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

namespace Entity
{
    public class Entity:MonoBehaviour,ITick
    {
        public AIBase aiTree;
        public JobBase currentJob;
        public AttributesDef attributes;
        public Vector3 direction;
        public GameObject body;
        public string affiliation;

        public bool canSelect = true;
        public bool IsChase { set; get; } = true;
        public bool PlayerControlled
        {
            set
            {
                if (value)
                {
                    IsChase = true;
                    currentJob = null;
                }
                _isPlayerControlled = value;
            }
            get => _isPlayerControlled;
        }

        public bool IsDead => attributes.health <= 0;

        private bool _isPlayerControlled = false;
        private bool _warning = false;


        public virtual void Init(PawnDef pawnDef)
        {
            attributes = pawnDef.attributes.Clone();
            aiTree = ConvertToAIBase(pawnDef.behaviorTree);
            affiliation=pawnDef.affiliation;
            //定义的tag有限，不用这个了
            // if(!string.IsNullOrEmpty(affiliation))
            //     gameObject.CompareTag(affiliation);
        }
        public void Tick()
        {
            if (_isPlayerControlled)
            {
                UpdatePlayerControls();
            }
            else
            {
                AutoBehave();
            }
        }

        public virtual void TryAttck()
        {
            
        }
        /// <summary>
        /// 往对应朝向移动moveSpeed*deltaTime的距离
        /// </summary>
        public virtual void TryMove()
        {
            transform.position+=direction * (attributes.moveSpeed * Time.deltaTime * (IsChase ? 1 : 0.5f));
        }

        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();
        }

        public virtual void SetTarget(Vector3 pos)
        {
            direction = (pos - transform.position).normalized;
        }

        public virtual void Kill()
        {
            attributes.health = 0;
        }

        private void AutoBehave()
        {
            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();
        }

        private 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）
            }

            // 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();
        }
        public static AIBase ConvertToAIBase(BehaviorTreeDef behaviorTreeDef)
        {
            if (behaviorTreeDef == null)
                return null;
            var aiBase = CreateAIBaseInstance(behaviorTreeDef.className);
            if (behaviorTreeDef.childTree != null)
            {
                foreach (var child in behaviorTreeDef.childTree)
                {
                    if (child != null)
                    {
                        aiBase.children.Add(ConvertToAIBase(child));
                    }
                }
            }
            return aiBase;
        }
        // 使用反射根据 className 创建具体的 AIBase 子类实例
        private static AIBase CreateAIBaseInstance(string className)
        {
            if (string.IsNullOrEmpty(className))
                throw new ArgumentException("className 不能为空");
            if (className.Equals("AIBase", StringComparison.OrdinalIgnoreCase))
            {
                return (AIBase)Activator.CreateInstance(typeof(AIBase));
            }
            // 定义可能的命名空间列表
            var possibleNamespaces = new[] { "AI"};

            foreach (var ns in possibleNamespaces)
            {
                try
                {
                    // 获取当前程序集
                    var assembly = typeof(AIBase).Assembly;

                    // 尝试查找类型
                    var type = assembly.GetType($"{ns}.{className}");

                    if (type != null && typeof(AIBase).IsAssignableFrom(type))
                    {
                        // 如果找到合适的类型，则创建实例并返回
                        return (AIBase)Activator.CreateInstance(type);
                    }
                }
                catch
                {
                    // 忽略单个命名空间的错误，继续尝试下一个命名空间
                }
            }

            // 如果所有命名空间都未找到对应的类型，抛出异常
            throw new InvalidOperationException($"无法找到类型 {className} 或该类型不是 AIBase 的子类");
        }
    }
}