach (var orientation in orientations)
            {
                currentOrientation = orientation;
                bodyAnimationNode[orientation] = new();
                // 获取当前方向的绘图节点
                var drawNode = drawingOrder.GetDrawingOrder(orientation, out var realOrientation);

                if (drawNode == null) continue;
                var directionRoot = new GameObject(orientation.ToString());
                directionRoot.transform.SetParent(body.transform, false);
                InitBodyPart(drawNode, directionRoot, drawingOrder.texturePath,realOrientation);
                bodyNodes[orientation] = directionRoot;
            }
            currentOrientation = Orientation.Down;

            foreach (var bodyNode in bodyNodes)
            {
                bodyNode.Value.SetActive(false);
            }
            SetOrientation(Orientation.Down);
        }

        /// <summary>
        /// 递归初始化单个绘图节点及其子节点。
        /// </summary>
        /// <param name="drawNode">绘图节点定义。</param>
        /// <param name="parent">父节点对象。</param>
        /// <param name="folderPath">纹理资源路径。</param>
        public virtual void InitBodyPart(DrawNodeDef drawNode, GameObject parent, string folderPath,Orientation realOrientation)
        {
            if (drawNode == null) return;

            GameObject nodeObject;
            if (drawNode.nodeName == "noName")
            {
                nodeObject = new();
                nodeObject.transform.SetParent(parent.transform);
            }
            else
            {
                switch (drawNode.drawNodeType)
                {
                    case DrawNodeType.Image:
                        nodeObject = Instantiate(imagePrefab.gameObject, parent.transform);
                        var texture =
                            Managers.PackagesImageManager.Instance.FindBodyTextures(drawNode.packID, folderPath,
                                $"{drawNode.nodeName}_{realOrientation}");
                        var image = nodeObject.GetComponent<ImagePrefab>();
                        image.SetSprite(texture.Length > 0
                            ? texture[0]
                            : Managers.PackagesImageManager.Instance.defaultSprite);
                        break;

                    case DrawNodeType.Animation:
                        nodeObject = Instantiate(animatorPrefab.gameObject, parent.transform);
                        ITick tick = nodeObject.GetComponent<SpriteAnimator>();
                        if (tick != null)
                            bodyAnimationNode[currentOrientation].Add(tick);
                        var textures = Managers.PackagesImageManager.Instance.FindBodyTextures(drawNode.packID,
                            folderPath,
                            $"{drawNode.nodeName}_{realOrientation}");
                        var animator = nodeObject.GetComponent<SpriteAnimator>();
                        animator.SetSprites(textures);
                        break;
                    default:
                        throw new ArgumentOutOfRangeException();
                }
            }
            nodeObject.transform.localPosition = drawNode.position;
            nodeObject.name = drawNode.nodeName;
            // 递归初始化子节点
            foreach (var child in drawNode.children)
            {
                InitBodyPart(child, nodeObject, folderPath,realOrientation);
            }
        }

        /// <summary>
        /// 更新实体的逻辑，包括玩家控制和自动行为。
        /// </summary>
        public void Tick()
        {
            if (_isPlayerControlled)
            {
                UpdatePlayerControls();
            }
            else
            {
                AutoBehave();
            }
            if (bodyAnimationNode.TryGetValue(currentOrientation, out var ticks))
            {
                foreach (var tick in ticks)
                {
                    tick.Tick();
                }
            }

            if (IsShowingOfHitBarUI)
            {
                hitBarUIShowTimer -= Time.deltaTime;
                if (hitBarUIShowTimer <= 0)
                {
                    HideHealthBar();
                }
            }
        }

        /// <summary>
        /// 尝试攻击目标实体。
        /// </summary>
        public virtual void TryAttack()
        {
            if(!IsAttacking)
                attackCoroutine = StartCoroutine(AttackFlow());
        }

        /// <summary>
        /// 设置实体的朝向。
        /// </summary>
        /// <param name="orientation">新的朝向。</param>
        public virtual void SetOrientation(Orientation orientation)
        {
            // 禁用当前朝向的节点
            if (bodyNodes.TryGetValue(currentOrientation, out var currentNode))
            {
                currentNode.SetActive(false);
            }
            // 设置新的朝向
            currentOrientation = orientation;
            // 激活新朝向的节点
            if (bodyNodes.TryGetValue(orientation, out var newNode))
            {
                newNode.SetActive(true);
            }
        }

