/**
* The number of cards that need to be reviewed.
* @return int
*/
public function numToReview()
{
$userCalculator = new UserStatsCalculator($this->user);
$userCalculator->calcRecallScores();
$needToReview = $this->user->flashcards()->where('recall_score', '<=', self::REVIEW_THRESHOLD)->get();
$numToReview = $this->deckCards->intersect($needToReview)->count();
return $numToReview;
}
protected function getSessionFlashcards()
{
//get 10 most struggleed with words by recall score
$calculator = new UserStatsCalculator($this->user);
$scores = $calculator->calcRecallScores();
$usable = collect();
foreach ($scores as $flashcard_id => $score) {
if ($usable->count() >= self::NUM_CONCEPTS) {
break;
}
$this->deck->flashcards->each(function ($item) use(&$usable, $flashcard_id) {
if ($item->id == $flashcard_id) {
$usable->push($item);
return False;
}
});
}
return $usable;
}
/**
* Get all concepts, sorted by recall score from low to high.
* @param $force - if set to true, it will recalculate all scores instead of returning the cached version.
* @return ['flashcard_id' => average_recall_score]
*/
public function calcRecallScores($force = False)
{
if (isset($this->recallScores) && !$force) {
return $this->recallScores;
}
/**
* [
* $flashcardId => [
* 'sum_scores' => $sum,
* 'num_scores' => $num
* ]
* ]
*/
$aggregateScores = [];
foreach ($this->deck->users as $user) {
$userCalculator = new UserStatsCalculator($user);
$scores = $userCalculator->calcRecallScores();
foreach ($scores as $flashcardId => $recallScore) {
if ($this->inDeck($flashcardId)) {
if (array_key_exists($flashcardId, $aggregateScores)) {
$aggregateScores[$flashcardId]['sum_scores'] += $recallScore;
$aggregateScores[$flashcardId]['sum_scores'] += 1;
} else {
$aggregateScores[$flashcardId] = ['sum_scores' => $recallScore, 'num_scores' => 1];
}
}
}
}
$averageScores = [];
foreach ($aggregateScores as $flashcardId => $info) {
$averageScores[$flashcardId] = round($info['sum_scores'] / $info['num_scores']);
}
asort($averageScores);
$this->recallScores = $averageScores;
return $averageScores;
}