/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2007 INRIA, Gustavo Carneiro
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors: Gustavo Carneiro <gjcarneiro@gmail.com>,
 *          Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#include "ns3/test.h"
#include "ns3/object.h"
#include "ns3/object-factory.h"
#include "ns3/assert.h"

namespace {

class BaseA : public ns3::Object
{
public:
  static ns3::TypeId GetTypeId (void) {
    static ns3::TypeId tid = ns3::TypeId ("BaseA")
      .SetParent (Object::GetTypeId ())
      .HideFromDocumentation ()
      .AddConstructor<BaseA> ();
    return tid;
  }
  BaseA ()
  {}
  virtual void Dispose (void) {}
};

class DerivedA : public BaseA
{
public:
  static ns3::TypeId GetTypeId (void) {
    static ns3::TypeId tid = ns3::TypeId ("DerivedA")
      .SetParent (BaseA::GetTypeId ())
      .HideFromDocumentation ()
      .AddConstructor<DerivedA> ();
    return tid;
  }
  DerivedA ()
  {}
  virtual void Dispose (void) {
    BaseA::Dispose ();
  }
};

class BaseB : public ns3::Object
{
public:
  static ns3::TypeId GetTypeId (void) {
    static ns3::TypeId tid = ns3::TypeId ("BaseB")
      .SetParent (Object::GetTypeId ())
      .HideFromDocumentation ()
      .AddConstructor<BaseB> ();
    return tid;
  }
  BaseB ()
  {}
  virtual void Dispose (void) {}
};

class DerivedB : public BaseB
{
public:
  static ns3::TypeId GetTypeId (void) {
    static ns3::TypeId tid = ns3::TypeId ("DerivedB")
      .SetParent (BaseB::GetTypeId ())
      .HideFromDocumentation ()
      .AddConstructor<DerivedB> ();
    return tid;
  }
  DerivedB ()
  {}
  virtual void Dispose (void) {
    BaseB::Dispose ();
  }
};

NS_OBJECT_ENSURE_REGISTERED (BaseA);
NS_OBJECT_ENSURE_REGISTERED (DerivedA);
NS_OBJECT_ENSURE_REGISTERED (BaseB);
NS_OBJECT_ENSURE_REGISTERED (DerivedB);

} // namespace anonymous

namespace ns3 {

// ===========================================================================
// Test case to make sure that we can make Objects using CreateObject.
// ===========================================================================
class CreateObjectTestCase : public TestCase
{
public:
  CreateObjectTestCase ();
  virtual ~CreateObjectTestCase ();

private:
  virtual void DoRun (void);
};

CreateObjectTestCase::CreateObjectTestCase ()
  : TestCase ("Check CreateObject<Type> template function")
{
}

CreateObjectTestCase::~CreateObjectTestCase ()
{
}

void
CreateObjectTestCase::DoRun (void)
{
  Ptr<BaseA> baseA = CreateObject<BaseA> ();
  NS_TEST_ASSERT_MSG_NE (baseA, 0, "Unable to CreateObject<BaseA>");

  //
  // Since baseA is a BaseA, we must be able to successfully ask for a BaseA.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<BaseA> (), baseA, "GetObject() of same type returns different Ptr");

  //
  // Since BaseA is a BaseA and not a DerivedA, we must not find a DerivedA if we look.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<DerivedA> (), 0, "GetObject() of unrelated type returns nonzero pointer");

  //
  // Since baseA is not a BaseA, we must not be able to ask for a DerivedA even if we
  // try an implied cast back to a BaseA.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<BaseA> (DerivedA::GetTypeId ()), 0, "GetObject() of unrelated returns nonzero Ptr");

  baseA = CreateObject<DerivedA> ();
  NS_TEST_ASSERT_MSG_NE (baseA, 0, "Unable to CreateObject<DerivedA> with implicit cast to BaseA");

  //
  // If we create a DerivedA and cast it to a BaseA, then if we do a GetObject for
  // that BaseA we should get the same address (same Object).
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<BaseA> (), baseA, "Unable to GetObject<BaseA> on BaseA");

  //
  // Since we created a DerivedA and cast it to a BaseA, we should be able to 
  // get back a DerivedA and it should be the original Ptr.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<DerivedA> (), baseA, "GetObject() of the original type returns different Ptr");

  // If we created a DerivedA and cast it to a BaseA, then we GetObject for the 
  // same DerivedA and cast it back to the same BaseA, we should get the same 
  // object.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<BaseA> (DerivedA::GetTypeId ()), baseA, "GetObject returns different Ptr");
}

// ===========================================================================
// Test case to make sure that we can aggregate Objects.
// ===========================================================================
class AggregateObjectTestCase : public TestCase
{
public:
  AggregateObjectTestCase ();
  virtual ~AggregateObjectTestCase ();

private:
  virtual void DoRun (void);
};

AggregateObjectTestCase::AggregateObjectTestCase ()
  : TestCase ("Check Object aggregation functionality")
{
}

