#include "util/prepare_for_sleep.h"

#include <gio/gio.h>
#include <spdlog/spdlog.h>

namespace {
class PrepareForSleep {
 private:
  PrepareForSleep() {
    login1_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, nullptr, nullptr);
    if (login1_connection == nullptr) {
      spdlog::warn("Unable to connect to the SYSTEM Bus!...");
    } else {
      login1_id = g_dbus_connection_signal_subscribe(
          login1_connection, "org.freedesktop.login1", "org.freedesktop.login1.Manager",
          "PrepareForSleep", "/org/freedesktop/login1", nullptr, G_DBUS_SIGNAL_FLAGS_NONE,
          prepareForSleep_cb, this, nullptr);
    }
  }

  static void prepareForSleep_cb(GDBusConnection* system_bus, const gchar* sender_name,
                                 const gchar* object_path, const gchar* interface_name,
                                 const gchar* signal_name, GVariant* parameters,
                                 gpointer user_data) {
    if (g_variant_is_of_type(parameters, G_VARIANT_TYPE("(b)")) != 0) {
      gboolean sleeping;
      g_variant_get(parameters, "(b)", &sleeping);

      auto* self = static_cast<PrepareForSleep*>(user_data);
      self->signal.emit(sleeping);
    }
  }

 public:
  static PrepareForSleep& GetInstance() {
    static PrepareForSleep instance;
    return instance;
  }
  waybar::SafeSignal<bool> signal;

 private:
  guint login1_id;
  GDBusConnection* login1_connection;
};
}  // namespace

waybar::SafeSignal<bool>& waybar::util::prepare_for_sleep() {
  return PrepareForSleep::GetInstance().signal;
}