using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using XFramework.Objects;

//测量功能实现类
public class Surveyor 
{
    GameObject rulerPrefab;

    RulerInstanceCtrl currentRuler;//当前待测量的点

    public List<GameObject> rulers = new List<GameObject>();
    public Surveyor(GameObject rulerPrefab)
    {
        this.rulerPrefab = rulerPrefab;
    }

    /// <summary>
    /// 循环函数 监听测量输入
    /// </summary>
    public void Update()
    {
        if (EventSystem.current != null && EventSystem.current.IsPointerOverGameObject()) return; //射线检测时屏蔽UI部分
        if (Input.GetMouseButtonDown(0))//鼠标点击地面时 
        {
            Vector3 point = GetRayHitPoint();
            if (point != Vector3.zero)
                SetPoint(point);
        }

        if (currentRuler)//当前测量未完成时 不断更新第二个测量点位
        {
            Vector3 point = GetRayHitPoint();
            if (point != Vector3.zero)
                currentRuler?.SetSecondPos(point);
        }
    }


    //结束测量 收起所有的尺子
    public void StopCL()
    {
        for (int i = 0; i < rulers.Count; i++)
        {
            ObjectPool.Instance.Destroy(rulers[i].gameObject);
        }
    }

    /// <summary>
    /// 设置待测量点   第一个点生成测量实例  第二个点完成一次测量 
    /// </summary>
    void SetPoint(Vector3 point)
    {
        if (currentRuler == null)//当前没有等待设置第二个点的尺子 重新复制一把 并将该点位确认为起点
        {
            currentRuler = ObjectPool.Instance.Instantiate(rulerPrefab).GetComponent<RulerInstanceCtrl>();
            rulers.Add(currentRuler.gameObject);
            currentRuler.SetFirstPos(point);
        }
        else//当前有等待设置第二个点的尺子 确定第二点位 即放下尺子 
        {
            currentRuler.SetSecondPos(point);
            currentRuler = null;
        }
    }


    //获取点击的地面位置
    Vector3 GetRayHitPoint()
    {
        RaycastHit hit;//鼠标射线检测
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        if (Physics.Raycast(ray, out hit, 2000, LayerMask.GetMask("Floor")))
        {
            return hit.point;
        }
        return Vector3.zero;
    }


}