sequencinglib.php

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				 if($b === false){
					 return false;
				 }
			 }

			 else{

                $val = false;
				 
				if($b == 'unknown'){
					 $unk = true;
				}
				if($b === true){
					return true;
				}
			 }


		}
	}
	if ($unk){
		return 'unknown';
	}
	return $val;

}

function scorm_evaluate_condition ($rolluprulecond,$sco,$userid){
	
	        $res = false;

            switch ($rolluprulecond->cond){
				
				case 'satisfied':
					 if($r=get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','objectivesatisfiedstatus')){
						if($r->value == true){
					        if ($r=get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','objectiveprogressstatus')){
						        if($r->value == true){
					               $res= true;
						        }
				            }
						}
				    }
				break;

				case 'objectiveStatusKnown':
                    if ($r=get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','objectiveprogressstatus')){
						if($r->value == true){
					        $res= true;
						}
				    }
				break;

				case 'objectiveMeasureKnown':
					if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','objectivemeasurestatus')){
					    if($r->value == true){
							$res = true;
						}
	
				    }

				break;

				case 'completed':
					if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','attemptcompletionstatus')){
					    if($r->value){
							if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','attemptprogressstatus')){
					           if($r->value){
							      $res = true;
						       }
	
				            }
						}
	
				    }
				break;

				case 'attempted':
					if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','activityprogressstatus')){
					    if($r->value){
							if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','activityattemptcount')){
					            if($r->value > 0){
							        $res = true;
						        }
	
				            }
						}
	
				    }
				break;
				

				case 'attemptLimitExceeded':
					if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','activityprogressstatus')){
					    if($r->value){
							if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','limitconditionattemptlimitcontrol')){
					            if($r->value){
							       if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','activityattemptcount') && $r2 = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','limitconditionattemptlimit') ){
					                   if($r->value >= $r2->value){
							               $res = true;
						               }
	
				                   }
					
						        }
	
				            }
					
						}
	
				    }
					
				break;

				case 'activityProgressKnown':

					if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','activityprogressstatus')){
					    if($r->value){
					        if ($r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','attemptprogressstatus')){
					            if($r->value){
							        $res = true;
						        }
	
				            }
					
						}
	
				    }
					
				break;
			}
			return $res;

}

function scorm_seq_check_child ($sco, $action, $userid){
	$included = false;
	$sco=scorm_get_sco($sco->id);
	$r = get_record('scorm_scoes_track','scoid',$sco->id,'userid',$userid,'element','activityattemptcount');
	if ($action == 'satisfied' || $action == 'notsatisfied'){
	  if (!$sco->rollupobjectivesatisfied){
		$included = true;
		if (($action == 'satisfied' && $sco->requiredforsatisfied == 'ifnotsuspended') || ($action == 'notsatisfied' && $sco->requiredfornotsatisfied == 'ifnotsuspended')){
			
			if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || ((($r->value)>0)&& !scorm_seq_is('suspended',$sco->id,$userid))){
				$included = false;
			}

		}
		else{
			if (($action == 'satisfied' && $sco->requiredforsatisfied == 'ifattempted') || ($action == 'notsatisfied' && $sco->requiredfornotsatisfied == 'ifattempted')){
			    if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || (($r->value) == 0)){
				    $included = false;
			    }
            }
			else{
				if (($action == 'satisfied' && $sco->requiredforsatisfied == 'ifnotskipped') || ($action == 'notsatisfied' && $sco->requiredfornotsatisfied == 'ifnotskipped')){
					$rulch = scorm_seq_rules_check($sco, 'skip');
					if ($rulch != null){
						$included = false;
					}
			    }
			}
		}
      }
	}
    if ($action == 'completed' || $action == 'incomplete'){
		if (!$sco->rollupprogresscompletion){
		    $included = true;

            if (($action == 'completed' && $sco->requiredforcompleted == 'ifnotsuspended') || ($action == 'incomplete' && $sco->requiredforincomplete == 'ifnotsuspended')){

			    if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || ( (($r->value)>0)&& !scorm_seq_is('suspended',$sco->id,$userid))){
				    $included = false;
			    }

		    }
			else{
				
				if (($action == 'completed' && $sco->requiredforcompleted == 'ifattempted') || ($action == 'incomplete' && $sco->requiredforincomplete == 'ifattempted')){
			        if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || (($r->value)==0)){
				        $included = false;
			        }

		        }
				else{
					if (($action == 'completed' && $sco->requiredforsatisfied == 'ifnotskipped') || ($action == 'incomplete' && $sco->requiredfornotsatisfied == 'ifnotskipped')){
					    $rulch = scorm_seq_rules_check($sco, 'skip');
					    if ($rulch != null){
						    $included = false;
					    }
			        }
				}


			}

		}
	}
    return $included;


}
function scorm_seq_sequencing ($scoid,$userid,$seq) {

    switch ($seq->sequencing) {

        case 'start':
			 $seq = scorm_seq_start_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
			$seq->sequencing = true;
           
			
		    break;
			
        case 'resumeall':
			$seq = scorm_seq_resume_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
			$seq->sequencing = true;
			
		    
          
            break;

        case 'exit':
			 $seq = scorm_seq_exit_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
			$seq->sequencing = true;

