using UnityEngine;

public class SplineWalker : MonoBehaviour
{
	public enum SplineWalkerMode
	{
		Once,
		Loop,
		PingPong
	}

	public BezierSpline spline;

	public float duration;

	public bool lookForward;

	public SplineWalkerMode mode;

	public float progress;
	public bool goingForward = true;

	private void Update ()
	{
		if (goingForward) {
			progress += Time.deltaTime / duration;

			if (progress > 1f) {
				if (mode == SplineWalkerMode.Once) {
					progress = 1f;
				} else if (mode == SplineWalkerMode.Loop) {
					progress -= 1f;
				} else {
					progress = 2f - progress;

					goingForward = false;
				}
			}
		} else {
			progress -= Time.deltaTime / duration;

			if (progress < 0f) {
				progress = -progress;

				goingForward = true;
			}
		}

		Vector3 position = spline.GetPoint (progress);

		transform.localPosition = position;

		if (lookForward) {
			transform.LookAt (position + spline.GetDirection (progress));
		}
	}
}