using UnityEngine;
using System.Collections;

public enum DoorState{
	Closed,
	Closing,
	Opened,
	Opening
}

public delegate void DoorStateDelegate(Door sender, DoorState from, DoorState to);

public class Door : MonoBehaviour {

	private Animator anim;
	private float state;
	public float speed = 1.0f;
	public float direction;
	private DoorState doorState;
	private SpriteRenderer _renderer;

	public event DoorStateDelegate StateChanged;

	protected virtual void OnStateChanged (DoorState from, DoorState to)
	{
		var handler = StateChanged;
		if (handler != null)
			handler (this, from, to);
	}

	public DoorState State{
		get{return doorState;}
	}

	// Use this for initialization
	void Start () {
		anim = gameObject.GetComponent<Animator>();
		_renderer = gameObject.GetComponent<SpriteRenderer>();
		_renderer.enabled = false;
		state = 0;
	}

	public void Open(){
		if((doorState == DoorState.Opened) || (doorState == DoorState.Opening)){
			return;
		}
		OnStateChanged(doorState, DoorState.Opening);
		direction = 1.0f;
		doorState = DoorState.Opening;
	}

	public void Close(){
		if((doorState == DoorState.Closed) || (doorState == DoorState.Closing)){
			return;
		}
		OnStateChanged(doorState, DoorState.Closing);
		doorState = DoorState.Closing;
		direction = -1.0f;

	}
	
	// Update is called once per frame
	void Update () {
		if(direction == 0.0f){
			return;
		}


		state = Mathf.Clamp01(state + direction * speed * Time.deltaTime);

		_renderer.enabled = state != 0.0f;

		if(direction < 0.0f && state == 0.0f){
			direction = 0.0f;

			OnStateChanged(doorState, DoorState.Closed);
			doorState = DoorState.Closed;
		}
		if(direction > 0.0f && state == 1.0f){
			direction = 0.0f;
			OnStateChanged(doorState, DoorState.Opened);
			doorState = DoorState.Opened;
		}

		anim.SetFloat("DoorState", state);
	}
}