<?php //$id$
/**
 * This script contains the server part of the xajax interaction process. The client part is located
 * in lp_api.php or other api's.
 * This is a first attempt at using xajax and AJAX in general, so the code might be a bit unsettling.
 * @package dokeos.learnpath
 * @author Yannick Warnier <ywarnier@beeznest.org>
 */
/**
 * Script
 */
//flag to allow for anonymous user - needs to be set before global.inc.php
$use_anonymous = true;
// name of the language file that needs to be included 
$language_file[] = 'learnpath';
require_once('back_compat.inc.php');
/**
 * Get one item's details
 * @param   integer LP ID
 * @param   integer user ID
 * @param   integer View ID
 * @param   integer Current item ID
 * @param   integer New item ID
 */
function switch_item_details($lp_id,$user_id,$view_id,$current_item,$next_item)
{
    $debug=0;
    $return = '';
    if($debug>0){error_log('In xajax_switch_item_details('.$lp_id.','.$user_id.','.$view_id.','.$current_item.','.$next_item.')',0);}
    //$objResponse = new xajaxResponse();
    /*$item_id may be one of:
     * -'next'
     * -'previous'
     * -'first'
     * -'last'
     * - a real item ID
     */
    require_once('learnpath.class.php');
    require_once('scorm.class.php');
    require_once('aicc.class.php');
    require_once('learnpathItem.class.php');
    require_once('scormItem.class.php');
    require_once('aiccItem.class.php');
    $mylp = '';
    if(isset($_SESSION['lpobject']))
    {
        if($debug>1){error_log('////$_SESSION[lpobject] is set',0);}
        $oLP =& unserialize($_SESSION['lpobject']);
        if(!is_object($oLP)){
            if($debug>1){error_log(print_r($oLP,true),0);}
            if($debug>2){error_log('////Building new lp',0);}
            unset($oLP);
            $code = api_get_course_id();
            $mylp = & new learnpath($code,$lp_id,$user_id);
        }else{
            if($debug>1){error_log('////Reusing session lp',0);}
            $mylp = & $oLP;
        }
    }
    $new_item_id = 0;
    switch($next_item){
        case 'next':
            $mylp->set_current_item($current_item);
            $mylp->next();
            $new_item_id = $mylp->get_current_item_id();
            if($debug>1){error_log('In {next} - next item is '.$new_item_id.'(current: '.$current_item.')',0);}
            break;
        case 'previous':
            $mylp->set_current_item($current_item);
            $mylp->previous();
            $new_item_id = $mylp->get_current_item_id();            
            if($debug>1){error_log('In {previous} - next item is '.$new_item_id.'(current: '.$current_item.')',0);}
            break;
        case 'first':
            $mylp->set_current_item($current_item);
            $mylp->first();
            $new_item_id = $mylp->get_current_item_id();
            if($debug>1){error_log('In {first} - next item is '.$new_item_id.'(current: '.$current_item.')',0);}
            break;
        case 'last':
            break;
        default:
            //should be filtered to check it's not hacked
            if($next_item == $current_item){
                //if we're opening the same item again
                $mylp->items[$current_item]->restart();
            }
            $new_item_id = $next_item;
            $mylp->set_current_item($new_item_id);
            if($debug>1){error_log('In {default} - next item is '.$new_item_id.'(current: '.$current_item.')',0);}
            break;
    }
    $mylp->start_current_item(true);
    if($mylp->force_commit){
        $mylp->save_current();
    }
    //$objResponse->addAlert(api_get_path(REL_CODE_PATH).'newscorm/learnpathItem.class.php');
    if(is_object($mylp->items[$new_item_id])){
        $mylpi = & $mylp->items[$new_item_id];
    }else{
        if($debug>1){error_log('In switch_item_details - generating new item object',0);}
        $mylpi =& new learnpathItem($new_item_id,$user_id);
        $mylpi->set_lp_view($view_id);
    }
    /*
     * now get what's needed by the SCORM API:
     * -score
     * -max
     * -min
     * -lesson_status
     * -session_time
     * -suspend_data
     */
    $myscore = $mylpi->get_score();
    $mymax = $mylpi->get_max();
    if($mymax===''){$mymax="''";}
    $mymin = $mylpi->get_min();
    $mylesson_status = $mylpi->get_status();
    $mylesson_location = $mylpi->get_lesson_location();
    $mytotal_time = $mylpi->get_scorm_time('js');
    $mymastery_score = $mylpi->get_mastery_score();
    $mymax_time_allowed = $mylpi->get_max_time_allowed();
    $mylaunch_data = $mylpi->get_launch_data();
    /*
    if($mylpi->get_type() == 'asset'){
        //temporary measure to save completion of an asset. Later on, Dokeos should trigger something on unload, maybe... (even though that would mean the last item cannot be completed)
        $mylesson_status = 'completed';
        $mylpi->set_status('completed');
        $mylpi->save();
    }
    */
    $mysession_time = $mylpi->get_total_time();
    $mysuspend_data = $mylpi->get_suspend_data();
    $mylesson_location = $mylpi->get_lesson_location();
    $myic = $mylpi->get_interactions_count();
    $myistring = '';
    for ($i=0;$i<$myic;$i++) {
    	$myistring .= ",[".$i.",'','','','','','','']";
    }
    if (!empty($myistring)) {
        $myistring = substr($myistring,1);
    }
    //$objResponse->addScript(
    $return .=
            "score=".$myscore.";" .