AggregateObjectTestCase::~AggregateObjectTestCase ()
{
}

void
AggregateObjectTestCase::DoRun (void)
{
  Ptr<BaseA> baseA = CreateObject<BaseA> ();
  NS_TEST_ASSERT_MSG_NE (baseA, 0, "Unable to CreateObject<BaseA>");

  Ptr<BaseB> baseB = CreateObject<BaseB> ();
  NS_TEST_ASSERT_MSG_NE (baseB, 0, "Unable to CreateObject<BaseB>");

  Ptr<BaseB> baseBCopy = baseB;
  NS_TEST_ASSERT_MSG_NE (baseBCopy, 0, "Unable to copy BaseB");

  //
  // Make an aggregation of a BaseA object and a BaseB object.
  //
  baseA->AggregateObject (baseB);

  //
  // We should be able to ask the aggregation (through baseA) for the BaseA part
  // of the aggregation.
  //
  NS_TEST_ASSERT_MSG_NE (baseA->GetObject<BaseA> (), 0, "Cannot GetObject (through baseA) for BaseA Object");

  //
  // There is no DerivedA in this picture, so we should not be able to GetObject
  // for that type.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<DerivedA> (), 0, "Unexpectedly found a DerivedA through baseA");

  //
  // We should be able to ask the aggregation (through baseA) for the BaseB part
  //
  NS_TEST_ASSERT_MSG_NE (baseA->GetObject<BaseB> (), 0, "Cannot GetObject (through baseA) for BaseB Object");

  //
  // There is no DerivedB in this picture, so we should not be able to GetObject
  // for that type.
  //
  NS_TEST_ASSERT_MSG_EQ (baseA->GetObject<DerivedB> (), 0, "Unexpectedly found a DerivedB through baseA");

  //
  // We should be able to ask the aggregation (through baseA) for the BaseB part
  //
  NS_TEST_ASSERT_MSG_NE (baseB->GetObject<BaseB> (), 0, "Cannot GetObject (through baseB) for BaseB Object");

  //
  // There is no DerivedB in this picture, so we should not be able to GetObject
  // for that type.
  //
  NS_TEST_ASSERT_MSG_EQ (baseB->GetObject<DerivedB> (), 0, "Unexpectedly found a DerivedB through baseB");

  //
  // We should be able to ask the aggregation (through baseB) for the BaseA part
  // of the aggregation.
  //
  NS_TEST_ASSERT_MSG_NE (baseB->GetObject<BaseA> (), 0, "Cannot GetObject (through baseB) for BaseA Object");

  //
  // There is no DerivedA in this picture, so we should not be able to GetObject
  // for that type.
  //
  NS_TEST_ASSERT_MSG_EQ (baseB->GetObject<DerivedA> (), 0, "Unexpectedly found a DerivedA through baseB");

  //
  // baseBCopy is a copy of the original Ptr to the Object BaseB.  Even though
  // we didn't use baseBCopy directly in the aggregations, the object to which
  // it points was used, therefore, we should be able to use baseBCopy as if
  // it were baseB and get a BaseA out of the aggregation.
  //
  NS_TEST_ASSERT_MSG_NE (baseBCopy->GetObject<BaseA> (), 0, "Cannot GetObject (through baseBCopy) for a BaseA Object");

  //
  // Now, change the underlying type of the objects to be the derived types.
  //
  baseA = CreateObject<DerivedA> ();
  NS_TEST_ASSERT_MSG_NE (baseA, 0, "Unable to CreateObject<DerivedA> with implicit cast to BaseA");

  baseB = CreateObject<DerivedB> ();
  NS_TEST_ASSERT_MSG_NE (baseB, 0, "Unable to CreateObject<DerivedB> with implicit cast to BaseB");

  //
  // Create an aggregation of two objects, both of the derived types; and leave
  // an unaggregated copy of one lying around.
  //
  baseBCopy = baseB;
  baseA->AggregateObject (baseB);

  //
  // We should be able to ask the aggregation (through baseA) for the DerivedB part
  //
  NS_TEST_ASSERT_MSG_NE (baseA->GetObject<DerivedB> (), 0, "Cannot GetObject (through baseA) for DerivedB Object");

  //
  // Since the DerivedB is also a BaseB, we should be able to ask the aggregation 
  // (through baseA) for the BaseB part
  //
  NS_TEST_ASSERT_MSG_NE (baseA->GetObject<BaseB> (), 0, "Cannot GetObject (through baseA) for BaseB Object");

  //
  // We should be able to ask the aggregation (through baseB) for the DerivedA part
  //
  NS_TEST_ASSERT_MSG_NE (baseB->GetObject<DerivedA> (), 0, "Cannot GetObject (through baseB) for DerivedA Object");

  //
  // Since the DerivedA is also a BaseA, we should be able to ask the aggregation 
  // (through baseB) for the BaseA part
  //
  NS_TEST_ASSERT_MSG_NE (baseB->GetObject<BaseA> (), 0, "Cannot GetObject (through baseB) for BaseA Object");

