/*
 * Copyright (c) 2011-2019, The DART development contributors
 * All rights reserved.
 *
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 *   https://github.com/dartsim/dart/blob/master/LICENSE
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 *   without modification, are permitted provided that the following
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 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
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 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
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 *   CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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 */

#include "dart/dynamics/TranslationalJoint.hpp"

#include <string>

#include "dart/math/Geometry.hpp"
#include "dart/math/Helpers.hpp"

namespace dart {
namespace dynamics {

//==============================================================================
TranslationalJoint::Properties::Properties(const Base::Properties& _properties)
  : Base::Properties(_properties)
{
  // Do nothing
}

//==============================================================================
TranslationalJoint::~TranslationalJoint()
{
  // Do nothing
}

//==============================================================================
Eigen::Matrix<double, 6, 3> TranslationalJoint::getRelativeJacobianStatic(
    const Eigen::Vector3d& /*_positions*/) const
{
  // The Jacobian is always constant w.r.t. the generalized coordinates.
  return getRelativeJacobianStatic();
}

//==============================================================================
TranslationalJoint::Properties
TranslationalJoint::getTranslationalJointProperties() const
{
  return getGenericJointProperties();
}

//==============================================================================
TranslationalJoint::TranslationalJoint(const Properties& properties)
  : Base(properties)
{
  // Inherited Aspects must be created in the final joint class in reverse order
  // or else we get pure virtual function calls
  createGenericJointAspect(properties);
  createJointAspect(properties);
}

//==============================================================================
Joint* TranslationalJoint::clone() const
{
  return new TranslationalJoint(getTranslationalJointProperties());
}

//==============================================================================
const std::string& TranslationalJoint::getType() const
{
  return getStaticType();
}

//==============================================================================
const std::string& TranslationalJoint::getStaticType()
{
  static const std::string name = "TranslationalJoint";
  return name;
}

//==============================================================================
bool TranslationalJoint::isCyclic(std::size_t /*_index*/) const
{
  return false;
}

//==============================================================================
void TranslationalJoint::updateDegreeOfFreedomNames()
{
  if (!mDofs[0]->isNamePreserved())
    mDofs[0]->setName(Joint::mAspectProperties.mName + "_x", false);
  if (!mDofs[1]->isNamePreserved())
    mDofs[1]->setName(Joint::mAspectProperties.mName + "_y", false);
  if (!mDofs[2]->isNamePreserved())
    mDofs[2]->setName(Joint::mAspectProperties.mName + "_z", false);
}

//==============================================================================
void TranslationalJoint::updateRelativeTransform() const
{
  mT = Joint::mAspectProperties.mT_ParentBodyToJoint
       * Eigen::Translation3d(getPositionsStatic())
       * Joint::mAspectProperties.mT_ChildBodyToJoint.inverse();

  // Verification
  assert(math::verifyTransform(mT));
}

//==============================================================================
void TranslationalJoint::updateRelativeJacobian(bool _mandatory) const
{
  if (_mandatory)
  {
    mJacobian.bottomRows<3>()
        = Joint::mAspectProperties.mT_ChildBodyToJoint.linear();

    // Verification
    assert(mJacobian.topRows<3>() == Eigen::Matrix3d::Zero());
    assert(!math::isNan(mJacobian.bottomRows<3>()));
  }
}

//==============================================================================
void TranslationalJoint::updateRelativeJacobianTimeDeriv() const
{
  // Time derivative of translational joint is always zero
  assert(mJacobianDeriv == (Eigen::Matrix<double, 6, 3>::Zero()));
}

} // namespace dynamics
} // namespace dart
