public function time_graphAction($weeks = "all", $debug = false)
{
$this->view->disable();
// Get our context (this takes care of starting the session, too)
$context = $this->getDI()->getShared('ltiContext');
if (!$context->valid) {
echo '[{"error":"Invalid lti context"}]';
return;
}
$email = $context->getUserName();
// Fetch skill history items for the current student
$historyResults = StudentMasteryHistory::find(["email = '{$email}'", "order" => 'time_stored DESC']);
$historyPoints = [];
foreach ($historyResults as $day) {
// Scores are saved at 3am, so they actually correspond to the previous day
$formattedDate = date('M j', strtotime('-1 day', strtotime($day->time_stored)));
$historyPoints[] = [$formattedDate, round($day->unit1 * 100) / 100, round($day->unit2 * 100) / 100, round($day->unit3 * 100) / 100, round($day->unit4 * 100) / 100];
//$historyPoints []= [$formattedDate, rand(0,100) / 10, rand(0,100) / 10];
}
// In case it gets saved multiple times, eliminate duplicates
$historyPoints = array_unique($historyPoints, SORT_REGULAR);
// Get the amount of data requested:
switch ($weeks) {
case "2":
$historyPoints = array_slice($historyPoints, 0, 14);
break;
case "4":
$historyPoints = array_slice($historyPoints, 0, 28);
break;
default:
break;
}
// echo json_encode($historyPoints);
// Put it in correct order
$historyPoints = array_reverse($historyPoints);
//print_r($historyPoints);
if ($debug) {
print_r($historyPoints);
}
// Output data as csv so that we only have to send header information once
if (!$debug) {
header("Content-Type: text/csv");
}
$output = fopen("php://output", "w");
// Header row
fputcsv($output, ["date", "Unit 1", "Unit 2", "Unit 3", "Unit 4"]);
foreach ($historyPoints as $row) {
fputcsv($output, $row);
// here you can change delimiter/enclosure
}
fclose($output);
}
