<?php // $Id: $ 
/**
============================================================================== 
*	API event handler functions for AICC / CMIv4 in HACP communication mode
*
*	@author   Denes Nagy <darkden@freemail.hu>
*   @author   Yannick Warnier <ywarnier@beeznest.org>
*	@version  v 1.0
*	@access   public
*	@package  dokeos.learnpath
* 	@license	GNU/GPL - See Dokeos license directory for details
============================================================================== 
*/
/**
 * This script is divided into three sections. 
 * The first section (below) is the initialisation part.
 * The second section is the AICC object part
 * The third section defines the event handlers for Dokeos' internal messaging
 * and frames refresh
 * 
 * This script implements the HACP messaging for AICC. The API messaging is
 * made by another set of scripts.
 * 
 * Rules for HACP processing of one AU
 * Rule #1 The first HACP message issued must be a GetParam
 * Rule #2 The last HACP message issued must be an ExitAU
 * Rule #3 At least one PutParam message must be issued prior to an ExitAU message
 * Rule #4 No HACP messages can be issued after a successfully issued ExitAU message
 * 
 * Only suspend_data and core.lesson_location should be sent updated to a late GetParam
 * request. All other params should be as when the AU was launched.
 */
/*
============================================================================== 
	   INIT SECTION
============================================================================== 
*/ 
$debug = 0;

//flag to allow for anonymous user - needs to be set before global.inc.php
$use_anonymous = true;

//Use session ID as provided by the request
if(!empty($_REQUEST['aicc_sid']))
{
	session_id($_REQUEST['aicc_sid']);
	if($debug>1){error_log('New LP - '.__FILE__.','.__LINE__.' - reusing session ID '.$_REQUEST['aicc_sid'],0);}
}
//Load common libraries using a compatibility script to bridge between 1.6 and 1.8
require_once('back_compat.inc.php');  
if($debug>2){error_log('New LP - '.__FILE__.','.__LINE__.' - Current session ID: '.session_id(),0);}
//Load learning path libraries so we can use the objects to define the initial values
//of the API
require_once('learnpath.class.php');
require_once('learnpathItem.class.php');
require_once('aicc.class.php');

// Is this needed? This is probabaly done in the header file
//$_user							= $_SESSION['_user'];
$file							= $_SESSION['file'];
$oLP							= unserialize($_SESSION['lpobject']);
$oItem 							=& $oLP->items[$oLP->current];
if(!is_object($oItem)){
	error_log('New LP - aicc_hacp - Could not load oItem item',0);
	exit;
}
$autocomplete_when_80pct = 0;

$result = array(
	'core'=>array(),
	'core_lesson'=>array(),
	'core_vendor'=>array(),
	'evaluation'=>array(),
	'student_data'=>array(),
);
$convert_enc = array('%25','%0D','%0A','%09','%20','%2D','%2F','%3B','%3F','%7B','%7D','%7C','%5C','%5E','%7E','%5B','%5D','%60','%23','%3E','%3C','%22');
$convert_dec = array('%',"\r","\n","\t",' ','-','/',';','?','{','}','|','\\','^','~','[',']','`','#','>','<','"');
$crlf = "\r\n";
$tab = "\t";
$s_ec = 'error='; //string for error code
$s_et = 'error_text='; //string for error text
$s_ad = 'aicc_data='; //string for aicc_data

$errors = array(0=>'Successful',1=>'Invalid Command',2=>'Invalid AU password',3=>'Invalid Session ID');

