/*
 * ThreadManager.h
 *
 * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_CORE_THREADMANAGER_H_
#define MAD_CORE_THREADMANAGER_H_

#include "export.h"

#include <queue>
#include <map>

#include <boost/asio.hpp>

#include <boost/function.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/condition_variable.hpp>
#include <boost/thread/locks.hpp>

namespace Mad {
namespace Core {

class Application;

class MAD_CORE_EXPORT ThreadManager : private boost::noncopyable {
  private:
    friend class Application;

    Application *application;

    boost::thread::id mainThreadId;
    boost::shared_ptr<boost::thread> workerThread, loggerThread, ioThread;
    std::map<boost::thread::id, boost::shared_ptr<boost::thread> > threads;

    boost::mutex threadLock;

    boost::mutex runLock;
    bool running;

    boost::mutex workLock;
    boost::condition_variable workCond;
    std::queue<boost::function0<void> > work;

    boost::scoped_ptr<boost::asio::io_service::work> ioWorker;

    ThreadManager(Application *application0);
    ~ThreadManager();

    void workerFunc();
    void ioFunc();

    void threadFinished(boost::thread::id threadId) {
      boost::shared_ptr<boost::thread> thread;

      {
        boost::lock_guard<boost::mutex> lock(threadLock);

        std::map<boost::thread::id, boost::shared_ptr<boost::thread> >::iterator it = threads.find(threadId);

        if(it == threads.end())
          return;

        thread = it->second;
        threads.erase(it);
      }

      thread->join();
    }

  public:
    bool isThisMainThread() {
      return (mainThreadId == boost::this_thread::get_id());
    }

    bool isThisWorkerThread() {
      boost::lock_guard<boost::mutex> lock(threadLock);
      return (workerThread->get_id() == boost::this_thread::get_id());
    }

    void detach();

    void pushWork(const boost::function0<void> &newWork);
};

}
}

#endif /* MAD_CORE_THREADMANAGER_H_ */