<?php
	
use Endroid\QrCode\Encoding\Encoding;
use Endroid\QrCode\ErrorCorrectionLevel\ErrorCorrectionLevelLow;
use Endroid\QrCode\QrCode;
use Endroid\QrCode\Response\QrCodeResponse;
use Endroid\QrCode\Writer\PngWriter;
use Endroid\QrCode\Color\Color;

if ($_SERVER['REQUEST_METHOD'] == "POST" && isset($_POST['command']) ) {
	
	switch ($_POST['command']) {
		
		case 'save_USER':
			//print_r ($_POST);
			
			// Strip out everything but letters & drop anything longer than 1 character on the last initial
			$firstname = preg_replace('/[^A-Za-z]/i','',$_POST['firstname']);
			$lastinitial = preg_replace('/[^A-Za-z]/i','',$_POST['lastinitial']);
			$lastinitial = substr($lastinitial, 0, 1);
            
			$artist = ( isset($_POST['artist']) && in_array($_POST['artist'], array(0,1)) ? $_POST['artist'] : 0 );
			$rules = ( isset($_POST['rules']) && in_array($_POST['rules'], array(0,1)) ? $_POST['rules'] : 0 );
			$waiver = ( isset($_POST['waiver']) && in_array($_POST['waiver'], array(0,1)) ? $_POST['waiver'] : 0 );
            $skill_testing = ( isset($_POST['skill_testing']) && $_POST['skill_testing'] == $cfg['skill_testing_answer'] ? $_POST['skill_testing'] : 0 );
			$signature = ( isset($_POST['sig']) ? $_POST['sig'] : 0 );
			
			$qr_uuid = vsprintf( '%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex(random_bytes(16)), 4) );
			
			$sql = "INSERT INTO user (datetime, firstname, lastinitial, artist, rules, waiver, skill_testing, signature, qr_uuid) VALUES (:datetime, :firstname, :lastinitial, :artist, :rules, :waiver, :skill_testing, :signature, :qr_uuid)";
			$insert = $db->prepare($sql);
			$insert->execute( array(":datetime" => time(), ":firstname" => $firstname, ":lastinitial" => $lastinitial, ":artist" => $artist, ":rules" => $rules, ":waiver" => $waiver, ":skill_testing" => $skill_testing, ":signature" => $signature, ":qr_uuid" => $qr_uuid) );
			
			$writer = new PngWriter();
			$qrCode = QrCode::create($qr_uuid)
				->setEncoding(new Encoding('UTF-8'))
				->setErrorCorrectionLevel(new ErrorCorrectionLevelLow())
				->setSize(600)
				->setMargin(20)
				->setBackgroundColor(new Color(255,255,255))
				->setForegroundColor(new Color(0,0,0));
			
			$result = $writer->write($qrCode);
			$dataUri = $result->getDataUri();
			
            $_SESSION['qrCode'] = $dataUri;
            
			exit(json_encode(array('result' => 'success', 'qr_code_val' => $qr_uuid, 'qr_code' => $dataUri)));
			
		break;
		
/*
		case 'user_LOOKUP':
			$sql = "SELECT id FROM user WHERE email = :email";
			$select = $db->prepare($sql);
			$select->execute( array(":email" => $_POST['email']) );
			$result = $select->fetchAll(PDO::FETCH_ASSOC);
			
			if ( empty($result) ) {
				exit(json_encode(array('result' => 'newuser')));
			
			} else {
				exit(json_encode(array('result' => 'duplicate')));
			
			}
		
		break;
*/
		
/*
		case 'generate_QR':
			
			// Check if the machine is empty
			$sql = "SELECT * FROM machine WHERE quantity > 0";
			$query = $db->prepare($sql);
			$query->execute();
			$stockCheck = $query->fetch(PDO::FETCH_ASSOC);
			
			if (empty($stockCheck)) {
				// Machine is empty
				exit(json_encode(array('result' => 'empty')));
			} else {
				
				// Check for low stock
				$query_sum = $db->prepare('SELECT SUM(quantity) as amt FROM `machine`');
				$query_sum->execute();
				$sum = $query_sum->fetchColumn();
				if (intval($sum) < $cfg['amount_threshold'] && $_SESSION['last_sent'] < strtotime("-20 minutes")) {
					$_SESSION['last_sent'] = time();
					send_recipient_email($cfg['email_to_notify'], 'adp', $sum, date("m/d/Y H:i A"));
				}
			}
			
			// Add a QR code to the database
			$query = $db->prepare('INSERT INTO qr_code (qr_uuid) VALUES ( REPLACE(UUID(), "-", "") )');
			$query->execute();
			
			// Get record ID
			$qr_code_id = $db->lastInsertId();
			
			// Lookup the UUID
			$query = $db->prepare("SELECT qr_uuid AS uuid FROM qr_code WHERE id = :id");
			$query->execute( array(":id" => $qr_code_id) );
			$result = $query->fetch(PDO::FETCH_ASSOC);

			// Generate the QR code and send it back
			if (!empty($result)) {
				
				$qr_uuid = $result['uuid'];
				
				$writer = new PngWriter();
				$qrCodeValue = $cfg['qr_url'] . "?c=" . $qr_uuid;
			
				$qrCode = QrCode::create($qrCodeValue)
					->setEncoding(new Encoding('UTF-8'))
					->setErrorCorrectionLevel(new ErrorCorrectionLevelLow())
					->setSize(600)
					->setMargin(20)
					//->setBackgroundColor(new Color(255,255,255))
					->setBackgroundColor(new Color(237,175,138))
					->setForegroundColor(new Color(48,46,63));
				
				$result = $writer->write($qrCode);
				$dataUri = $result->getDataUri();
				
				exit(json_encode(array('result' => 'success', 'qr_code_url' => $qrCodeValue, 'qr_uuid' => $qr_uuid, 'qr_code' => $dataUri)));
			
			}
		
		break;
		
		case 'check_QR':
			
			$query = $db->prepare("SELECT * FROM qr_code WHERE qr_uuid = :id AND used_datetime IS NULL");
			$query->execute( array(":id" => $_POST['c']) );
			$result = $query->fetch(PDO::FETCH_ASSOC);
			
			if (!empty($result)) {
				exit(json_encode(array('qr_status' => 'unused')));
			} else {
				exit(json_encode(array('qr_status' => 'used')));
			}
			
		break;
*/
		
	}
		
}
?>