package org.mt4j.input.inputSources;



import java.util.HashMap;

import java.util.Map;

import java.util.Observable;

import java.util.Observer;



import org.mt4j.MTApplication;

import org.mt4j.input.inputData.ActiveCursorPool;

import org.mt4j.input.inputData.InputCursor;

import org.mt4j.input.inputData.MTFingerInputEvt;

import org.mt4j.util.MT4jSettings;



import com.alderstone.multitouch.mac.touchpad.Finger;

import com.alderstone.multitouch.mac.touchpad.FingerState;

import com.alderstone.multitouch.mac.touchpad.TouchpadObservable;



/**

 * Input source for Mac OS X Trackpads.

 * Uses the library from http://kenai.com/projects/macmultitouch

 * 

 * @author Florian Thalmann

 */

public class MacTrackpadSource extends AbstractInputSource implements Observer {



	private TouchpadObservable tpo;

	private int windowWidth, windowHeight;

	private Map<Integer, Long> fingerIdToCursorId;

	

	public MacTrackpadSource(MTApplication mtApp) {

		super(mtApp);

		this.tpo = TouchpadObservable.getInstance();

		this.tpo.addObserver(this);

		

		this.windowWidth = MT4jSettings.getInstance().getWindowWidth();

		this.windowHeight = MT4jSettings.getInstance().getWindowHeight();

		

		this.fingerIdToCursorId = new HashMap<Integer, Long>();

	}



	public void update(Observable obj, Object arg) {

		Finger finger = (Finger) arg;

		int fingerID = finger.getID();

		

		ActiveCursorPool cursorPool = ActiveCursorPool.getInstance();

		int inputID;

		Long cursorID = fingerIdToCursorId.get(fingerID);

		InputCursor cursor = (cursorID != null)? cursorPool.getActiveCursorByID(cursorID) : null;

		

		if (finger.getState() == FingerState.PRESSED) {

			if (cursor == null) { //new finger

				cursor = new InputCursor();

				fingerIdToCursorId.put(fingerID, cursor.getId());

				cursorPool.putActiveCursor(cursor.getId(), cursor);

				inputID = MTFingerInputEvt.INPUT_STARTED;

			} else { //updated finger

				inputID = MTFingerInputEvt.INPUT_UPDATED;

			}

		} else { //removed finger

			if (cursorID != null){

				cursorPool.removeCursor(cursorID);

			}

			fingerIdToCursorId.remove(fingerID);

			inputID = MTFingerInputEvt.INPUT_ENDED;

		}

		

		int absoluteX = Math.round(finger.getX()*this.windowWidth);

		int absoluteY = Math.round((1-finger.getY())*this.windowHeight);

		this.enqueueInputEvent(new MTFingerInputEvt(this, absoluteX, absoluteY, inputID, cursor));

	}



	public void update() {}



}