using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using Random = UnityEngine.Random;

public class GetNavmesh : MonoBehaviour
{
    void DrawCircle(Vector3 center, float radius, Color color)
    {
        Vector3 prevPos = center + new Vector3(radius, 0, 0);
        for (int i = 0; i < 30; i++)
        {
            float angle = (float)(i + 1) / 30.0f * Mathf.PI * 2.0f;
            Vector3 newPos = center + new Vector3(Mathf.Cos(angle) * radius, 0, Mathf.Sin(angle) * radius);
            Debug.DrawLine(prevPos, newPos, color);
            prevPos = newPos;
        }
    }

    public float distanceToNewPoint = 25f; //how far away is the new point

    private NavMeshAgent agent;

    private void Start()
    {
        agent = GetComponent<NavMeshAgent>();
        StartCoroutine(FindNavmesh());
    }

    private IEnumerator FindNavmesh()
    {
        NavMeshPath path = new NavMeshPath();
        Vector3 newDest;
        do
        {
            //random vector3
            Vector3 randomDirection = new Vector3(Random.value, Random.value, Random.value);
            //set the magnitude of the vector3 (this could be randomized too if you want)
            randomDirection *= distanceToNewPoint;
            //randomly pick a negative value for the x or z
            if (Random.Range(0, 2) == 0) randomDirection.x *= -1;
            if (Random.Range(0, 2) == 0) randomDirection.z *= -1;

            //add the random vector to the current position
            Vector3 v = transform.position + randomDirection;

            //determine the y value by looking at the terrain height
            float y;
            y = Terrain.activeTerrain.SampleHeight(v) + Terrain.activeTerrain.transform.position.y;

            newDest = new Vector3(v.x, y, v.z);

            //calculate the path
            agent.CalculatePath(newDest, path);
            Debug.Log(path.status);
            yield return null;
        } while (path.status != NavMeshPathStatus.PathComplete);
    }
}