Unit

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Unit : MonoBehaviour {


    public Transform target;
    public float speed = 2;
    public int essence = 100;
    public string weakness;
    Vector3[] path;
    int targetIndex;
    Grid grid;

    void Awake() {
        target = GameObject.FindGameObjectWithTag ("Target").transform;
    }

    void Start() {
        UpdatePath ();
    }

    public void TakeDamage (int amount) {
        essence -= amount;
        PlayerStats.playerEssence += amount;
        if (essence <= 0) {
            Die ();
        }
    }

    void Die (){
        Destroy (gameObject);
        return;
    }

    public void OnPathFound(Vector3[] newPath, bool pathSuccessful) {
        if (pathSuccessful) {
            Debug.Log ("Path Found!");
            path = newPath;
            targetIndex = 0;
            StopCoroutine ("FollowPath");
            StartCoroutine ("FollowPath");
        } else {
            return;
        }
    }

    IEnumerator FollowPath() {
        targetIndex = 0;
        Vector3 currentWaypoint = path[0];
        while (true) {
            if (transform.position == currentWaypoint) {
                targetIndex ++;
                if (targetIndex == path.Length) {
                    Destroy (gameObject);
                    PlayerStats.playerLives -= 1;
                    Debug.Log ("You lost a life!");
                    yield break;
                }
                currentWaypoint = path[targetIndex];
            }

            transform.position = Vector3.MoveTowards(transform.position,currentWaypoint,speed * Time.deltaTime);
            yield return null;

        }
    }

    public void UpdatePath () {
        if (gameObject == null)
            return;
            PathRequestManager.RequestPath (transform.position, target.position, OnPathFound);
    }

    public void OnDrawGizmos() {
        if (path != null) {
            for (int i = targetIndex; i < path.Length; i ++) {
                Gizmos.color = Color.black;
                Gizmos.DrawCube(path[i], Vector3.one);
            }
        }
    }
}