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/** @author Jeongseok Lee */

#include <gtest/gtest.h>
#include <Eigen/Core>
#include <unsupported/Eigen/AutoDiff>
#include "fcl/narrowphase/distance.h"

using namespace fcl;

//==============================================================================
template <typename S>
S getDistance(const Vector3<S>& p)
{
  detail::GJKSolver_libccd<S> solver;

  S dist;

  Sphere<S> s1(20);
  Sphere<S> s2(10);

  Transform3<S> tf1 = Transform3<S>::Identity();
  Transform3<S> tf2 = Transform3<S>::Identity();

  tf2.translation() = p;

  solver.shapeDistance(s1, tf1, s2, tf2, &dist);

  return dist;
}

//==============================================================================
template <typename S>
void test_basic()
{
  using derivative_t = Eigen::Matrix<S, 3, 1>;
  using scalar_t = Eigen::AutoDiffScalar<derivative_t>;
  using input_t = Eigen::Matrix<scalar_t, 3, 1>;

  input_t pos(40, 0, 0);
  pos(0).derivatives() = derivative_t::Unit(3, 0);
  pos(1).derivatives() = derivative_t::Unit(3, 1);
  pos(2).derivatives() = derivative_t::Unit(3, 2);

  auto dist = getDistance(pos);
  EXPECT_EQ(dist, (S)10);
  EXPECT_EQ(dist.value(), (S)10);
  EXPECT_EQ(dist.derivatives(), Vector3<S>(1, 0, 0));

  pos << 0, 40, 0;
  pos(0).derivatives() = derivative_t::Unit(3, 0);
  pos(1).derivatives() = derivative_t::Unit(3, 1);
  pos(2).derivatives() = derivative_t::Unit(3, 2);
  dist = getDistance(pos);
  EXPECT_EQ(dist, (S)10);
  EXPECT_EQ(dist.value(), (S)10);
  EXPECT_EQ(dist.derivatives(), Vector3<S>(0, 1, 0));

  pos << 0, 0, 40;
  pos(0).derivatives() = derivative_t::Unit(3, 0);
  pos(1).derivatives() = derivative_t::Unit(3, 1);
  pos(2).derivatives() = derivative_t::Unit(3, 2);
  dist = getDistance(pos);
  EXPECT_EQ(dist, (S)10);
  EXPECT_EQ(dist.value(), (S)10);
  EXPECT_EQ(dist.derivatives(), Vector3<S>(0, 0, 1));
}

//==============================================================================
GTEST_TEST(FCL_AUTO_DIFF, basic)
{
//  test_basic<float>();
  test_basic<double>();
}

//==============================================================================
int main(int argc, char* argv[])
{
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}