<?php

class SessionRDFReader
{
    protected $model;

    protected $sessionUID;
    protected $filePath;

    public function __construct($sessionUID)
    {
        // Create empty MemModel
        $factory = new ModelFactory();
        $this->model = $factory->getDefaultModel();

        $this->sessionUID = $sessionUID;
        $this->filePath = 'data/sessions/session_'.$this->surveyUID.'.rdf';
    }

    public function loadSurvey()
    {
        $this->model->load($this->filePath);
    }
    
    public function getSessionInfo()
    {        
        $results[] = $this->readSessionInfo();
        $results[] = $this->getPipeline();
        
        return $results;
    }
    
    public function readSessionInfo()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?uid ?title ?description ?creator
            WHERE 	
            {
                    _session	predicates:resource_type	resources:session ;
                                predicates:uid			?uid	;
                                predicates:title 		?title 	;
                                predicates:description		?description 
            }';

        $result = $this->model->sparqlQuery($querystring);

        return $result;
    }
    
    public function getPipeline()
    {
        $results[] = $this->readSurveys();
        $results[] = $this->readApplications();
        $results[] = $this->readDashboards();
        
        return $results;
    }
    
    public function readSurveys()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT DISTINCT ?uid ?index
            WHERE 	
            {
                    _survey	predicates:resource_type	resources:survey ;
                                predicates:uid			?uid	;
                                predicates:index		?index 
            }';

        $result = $this->model->sparqlQuery($querystring);

        return $result;
    }
    
    public function readApplications()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT DISTINCT ?uid ?index
            WHERE 	
            {
                    _application	predicates:resource_type	resources:application ;
                                predicates:uid			?uid	;
                                predicates:index		?index 
            }';

        $result = $this->model->sparqlQuery($querystring);

        return $result;
    }
    
    public function readDashboards()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT DISTINCT ?uid ?index
            WHERE 	
            {
                    _dashboard	predicates:resource_type	resources:dashboard ;
                                predicates:uid			?uid	;
                                predicates:index		?index 
            }';

        $result = $this->model->sparqlQuery($querystring);

        return $result;
    }
    
    public function getSessionTitleByID($sessionID)
    {
        // Create empty MemModel
        $factory = new ModelFactory();
        $tempmodel= $factory->getDefaultModel();
        $tempmodel->load('data/sessions/session_'.$sessionID.'/session_'.$sessionID.'.rdf');

        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?title 
            WHERE 	
            {
                    _session    predicates:resource_type	resources:session ;
                                predicates:title 		?title 	
            }';

        $result = $tempmodel->sparqlQuery($querystring);

        return $result;
    }
}

?>