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#include <TestHelpers.hpp>
#include <gtest/gtest.h>

#include <dart/collision/bullet/BulletCollisionDetector.hpp>
#include <dart/dynamics/BoxShape.hpp>
#include <dart/dynamics/FreeJoint.hpp>
#include <dart/dynamics/PlaneShape.hpp>
#include <dart/dynamics/Skeleton.hpp>
#include <dart/dynamics/SphereShape.hpp>
#include <dart/dynamics/WeldJoint.hpp>
#include <dart/simulation/World.hpp>

//==============================================================================
TEST(Issue1184, Accuracy)
{

  struct ShapeInfo
  {
    dart::dynamics::ShapePtr shape;
    double offset;
  };

  std::function<ShapeInfo()> makePlaneGround = []() {
    return ShapeInfo{std::make_shared<dart::dynamics::PlaneShape>(
                         Eigen::Vector3d::UnitZ(), 0.0),
                     0.0};
  };

  std::function<ShapeInfo()> makeBoxGround = []() {
    const double thickness = 0.1;
    return ShapeInfo{std::make_shared<dart::dynamics::BoxShape>(
                         Eigen::Vector3d(100.0, 100.0, thickness)),
                     -thickness / 2.0};
  };

  std::function<dart::dynamics::ShapePtr(double)> makeBoxObject
      = [](const double s) -> dart::dynamics::ShapePtr {
    return std::make_shared<dart::dynamics::BoxShape>(
        Eigen::Vector3d::Constant(2 * s));
  };

  std::function<dart::dynamics::ShapePtr(double)> makeSphereObject
      = [](const double s) -> dart::dynamics::ShapePtr {
    return std::make_shared<dart::dynamics::SphereShape>(s);
  };

#ifndef NDEBUG
  const auto groundInfoFunctions = {makePlaneGround};
  const auto objectShapeFunctions = {makeSphereObject};
  const auto halfsizes = {10.0};
  const auto fallingModes = {true};
  const double dropHeight = 0.1;
  const double tolerance = 1e-3;
#else
  const auto groundInfoFunctions = {makePlaneGround, makeBoxGround};
  const auto objectShapeFunctions = {makeBoxObject, makeSphereObject};
  const auto halfsizes = {0.25, 1.0, 5.0, 10.0, 20.0};
  const auto fallingModes = {true, false};
  const double dropHeight = 1.0;
  const double tolerance = 1e-3;
#endif

  for (const auto& groundInfoFunction : groundInfoFunctions)
  {
    for (const auto& objectShapeFunction : objectShapeFunctions)
    {
      for (const double halfsize : halfsizes)
      {
        for (const bool falling : fallingModes)
        {
          auto world = dart::simulation::World::create("test");
          world->getConstraintSolver()->setCollisionDetector(
              dart::collision::BulletCollisionDetector::create());

          Eigen::Isometry3d tf_object = Eigen::Isometry3d::Identity();
          const double initialHeight
              = falling ? dropHeight + halfsize : halfsize;
          tf_object.translate(initialHeight * Eigen::Vector3d::UnitZ());

          auto object = dart::dynamics::Skeleton::create("ball");
          object->createJointAndBodyNodePair<dart::dynamics::FreeJoint>()
              .first->setTransform(tf_object);

          const auto objectShape = objectShapeFunction(halfsize);
          object->getBodyNode(0)
              ->createShapeNodeWith<
                  dart::dynamics::VisualAspect,
                  dart::dynamics::CollisionAspect>(objectShape);

          world->addSkeleton(object);

          const ShapeInfo groundInfo = groundInfoFunction();
          auto ground = dart::dynamics::Skeleton::create("ground");
          ground->createJointAndBodyNodePair<dart::dynamics::WeldJoint>()
              .second->createShapeNodeWith<
                  dart::dynamics::VisualAspect,
                  dart::dynamics::CollisionAspect>(groundInfo.shape);

          Eigen::Isometry3d tf_ground = Eigen::Isometry3d::Identity();
          tf_ground.translate(groundInfo.offset * Eigen::Vector3d::UnitZ());
          ground->getJoint(0)->setTransformFromParentBodyNode(tf_ground);

          world->addSkeleton(ground);

          // time until the object will strike
          const double t_strike
              = falling ? sqrt(-2.0 * dropHeight / world->getGravity()[2])
                        : 0.0;

          // give the object some time to settle
          const double min_time = 0.5;
          const double t_limit = 30.0 * t_strike + min_time;

          double lowestHeight = std::numeric_limits<double>::infinity();
          double time = 0.0;
          while (time < t_limit)
          {
            world->step();
            const double currentHeight
                = object->getBodyNode(0)->getTransform().translation()[2];

            if (currentHeight < lowestHeight)
              lowestHeight = currentHeight;

            time = world->getTime();
          }

          // The simulation should have run for at least two seconds
          ASSERT_LE(min_time, time);

          EXPECT_GE(halfsize + tolerance, lowestHeight)
              << "object type: " << objectShape->getType()
              << "\nground type: " << groundInfo.shape->getType()
              << "\nfalling: " << falling << "\n";

          const double finalHeight
              = object->getBodyNode(0)->getTransform().translation()[2];

          EXPECT_NEAR(halfsize, finalHeight, tolerance)
              << "object type: " << objectShape->getType()
              << "\nground type: " << groundInfo.shape->getType()
              << "\nfalling: " << falling << "\n";
        }
      }
    }
  }
}
