/*
 * gnome_screensaver.c v0.0.7
 *
 * Enable/Disable the GNOME screensaver
 * Supports GNOME screensaver API 2.14 and 2.15
 *
 * Call gnome_screensaver_control(1) to enable and
 * gnome_screensaver_control(0) to disable
 *
 */

#include <stdlib.h>
#include <unistd.h>
#include <dbus/dbus-glib.h>

#include "gnome_screensaver.h"
#include "mp_msg.h"
#include "help_mp.h"

#define GS_SERVICE   "org.gnome.ScreenSaver"
#define GS_PATH      "/org/gnome/ScreenSaver"
#define GS_INTERFACE "org.gnome.ScreenSaver"

#define GS_APPLICATION_NAME     "MPlayer"
#define GS_REASON_FOR_INHIBIT   "Playing a movie"

#if defined(ARCH_X86_64)
  static guint64 cookie;
#else
  static guint32 cookie;
#endif

void gnome_screensaver_control(int enable)
{
    DBusGConnection *connection;
    GError *error;
    DBusGProxy *proxy;
    gboolean ret;
    char *funcname = "gnome_screensaver_control()";

    g_type_init();

    /* Get a connection to the session bus */
    error = NULL;
    connection = dbus_g_bus_get(DBUS_BUS_SESSION, &error);
    if (connection == NULL) {
        mp_msg(MSGT_VO, MSGL_V,
               funcname, MSGTR_OpenBusConnectionError, error->message);
        g_error_free(error);
        return;
    }

    /* Create a proxy object */
    proxy = dbus_g_proxy_new_for_name(connection,
                                      GS_SERVICE, GS_PATH, GS_INTERFACE);

    /* Enable the screensaver */
    if (enable) {
        /* First call the GNOME screensaver 2.15 API method */
        error = NULL;
        ret =
            dbus_g_proxy_call(proxy, "UnInhibit", &error, G_TYPE_UINT,
                              cookie, G_TYPE_INVALID, G_TYPE_INVALID);

        /* If this fails, try the GNOME screensaver 2.14 API */
        if (!ret && error->domain == DBUS_GERROR
            && error->code == DBUS_GERROR_UNKNOWN_METHOD) {
            mp_msg(MSGT_VO, MSGL_V,
                   "%s: GNOME screensaver 2.15 API failed, trying 2.14 API\n",
                   funcname);
            g_error_free(error);
            error = NULL;
            ret =
                dbus_g_proxy_call(proxy, "AllowActivation", &error,
                                  G_TYPE_INVALID, G_TYPE_INVALID);
        }
    }
    /* Disable the screensaver */
    else {
        /* First call the GNOME screensaver 2.15 API method */
        error = NULL;
        ret =
            dbus_g_proxy_call(proxy, "Inhibit", &error, G_TYPE_STRING,
                              GS_APPLICATION_NAME, G_TYPE_STRING,
                              GS_REASON_FOR_INHIBIT, G_TYPE_INVALID,
                              G_TYPE_UINT, cookie, G_TYPE_INVALID);

        /* If this fails, try the GNOME screensaver 2.14 API */
        if (!ret && error->domain == DBUS_GERROR
            && error->code == DBUS_GERROR_UNKNOWN_METHOD) {
            mp_msg(MSGT_VO, MSGL_V,
                   "%s: GNOME screensaver 2.15 API failed, trying 2.14 API\n",
                   funcname);
            g_error_free(error);
            error = NULL;
            ret =
                dbus_g_proxy_call(proxy, "InhibitActivation", &error,
                                  G_TYPE_STRING, GS_REASON_FOR_INHIBIT,
                                  G_TYPE_INVALID, G_TYPE_INVALID);
        }
    }

    if (!ret) {
        /* Check if it's a remote exception or a regular GError */
        if (error->domain == DBUS_GERROR
            && error->code == DBUS_GERROR_REMOTE_EXCEPTION) {
            mp_msg(MSGT_VO, MSGL_V,
                   funcname, MSGTR_RemoteMethodException,
                   dbus_g_error_get_name(error), error->message);
        }
        else {
            mp_msg(MSGT_VO, MSGL_V,
                   funcname, MSGTR_GError, error->message);
        }
        g_error_free(error);
    }
    else {
        mp_msg(MSGT_VO, MSGL_INFO,
               enable ? MSGTR_GNOMEScreensaverEnabled :
               MSGTR_GNOMEScreensaverDisabled);
    }

    g_object_unref(proxy);
}