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package com.badlogic.gdx.tools.flame;

import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.ObjectMap;

/** @author Inferno */
public class EventManager {
	private static EventManager mInstance;

	public interface Listener {
		public void handle (int aEventType, Object aEventData);
	}

	private ObjectMap> mListeners;

	private EventManager () {
		mListeners = new ObjectMap>();
	}

	public static EventManager get () {
		if (mInstance == null) mInstance = new EventManager();
		return mInstance;
	}

	public void attach (int aEventType, Listener aListener) {
		boolean isNew = false;
		Array listeners = mListeners.get(aEventType);
		if (listeners == null) {
			listeners = new Array();
			mListeners.put(aEventType, listeners);
			isNew = true;
		}

		if (isNew || !listeners.contains(aListener, true)) {
			listeners.add(aListener);
		}

	}

	public void detach (int aEventType, Listener aListener) {
		Array listeners = mListeners.get(aEventType);
		if (listeners != null) {
			listeners.removeValue(aListener, true);
			if (listeners.size == 0) mListeners.remove(aEventType);
		}
	}

	public void fire (int aEventType, Object aEventData) {
		Array listeners = mListeners.get(aEventType);
		if (listeners != null) for (Listener listener : listeners) {
			listener.handle(aEventType, aEventData);
		}
	}

	public void clear () {
		mListeners.clear();
	}

}