/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 *
 * This program 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.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. You must obey the GNU General Public License
 * in all respects for all of the code used other than "OpenSSL". If you
 * modify file(s) with this exception, you may extend this exception to
 * your version of the file(s), but you are not obligated to do so. If
 * you do not wish to do so, delete this exception statement from your
 * version. If you delete this exception statement from all source files
 * in the program, then also delete it here.
 * 
 * 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "../Core/MultiThreading/ThreadedCommandProcessor.h"
#include "../Core/MultiThreading/ArrayFilledByThreads.h"


using namespace Orthanc;

namespace
{
  class DynamicInteger : public ICommand
  {
  private:
    int value_;
    std::set<int>& target_;

  public:
    DynamicInteger(int value, std::set<int>& target) : 
      value_(value), target_(target)
    {
    }

    int GetValue() const
    {
      return value_;
    }

    virtual bool Execute()
    {
      static boost::mutex mutex;
      boost::mutex::scoped_lock lock(mutex);
      target_.insert(value_);
      return true;
    }
  };

  class MyFiller : public ArrayFilledByThreads::IFiller
  {
  private:
    int size_;
    unsigned int created_;
    std::set<int> set_;

  public:
    MyFiller(int size) : size_(size), created_(0)
    {
    }

    virtual size_t GetFillerSize()
    {
      return size_;
    }

    virtual IDynamicObject* GetFillerItem(size_t index)
    {
      static boost::mutex mutex;
      boost::mutex::scoped_lock lock(mutex);
      created_++;
      return new DynamicInteger(index * 2, set_);
    }

    unsigned int GetCreatedCount() const
    {
      return created_;
    }

    std::set<int> GetSet()
    {
      return set_;
    }    
  };
}



TEST(MultiThreading, ArrayFilledByThreadEmpty)
{
  MyFiller f(0);
  ArrayFilledByThreads a(f);
  a.SetThreadCount(1);
  ASSERT_EQ(0, a.GetSize());
}


TEST(MultiThreading, ArrayFilledByThread1)
{
  MyFiller f(100);
  ArrayFilledByThreads a(f);
  a.SetThreadCount(1);
  ASSERT_EQ(100, a.GetSize());
  for (size_t i = 0; i < a.GetSize(); i++)
  {
    ASSERT_EQ(2 * i, dynamic_cast<DynamicInteger&>(a.GetItem(i)).GetValue());
  }
}


TEST(MultiThreading, ArrayFilledByThread4)
{
  MyFiller f(100);
  ArrayFilledByThreads a(f);
  a.SetThreadCount(4);
  ASSERT_EQ(100, a.GetSize());
  for (size_t i = 0; i < a.GetSize(); i++)
  {
    ASSERT_EQ(2 * i, dynamic_cast<DynamicInteger&>(a.GetItem(i)).GetValue());
  }

  ASSERT_EQ(100u, f.GetCreatedCount());

  a.Invalidate();

  ASSERT_EQ(100, a.GetSize());
  ASSERT_EQ(200u, f.GetCreatedCount());
  ASSERT_EQ(4u, a.GetThreadCount());
  ASSERT_TRUE(f.GetSet().empty());

  for (size_t i = 0; i < a.GetSize(); i++)
  {
    ASSERT_EQ(2 * i, dynamic_cast<DynamicInteger&>(a.GetItem(i)).GetValue());
  }
}




TEST(MultiThreading, CommandProcessor)
{
  ThreadedCommandProcessor p(4);

  std::set<int> s;

  for (size_t i = 0; i < 100; i++)
  {
    p.Post(new DynamicInteger(i * 2, s));
  }

  p.Join();

  for (size_t i = 0; i < 200; i++)
  {
    if (i % 2)
      ASSERT_TRUE(s.find(i) == s.end());
    else
      ASSERT_TRUE(s.find(i) != s.end());
  }
}