using UnityEngine;
using System.Collections;

public class SkeletonUtilityEyeConstraint : SkeletonUtilityConstraint
{

    public Transform[] eyes;
    public float radius = 0.5f;
    public Transform target;
    public Vector3 targetPosition;
    public float speed = 10;
    Vector3[] origins;
    Vector3 centerPoint;

    protected override void OnEnable()
    {
        if (!Application.isPlaying)
            return;

        base.OnEnable();

        Bounds centerBounds = new Bounds(eyes[0].localPosition, Vector3.zero);
        origins = new Vector3[eyes.Length];
        for (int i = 0; i < eyes.Length; i++)
        {
            origins[i] = eyes[i].localPosition;
            centerBounds.Encapsulate(origins[i]);
        }

        centerPoint = centerBounds.center;
    }

    protected override void OnDisable()
    {
        if (!Application.isPlaying)
            return;

        base.OnDisable();
    }

    public override void DoUpdate()
    {

        if (target != null)
            targetPosition = target.position;

        Vector3 goal = targetPosition;

        Vector3 center = transform.TransformPoint(centerPoint);
        Vector3 dir = goal - center;

        if (dir.magnitude > 1)
            dir.Normalize();

        for (int i = 0; i < eyes.Length; i++)
        {
            center = transform.TransformPoint(origins[i]);
            eyes[i].position = Vector3.MoveTowards(eyes[i].position, center + (dir * radius), speed * Time.deltaTime);
        }

    }
}