Assets Publishing In Module

I have a module that was written in Yii 1.x and am porting it to 2 (Bbii to be specific). I have this code in its Module class


/**

	 * Register the CSS and JS files for the module

	 */

	public function registerAssets() {

		Yii::app()->clientScript->registerCssFile($this->getAssetsUrl() . '/css/' . $this->bbiiTheme . '/forum.css');

		Yii::app()->getClientScript()->registerCoreScript('jquery.ui');

		Yii::app()->clientScript->registerScriptFile($this->getAssetsUrl() . '/js/bbii.js', CClientScript::POS_HEAD);

	}

for which I wrote a bundle class and I registered it and published as shown below. Now in the same code (Bbii Yii 1.x code) I have:


/**

	 * Retrieve url of image in the assets

	 * @param string filename of the image

	 * @return string source URL of image

	 */

	public function getRegisteredImage($filename) {

		return $this->getAssetsUrl() .'/images/'. $filename;

	}

So I have re-written code as


public function registerAssets() 

	{

    	$this->bundleInstance = \frontend\modules\bbii\BbiiAsset::register(\Yii::$app->view);

    	$this->bundleInstance->publish(\Yii::$app->assetManager);

 	}

	

	public function getRegisteredImage($filename) {

    	return $this->bundleInstance->baseUrl .'/images/'. $filename;

	}

But I get the frontend/web path from


$this->bundleInstance->baseUrl

instead of module path or at least assets path

I believe am doing something wrong here and would like to know what it is. So any help is appreciated!

TIA,

Steve