Printing from DocumentController is broken

[BertalanD]

@sszajbely

The logic in DocumentController::printDocument seems to have been missed in #394, and the function references the now-nonexistent App\Utils\Printer class:

mars/app/Http/Controllers/Secretariat/DocumentController.php

Lines 135 to 143 in 4bfe84d

	private function printDocument($result, $filename)
	{
	if (!$result['success']) {
	return $result['redirect'];
	}
	$document = $result['pdf'];
	$printer = new Printer($filename, $document, /* $use_free_pages */ true);
	return $printer->print();
	}

We should factor out the code for checking and deducting print balances and initiating the print job from PrintJobController::store into a function that can be called from backend logic.

[sszajbely]

Sorry about this oversight. I think the PrinterHelper class would be the most suitable with a function like

function tryCreatePrintJob(string $documentPath, bool $doubleSided, <etc.>) PrintJobCreationProcess

where PrintJobCreationProcess is an enum with values like PrintJobCreationProcess::noBalance, PrintJobCreationProcess::errorPrinting or PrintJobCreationProcess::success. Then both the store method of the PrintJobController and the DocumentController can use this function and based on the returned enum value send a message to the user.