/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014-2017,  The University of Memphis,
 *                           Regents of the University of California,
 *                           Arizona Board of Regents.
 *
 * This file is part of NLSR (Named-data Link State Routing).
 * See AUTHORS.md for complete list of NLSR authors and contributors.
 *
 * NLSR 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.
 *
 * NLSR 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
 * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 **/

#include "test-common.hpp"

#include "route/routing-table-calculator.hpp"

#include "adjacency-list.hpp"
#include "lsa.hpp"
#include "lsdb.hpp"
#include "nlsr.hpp"
#include "route/map.hpp"
#include "route/routing-table.hpp"

#include <boost/test/unit_test.hpp>

#include <ndn-cxx/util/dummy-client-face.hpp>

namespace nlsr {
namespace test {

using std::shared_ptr;
using ndn::time::system_clock;
static const system_clock::TimePoint MAX_TIME = system_clock::TimePoint::max();

class HyperbolicCalculatorFixture : public BaseFixture
{
public:
  HyperbolicCalculatorFixture()
    : face(std::make_shared<ndn::util::DummyClientFace>())
    , nlsr(g_ioService, g_scheduler, std::ref(*face), g_keyChain)
    , routingTable(nlsr.getRoutingTable())
    , adjacencies(nlsr.getAdjacencyList())
    , lsdb(nlsr.getLsdb())
  {
    setUpTopology();
  }

  // Triangle topology with routers A, B, C connected
  void setUpTopology()
  {
    INIT_LOGGERS("/tmp", "TRACE");

    Adjacent a(ROUTER_A_NAME, ROUTER_A_FACE, 0, Adjacent::STATUS_ACTIVE, 0, 0);
    Adjacent b(ROUTER_B_NAME, ROUTER_B_FACE, 0, Adjacent::STATUS_ACTIVE, 0, 0);
    Adjacent c(ROUTER_C_NAME, ROUTER_C_FACE, 0, Adjacent::STATUS_ACTIVE, 0, 0);

    // Router A
    adjacencies.insert(b);
    adjacencies.insert(c);

    AdjLsa adjA(a.getName(), 1, MAX_TIME, 2, adjacencies);
    lsdb.installAdjLsa(adjA);

    CoordinateLsa coordA(adjA.getOrigRouter(), 1, MAX_TIME, 16.23, 2.97);
    lsdb.installCoordinateLsa(coordA);

    // Router B
    a.setFaceId(1);
    c.setFaceId(2);

    AdjacencyList adjacencyListB;
    adjacencyListB.insert(a);
    adjacencyListB.insert(c);

    AdjLsa adjB(b.getName(), 1, MAX_TIME, 2, adjacencyListB);
    lsdb.installAdjLsa(adjB);

    CoordinateLsa coordB(adjB.getOrigRouter(), 1, MAX_TIME, 16.59, 3.0);
    lsdb.installCoordinateLsa(coordB);

    // Router C
    a.setFaceId(1);
    b.setFaceId(2);

    AdjacencyList adjacencyListC;
    adjacencyListC.insert(a);
    adjacencyListC.insert(b);

    AdjLsa adjC(c.getName(), 1, MAX_TIME, 2, adjacencyListC);
    lsdb.installAdjLsa(adjC);

    CoordinateLsa coordC(adjC.getOrigRouter(), 1, MAX_TIME, 14.11, 2.99);
    lsdb.installCoordinateLsa(coordC);

    map.createFromAdjLsdb(nlsr);
  }

public:
  std::shared_ptr<ndn::util::DummyClientFace> face;
  Nlsr nlsr;
  Map map;

  RoutingTable& routingTable;
  AdjacencyList& adjacencies;
  Lsdb& lsdb;

  static const ndn::Name ROUTER_A_NAME;
  static const ndn::Name ROUTER_B_NAME;
  static const ndn::Name ROUTER_C_NAME;

  static const std::string ROUTER_A_FACE;
  static const std::string ROUTER_B_FACE;
  static const std::string ROUTER_C_FACE;
};

const ndn::Name HyperbolicCalculatorFixture::ROUTER_A_NAME = "/ndn/router/a";
const ndn::Name HyperbolicCalculatorFixture::ROUTER_B_NAME = "/ndn/router/b";
const ndn::Name HyperbolicCalculatorFixture::ROUTER_C_NAME = "/ndn/router/c";

const std::string HyperbolicCalculatorFixture::ROUTER_A_FACE = "face-a";
const std::string HyperbolicCalculatorFixture::ROUTER_B_FACE = "face-b";
const std::string HyperbolicCalculatorFixture::ROUTER_C_FACE = "face-c";

uint64_t
applyHyperbolicFactorAndRound(double d)
{
  // Hyperbolic costs in the tests were calculated with 1*10^-9 precision.
  // A factor larger than 1*10^9 will cause the tests to fail.
  BOOST_REQUIRE(NextHop::HYPERBOLIC_COST_ADJUSTMENT_FACTOR <= 1000000000);
  return round(NextHop::HYPERBOLIC_COST_ADJUSTMENT_FACTOR*d);
}

BOOST_FIXTURE_TEST_SUITE(TestHyperbolicRoutingCalculator, HyperbolicCalculatorFixture)

BOOST_AUTO_TEST_CASE(Basic)
{
  HyperbolicRoutingCalculator calculator(map.getMapSize(), false, ROUTER_A_NAME);
  calculator.calculatePaths(map, routingTable, lsdb, adjacencies);

  RoutingTableEntry* entryB = routingTable.findRoutingTableEntry(ROUTER_B_NAME);

  // Router A should be able to get to B through B with cost 0 and to B through C
  NexthopList& bHopList = entryB->getNexthopList();
  BOOST_REQUIRE_EQUAL(bHopList.getNextHops().size(), 2);

  for (std::set<NextHop, NextHopComparator>::iterator it = bHopList.begin(); it != bHopList.end(); ++it) {
    std::string faceUri = it->getConnectingFaceUri();
    uint64_t cost = it->getRouteCostAsAdjustedInteger();

    BOOST_CHECK((faceUri == ROUTER_B_FACE && cost == 0) ||
                (faceUri == ROUTER_C_FACE && cost == applyHyperbolicFactorAndRound(20.103356956)));
  }

  RoutingTableEntry* entryC = routingTable.findRoutingTableEntry(ROUTER_C_NAME);

  // Router A should be able to get to C through C with cost 0 and to C through B
  NexthopList& cHopList = entryC->getNexthopList();
  BOOST_REQUIRE_EQUAL(cHopList.getNextHops().size(), 2);

  for (std::set<NextHop, NextHopComparator>::iterator it = cHopList.begin(); it != cHopList.end(); ++it) {
    std::string faceUri = it->getConnectingFaceUri();
    uint64_t cost = it->getRouteCostAsAdjustedInteger();

    BOOST_CHECK((faceUri == ROUTER_B_FACE && cost == applyHyperbolicFactorAndRound(20.103356956)) ||
                (faceUri == ROUTER_C_FACE && cost == 0));
  }
}

BOOST_AUTO_TEST_SUITE_END()

} // namespace test
} // namespace nlsr