/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2017 Fraunhofer ESK
 *
 * 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
 *
 * Author: Karsten Roscher <karsten.roscher@esk.fraunhofer.de>
 */
#include "traci-node-utils.h"

#include "traci-vehicle-adapter.h"
#include "traci-exception.h"

#include <ns3/assert.h>

namespace
{

ns3::Ptr<ns3::traci::Vehicle>
GetVehicleOrThrow (ns3::Ptr<ns3::Node> node)
{
  if (!node)
    {
      throw ns3::traci::NodeRequestError ("Node must not be null");
    }

  ns3::Ptr<ns3::TraCiVehicleAdapter> traciAdapter =
  	node->GetObject<ns3::TraCiVehicleAdapter> ();

  if (!traciAdapter)
    {
      throw ns3::traci::NodeRequestError ("TraCiVehicleAdapter is missing");
    }

  ns3::Ptr<ns3::traci::Vehicle> vehicle = traciAdapter->GetVehicle ();

  if (!vehicle)
    {
      throw ns3::traci::NodeRequestError("TraCiVehicleAdapter has no vehicle set");
    }

  return vehicle;
}

}  // namespace


namespace ns3
{
namespace traci
{

Position2D
GetPosition (Ptr<Node> node)
{
  NS_ASSERT_MSG (node, "Node must not be null");
  Ptr<traci::Vehicle> vehicle = GetVehicleOrThrow (node);
  NS_ASSERT (vehicle);
  return vehicle->GetPosition2d ();
}


double
GetRoadDistance (Ptr<Node> from, Ptr<Node> to)
{
  NS_ASSERT_MSG (from, "Node 'from' must not be null");
  NS_ASSERT_MSG (to, "Node 'to' must not be null");

  Ptr<traci::Vehicle> vehicleFrom = GetVehicleOrThrow (from);
  Ptr<traci::Vehicle> vehicleTo = GetVehicleOrThrow (to);

  Ptr<TraCi> traci = vehicleFrom->GetTraCi ();
  NS_ASSERT_MSG (traci, "TraCi not available from vehicle");

  return traci->GetDistance (vehicleFrom->GetPosition2d (), vehicleTo->GetPosition2d (), true);

}


double
GetMinRoadDistance (Ptr<Node> a, Ptr<Node> b)
{
  NS_ASSERT_MSG (a, "Node 'a' must not be null");
  NS_ASSERT_MSG (b, "Node 'b' must not be null");

  Ptr<traci::Vehicle> vehicleA = GetVehicleOrThrow (a);
  Ptr<traci::Vehicle> vehicleB = GetVehicleOrThrow (b);

  Position2D posA = vehicleA->GetPosition2d ();
  Position2D posB = vehicleB->GetPosition2d ();

  Ptr<TraCi> traci = vehicleA->GetTraCi ();
  NS_ASSERT_MSG (traci, "TraCi not available from vehicle");

  return std::min (traci->GetDistance (posA, posB, true),
		   traci->GetDistance (posB, posA, true));
}

}  // namespace traci
}  // namespace ns3