/*

 * JavaScript file

 */

function init()

{

	widget.setDisplayPortrait();

	watchSensorNotifications();

}

// Call this function to add a callback that will be notified of orientation changes

function watchSensorNotifications() {

	var sensors = device.getServiceObject("Service.Sensor", "ISensor");

	var SensorParams = {

		SearchCriterion : "Orientation" // TODO Possible values (one of):

			// SearchCriterion : "All"

			// SearchCriterion : "AccelerometerAxis"

			// SearchCriterion : "AccelerometerDoubleTapping"

			// SearchCriterion : "Rotation"

	};

	var result = sensors.ISensor.FindSensorChannel(SensorParams);

	if (result.ErrorCode != 0) {

		var errorCode = result.ErrorCode;

		var errorMessage = result.ErrorMessage;

		// TODO Handle error

		return null;

	}

    // TODO Function named "sensorCallback" will be called when device orientation changes. This function should be created. 

	var result2 = sensors.ISensor.RegisterForNotification(

			{ ChannelInfoMap : result.ReturnValue[0], 

				ListeningType : "ChannelData" }, sensorCallback);

	if (result.ErrorCode == 0) {

		var transactionId = result.TransactionID;

		// TODO Use this transaction ID to cancel notifications when watching orientation is no longer needed

		return transactionId;

	} else {

		var errorCode = result.ErrorCode;

		var errorMessage = result.ErrorMessage;

		// TODO Handle error

		return null;

	}

}

// This function can be passed as callback to 

// sensors.ISensor.RegisterForNotification method

function sensorCallback(transactionId, code, result) {

	if (result.ErrorCode == 0) {

		// TODO Process notification

		var dataType = result.ReturnValue.DataType; // One of: "AxisData", "DoubleTappingData", "OrientationData" or "RotationData"

		var orientation = result.ReturnValue.DeviceOrientation; // Orientation

		// var xAxis = result.ReturnValue.XAxisData; // Accelerometer

		// var yAxis = result.ReturnValue.YAxisData; // Accelerometer

		// var zAxis = result.ReturnValue.ZAxisData; // Accelerometer

		// var direction = result.ReturnValue.DeviceDirection; // Accelerometer double tapping

		// var xRotation = result.ReturnValue.XRotation; // Rotation

		// var yRotation = result.ReturnValue.YRotation; // Rotation

		// var zRotation = result.ReturnValue.ZRotation; // Rotation

		setVisibleDiv(orientation);

	} else {

		var errorCode = result.ErrorCode;

		var errorMessage = result.ErrorMessage;

		// TODO Handle error

	}

}

function setVisibleDiv(orientation) {

	var elements = document.getElementsByTagName("div");

	for ( var i = 0; i < elements.length; i++) {

		var el = elements[i];

		el.style.display = el.id == orientation ? "inherit" : "none";

	}

	document.getElementById("orientation").innerHTML = orientation;

}