using UnityEngine;
using System.Collections;

namespace NobleMuffins.LimbHacker.Examples
{
	[RequireComponent(typeof(Collider))]
	public class Button : MonoBehaviour
	{
		const float changeTime = 0.033f;

		public new Camera camera;

		public GameObject target;
		public string message;

		public AudioClip clickSound;

		public bool visible;

		private new Transform transform;
		private new Collider collider;
		private Vector3 scaleAtStart;

		private float size = 1f, sizeDelta = 0f;
		private bool pressedAsButton = false;

		void Start()
		{
			transform = GetComponent<Transform>();
			collider = GetComponent<Collider>();

			scaleAtStart = transform.localScale;

			if (camera == null) camera = Camera.main;
		}

		private bool firstRun = true;

		void Update()
		{
			Ray ray = camera.ScreenPointToRay(Input.mousePosition);

			RaycastHit hitInfo;

			bool hover = collider.Raycast(ray, out hitInfo, 2f);

			pressedAsButton |= hover && Input.GetMouseButtonDown(0);

			bool released = Input.GetMouseButtonUp(0);

			bool releasedAsButton = pressedAsButton && hover && released;

			if (released)
			{
				pressedAsButton = false;
			}

			if (releasedAsButton)
			{
				target.SendMessage(message);

				if (clickSound != null)
				{
					AudioSource.PlayClipAtPoint(clickSound, Vector3.zero);
				}
			}

			bool enlarge = hover || pressedAsButton;

			float idealSize = (enlarge ? 1.1f : 1f) * (visible ? 1f : 0f);

			size = firstRun ? idealSize : Mathf.SmoothDamp(size, idealSize, ref sizeDelta, changeTime);

			firstRun = false;

			transform.localScale = size * scaleAtStart;
		}
	}
}