using UnityEngine;
using System.Collections;


public class FollowCamera : MonoBehaviour {
	public GameObject target;
	public float minOffset = 0.5f;
	public float maxOffset = 2.5f;
	public float zenith;
	public float azimuth;
	public float mouseSpeed = 0.1f;
	private float offset;

	[Range (-(Mathf.PI * 0.5f), Mathf.PI * 0.5f)]
	public float minZenith = -(Mathf.PI * 0.5f);
	[Range (-(Mathf.PI * 0.5f), Mathf.PI * 0.5f)]
	public float maxZenith = Mathf.PI * 0.5f;

	/*[Range (-(Mathf.PI * 0.5f), Mathf.PI * 0.5f)]
	public float minAzimuth = -(Mathf.PI * 0.5f);
	[Range (-(Mathf.PI * 0.5f), Mathf.PI * 0.5f)]
	public float maxAzimuth = Mathf.PI * 0.5f;*/


	public bool mouseInput = true;
	private SphericalCoordinate direction = new SphericalCoordinate();

	void Start () {
		offset = minOffset;
	}

	void Update () {
		if (target != null && camera != null) {
			offset = Mathf.Clamp(offset, minOffset, maxOffset);

			if(mouseInput){
				zenith += Input.GetAxis ("Mouse Y") * mouseSpeed;
				azimuth -= Input.GetAxis ("Mouse X") * mouseSpeed;
			}

			zenith = Mathf.Clamp(zenith, minZenith, maxZenith);

			direction.ElevationAngle = zenith;
			direction.PolarAngle = azimuth;

			camera.transform.position = target.transform.position + direction.Cartesian * offset;
			camera.transform.LookAt (target.transform);
		}
	}
}