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#include <tuple>
#include <gtest/gtest.h>
#include "dart/dart.hpp"

using namespace dart;

//==============================================================================
TEST(ScrewJoint, ThreadPitch)
{
  using namespace dart::math::suffixes;

  // Create single-body skeleton with a screw joint
  auto skel = dynamics::Skeleton::create();
  auto pair = skel->createJointAndBodyNodePair<dart::dynamics::ScrewJoint>();
  auto screwJoint = pair.first;
  auto bodyNode = pair.second;

  // Initial settings
  screwJoint->setPosition(0, 0.0_pi);
  const Eigen::Vector3d axis = screwJoint->getAxis();
  const Eigen::Vector3d pos0 = bodyNode->getTransform().translation();

  auto pitch = 0.1;
  auto angle = 1.0_pi;
  screwJoint->setPitch(pitch);
  EXPECT_EQ(screwJoint->getPitch(), pitch);
  screwJoint->setPosition(0, angle);
  Eigen::Vector3d pos1 = bodyNode->getTransform().translation();
  Eigen::Vector3d diff = pos1 - pos0;
  Eigen::Vector3d expectedDiff = axis * pitch * angle / 2.0_pi;
  EXPECT_TRUE(diff.isApprox(expectedDiff));

  pitch = 1.23;
  angle = 4.5_pi;
  screwJoint->setPitch(pitch);
  EXPECT_EQ(screwJoint->getPitch(), pitch);
  screwJoint->setPosition(0, angle);
  pos1 = bodyNode->getTransform().translation();
  diff = pos1 - pos0;
  expectedDiff = axis * pitch * angle / 2.0_pi;
  EXPECT_TRUE(diff.isApprox(expectedDiff));
}