$error_code = 0;
$error_text = '';
$aicc_data = '';
$result = '';
//GET REQUEST
if(!empty($_REQUEST['command']))
{
	//error_log('In '.__FILE__.', '.__LINE__.' - request is '.$_REQUEST['command'],0);
	switch(strtolower($_REQUEST['command']))
	{
		case 'getparam':
			//request for all available data to be printed out in the answer
			if(!empty($_REQUEST['version'])){
				$hacp_version = learnpath::escape_string($_REQUEST['version']);
			}
			if(!empty($_REQUEST['session_id'])){
				$hacp_session_id = learnpath::escape_string($_REQUEST['session_id']);
			}
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			$result .= '[Core]'.$crlf;
			$result .= $tab.'Student_ID='.$_user['user_id'].$crlf;
			$result .= $tab.'Student_Name='.$_user['lastName'].', '.$_user['firstName'].$_user['user_id'].$crlf;
			$result .= $tab.'Lesson_Location='.$oItem->get_lesson_location().$crlf;
			$result .= $tab.'Credit='.$oItem->get_credit().$crlf;
			$result .= $tab.'Lesson_Status='.$oItem->get_status().$crlf;
			$result .= $tab.'Score='.$oItem->get_score().$crlf;
			$result .= $tab.'Time='.$oItem->get_scorm_time('js').$crlf;
			$result .= $tab.'Lesson_Mode='.$oItem->get_lesson_mode().$crlf;
			$result .= '[Core_Lesson]'.$crlf;
			$result .= $oItem->get_suspend_data().$crlf;
			$result .= '[Core_Vendor]'.$crlf;
			$result .= $oItem->get_launch_data.$crlf;
			$result .= '[Comments]'.$crlf;
			$result .= $crlf;
			$result .= '[Evaluation]'.$crlf;
			$result .= $tab.'Course_ID={'.api_get_course_id().'}'.$crlf;
			//$result .= '[Objectives_Status]'.$crlf;
			$result .= '[Student_Data]'.$crlf;
			$result .= $tab.'Mastery_Score='.$oItem->masteryscore.$crlf;
			//$result .= '[Student_Demographics]'.$crlf;
			//$result .= '[Student_Preferences]'.$crlf;
						
			//error_log('Returning message: '.$result,0);
			$result = str_replace($convert_dec,$convert_enc,$result);
			//error_log('Returning message (encoded): '.$result,0);
			break;
		case 'putparam':
			$hacp_version = '';
			$hacp_session_id = '';
			$hacp_aicc_data = '';
			foreach($_REQUEST as $name => $value)
			{
				//escape the value as described in the AICC documentation p170
				switch(strtolower($name))
				{
					case 'version':
						$hacp_version = $value;
						break;
					case 'session_id':
						$hacp_session_id = $value;
						break;
					case 'aicc_data':
						//error_log('In '.__FILE__.', '.__LINE__.' - aicc data before translation is '.$value,0);
						$value = str_replace('+',' ',$value);
						$value = str_replace($convert_enc,$convert_dec,$value);
						$hacp_aicc_data = $value;						
						break;
				}
			}
			//error_log('In '.__FILE__.', '.__LINE__.' - aicc data is '.$hacp_aicc_data,0);
			//treat the incoming request:
			$msg_array = aicc::parse_ini_string_quotes_safe($hacp_aicc_data,array('core_lesson','core_vendor'));
			//error_log('Message is now in this form: '.print_r($msg_array,true),0);
			foreach($msg_array as $key=>$dummy){
				switch (strtolower($key)){
					case 'core':
						foreach($msg_array[$key] as $subkey => $value){
							switch(strtolower($subkey)){
								case 'lesson_location':
									//error_log('Setting lesson_location to '.$value,0);
									$oItem->set_lesson_location($value);
									break;
								case 'lesson_status':
									//error_log('Setting lesson_status to '.$value,0);
									$oItem->set_status($value);
									break;
								case 'score':
									//error_log('Setting lesson_score to '.$value,0);
									$oItem->set_score($value);
									break;
								case 'time':
									//error_log('Setting lesson_time to '.$value,0);
									$oItem->set_time($value);
									break;
							}
						}
						break;
					case 'core_lesson':
						//error_log('Setting suspend_data to '.print_r($msg_array[$key],true),0);
						$oItem->current_data = $msg_array[$key];
						break;
					case 'comments':
						break;
					case 'objectives_status':
						break;
					case 'student_data':
						break;
					case 'student_preferences':
						break;
				}
			}
			
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			$oItem->save(false);
			break;
		case 'putcomments':
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			break;
		case 'putobjectives':
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			break;
		case 'putpath':
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			break;
		case 'putinteractions':
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			break;
		case 'putperformance':
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			break;
		case 'exitau':
			$error_code = 0;
			$error_text = $errors[$error_code];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf.$s_ad.$crlf;
			break;
		default:
			$error_code = 1;
			$error_text = $errors[1];
			$result = $s_ec.$error_code.$crlf.$s_et.$error_text.$crlf;
	}
}
$_SESSION['lpobject'] = serialize($oLP);
//content type must be text/plain
header('Content-type: text/plain');
echo $result;
?>