/* 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 <QTimer>

#include "core/timeconstants.h"

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) {
  connect(sender, signal, SLOT(Invoked()));
  connect(sender, SIGNAL(destroyed()), SLOT(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) {
  int msec = (60 + (qrand() % 60)) * kMsecPerSec;
  DoAfter(receiver, slot, msec);
}

void DoAfter(std::function<void()> callback, int msec) {
  QTimer* timer = new QTimer;
  timer->setSingleShot(true);
  NewClosure(timer, SIGNAL(timeout()), callback);
  QObject::connect(timer, SIGNAL(timeout()), timer, SLOT(deleteLater()));
  timer->start(msec);
}