<?php

class SurveyAnswerRDFWriter
{
    protected $surveyID;
    protected $respondentID;
    protected $path;

    public function __construct($surveyID,$sessionID,$respondentID)
    {
        // Create empty MemModel
        $factory = new ModelFactory();
        $this->model = $factory->getDefaultModel();
        
        $basePath = 'data/sessions/';
        $sessionPath = $basePath . $sessionID . '/';
        $this->path  = $sessionPath .'survey_'.$surveyID . '/';
        $this->surveyID = $surveyID;
        $this->respondentID = $respondentID;
        
        if (!is_dir($basePath))
            mkdir($basePath);
        if (!is_dir($sessionPath))
             mkdir($sessionPath);
        if (!is_dir($this->path))
              mkdir($this->path);
        if(file_exists($this->path.'/answer_'.$this->respondentID.'.rdf'))
            $this->model->load($this->path.'/answer_'.$this->respondentID.'.rdf');
    }

    public function saveSurveyData()
    {
        $this->model->saveAs($this->path.'/answer_'.$this->respondentID.'.rdf','rdf');
    }

    public function setRespondentData($name)
    {				
        $resourceUser = new Resource(USER . '/' . $this->respondentID);		

        $resourceUserType = new Resource(USER);
        $predicateRType = new Resource(RTYPE);
        $this->model->add(new Statement($resourceUser,$predicateRType,$resourceUserType));

        $literalUserName = new Literal($name);
        $predicateName = new Resource(NAME);
        $this->model->add(new Statement($resourceUser,$predicateName,$literalUserName));		

        $literalUserID = new Literal($this->respondentID);
        $predicateUniqueID = new Resource(UID);
        $this->model->add(new Statement($resourceUser,$predicateUniqueID,$literalUserID));

        $resourceSurvey = new Resource(SURVEY.'/'.$this->surveyID);
        $predicateRespondent = new Resource(RESPONDENT);
        $this->model->add(new Statement($resourceSurvey,$predicateRespondent,$resourceUser));
    }

    public function setAnswers($answers)
    {
        foreach($answers as $questionID => $answerValues)
        {
            $resourceQuestion = new Resource(QUESTION.'/'.$questionID);

            $resourceQuestionType = new Resource(QUESTION);
            $predicateRType = new Resource(RTYPE);
            $this->model->add(new Statement($resourceQuestion,$predicateRType,$resourceQuestionType));
            
            foreach($answerValues as $answerValue)
            {
                $predicateAnswered = new Resource(ANSWERED);	
                $answer = new Literal($answerValue);
                $this->model->add(new Statement($resourceQuestion,$predicateAnswered,$answer));
            }
        }
    }
}

?>