using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using XFramework;

public class NavMeshManager : MonoBehaviour
{
    public Transform targetPoints;
    public LineRenderer lineRenderer;
    NavMeshAgent meshAgent;

    bool showLine= false;
    // Start is called before the first frame update
    void Start()
    {
        meshAgent = this.transform.GetOrAddComponent<NavMeshAgent>();
        if (showLine)
        {
            lineRenderer = new GameObject("LineRenderer").transform.GetOrAddComponent<LineRenderer>();
        }
    }

    /// <summary>
    /// 设置待寻路的起点
    /// </summary>
    /// <param name="startPos"></param>
    public void SetStartPos(Vector3 startPos)
    {
        if(meshAgent==null)
            meshAgent = this.transform.GetOrAddComponent<NavMeshAgent>();
        meshAgent.enabled = false;
        this.transform.position = startPos;
        meshAgent.enabled = true;

        //if (!meshAgent.isOnNavMesh)
        //    meshAgent.Warp(this.transform.position);
    }

    /// <summary>
    /// 设置待寻路的终点 并返回该点位置是否可达 返回数组为空时代表不可达
    /// </summary>
    /// <param name="postion">终点位置</param>
    public Vector3[] SetTargetPointPostion(Vector3 postion)
    {
        NavMeshPath meshPath = new NavMeshPath();
        meshAgent.CalculatePath(postion, meshPath);
        
        if (meshPath.status == NavMeshPathStatus.PathComplete)
        {
            meshAgent.enabled = false;
            this.transform.position = postion;
            meshAgent.enabled = true;
            if (lineRenderer)
            {
                lineRenderer.positionCount = meshPath.corners.Length;
                lineRenderer.SetPositions(meshPath.corners);
            }
            return meshPath.corners;
        }
        else
        {
            return null;
        }

    }


    // Update is called once per frame
    void Update()
    {
        //if (Input.GetKeyDown(KeyCode.Space))
        //{
        //    //meshAgent.destination = targetPoints.position;
        //   // Debug.Log("hasPath:" + meshAgent.hasPath);
        //    NavMeshPath meshPath = new NavMeshPath();
        //    meshAgent.CalculatePath(targetPoints.position, meshPath);
        //    if (meshPath.status == NavMeshPathStatus.PathComplete)
        //    {
        //        Debug.Log("该路点可达");
        //        lineRenderer.LineCount = meshPath.corners.Length;
        //        lineRenderer.lineRenderer.SetPositions(meshPath.corners);
        //    }
        //    //for (int i = 0; i < meshAgent.path.corners.Length; i++)
        //    //{
        //    //    lineRenderer.AddPostion(meshAgent.path.corners[i]);
        //    //}

        //}

       
    }
}