/* Copyright (C) 2010 The giomm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <gio/gio.h>
#include <glibmm/error.h>
#include <glibmm/exceptionhandler.h>
#include <giomm/cancellable.h>
#include <giomm/slot_async.h>

namespace // anonymous
{
using AsyncInitable_init_async_vfunc_functype = void (*) (GAsyncInitable* self,
  int io_priority, GCancellable* cancellable, GAsyncReadyCallback callback,
  gpointer user_data);
using AsyncInitable_init_finish_vfunc_functype = gboolean (*) (GAsyncInitable* self,
  GAsyncResult* res, GError** error);

AsyncInitable_init_async_vfunc_functype AsyncInitable_init_async_vfunc_funcptr;
AsyncInitable_init_finish_vfunc_functype AsyncInitable_init_finish_vfunc_funcptr;

extern "C"
{
static void
AsyncInitable_init_async_vfunc_c_callback(GAsyncInitable* self, int io_priority,
  GCancellable* cancellable, GAsyncReadyCallback callback, gpointer user_data)
{
  AsyncInitable_init_async_vfunc_funcptr(self, io_priority, cancellable, callback, user_data);
}

static gboolean
AsyncInitable_init_finish_vfunc_c_callback(GAsyncInitable* self,
  GAsyncResult* res, GError** error)
{
  return AsyncInitable_init_finish_vfunc_funcptr(self, res, error);
}
} // extern "C"
} // anonymous namespace

namespace Gio
{

void
AsyncInitable::init_async(
  const SlotAsyncReady& slot, const Glib::RefPtr<Cancellable>& cancellable, int io_priority)
{
  // Create a copy of the slot.
  // A pointer to it will be passed through the callback's data parameter
  // and deleted in the callback.
  auto slot_copy = new SlotAsyncReady(slot);

  g_async_initable_init_async(
    gobj(), io_priority, Glib::unwrap(cancellable), &SignalProxy_async_callback, slot_copy);
}

void
AsyncInitable::init_async(const SlotAsyncReady& slot, int io_priority)
{
  // Create a copy of the slot.
  // A pointer to it will be passed through the callback's data parameter
  // and deleted in the callback.
  auto slot_copy = new SlotAsyncReady(slot);

  g_async_initable_init_async(gobj(), io_priority, nullptr, &SignalProxy_async_callback, slot_copy);
}

void
AsyncInitable_Class::init_async_vfunc_callback(GAsyncInitable* self, int io_priority,
  GCancellable* cancellable, GAsyncReadyCallback callback, gpointer user_data)
{
  const auto obj_base =
    static_cast<Glib::ObjectBase*>(Glib::ObjectBase::_get_current_wrapper((GObject*)self));

  // Non-gtkmmproc-generated custom classes implicitly call the default
  // Glib::ObjectBase constructor, which sets is_derived_. But gtkmmproc-
  // generated classes can use this optimisation, which avoids the unnecessary
  // parameter conversions if there is no possibility of the virtual function
  // being overridden:
  if (obj_base && obj_base->is_derived_())
  {
    const auto obj = dynamic_cast<CppObjectType* const>(obj_base);
    if (obj) // This can be nullptr during destruction.
    {
      try // Trap C++ exceptions which would normally be lost because this is a C callback.
      {
        // Get the slot.
        Gio::SlotAsyncReady* the_slot = static_cast<Gio::SlotAsyncReady*>(user_data);

        // Call the virtual member method, which derived classes might override.
        obj->init_async_vfunc(*the_slot, Glib::wrap(cancellable, true), io_priority);
        return;
      }
      catch (...)
      {
        Glib::exception_handlers_invoke();
      }
    }
  }

  const auto base = static_cast<BaseClassType*>(
    g_type_interface_peek_parent( // Get the parent interface of the interface (The original
                                  // underlying C interface).
      g_type_interface_peek(
        G_OBJECT_GET_CLASS(self), CppObjectType::get_type()) // Get the interface.
      ));

  // Call the original underlying C function:
  if (base && base->init_async)
    (*base->init_async)(self, io_priority, cancellable, callback, user_data);
}
void
Gio::AsyncInitable::init_async_vfunc(
  const SlotAsyncReady& slot, const Glib::RefPtr<Cancellable>& cancellable, int io_priority)
{
  const auto base = static_cast<BaseClassType*>(
    g_type_interface_peek_parent( // Get the parent interface of the interface (The original
                                  // underlying C interface).
      g_type_interface_peek(
        G_OBJECT_GET_CLASS(gobject_), CppObjectType::get_type()) // Get the interface.
      ));

  if (base && base->init_async)
  {
    (*base->init_async)(gobj(), io_priority, const_cast<GCancellable*>(Glib::unwrap(cancellable)),
      &SignalProxy_async_callback, const_cast<SlotAsyncReady*>(&slot));
  }
}
gboolean
AsyncInitable_Class::init_finish_vfunc_callback(
  GAsyncInitable* self, GAsyncResult* res, GError** error)
{
  const auto obj_base =
    static_cast<Glib::ObjectBase*>(Glib::ObjectBase::_get_current_wrapper((GObject*)self));

  // Non-gtkmmproc-generated custom classes implicitly call the default
  // Glib::ObjectBase constructor, which sets is_derived_. But gtkmmproc-
  // generated classes can use this optimisation, which avoids the unnecessary
  // parameter conversions if there is no possibility of the virtual function
  // being overridden:
  if (obj_base && obj_base->is_derived_())
  {
    const auto obj = dynamic_cast<CppObjectType* const>(obj_base);
    if (obj) // This can be nullptr during destruction.
    {
      try // Trap C++ exceptions which would normally be lost because this is a C callback.
      {
        // Call the virtual member method, which derived classes might override.
        return static_cast<int>(obj->init_finish_vfunc(Glib::wrap(res, true)));
      }
      catch (...)
      {
        Glib::exception_handlers_invoke();
      }
    }
  }

  const auto base = static_cast<BaseClassType*>(
    g_type_interface_peek_parent( // Get the parent interface of the interface (The original
                                  // underlying C interface).
      g_type_interface_peek(
        G_OBJECT_GET_CLASS(self), CppObjectType::get_type()) // Get the interface.
      ));

  // Call the original underlying C function:
  if (base && base->init_finish)
    return (*base->init_finish)(self, res, error);

  using RType = gboolean;
  return RType();
}
bool
Gio::AsyncInitable::init_finish_vfunc(const Glib::RefPtr<AsyncResult>& res)
{
  const auto base = static_cast<BaseClassType*>(
    g_type_interface_peek_parent( // Get the parent interface of the interface (The original
                                  // underlying C interface).
      g_type_interface_peek(
        G_OBJECT_GET_CLASS(gobject_), CppObjectType::get_type()) // Get the interface.
      ));

  if (base && base->init_finish)
  {
    GError* gerror = nullptr;

    bool const result = (*base->init_finish)(gobj(), Glib::unwrap(res), &gerror);

    if (gerror)
      ::Glib::Error::throw_exception(gerror);

    return result;
  }

  using RType = bool;
  return RType();
}

} // namespace Gio