        /// <summary>
        /// 根据方向尝试移动实体。
        /// </summary>
        public virtual void TryMove()
        {
            if (IsAttacking)
                return;
            transform.position += direction * (attributes.moveSpeed * Time.deltaTime * (IsChase ? 1 : 0.5f));
        }

        /// <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)
        {
            var hit = from.attributes.attack - attributes.defense;
            if (hit < 0)
                hit = from.attributes.attack / 100;
            attributes.health -= hit;
            currentJob?.StopJob();
            ShowHealthBar();
        }

        public void ShowHealthBar()
        {
            if(!healthBarPrefab)
                return;
            healthBarPrefab.gameObject.SetActive(true);
            healthBarPrefab.Progress = (float)attributes.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()
        {
            attributes.health = 0;
        }

        /// <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;
            Orientation ori;
            // 判断方向向量最接近哪个朝向
            if (Mathf.Abs(direction.y) > Mathf.Abs(direction.x))
            {
                // 垂直方向优先
                ori = direction.y > 0 ? Orientation.Up : Orientation.Down;
            }
            else
            {
                // 水平方向优先
                ori = direction.x > 0 ? Orientation.Right : Orientation.Left;
            }
            SetOrientation(ori);
        }

        /// <summary>
        /// 自动行为逻辑，根据行为树执行任务。
        /// </summary>
        protected virtual void AutoBehave()
        {
            if (aiTree == null)
                return;
            if (currentJob == null || !currentJob.Running)
            {
                currentJob = aiTree.GetJob(this);
                if (currentJob == null)
                {
                    if (!_warning)
                    {
                        Debug.LogWarning($"{GetType().Name}类型的{name}没有分配到任何工作，给行为树末尾添加等待行为，避免由于没有工作导致无意义的反复查找工作导致性能问题");
                        _warning = true;
                    }
                    return;
                }
                currentJob.StartJob(this);
            }

            currentJob.Update();
        }
        

        /// <summary>
        /// 更新玩家控制的逻辑，处理输入和移动。
        /// </summary>
        protected virtual void UpdatePlayerControls()
        {
            // 检测 Shift 键状态
            var isHoldingShift = Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift);
            IsChase = !isHoldingShift; // 按住 Shift 时 IsChase = false，否则 true
                                       // 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.GetMouseButtonDown(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;

            // 设置目标位置（2D 移动，Z 轴保持不变）
            var targetPosition = transform.position + new Vector3(inputDirection.x, inputDirection.y, 0);

            // 调用 SetTarget 方法设置目标位置
            SetTarget(targetPosition);

            // 调用 TryMove 方法处理实际移动逻辑
            TryMove();


        }
        // 攻击流程协程
        IEnumerator AttackFlow()
        {
            // 播放攻击动画并获取动画持续时间
            var animationDuration = PlayAttackAnimation();
            // 等待动画执行完毕
            yield return new WaitForSeconds(animationDuration);
            // 调用检测并攻击敌人的方法
            DetectAndAttackEnemies();
            // 攻击流程结束，清理协程引用
            attackCoroutine = null;
        }



        /// <summary>
        /// 播放攻击动画。
        /// </summary>
        /// <returns>开始检测攻击范围内敌人的时间。</returns>
        public float PlayAttackAnimation()
        {
            // 启动协程来执行攻击动画
            StartCoroutine(ShakeInDirectionCoroutine());

            // 返回检测敌人的起始时间
            return attackAnimationDuration;
        }
        
        private IEnumerator ShakeInDirectionCoroutine()
        {
            var originalPosition = transform.position; // 记录原始位置
            transform.position += direction * shakeOffset;
            yield return new WaitForSeconds(attackAnimationDuration);
            transform.position = originalPosition;
        }

        public void DetectAndAttackEnemies()
        {
            var attackCount = attributes.attackTargetCount;
            // 获取攻击范围内的所有碰撞体
            var hits = Physics2D.OverlapCircleAll(
                transform.position, 
                attributes.attackRange, 
                LayerMask.GetMask("Entity"));

            foreach (var hit in hits)
            {
                if (attackCount <= 0) break;

                // 检查是否是自身（额外安全措施）
                if (hit.gameObject == this.gameObject) continue;

                // 获取Entity组件
                var entity = hit.GetComponent<Entity>();
                if (!entity) continue;

                // 执行攻击
                entity.OnHit(this);
                attackCount--;
            }
        }
    }
}