using System;
using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.UIElements;

public class RedGhost : MonoBehaviour
{
    // ========== 状态枚举 ==========
    public enum GhostState
    {
        Idle,        //开局的待机
        Start,      //离开重生点出发
        Chase,      // 追击模式
        Frightened, // 恐惧模式,逃跑
        Die       // 死亡重生
    }
    public GhostState curstate;//当前枚举

    [Header("基础配置")]
    public Rigidbody2D rb;
    public Animator anim;
    public GameObject pacMan;//吃豆人主角
    public LayerMask obstadeLayer;//墙的层级

    [Header("追击逃跑逻辑相关")]
    private Vector2 currentDirection;     //当前方向

    // 新增射线参数
    [Header("射线设置")]
    public float castDistance = 1f;     // 射线检测长度
    public float boxWidth = 0.3f;       // 射线宽度
    public Color validColor = Color.green;  // 有效射线颜色
    public Color blockedColor = Color.red;  // 受阻射线颜色

    public float speed;//基础速度
    public float frightenedSpeed;//逃跑速度

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
        // anim = GetComponent<Animator>();
        pacMan = GameObject.Find("PacManPlayer");//找到主角
    }

    private void Update()
    {
        switch (curstate)
        {
            case GhostState.Idle:
                Idle();
                break;
            case GhostState.Start:
                GhostStart();
                break;
            case GhostState.Chase:
                Chase();
                break;
            case GhostState.Frightened:
                Frightened();
                break;
            case GhostState.Die:
                Die();
                break;
        }
    }


   
    private void Idle()
    {
        curstate = GhostState.Chase;
    }

    private void GhostStart()
    {
        throw new NotImplementedException();
    }


    private void Chase()
    {
        UpdateMovement(pacMan.transform.position, true);
    }

    private void Frightened()
    {
        throw new NotImplementedException();
    }

    private void Die()
    {
        throw new NotImplementedException();
    }




    // 核心移动逻辑（追击/逃跑共用）
    private void UpdateMovement(Vector2 targetPos, bool isChasing)
    {
        Vector2[] directions = { Vector2.up, Vector2.down, Vector2.left, Vector2.right };
        Vector2 bestDir = Vector2.zero;
        float bestValue = isChasing ? Mathf.Infinity : -Mathf.Infinity;//正无穷大，负无穷大

        foreach (Vector2 dir in directions)
        {
            if (dir == -currentDirection) continue; // 循环到的方向等于当前的负方向，继续执行，禁止直接回头

            // 使用BoxCast进行区域检测
            bool isBlocked = Physics2D.BoxCast(transform.position,GetBoxSize(dir),0f,dir,castDistance,obstadeLayer);

            if (isBlocked) continue;

            // 计算方向价值
            float distance = Vector2.Distance(rb.position + dir, targetPos);//当前坐标加方向向量和目标主角坐标的差值
            float currentValue = isChasing ? distance : -distance;//是追击还是逃跑

            if ((isChasing && currentValue < bestValue) || (!isChasing && currentValue > bestValue))
            {
                bestValue = currentValue;
                bestDir = dir;
            }
        }

        if (bestDir != Vector2.zero)
        {
            currentDirection = bestDir;
            rb.velocity = currentDirection.normalized * (curstate == GhostState.Frightened ? frightenedSpeed : speed) * Time.deltaTime;
        }
    }

    // 根据方向获取不同的射线盒子尺寸
    private Vector2 GetBoxSize(Vector2 direction)
    {
        return new Vector2(
            direction.x = boxWidth,
            direction.y = boxWidth
        );
    }

    // 可视化射线
    private void OnDrawGizmos()
    {
        if (!Application.isPlaying) return;

        foreach (Vector2 dir in new[] { Vector2.up, Vector2.down, Vector2.left, Vector2.right })
        {
            Gizmos.color = Physics2D.BoxCast(transform.position, GetBoxSize(dir), 0f, dir, castDistance, obstadeLayer)
                ? blockedColor
                : validColor;

            DrawBoxCastGizmo(
                transform.position,
                dir,
                GetBoxSize(dir),
                castDistance
            );
        }
    }

    // 绘制盒子投射区域
    private void DrawBoxCastGizmo(Vector2 origin, Vector2 direction, Vector2 size, float distance)
    {
        Vector2 endPos = origin + direction * distance;

        // 绘制起点和终点的盒子
        Gizmos.DrawWireCube(origin, size);
        Gizmos.DrawWireCube(endPos, size);

        // 绘制连接线
        Vector2 perpendicular = new Vector2(-direction.y, direction.x) * size.x / 2;
        Vector2 edge1 = origin + perpendicular;
        Vector2 edge2 = origin - perpendicular;
        Gizmos.DrawLine(edge1, edge1 + direction * distance);
        Gizmos.DrawLine(edge2, edge2 + direction * distance);
    }
}