<?php
// $Id:
/*
==============================================================================
	Dokeos - elearning and course management software

    Copyright (c) 2009 Dokeos SPRL
    Copyright (c) 2008 Furio Petrossi	

	For a full list of contributors, see "credits.txt".
	The full license can be read in "license.txt".

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	See the GNU General Public License for more details.

	Contact: Dokeos, rue du Corbeau, 108, B-1030 Brussels, Belgium, info@dokeos.com
==============================================================================
*/
/**
==============================================================================
*	This is the tracking library for Dokeos.
*	Include/require it in your code to use its functionality.
*
*	@package dokeos.library
==============================================================================

* Calculates the time spent on the course
* @param integer $user_id the user id
* @param string $course_code the course code
*	Funzione scritta da Mario per testare cose 
*/
$language_file = array ('registration', 'index', 'tracking');
require_once('../inc/global.inc.php');


/**
 * Gets the connections to a course as an array of login and logout time
 */	 
function get_connections_to_course($user_id, $course_code) {
    $course_code = Database::escape_string($course_code);
    
    $tbl_track_course = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
    $tbl_main=Database::get_main_table(TABLE_MAIN_COURSE);
    $sql_query='SELECT visual_code as course_code FROM '.$tbl_main.' c WHERE code="'.$course_code.'";';
    $result=api_sql_query($sql_query,__FILE__,__LINE__);
    $row_query=Database::fetch_array($result,'ASSOC');
    $course_true=isset($row_query['course_code']) ? $row_query['course_code']: $course_code;

    $sql = 'SELECT login_course_date, logout_course_date FROM ' . $tbl_track_course . ' 
    				WHERE user_id = ' . intval($user_id) . '
    				AND course_code="' . $course_true . '" ORDER BY login_course_date DESC';
    
    $rs = api_sql_query($sql);
    $connections  = array();
    
    while ($a_connections = Database::fetch_array($rs)) {
    
        $s_login_date = $a_connections['login_course_date'];
        $s_logout_date = $a_connections['logout_course_date'];
        
        $i_timestamp_login_date = strtotime($s_login_date);
        $i_timestamp_logout_date = strtotime($s_logout_date);
        
        $connections[] = array('login'=>$i_timestamp_login_date, 'logout'=>$i_timestamp_logout_date);
        
    }
    
    return $connections;
}


function get_connections_to_course_by_time($user_id, $course_code, $year='', $month='', $day='') {
    $course_code = Database::escape_string($course_code);    
    $tbl_track_course = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
    $tbl_main=Database::get_main_table(TABLE_MAIN_COURSE);
    $sql_query='SELECT visual_code as course_code FROM '.$tbl_main.' c WHERE code="'.$course_code.'";';
    $result=api_sql_query($sql_query,__FILE__,__LINE__);
    $row_query=Database::fetch_array($result,'ASSOC');
    $course_true=isset($row_query['course_code']) ? $row_query['course_code']: $course_code;

    $sql = 'SELECT login_course_date, logout_course_date FROM ' . $tbl_track_course . ' 
    				WHERE user_id = ' . intval($user_id) . '
    				AND course_code="' . $course_true . '"    				 
    				ORDER BY login_course_date DESC';
    
    $rs = api_sql_query($sql);
    $connections  = array();    
    while ($a_connections = Database::fetch_array($rs)) {    
        $s_login_date = $a_connections['login_course_date'];
        $s_logout_date = $a_connections['logout_course_date'];        
        $i_timestamp_login_date = strtotime($s_login_date);
        $i_timestamp_logout_date = strtotime($s_logout_date);        
        $connections[] = array('login'=>$i_timestamp_login_date, 'logout'=>$i_timestamp_logout_date);        
    }    
    return $connections;
}

	
/**
 * Transforms seconds into a time format
 */
function calculHours($seconds)
{	
  //How many hours ?
  $hours = floor($seconds / 3600);

  //How many minutes ?
  $min = floor(($seconds - ($hours * 3600)) / 60);
  if ($min < 10)
    $min = '0'.$min;

  //How many seconds
  $sec = $seconds - ($hours * 3600) - ($min * 60);
  if ($sec < 10)
    $sec = '0'.$sec;

  return $hours.get_lang('HourShort').' '.$min.':'.$sec;

