public function __construct($studentId, $courseId, $em, $student)
{
$this->nodes = array();
$this->edges = array();
$lessons = array();
$csSkill = array();
$cognitiveState = $em->getRepository('sociaLecompsSuperBundle:Student')->getCognitiveState($studentId);
for ($i = 0; $i < count($cognitiveState); $i++) {
$csSkill[$i] = $cognitiveState[$i]->getSkill()->getId();
}
$course = $em->getRepository('sociaLecompsSuperBundle:Course')->find($courseId);
if ($course != null) {
$lessons = $em->getRepository('sociaLecompsSuperBundle:Lesson')->getLessons($course);
}
foreach ($lessons as $lesson) {
$rk = $lesson->getRequiredSkills();
if (count($rk) == 0) {
$basic = $em->getRepository('sociaLecompsSuperBundle:Skill')->findBy(array('name' => 'basic knowledge'));
$node = new Node($basic[0], $lesson);
$this->nodes[$node->getId()] = $node;
$node->setInCS();
$node->setDistance(0);
$currentNode = $this->nodes[$node->getId()];
$currentNode->addOut($lesson->getId());
} else {
foreach ($rk as $skill) {
/*
* verifico se il nodo è già esistente nel grafo
* se lo è devo solo aggiornare gli archi
* se non lo è creo il nodo e poi aggiungo l'arco
*/
if (array_key_exists($skill->getId(), $this->nodes)) {
$currentNode = $this->nodes[$skill->getId()];
$currentNode->addOut($lesson->getId());
} else {
$node = new Node($skill, $lesson);
$this->nodes[$node->getId()] = $node;
if (in_array($node->getId(), $csSkill)) {
$cs = $em->getRepository('sociaLecompsSuperBundle:CognitiveState')->findBy(array('skill' => $node->getId(), 'student' => $studentId));
$node->setInCS();
$node->setDistance(0);
$node->setCertanty($cs[0]->getCertainty());
}
$currentNode = $this->nodes[$skill->getId()];
$currentNode->addOut($lesson->getId());
}
}
}
$ak = $lesson->getAcquiredSkills();
foreach ($ak as $skill) {
if (array_key_exists($skill->getId(), $this->nodes)) {
$currentNode = $this->nodes[$skill->getId()];
$currentNode->addIn($lesson->getId());
} else {
$node = new Node($skill, $lesson);
$this->nodes[$node->getId()] = $node;
if (in_array($node->getId(), $csSkill)) {
$cs = $em->getRepository('sociaLecompsSuperBundle:CognitiveState')->findBy(array('skill' => $node->getId(), 'student' => $studentId));
$node->setInCS();
$node->setDistance(0);
$node->setCertanty($cs[0]->getCertainty());
}
$currentNode = $this->nodes[$skill->getId()];
$currentNode->addIn($lesson->getId());
}
}
$edge = new Edge($lesson);
//crea l'arco che rappresenta la lc
$this->edges[$edge->getId()] = $edge;
//inserisce l'arco nell'array degli archi del grafo
}
//Inizializza le distanze stimate di ogni nodo con il peso minimo degli archi entranti
foreach ($this->nodes as $node) {
foreach ($node->getIn() as $e) {
$edge = $this->edges[$e];
if ($edge->getWeight() < $node->getDistance()) {
$node->setDistance($edge->getWeight());
}
}
}
}