  //
  // baseBCopy is a copy of the original Ptr to the Object BaseB.  Even though
  // we didn't use baseBCopy directly in the aggregations, the object to which
  // it points was used, therefore, we should be able to use baseBCopy as if
  // it were baseB (same underlying Object) and get a BaseA and a DerivedA out 
  // of the aggregation through baseBCopy.
  //
  NS_TEST_ASSERT_MSG_NE (baseBCopy->GetObject<BaseA> (), 0, "Cannot GetObject (through baseBCopy) for a BaseA Object");
  NS_TEST_ASSERT_MSG_NE (baseBCopy->GetObject<DerivedA> (), 0, "Cannot GetObject (through baseBCopy) for a BaseA Object");

  //
  // Since the Ptr<BaseB> is actually a DerivedB, we should be able to ask the 
  // aggregation (through baseB) for the DerivedB part
  //
  NS_TEST_ASSERT_MSG_NE (baseB->GetObject<DerivedB> (), 0, "Cannot GetObject (through baseB) for DerivedB Object");

  //
  // Since the DerivedB was cast to a BaseB, we should be able to ask the 
  // aggregation (through baseB) for the BaseB part
  //
  NS_TEST_ASSERT_MSG_NE (baseB->GetObject<BaseB> (), 0, "Cannot GetObject (through baseB) for BaseB Object");

  //
  // Make sure reference counting works in the aggregate.  Create two Objects
  // and aggregate them, then release one of them.  The aggregation should
  // keep a reference to both and the Object we released should still be there.
  //
  baseA = CreateObject<BaseA> ();
  NS_TEST_ASSERT_MSG_NE (baseA, 0, "Unable to CreateObject<BaseA>");

  baseB = CreateObject<BaseB> ();
  NS_TEST_ASSERT_MSG_NE (baseB, 0, "Unable to CreateObject<BaseA>");

  baseA->AggregateObject (baseB);
  baseA = 0;

  baseA = baseB->GetObject<BaseA> ();
  NS_TEST_ASSERT_MSG_NE (baseA, 0, "Unable to GetObject on released object");
}

// ===========================================================================
// Test case to make sure that an Object factory can create Objects
// ===========================================================================
class ObjectFactoryTestCase : public TestCase
{
public:
  ObjectFactoryTestCase ();
  virtual ~ObjectFactoryTestCase ();

private:
  virtual void DoRun (void);
};

ObjectFactoryTestCase::ObjectFactoryTestCase ()
  : TestCase ("Check ObjectFactory functionality")
{
}

ObjectFactoryTestCase::~ObjectFactoryTestCase ()
{
}

void
ObjectFactoryTestCase::DoRun (void)
{
  ObjectFactory factory;

  //
  // Create an Object of type BaseA through an object factory.
  //
  factory.SetTypeId (BaseA::GetTypeId ());
  Ptr<Object> a = factory.Create ();
  NS_TEST_ASSERT_MSG_NE (a, 0, "Unable to factory.Create() a BaseA");

  //
  // What we made should be a BaseA, not have anything to do with a DerivedA
  //
  NS_TEST_ASSERT_MSG_EQ (a->GetObject<BaseA> (DerivedA::GetTypeId ()), 0, "BaseA is unexpectedly a DerivedA also");

  //
  // The BaseA we got should not respond to a GetObject for DerivedA
  //
  NS_TEST_ASSERT_MSG_EQ (a->GetObject<DerivedA> (), 0, "BaseA unexpectedly responds to GetObject for DerivedA");

  //
  // Now tell the factory to make DerivedA Objects and create one with an 
  // implied cast back to a BaseA
  //
  factory.SetTypeId (DerivedA::GetTypeId ());
  a = factory.Create ();

  //
  // Since the DerivedA has a BaseA part, we should be able to use GetObject to 
  // dynamically cast back to a BaseA.
  //
  NS_TEST_ASSERT_MSG_EQ (a->GetObject<BaseA> (), a, "Unable to use GetObject as dynamic_cast<BaseA>()");

  //
  // Since a is already a BaseA and is really a DerivedA, we should be able to
  // GetObject for the DerivedA and cast it back to a BaseA getting the same
  // value that is there.
  //
  NS_TEST_ASSERT_MSG_EQ (a->GetObject<BaseA> (DerivedA::GetTypeId ()), a, "GetObject with implied cast returns different Ptr");

  //
  // Since a declared a BaseA, even if it is really a DerivedA, we should not
  // be able to GetOBject for a DerivedA since this would break the type
  // declaration.
  //
  NS_TEST_ASSERT_MSG_NE (a->GetObject<DerivedA> (), 0, "Unexpectedly able to work around C++ type system");
}

// ===========================================================================
// The Test Suite that glues the Test Cases together.
// ===========================================================================
class ObjectTestSuite : public TestSuite
{
public:
  ObjectTestSuite ();
};

ObjectTestSuite::ObjectTestSuite ()
  : TestSuite ("object", UNIT)
{
  AddTestCase (new CreateObjectTestCase);
  AddTestCase (new AggregateObjectTestCase);
  AddTestCase (new ObjectFactoryTestCase);
}

static ObjectTestSuite objectTestSuite;

} // namespace ns3