}

/* MAIN */

$user_id = Database::escape_string($_REQUEST['student']);
$course_code=Database::escape_string($_REQUEST['course']);

include_once(api_get_path(LIBRARY_PATH).'pchart/pData.class.php');
include_once(api_get_path(LIBRARY_PATH).'pchart/pChart.class.php');
include_once(api_get_path(LIBRARY_PATH).'pchart/pCache.class.php');
$connections = get_connections_to_course($user_id, $course_code);
$i = 0;		
if (api_is_xml_http_request()) {
	$type  = $_GET['type'];	
	$main_year = $main_month_year = $main_day = array();
	foreach ($connections as $key=>$data) {				
		//creating the main array		
		$main_year[date('Y',$data['login'])]+=calculHours($data['logout']-$data['login'])*60;	
		$main_month_year[date('m-Y',$data['login'])]+=calculHours($data['logout']-$data['login'])*60;
		$main_day[date('d-m-Y',$data['login'])]+=calculHours($data['logout']-$data['login'])*60;
			
		if ($i > 500) {
			break;
		}
		$i++;
	}	 
	switch ($type) {
		case 'day':
		$main_date = $main_day;
		break;
		case 'month':
		$main_date = $main_month_year ;						
		break;
		case 'year':
		$main_date = $main_year;
		break;
	}
	
	//echo '<pre>'; print_r($main_date);
	// the nice graphics :D
	$labels = array_keys($main_date);	
	if (count($main_date)==1) {
		$labels = $labels[0];
		$main_date = $main_date[$labels];
	}
	
	$DataSet = new pData;	
	$DataSet->AddPoint($main_date,'Q');
	if (count($main_date)!=1) {
		$DataSet->AddPoint($labels,'Date');
	}
	$DataSet->AddAllSeries();  
	$DataSet->RemoveSerie('Date');  
	$DataSet->SetAbsciseLabelSerie('Date');
	$DataSet->SetYAxisName(get_lang('Minutes'));  
	$graph_id = api_get_user_id().'AccessDetails'.api_get_course_id();
	$DataSet->AddAllSeries();
	
	$Cache = new pCache();
	// the graph id
	$data = $DataSet->GetData();
	
	if ($Cache->IsInCache($graph_id, $DataSet->GetData())) {
	//if (0) {
		//if we already created the img
		//	echo 'in cache';
		$img_file = $Cache->GetHash($graph_id,$DataSet->GetData());			
	} else  {		  
	// if the image does not exist in the main/garbage/ folder		
		// Initialise the graph  
		$Test = new pChart(760,230);
		 
		//which schema of color will be used
		$quant_resources = count($data[0])-1;					
		// Adding the color schemma
		$Test->loadColorPalette(api_get_path(LIBRARY_PATH)."pchart/palette/default.txt");
								
	  	$Test->setFontProperties(api_get_path(LIBRARY_PATH)."pchart/fonts/tahoma.ttf",8);     
	  	$Test->setGraphArea(70,30,680,200);     
	  	$Test->drawFilledRoundedRectangle(7,7,693,223,5,240,240,240);     
	  	$Test->drawRoundedRectangle(5,5,695,225,5,230,230,230);     
	  	$Test->drawGraphArea(255,255,255,TRUE);  
	  	$Test->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),SCALE_START0,150,150,150,TRUE,0,0);     
	  	$Test->drawGrid(4,TRUE,230,230,230,50);  
	    $Test->setLineStyle(2); 
		// Draw the 0 line     
		$Test->setFontProperties(api_get_path(LIBRARY_PATH)."pchart/fonts/tahoma.ttf",6);     
		$Test->drawTreshold(0,143,55,72,TRUE,TRUE);
		
	  	if (count($main_date)==1) {
			//Draw a graph 
			echo '<strong>'.$labels.'</strong><br/>';			
  			$Test->drawBarGraph($DataSet->GetData(),$DataSet->GetDataDescription(),TRUE);
	  	} else {
			//Draw the line graph  
			$Test->drawLineGraph($DataSet->GetData(),$DataSet->GetDataDescription());     
			$Test->drawPlotGraph($DataSet->GetData(),$DataSet->GetDataDescription(),3,2,255,255,255);
 		}
	  
