<?php
// api.php - Backend Logik

$db_file = __DIR__ . '/status.sqlite';
$pdo = new PDO('sqlite:' . $db_file);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// --- Manuelle Bereinigung per Frontend ---
if (isset($_GET['action']) && $_GET['action'] === 'cleanup') {
    // FEHLER BEHOBEN: Es muss $pdo heißen, nicht $db!
    // Zeitabgleich gefixt: Wir nutzen datetime('now', '-2 minutes'), da der INSERT auch in UTC erfolgt.
    $pdo->exec("DELETE FROM nodes WHERE last_seen < datetime('now', '-1 days')");
    
    header('Content-Type: application/json');
    echo json_encode(["status" => "success"]);
    exit;
}

// Tabelle erstellen, falls nicht existent
$pdo->exec("CREATE TABLE IF NOT EXISTS nodes (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    server TEXT,
    client TEXT,
    status TEXT,
    handshake TEXT,
    last_seen DATETIME DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(server, client)
)");

// POST: Daten vom Gateway empfangen
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents('php://input'), true);
    
    if ($data && isset($data['server']) && isset($data['client'])) {
        $stmt = $pdo->prepare("
            INSERT INTO nodes (server, client, status, handshake, last_seen) 
            VALUES (:server, :client, :status, :handshake, datetime('now'))
            ON CONFLICT(server, client) 
            DO UPDATE SET status=:status, handshake=:handshake, last_seen=datetime('now')
        ");
        $stmt->execute([
            ':server' => $data['server'],
            ':client' => $data['client'],
            ':status' => $data['status'],
            ':handshake' => $data['handshake']
        ]);
        echo json_encode(["success" => true]);
    } else {
        http_response_code(400);
        echo json_encode(["error" => "Invalid payload"]);
    }
    exit;
}

// GET: Daten an das Frontend (HTML/JS) ausliefern
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    header('Content-Type: application/json');
    $stmt = $pdo->query("SELECT * FROM nodes ORDER BY server, client");
    echo json_encode($stmt->fetchAll(PDO::FETCH_ASSOC));
    exit;
}