using UnityEngine;
using System.Collections;

public enum ButtonState{
	Error,
	Locked,
	Ready
}


public delegate void ButtonEventHandler();

public class Button : Trigger {
	public ButtonState state;
	public PlayerSensor sensor;
	private GameAction _pressAction;
	public bool interactive = true;
	public Predicate interactivePredicate;
	public event ButtonEventHandler Pressed;
	public bool locked = false;
	public Predicate lockedPredicate;
	public Predicate errorPredicate;
	public bool error;
	public string pressActionText = "Press the button";

	protected virtual void OnPressed ()
	{
		var handler = Pressed;
		if (handler != null)
			handler ();
	}

	void Start () {
		if(sensor != null){
			sensor.PlayerEnter += HandlePlayerEnter;
			sensor.PlayerExit += HandlePlayerExit;
		}else{
			Debug.LogWarningFormat("Button {0} sensor is null", name );
		}

		_pressAction = new GameAction(gameObject, pressActionText);
	}

	void HandlePlayerEnter (PlayerSensor sensor, GameObject player)
	{
		if(interactive){
			ActionController.AddAction(_pressAction);
		}
	}
	void HandlePlayerExit (PlayerSensor sensor, GameObject player)
	{
		ActionController.RemoveAction(_pressAction);
	}

	void SetInteractive(bool val){
		if(interactive == val){
			return;
		}

		if(val){
			if(sensor != null && sensor.Check()){
				ActionController.AddAction(_pressAction);
			}
		}else{
			ActionController.RemoveAction(_pressAction);
		}

		interactive = val;
	}



	void OnAction(ActionArgs a){
		if(interactive){
			if(state == ButtonState.Ready){
				OnPressed();
				OnTrig();
			}
		}
	}

	void Update () {

		if(interactivePredicate != null){
			SetInteractive(interactivePredicate.Check());
		}

		if(errorPredicate.Check()){
			state = ButtonState.Error;
		}else if(lockedPredicate.Check()){
			state = ButtonState.Locked;
		}else{
			state = ButtonState.Ready;
		}




	}
}