/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2013 Red Hat, Inc.
 */

#include "nm-default.h"

#include "nm-dbus-helpers.h"

#include "nm-dbus-interface.h"

GBusType
_nm_dbus_bus_type(void)
{
    static volatile int bus_type = G_BUS_TYPE_NONE;
    int                 v;

    v = g_atomic_int_get(&bus_type);
    if (G_UNLIKELY(v == G_BUS_TYPE_NONE)) {
        v = G_BUS_TYPE_SYSTEM;
        if (g_getenv("LIBNM_USE_SESSION_BUS"))
            v = G_BUS_TYPE_SESSION;
        if (!g_atomic_int_compare_and_exchange(&bus_type, G_BUS_TYPE_NONE, v))
            v = g_atomic_int_get(&bus_type);
        nm_assert(v != G_BUS_TYPE_NONE);
    }
    return v;
}

/* Binds the properties on a generated server-side GDBus object to the
 * corresponding properties on the public object.
 */
void
_nm_dbus_bind_properties(gpointer object, gpointer skeleton)
{
    GParamSpec **properties;
    guint        n_properties;
    int          i;

    properties = g_object_class_list_properties(G_OBJECT_GET_CLASS(skeleton), &n_properties);
    for (i = 0; i < n_properties; i++) {
        if (g_str_has_prefix(properties[i]->name, "g-"))
            continue;

        g_object_bind_property(object,
                               properties[i]->name,
                               skeleton,
                               properties[i]->name,
                               G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
    }
    g_free(properties);
}

static char *
signal_name_from_method_name(const char *method_name)
{
    GString *   signal_name;
    const char *p;

    signal_name = g_string_new("handle");
    for (p = method_name; *p; p++) {
        if (g_ascii_isupper(*p))
            g_string_append_c(signal_name, '-');
        g_string_append_c(signal_name, g_ascii_tolower(*p));
    }

    return g_string_free(signal_name, FALSE);
}

static void
_nm_dbus_method_meta_marshal(GClosure *    closure,
                             GValue *      return_value,
                             guint         n_param_values,
                             const GValue *param_values,
                             gpointer      invocation_hint,
                             gpointer      marshal_data)
{
    closure->marshal(closure,
                     return_value,
                     n_param_values,
                     param_values,
                     invocation_hint,
                     ((GCClosure *) closure)->callback);

    g_value_set_boolean(return_value, TRUE);
}

/* Takes (method_name, handler_func) pairs and connects the handlers to the
 * signals on skeleton, with object as the user_data, but swapped so it comes
 * first in the argument list, and handling the return value automatically.
 */
void
_nm_dbus_bind_methods(gpointer object, gpointer skeleton, ...)
{
    va_list     ap;
    const char *method_name;
    char *      signal_name;
    GCallback   handler;
    GClosure *  closure;

    va_start(ap, skeleton);
    while ((method_name = va_arg(ap, const char *)) && (handler = va_arg(ap, GCallback))) {
        signal_name = signal_name_from_method_name(method_name);
        closure     = g_cclosure_new_swap(handler, object, NULL);
        g_closure_set_meta_marshal(closure, NULL, _nm_dbus_method_meta_marshal);
        g_signal_connect_closure(skeleton, signal_name, closure, FALSE);
        g_free(signal_name);
    }
    va_end(ap);
}