            "max=".$mymax.";" .
            "min=".$mymin.";" .
            "lesson_status='".$mylesson_status."';" .
            "lesson_location='".$mylesson_location."';" .
            "session_time='".$mysession_time."';" .
            "suspend_data='".$mysuspend_data."';" .
            "total_time = '".$mytotal_time."';" .
            "mastery_score = '".$mymastery_score."';" .
            "max_time_allowed = '".$mymax_time_allowed."';" .
            "launch_data = '".$mylaunch_data."';" .
            "interactions = new Array(".$myistring.");" .
            "item_objectives = new Array();" .
            "G_lastError = 0;" .
            "G_LastErrorMessage = 'No error';";
            //);
    /*
     * and re-initialise the rest
     * -saved_lesson_status = 'not attempted'
     * -lms_lp_id
     * -lms_item_id
     * -lms_old_item_id
     * -lms_new_item_id
     * -lms_been_synchronized
     * -lms_initialized
     * -lms_total_lessons
     * -lms_complete_lessons
     * -lms_progress_bar_mode
     * -lms_view_id
     * -lms_user_id
     */
    $mytotal = $mylp->get_total_items_count_without_chapters();
    $mycomplete = $mylp->get_complete_items_count();
    $myprogress_mode = $mylp->get_progress_bar_mode();
    $myprogress_mode = ($myprogress_mode==''?'%':$myprogress_mode);
    $mynext = $mylp->get_next_item_id();
    $myprevious = $mylp->get_previous_item_id();
    $myitemtype = $mylpi->get_type();
    $mylesson_mode = $mylpi->get_lesson_mode();
    $mycredit = $mylpi->get_credit();
    $mylaunch_data = $mylpi->get_launch_data();
    $myinteractions_count = $mylpi->get_interactions_count();
    $myobjectives_count = $mylpi->get_objectives_count();
    $mycore_exit = $mylpi->get_core_exit();
    
    //$objResponse->addScript(
    $return .=
            "saved_lesson_status='not attempted';" .
            "lms_lp_id=".$lp_id.";" .
            "lms_item_id=".$new_item_id.";" .
            "lms_old_item_id=0;" .
            "lms_been_synchronized=0;" .
            "lms_initialized=0;" .
            "lms_total_lessons=".$mytotal.";" .
            "lms_complete_lessons=".$mycomplete.";" .
            "lms_progress_bar_mod='".$myprogress_mode."';" .
            "lms_view_id=".$view_id.";" .
            "lms_user_id=".$user_id.";" .
            "next_item=".$new_item_id.";" . //this one is very important to replace possible literal strings
            "lms_next_item=".$mynext.";" .
            "lms_previous_item=".$myprevious.";" .
            "lms_item_type = '".$myitemtype."';" .
            "lms_item_credit = '".$mycredit."';" .
            "lms_item_lesson_mode = '".$mylesson_mode."';" .
            "lms_item_launch_data = '".$mylaunch_data."';" .
            "lms_item_interactions_count = '".$myinteractions_count."';" .
            "lms_item_objectives_count = '".$myinteractions_count."';" .
            "lms_item_core_exit = '".$mycore_exit."';" .
            "asset_timer = 0;";
            //);
    //$objResponse->addScript("update_toc('unhighlight','".$current_item."');");
    //$objResponse->addScript("update_toc('highlight','".$new_item_id."');");
    //$objResponse->addScript("update_toc('$mylesson_status','".$new_item_id."');");
    //$objResponse->addScript("update_progress_bar('$mycomplete','$mytotal','$myprogress_mode');");
    $return .= "update_toc('unhighlight','".$current_item."');".
            "update_toc('highlight','".$new_item_id."');".
            "update_toc('$mylesson_status','".$new_item_id."');".
            "update_progress_bar('$mycomplete','$mytotal','$myprogress_mode');";

    $mylp->set_error_msg('');
    $mylp->prerequisites_match(); //check the prerequisites are all complete
    if($debug>1){error_log('Prereq_match() returned '.htmlentities($mylp->error),0);}
    //$objResponse->addScript("update_message_frame('".str_replace("'","\'",htmlentities($mylp->error))."');");
    $return .= "update_message_frame('".str_replace("'","\'",api_htmlentities($mylp->error, ENT_QUOTES, api_get_system_encoding()))."');";
    $_SESSION['scorm_item_id'] = $new_item_id;//Save the new item ID for the exercise tool to use
    $_SESSION['lpobject'] = serialize($mylp);
    return $return;
    //return $objResponse;
}
echo switch_item_details($_GET['lid'],$_GET['uid'],$_GET['vid'],$_GET['iid'],$_GET['next']);