           
          
            break;

        case 'retry':
            $seq = scorm_seq_retry_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
            $seq->sequencing = true;
			
          
            break;

		case 'previous':
			$seq = scorm_seq_previous_sequencing($sco,$userid,$seq);// We'll see the parameters we have to send, this should update delivery and end
			$seq->sequencing = true;

         
            break;

		case 'choice':
			$seq = scorm_seq_choice_sequencing($sco,$userid,$seq);// We'll see the parameters we have to send, this should update delivery and end
             $seq->sequencing = true; 
			 
      
		    break;

    }

	if ($seq->exception != null){
		$seq->sequencing = false;
		return $seq;
	}
	
	$seq->sequencing= true;
    return $seq;
}


function scorm_seq_start_sequencing($scoid,$userid,$seq){
	if (!empty($seq->currentactivity)) {
		$seq->delivery = null;
		$seq->exception = 'SB.2.5-1';
		return $seq;
	}
	$sco = get_record('scorm_scoes','scoid',$scoid,'userid',$userid);
	if (($sco->parent == '/') && scorm_is_leaf($sco)) {//if the activity is the root and is leaf
		$seq->delivery = $sco;
	}
	else{
		$ancestors = scorm_get_ancestors($sco);
		$ancestorsroot = array_reverse($ancestors);
		$res = scorm_seq_flow($ancestorsroot[0],'forward',$seq,true,$userid);
		if($res){
			return $res;
		}
		else{
			//return end and exception
		}
	}
}

function scorm_seq_resume_all_sequencing($scoid,$userid,$seq){
	if (!empty($seq->currentactivity)){
		$seq->delivery = null;
		$seq->exception = 'SB.2.6-1';
		return $seq;
	}
	$track = get_record('scorm_scoes_track','scoid',$scoid,'userid',$userid,'element','suspendedactivity');
    if (!$track) {
		$seq->delivery = null;
	    $seq->exception = 'SB.2.6-2';
	    return $seq;
	}
	$seq->delivery = get_record('scorm_scoes','scoid',$scoid,'userid',$userid);//we assign the sco to the delivery
	
}

function scorm_seq_continue_sequencing($scoid,$userid,$seq){
	if (empty($seq->currentactivity)) {
		$seq->delivery = null;
		$seq->exception = 'SB.2.7-1';
		return $seq;
	}
	$currentact= $seq->currentactivity;
	if ($currentact->parent != '/') {//if the activity is the root and is leaf
	    $parent = scorm_get_parent ($currentact);

		 if (!isset($parent->flow) || ($parent->flow == false)) {
			$seq->delivery = null;
	        $seq->exception = 'SB.2.7-2';
	        return $seq;
		}

		$res = scorm_seq_flow($currentact,'forward',$seq,false,$userid);
		if($res){
			return $res;
		}
		else{
			//return end and exception
		}

	}
}

function scorm_seq_previous_sequencing($scoid,$userid,$seq){
	if (empty($seq->currentactivity)) {
		$seq->delivery = null;
		$seq->exception = 'SB.2.8-1';
		return $seq;
	}
	
	$currentact= $seq->currentactivity;
	if ($currentact->parent != '/') {//if the activity is the root and is leaf
	    $parent = scorm_get_parent ($activity);
		if (!isset($parent->flow) || ($parent->flow == false)) {
			$seq->delivery = null;
	        $seq->exception = 'SB.2.8-2';
	        return $seq;
		}

		$res = scorm_seq_flow($currentact,'backward',$seq,false,$userid);
		if($res){
			return $res;
		}
		else{
			//return end and exception
		}

	}

}

function scorm_seq_exit_sequencing($scoid,$userid,$seq){
	if (empty($seq->currentactivity)) {
		$seq->delivery = null;
		$seq->exception = 'SB.2.11-1';
		return $seq;
	}

	 if ($seq->active){
		 $seq->endsession = false;
		 $seq->exception = 'SB.2.11-2';
		 return $seq;
	 }
	 $currentact= $seq->currentactivity;
	 if ($currentact->parent == '/'){
		 $seq->endsession = true;
		 return $seq;
	 }
		
	$seq->endsession = false;
	return $seq;
}


function scorm_seq_retry_sequencing($scoid,$userid,$seq){
	if (empty($seq->currentactivity)) {
		$seq->delivery = null;
		$seq->exception = 'SB.2.10-1';
		return $seq;
	}
	if ($seq->active || $seq->suspended){
		$seq->delivery = null;
		$seq->exception = 'SB.2.10-2';
		return $seq;
	}
	
	if (!scorm_is_leaf($seq->currentactivity)){
	    $res = scorm_seq_flow($seq->currentactivity,'forward',$seq,true,$userid);
		if($res != null){
			return $res;
			//return deliver
		}
		else{
			$seq->delivery = null;
		    $seq->exception = 'SB.2.10-3';
		    return $seq;
		}
	}
	else{
		$seq->delivery = $seq->currentactivity;
		return $seq;
	}

}

function scorm_seq_flow ($candidate,$direction,$seq,$childrenflag,$userid){
	//$PREVDIRECTION NOT DEFINED YET

	$activity=$candidate;
	$deliverable=false;
	$previdirection = null;
	$seq = scorm_seq_flow_tree_traversal ($activity,$direction,$childrenflag,$prevdirection,$seq,$userid);
	if($seq->identifiedactivity == null){//if identifies
		$seq->identifiedactivity = $candidate;
		$seq->deliverable = false;
		return $seq;
	}
	else{
		$activity = $seq->identifiedactivity;
		$seq = scorm_seq_flow_activity_traversal($activity,$userid,$direction,$childrenflag,$prevdirection,$seq,$userid);//
		return $seq;