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

[RequireComponent(typeof(LineRenderer))]
public class GuideArrowPath : NetworkBehaviour
{
    // 内部变量
    private NavMeshPath navPath;
    private LineRenderer lineRenderer;

    void Start()
    {
        // 获取LineRenderer组件
        lineRenderer = GetComponent<LineRenderer>();
        // 初始化NavMeshPath
        navPath = new NavMeshPath();
        // 尝试第一次更新路径
    }

    /// <summary>
    /// 根据起点与终点计算最短路径，并更新Line Renderer的显示
    /// </summary>
    public void SetPath(Vector3 start, Vector3 end)
    {
        navPath = new NavMeshPath();
        // 使用NavMesh计算路径，静态障碍物会自动参与计算
        if (NavMesh.CalculatePath(start, end, NavMesh.AllAreas, navPath))
        {
            // 如果计算出有效路径且路径点数量大于1则更新LineRenderer
            if (navPath.corners.Length > 1)
            {
                lineRenderer.positionCount = navPath.corners.Length;
                List<Vector3> path = new List<Vector3>();
                foreach (Vector3 point in navPath.corners)
                {
                    path.Add(new Vector3(point.x,0.5f,point.z));
                }
                lineRenderer.SetPositions(path.ToArray()); 
            }
            else
            {
                lineRenderer.positionCount = 0;
            }
        }
        else
        {
            Debug.LogWarning("未能计算出有效路径！");
            lineRenderer.positionCount = 0;
        }
    }

    public float GetToTargetDis(Vector3 start, Vector3 end)
    {
        float dis = -1;
        if (NavMesh.CalculatePath(start, end, NavMesh.AllAreas, navPath))
        {
            if (navPath.corners.Length > 1)
            {
                dis = 0;
                for (int i = 0; i < navPath.corners.Length; i++)
                {
                    if (i + 1 < navPath.corners.Length)
                    {
                        dis+= Vector3.Distance(navPath.corners[i], navPath.corners[i + 1]);    
                    }
                }
            }
        }
        return dis;
    }

    public void ShowPath()
    {
        gameObject.GetComponent<LineRenderer>().enabled = true;
    }

    public void ClosePath()
    {
        gameObject.GetComponent<LineRenderer>().enabled = false;
    }
}