Generic_NonPlayer

using UnityEngine;
using System.Collections;
/*
This script controls generic non-player characters with NavAgent component that walk around the 
envronment, visiting waypoints and avoiding collisions.
*/
public class Generic_NonPlayer : MonoBehaviour {

	private GameObject[] wayPoints;
	private int wayPointIndex =0;
	public GameObject player;
	Animator anim;
	NavMeshAgent agent;
	public bool moving;
	Vector3 direction;
	public float idleWait;

	// Use this for initialization
	void Start () {
		
		direction = player.GetComponent<Transform>().position + this.transform.position;
		anim = GetComponent<Animator> ();
		agent = GetComponent<NavMeshAgent> ();

		//load all waypoints into array.
		wayPoints = GameObject.FindGameObjectsWithTag ("waypoint");
		wayPointIndex = Random.Range (0, wayPoints.Length);

		//start walking
		if(moving) StartCoroutine(Walk(0));
	}


	void ChangeWaypoint()
	{
		//randomly assign new destination
		int currentWaypoint = wayPointIndex;
		while (currentWaypoint == wayPointIndex) {
			wayPointIndex = Random.Range (0, wayPoints.Length);
		}
		//Debug.Log ("Change destination to " + wayPoints [wayPointIndex].name); 
	}


	// Update is called once per frame
	void Update () {
		if (moving) CheckArrival ();

	}

	//Character will walk to next waypoint and wait for "wait" seconds
	IEnumerator Walk(float wait)
	{
		yield return new WaitForSeconds (wait);
		//Debug.Log ("Walking to Destination: " + wayPoints [wayPointIndex].name);
		anim.SetBool ("isWalking", true);
		agent.SetDestination (wayPoints [wayPointIndex].transform.position);
		moving = true;
	}

	void Idle()
	{
		//Debug.Log ("Idle"); 
		anim.SetBool ("isWalking", false);
	}

	//when arriving at a waypoint, load the next one
	void CheckArrival()
	{
		if (Mathf.Round(transform.position.x) == Mathf.Round(wayPoints[wayPointIndex].GetComponent<Transform>().position.x) && Mathf.Round(transform.position.z) == Mathf.Round(wayPoints[wayPointIndex].GetComponent<Transform>().position.z)) 
		{
			//Debug.Log ("Arrived at " + wayPoints [wayPointIndex].name);
			Idle ();
			ChangeWaypoint ();
			StartCoroutine(Walk(idleWait));
			return;
		}
	}
}