pridana kontrola zmien hladiny a odosielanie notifikacie na Telegram

server/log.php

@@ -2,11 +2,72 @@
 
 declare(strict_types=1);
 
-function respondJson(int $statusCode, array $payload): void
+require_once __DIR__.'/functions.inc.php';
+
+function loadPreviousRecord(string $filename): ?array
 {
-	http_response_code($statusCode);
-	header('Content-Type: application/json; charset=utf-8');
-	echo json_encode($payload) . PHP_EOL;
+	if (!is_file($filename)) {
+		return null;
+	}
+
+	$lines = file($filename, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+	if ($lines === false || count($lines) < 2) {
+		return null;
+	}
+
+	// The current record has already been appended, so the previous one is the line before it.
+	$previous = json_decode($lines[count($lines) - 2], true);
+	if (!is_array($previous)) {
+		return null;
+	}
+
+	return $previous;
+}
+
+function levelsChanged(?array $previous, array $current): bool
+{
+	if ($previous === null) {
+		return false;
+	}
+
+	foreach (['level1', 'level2', 'level3', 'level4'] as $name) {
+		if (!array_key_exists($name, $previous) || (int) $previous[$name] !== (int) $current[$name]) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+function isValidLevelState(array $levels): bool
+{
+	$lowerLevelInactive = false;
+	foreach (['level1', 'level2', 'level3', 'level4'] as $name) {
+		if ((int) $levels[$name] === 0) {
+			$lowerLevelInactive = true;
+			continue;
+		}
+
+		if ($lowerLevelInactive) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+function calculateFilledPercent(array $levels): int
+{
+	$activeLevels = 0;
+	foreach (['level1', 'level2', 'level3', 'level4'] as $name) {
+		if ((int) $levels[$name] !== 1) {
+			break;
+		}
+
+		$activeLevels++;
+	}
+
+	return $activeLevels * 25;
 }
 
 if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
@@ -83,6 +144,23 @@ if ($written === false) {
 	exit;
 }
 
+$previousRecord = loadPreviousRecord($filename);
+if (levelsChanged($previousRecord, $record)) {
+	// Notify only when the level state changed compared to the previous saved measurement.
+	if (!isValidLevelState($record)) {
+		notifyUsers(sprintf(
+			'Chyba merania hladiny kondenzátu klimatizácie (level1=%d, level2=%d, level3=%d, level4=%d)',
+			$record['level1'],
+			$record['level2'],
+			$record['level3'],
+			$record['level4']
+		));
+	} else {
+		$filledPercent = calculateFilledPercent($record);
+		notifyUsers(sprintf('Nádržka kondenzu klimatizácie: %d%%', $filledPercent));
+	}
+}
+
 respondJson(200, [
 	'success' => true,
 ]);