<?php
// logger.php - Optimiertes Logging für Cabinet Digital Signage
// Erlaubt CORS
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Content-Type");
header("Access-Control-Allow-Methods: POST, OPTIONS");
header("Content-Type: application/json");

// Handle OPTIONS preflight request
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit;
}

// Nur POST akzeptieren
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $input = file_get_contents('php://input');
    $data = json_decode($input, true);

    if ($data) {
        $level = strtoupper($data['level'] ?? 'INFO');
        $message = $data['message'] ?? 'n/a';
        $timestamp = $data['timestamp'] ?? date('c');
        $context = $data['context'] ?? [];
        $viewport = $data['viewport'] ?? 'unknown';
        $connection = $data['connection'] ?? 'unknown';

        // Log-Eintrag mit strukturierten Daten
        $logEntry = [
            'timestamp' => date('Y-m-d H:i:s'),
            'iso_timestamp' => $timestamp,
            'level' => $level,
            'message' => $message,
            'ip' => $_SERVER['REMOTE_ADDR'] ?? 'unknown',
            'user_agent' => $_SERVER['HTTP_USER_AGENT'] ?? 'unknown',
            'viewport' => $viewport,
            'connection' => $connection,
            'context' => $context
        ];

        // Log-Datei basierend auf Level
        $logFile = __DIR__ . '/logs/' . strtolower($level) . '_' . date('Y-m-d') . '.log';
        $allLogsFile = __DIR__ . '/logs/all_' . date('Y-m-d') . '.log';

        // Logs-Verzeichnis erstellen falls nicht vorhanden
        $logsDir = __DIR__ . '/logs';
        if (!is_dir($logsDir)) {
            mkdir($logsDir, 0755, true);
        }

        // Formatierte Log-Zeile (human-readable)
        $logLine = sprintf(
            "[%s] [%s] %s\n",
            date('Y-m-d H:i:s'),
            str_pad($level, 8),
            $message
        );

        // Zusätzliche Kontext-Informationen wenn vorhanden
        if (!empty($context)) {
            $logLine .= "  Context: " . json_encode($context, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . "\n";
        }

        $logLine .= "  IP: {$logEntry['ip']} | Viewport: {$viewport} | Connection: {$connection}\n";
        $logLine .= str_repeat('-', 80) . "\n";

        // JSON Log für maschinelle Verarbeitung
        $jsonLogLine = json_encode($logEntry, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . "\n";
        $jsonLogFile = __DIR__ . '/logs/json_' . date('Y-m-d') . '.log';

        // In Dateien schreiben
        file_put_contents($logFile, $logLine, FILE_APPEND | LOCK_EX);
        file_put_contents($allLogsFile, $logLine, FILE_APPEND | LOCK_EX);
        file_put_contents($jsonLogFile, $jsonLogLine, FILE_APPEND | LOCK_EX);

        // Log-Rotation: Dateien älter als 30 Tage löschen
        $files = glob($logsDir . '/*.log');
        $now = time();
        foreach ($files as $file) {
            if (is_file($file) && $now - filemtime($file) >= 30 * 24 * 3600) {
                unlink($file);
            }
        }

        // Erfolgsantwort
        echo json_encode(['status' => 'success', 'message' => 'Log received']);
    } else {
        http_response_code(400);
        echo json_encode(['status' => 'error', 'message' => 'Invalid JSON']);
    }
} else {
    http_response_code(405);
    echo json_encode(['status' => 'error', 'message' => 'Method not allowed']);
}