/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

#include "math.h"
#include "ns3/core-module.h"
#include "ns3/test.h"

#include "ns3/leo-module.h"

using namespace ns3;

class LeoPropagationRxNoLosTestCase : public TestCase
{
public:
  LeoPropagationRxNoLosTestCase ()
    : TestCase ("Test RxNoLos for without LOS")
  {}
  virtual ~LeoPropagationRxNoLosTestCase ()
  {}

private:
  virtual void DoRun (void);
};

void
LeoPropagationRxNoLosTestCase::DoRun ()
{
  Ptr<ConstantPositionMobilityModel> a = CreateObject<ConstantPositionMobilityModel> ();
  a->SetPosition (Vector3D (6.7e6, 0, 0));
  Ptr<ConstantPositionMobilityModel> b = CreateObject<ConstantPositionMobilityModel> ();
  b->SetPosition (Vector3D (-7.0e6, 0, 0));

  Ptr<LeoPropagationLossModel> model = CreateObject<LeoPropagationLossModel> ();
  model->SetAttribute ("MaxDistance", DoubleValue (6000)); // km
  model->SetAttribute ("ElevationAngle", DoubleValue (10.0));

  NS_TEST_ASSERT_MSG_LT (model->CalcRxPower (1.0, a, b), -500.0, "0 Rx power without LOS");
}

class LeoPropagationRxLosTestCase : public TestCase
{
public:
  LeoPropagationRxLosTestCase ()
    : TestCase ("Test Rx with LOS")
  {}
  virtual ~LeoPropagationRxLosTestCase ()
  {}

private:
  virtual void DoRun (void);
};

void
LeoPropagationRxLosTestCase::DoRun ()
{
  Ptr<ConstantPositionMobilityModel> a = CreateObject<ConstantPositionMobilityModel> ();
  a->SetPosition (Vector3D (1000000.0, 0, 0));
  Ptr<ConstantPositionMobilityModel> b = CreateObject<ConstantPositionMobilityModel> ();
  b->SetPosition (Vector3D (1000001.0, 0, 0));

  Ptr<LeoPropagationLossModel> model = CreateObject<LeoPropagationLossModel> ();
  model->SetAttribute ("ElevationAngle", DoubleValue (10.0));
  model->SetAttribute ("AtmosphericLoss", DoubleValue (0.0));
  model->SetAttribute ("FreeSpacePathLoss", DoubleValue (0.0));
  model->SetAttribute ("LinkMargin", DoubleValue (0.0));

  NS_TEST_ASSERT_MSG_EQ (model->CalcRxPower (1.0, a, b), 1.0, "Tx same as Rx power without losses and LOS");
}

class LeoPropagationBadAngleTestCase : public TestCase
{
public:
  LeoPropagationBadAngleTestCase ()
    : TestCase ("Test Rx with too large elevation angle")
  {}
  virtual ~LeoPropagationBadAngleTestCase ()
  {}

private:
  virtual void DoRun (void);
};

void
LeoPropagationBadAngleTestCase::DoRun ()
{
  Ptr<ConstantPositionMobilityModel> a = CreateObject<ConstantPositionMobilityModel> ();
  a->SetPosition (Vector3D (1000000.0, 0, 0));
  Ptr<ConstantPositionMobilityModel> b = CreateObject<ConstantPositionMobilityModel> ();
  b->SetPosition (Vector3D (1000000.0, sin (M_PI / 9) * 1000000.0, 0));

  Ptr<LeoPropagationLossModel> model = CreateObject<LeoPropagationLossModel> ();
  model->SetAttribute ("ElevationAngle", DoubleValue (90));

  NS_TEST_ASSERT_MSG_LT (model->CalcRxPower (1.0, a, b), -500.0, "Tx must be 0 if elevation is too large");
}

class LeoPropagationLossTestCase : public TestCase
{
public:
  LeoPropagationLossTestCase ()
    : TestCase ("Test Rx with some losses")
  {}
  virtual ~LeoPropagationLossTestCase ()
  {}

private:
  virtual void DoRun (void);
};

void
LeoPropagationLossTestCase::DoRun ()
{
  Ptr<ConstantPositionMobilityModel> a = CreateObject<ConstantPositionMobilityModel> ();
  a->SetPosition (Vector3D (1000000.0, 0, 0));
  Ptr<ConstantPositionMobilityModel> b = CreateObject<ConstantPositionMobilityModel> ();
  b->SetPosition (Vector3D (1000001.0, 0, 0));

  Ptr<LeoPropagationLossModel> model = CreateObject<LeoPropagationLossModel> ();
  model->SetAttribute ("AtmosphericLoss", DoubleValue (0.1));
  model->SetAttribute ("FreeSpacePathLoss", DoubleValue (0.1));
  model->SetAttribute ("LinkMargin", DoubleValue (0.3));

  NS_TEST_ASSERT_MSG_EQ (model->CalcRxPower (1.0, a, b), 0.5, "Tx must be smaller with some losses");
}

class LeoPropagationTestSuite : public TestSuite
{
public:
  LeoPropagationTestSuite ();
};

LeoPropagationTestSuite::LeoPropagationTestSuite ()
  : TestSuite ("leo-propagation", UNIT)
{
  // TestDuration for TestCase can be QUICK, EXTENSIVE or TAKES_FOREVER
  AddTestCase (new LeoPropagationRxNoLosTestCase, TestCase::QUICK);
  AddTestCase (new LeoPropagationRxLosTestCase, TestCase::QUICK);
  AddTestCase (new LeoPropagationBadAngleTestCase, TestCase::QUICK);
  AddTestCase (new LeoPropagationLossTestCase, TestCase::QUICK);
}

// Do not forget to allocate an instance of this TestSuite
static LeoPropagationTestSuite leoTestSuite;