if ($action == 'update_post') {
    $post_id = $_POST['post_id'];
    $aku_id = $_POST['aku_id'];
    $content = $_POST['content'];
    $image_url = $_POST['old_image_url'] ?? null;

    // Logika upload foto baru jika ada
    if (isset($_FILES['image'])) {
        $target_dir = "../uploads/posts/";
        $new_file = time() . ".webp";
        if (move_uploaded_file($_FILES["image"]["tmp_name"], $target_dir . $new_file)) {
            $image_url = "https://sdksantamaria.sch.id/kancan/uploads/posts/" . $new_file;
        }
    }

    // QUERY UTAMA UPDATE
    $stmt = $conn->prepare("UPDATE postingan SET content = ?, image_url = ? WHERE post_id = ? AND aku_id = ?");
    $stmt->bind_param("ssii", $content, $image_url, $post_id, $aku_id);
    
    if ($stmt->execute()) {
        echo json_encode(["success" => true, "message" => "Berhasil"]);
    } else {
        echo json_encode(["success" => false, "message" => $conn->error]);
    }
    exit;
}