function Acceleration(x, y, z)
{
  this.x = x;
  this.y = y;
  this.z = z;
  this.timestamp = new Date().getTime();
}

// Need to define these for android
_accel = {};
_accel.x = 0;
_accel.y = 0;
_accel.z = 0;

function gotAccel(x, y, z)
{
	_accel.x = x;
	_accel.y = y;
	_accel.z = z;
}

/**
 * This class provides access to device accelerometer data.
 * @constructor
 */
function Accelerometer() {
	/**
	 * The last known acceleration.
	 */
	this.lastAcceleration = null;
}

/**
 * Asynchronously aquires the current acceleration.
 * @param {Function} successCallback The function to call when the acceleration
 * data is available
 * @param {Function} errorCallback The function to call when there is an error 
 * getting the acceleration data.
 * @param {AccelerationOptions} options The options for getting the accelerometer data
 * such as timeout.
 */
Accelerometer.prototype.getCurrentAcceleration = function(successCallback, errorCallback, options) {
	// If the acceleration is available then call success
	// If the acceleration is not available then call error

	// Created for iPhone, Iphone passes back _accel obj litteral
	if (typeof successCallback == "function") {
		var accel = new Acceleration(_accel.x,_accel.y,_accel.z);
		Accelerometer.lastAcceleration = accel;
		successCallback(accel);
	}
}

/**
 * Asynchronously aquires the acceleration repeatedly at a given interval.
 * @param {Function} successCallback The function to call each time the acceleration
 * data is available
 * @param {Function} errorCallback The function to call when there is an error 
 * getting the acceleration data.
 * @param {AccelerationOptions} options The options for getting the accelerometer data
 * such as timeout.
 */

Accelerometer.prototype.watchAcceleration = function(successCallback, errorCallback, options) {
	// TODO: add the interval id to a list so we can clear all watches
 	var frequency = (options != undefined)? options.frequency : 10000;
	
	Accel.start(frequency);
	return setInterval(function() {
		navigator.accelerometer.getCurrentAcceleration(successCallback, errorCallback, options);
	}, frequency);
}

/**
 * Clears the specified accelerometer watch.
 * @param {String} watchId The ID of the watch returned from #watchAcceleration.
 */
Accelerometer.prototype.clearWatch = function(watchId) {
	Accel.stop();
	clearInterval(watchId);
}

PhoneGap.addConstructor(function() {
    if (typeof navigator.accelerometer == "undefined") navigator.accelerometer = new Accelerometer();
});