/* This file is part of Clementine.
   Copyright 2011, David Sansome <me@davidsansome.com>

   Clementine is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Clementine 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "closure.h"

#include "core/timeconstants.h"

#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
#include <QRandomGenerator>
#endif

namespace _detail {

ClosureBase::ClosureBase(ObjectHelper* helper) : helper_(helper) {}

ClosureBase::~ClosureBase() {}

CallbackClosure::CallbackClosure(QObject* sender, const char* signal,
                                 std::function<void()> callback)
    : ClosureBase(new ObjectHelper(sender, signal, this)),
      callback_(callback) {}

void CallbackClosure::Invoke() { callback_(); }

ObjectHelper* ClosureBase::helper() const { return helper_; }

ObjectHelper::ObjectHelper(QObject* sender, const char* signal,
                           ClosureBase* closure)
    : closure_(closure) {
  connection_ = connect(sender, signal, SLOT(Invoked()));
  connect(sender, SIGNAL(destroyed()), SLOT(TearDown()));
}

void ObjectHelper::TearDown() {
  // For the case that the receiver has been destroyed, disconnect the signal
  // so that Invoke isn't called.
  disconnect(connection_);
  deleteLater();
}

void ObjectHelper::Invoked() {
  closure_->Invoke();
  deleteLater();
}

void Unpack(QList<QGenericArgument>*) {}

}  // namespace _detail

_detail::ClosureBase* NewClosure(QObject* sender, const char* signal,
                                 std::function<void()> callback) {
  return new _detail::CallbackClosure(sender, signal, callback);
}

void DoAfter(QObject* receiver, const char* slot, int msec) {
  QTimer::singleShot(msec, receiver, slot);
}

void DoInAMinuteOrSo(QObject* receiver, const char* slot) {
  // qrand is deprecated in 5.15
#if (QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
  int msec = (60 + (qrand() % 60)) * kMsecPerSec;
#else
  int msec = QRandomGenerator::global()->bounded(60, 120) * kMsecPerSec;
#endif
  DoAfter(receiver, slot, msec);
}