<?php
// Survey database interface class as intermediate for storing data from the site to the RDF database 
require_once 'rdfConstants.php';

// Include RAP Library to write RDF files
include(RDFAPI_INCLUDE_DIR . "RDFAPI.php");



class SurveyDatabaseInterface
{		
	protected $surveyRDFWriter;
	protected $surveyRDFReader;
 

    public function __construct($surveyID)
    {
		if($surveyID == null)
			$surveyUID = md5( uniqid(rand(), true) );
		else
			$surveyUID = $surveyID;
					
		$this->surveyRDFWriter = new SurveyRDFWriter($surveyUID);
		$this->surveyRDFReader = new SurveyRDFReader($surveyUID);
    }
	
	public function setSurveyInfo($survey)
	{
		$sTitle = $survey['surveyTitle'];
		$sDescription = $survey['surveyDescription'];
		
		$this->surveyRDFWriter->createSurvey($sTitle,$sDescription);
		
		$qNumber = 1;
		while (isset($survey['questionTitle'.$qNumber]))
		{
			$qTitle = $survey['questionTitle'.$qNumber];
			$qDescription = $survey['questionDescription'.$qNumber];
			$qType = $survey['questionType'.$qNumber];
			if (isset($survey['questionID'.$qNumber]))
				$qID = $survey['questionID'.$qNumber];
			else
				$qID = md5( uniqid(rand(), true) );
			
			$qAnswers = array();
			$aNumber = 1;
			while (isset($survey['q'.$qNumber.'ans'.$aNumber]))
			{
				$aArray = array();
				$aArray['Title'] = $survey['q'.$qNumber.'ans'.$aNumber];
				$aArray['Description'] = 'answerDescription'.$aNumber;
				$qAnswers[] = $aArray;
				
				$aNumber++;
			}
			
			$this->surveyRDFWriter->addQuestion($qTitle,$qDescription,$qType,$qID,$qAnswers);
			
			$qNumber++;
		}

		$this->surveyRDFWriter->saveSurvey();
	}
	
	public function getSurveyInfo()
	{
		$surveyInfo = array();
		
		$resultSurvey = $this->surveyRDFReader->getSurveyInfo();
		
		$surveyInfo['surveyID'] = substr($resultSurvey[0][0]['?uid'],9,strlen($resultSurvey[0][0]['?uid'])-11);
		$surveyInfo['surveyTitle'] = substr($resultSurvey[0][0]['?title'],9,strlen($resultSurvey[0][0]['?title'])-11);
		$surveyInfo['surveyDescription'] = substr($resultSurvey[0][0]['?description'],9,strlen($resultSurvey[0][0]['?description'])-11);
									
		for($qNumber = 1;$qNumber<=sizeof($resultSurvey[1][0]);$qNumber++)
		{
			$surveyInfo['questionID'.$qNumber] = substr($resultSurvey[1][3][$qNumber-1]['?questionID'],9,strlen($resultSurvey[1][3][$qNumber-1]['?questionID'])-11);
			$surveyInfo['questionTitle'.$qNumber] = substr($resultSurvey[1][0][$qNumber-1]['?questionTitle'],9,strlen($resultSurvey[1][0][$qNumber-1]['?questionTitle'])-11);
			$surveyInfo['questionDescription'.$qNumber] = substr($resultSurvey[1][1][$qNumber-1]['?questionDescription'],9,strlen($resultSurvey[1][1][$qNumber-1]['?questionDescription'])-11);
			$surveyInfo['questionType'.$qNumber] = substr($resultSurvey[1][2][$qNumber-1]['?questionType'],9,strlen($resultSurvey[1][2][$qNumber-1]['?questionType'])-11);
						
			$resultAnswers = $this->surveyRDFReader->readSurveyAnswers($surveyInfo['questionID'.$qNumber]);
						
			if ($resultAnswers != null)
			{
				for($aNumber = 1;$aNumber<=sizeof($resultAnswers);$aNumber++)
				{
					$surveyInfo['q'.$qNumber.'ans'.$aNumber] = substr($resultAnswers[$aNumber-1]['?answerTitle'],9,strlen($resultAnswers[$aNumber-1]['?answerTitle'])-11);
				}
			}
		}
		
		return $surveyInfo;
	}

	public function getExistingSurveys()
	{
		$surveyIDs = array();
		$surveys = array();
	
		if($handle = opendir('surveys/'))
		{
			while (false !== ($file = readdir($handle))) {
				if(strstr($file, 'survey_'))
					$surveyIDs[] = substr($file,7,strlen($file)-11);
			}
		}
		
		foreach($surveyIDs as $surveyID)
		{
			$surveyTitle = $this->surveyRDFReader->getSurveyTitleByID($surveyID);
			$surveys[$surveyID] = substr($surveyTitle[0]['?title'],9,strlen($surveyTitle[0]['?title'])-11);
		}
		
		return $surveys;
	}
	
}
?>