		// Finish the graph     
		$Test->setFontProperties(api_get_path(LIBRARY_PATH)."pchart/fonts/tahoma.ttf",8);     
		       
		$Test->setFontProperties(api_get_path(LIBRARY_PATH)."pchart/fonts/tahoma.ttf",10);     
		$Test->drawTitle(60,22,get_lang('AccessDetails'),50,50,50,585);    
		
		//------------------						
		//echo 'not in cache';			
		$Cache->WriteToCache($graph_id,$DataSet->GetData(),$Test);						
		ob_start();
		$Test->Stroke();
		ob_end_clean();				
		$img_file = $Cache->GetHash($graph_id,$DataSet->GetData());		
	}	
	echo '<img src="'.api_get_path(WEB_CODE_PATH).'garbage/'.$img_file.'">';
	exit;
}

$nameTools= get_lang('AccessDetails');
$interbreadcrumb[] = array ("url" => "../user/user.php?cidReq=".$_GET['course'], "name" => get_lang("Users"));
$interbreadcrumb[] = array ("url" => "myStudents.php?cidReq=".$_GET['course']."&student=".$_GET['student']."&details=true&origin=user_course", "name" => get_lang('DetailsStudentInCourse'));

$htmlHeadXtra[] = '<script src="../inc/lib/javascript/jquery.js" type="text/javascript" language="javascript"></script>'; //jQuery
$htmlHeadXtra[] = '<script src="../inc/lib/javascript/jquery-1.1.3.1.pack.js" type="text/javascript"></script>';
$htmlHeadXtra[] = '<script src="../inc/lib/javascript/jquery.history_remote.pack.js" type="text/javascript"></script>';
$htmlHeadXtra[] = '<script src="../inc/lib/javascript/jquery.tabs.pack.js" type="text/javascript"></script>';
$htmlHeadXtra[] = '<link rel="stylesheet" href="../inc/lib/javascript/jquery.tabs.css" type="text/css" media="print, projection, screen">';

$htmlHeadXtra[] = '<script type="text/javascript">
$(function() {
	$("#container-9").tabs({ remote: true});	     
});
		
</script>'  ;

Display :: display_header($nameTools);
$TBL_USERINFO_DEF 		= Database :: get_course_table(TABLE_USER_INFO);
$mainUserInfo = api_get_user_info($user_id, $course_code);

$result_to_print = '';
$main_date_array = array();
foreach ($connections as $key=>$data) { 
	$result_to_print .= '&nbsp;&nbsp;'.date('d-m-Y (H:i:s)',$data['login']).' - '.calculHours($data['logout']-$data['login']).'<br />'."\n";	
}

echo '<strong>',get_lang('User'),': ',$mainUserInfo['firstName'],' ',$mainUserInfo['lastName'],'</strong> <br />';
echo '<strong>'.get_lang('Course').': ',$course_code,'</strong><br /><br />';

?>
<div id="container-9">
    <ul>                
        <li><a href="access_details.php?type=day&course=<?php echo $course_code?>&student=<?php echo $user_id?>"><span> <?php echo get_lang('Day'); ?></span></a></li>
        <li><a href="access_details.php?type=month&course=<?php echo $course_code?>&student=<?php echo $user_id?>"><span><?php echo get_lang('Month'); ?></span></a></li>
        <li><a href="access_details.php?type=year&course=<?php echo $course_code?>&student=<?php echo $user_id?>"><span> <?php echo get_lang('Year'); ?></span></a></li>
    </ul>
    <?php echo '<div id="show"></div>';?>
</div>
<?php

echo '<div id="graph"></div><br />';
echo '<strong>',get_lang('DateAndTimeOfAccess'),' - ',get_lang('Duration'),'</strong><br /><br />';
echo $result_to_print;

/* Login time against logout time
foreach ($connections as $key=>$data)
{
    echo ("<tr><td>".date("d-m-Y (H:i:s)",$data['login'])."</td><td>".date("d-m-Y (H:i:s)",$data['logout'])."</td></tr>"); 
}
*/
/*
foreach ($connections as $key=>$data)
{
    echo ("<tr><td>".date("d-m-Y (H:i:s)",$data['login'])."</td><td>".calculHours($data['logout']-$data['login'])."</td></tr>"); 
}
echo ("</table>");
*/
Display:: display_footer();
?>