Wizflow - The Controller

class WizflowController extends \yii\web\Controller
{

	public function beforeAction($action)
	{
		if (parent::beforeAction($action)) {
			Yii::setAlias('@workflowDefinitionNamespace','app\\models\\wizflow');
			Yii::$app->set('workflowSource',[
				'class' => '\raoul2000\workflow\source\file\WorkflowFileSource'
			]);
		}
		return true;
	}

	/**
	 * 
	 * @param string $nav
	 * @throws Exception
	 * @return Ambigous <string, string>
	 */
    public function actionIndex($nav = 'next')
    {
    	$wizard = new WizflowManager([
    		'workflowSource' => Yii::$app->get('workflowSource')
    	]);
    	
    	if( $nav == 'prev') {
    		$model = $wizard->getPreviousStep();
    		if( $model == null) {
    			$this->redirect(['index','nav'=>'start']);
    		}
    	}elseif($nav == 'start') {
    		$model = $wizard->start();
    	}else {

    		$model = $wizard->getCurrentStep();
    		
	    	if( $model->load(Yii::$app->request->post()) && $model->validate()) {
	    		
	    		$wizard->updateCurrentStep($model);
	    		// current step has been completed : save it and get next step
	    		$model = $wizard->getNextStep();
	    		if( $model == null) {
	    			//we reached the last step
	    			$wizard->save();
	    			$this->redirect(['finish']);
	    		} 
	    	}     		
    	}
    	$viewname = $model->getWorkflowStatus()->getMetadata('view');
    	$wizard->save();
        return $this->render($viewname,[
        	'model' => $model,
        	'path'  => $wizard->getPath()
        ]);
    }
    
    /**
     * 
     * @return Ambigous <string, string>
     */
    public function actionFinish()
    {
    	$wizard = new WizflowManager([
    		'workflowSource' => Yii::$app->get('workflowSource')
    	]);
    	return $this->render('finish',[
    		'path' => $wizard->getPath()
    	]);    	
    }

}