<?php

class DashboardRDFReader
{
    protected $model;

    protected $dashboardID;
    protected $filePath;

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

        $this->dashboardID = $dashboardID;
        $this->filePath = 'data/dashboards/dashboard_'.$this->dashboardID.'.rdf';
    }
    
    public function loadDashboard()
    {
        if(file_exists($this->filePath))
        {
            $this->model->load($this->filePath);
            return true;
        }
        else
        {
            return false;
        }
    }
    
    public function getDashboardInfo()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?uid ?title ?description ?creator
            WHERE 	
            {
                    _dashboard	predicates:resource_type	resources:dashboard ;
                                predicates:uid			?uid	;
                                predicates:title 		?title 	;
                                predicates:description		?description ;
                                predicates:creator		?creator
            }';

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

        return $result;
    }
    
    public function readDashboardGraphs()
    {
        $result = array();
        $result[] = $this->readSDashboardGraphsTitle();				
        $result[] = $this->readDashboardGraphsDescription();

        return $result;
    }

    public function readDashboardGraphsTitle()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?graphTitle
            WHERE 
            {	
                    _graph	predicates:resource_type	resources:graph ;
                                predicates:title		?graphTitle 		
            }';

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

        return $result;
    }

    public function readDashboardGraphsDescription()
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?graphDescription
            WHERE 
            {	
                    _graph	predicates:resource_type	resources:graph ;
                                predicates:description		?graphDescription 		
            }';

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

        return $result;
    }

    public function readDashboardGraphsID()
    {
        $querystring = '
            PREFIX 	predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX	resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT 	?graphID
            WHERE 
            {	
                    _graph	predicates:resource_type	resources:graph ;
                                predicates:uid			?graphID				
            }';

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

        return $result;
    }

    public function readGraphTypes($graphID)
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?type
            WHERE 
            {
                    _graph	predicates:resource_type	resources:graph ;
                                predicates:uid			"' . $graphID . '"  ;
                                predicates:graph_type		?type
            }';

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

        return $result;
    }
    
    public function readGraphData($graphID)
    {
        $querystring = '
            PREFIX  predicates: <' . SURVEYTOOL_PREDICATES_NAMESPACE . '>
            PREFIX  resources: <' . SURVEYTOOL_RESOURCES_NAMESPACE . '>
            SELECT  ?datatype ?dataid
            WHERE 
            {
                    _graph	predicates:resource_type	resources:graph ;
                                predicates:uid			"' . $graphID . '"  .
                    _data       predicates:has_data             resources:data  ;
                                predicates:data_type		?datatype   ;
                                predicates:uid                  ?dataid
            }';

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

        return $result;
    }
}
?>