/*
 * Copyright (c) 2011-2019, The DART development contributors
 * All rights reserved.
 *
 * The list of contributors can be found at:
 *   https://github.com/dartsim/dart/blob/master/LICENSE
 *
 * This file is provided under the following "BSD-style" License:
 *   Redistribution and use in source and binary forms, with or
 *   without modification, are permitted provided that the following
 *   conditions are met:
 *   * 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
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *   CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 *   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 *   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 *   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 *   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *   POSSIBILITY OF SUCH DAMAGE.
 */

#include "MyWindow.hpp"

MyWindow::MyWindow() : SimWindow()
{
  mBackWheelVelocity = 0.0;
  mSteeringWheelAngle = 0.0;
  mK = 0.01;
  mD = 0.005;
}

MyWindow::~MyWindow()
{
}

void MyWindow::timeStepping()
{
  dart::dynamics::SkeletonPtr vehicle = mWorld->getSkeleton("car_skeleton");
  assert(vehicle != 0);

  std::size_t dof = vehicle->getNumDofs();

  Eigen::VectorXd q = vehicle->getPositions();
  Eigen::VectorXd dq = vehicle->getVelocities();
  Eigen::VectorXd tau = Eigen::VectorXd::Zero(dof);

  tau[6] = -mK * (q[6] - mSteeringWheelAngle) - mD * dq[6];
  tau[8] = -mK * (q[8] - mSteeringWheelAngle) - mD * dq[8];
  tau[7] = -mD * (dq[7] - mBackWheelVelocity);
  tau[9] = -mD * (dq[9] - mBackWheelVelocity);
  tau[10] = -mD * (dq[10] - mBackWheelVelocity);
  tau[11] = -mD * (dq[11] - mBackWheelVelocity);

  vehicle->setForces(tau);

  mWorld->step();
}

void MyWindow::drawWorld() const
{
  glEnable(GL_LIGHTING);
  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

  SimWindow::drawWorld();
}

void MyWindow::keyboard(unsigned char _key, int _x, int _y)
{

  using namespace dart::math::suffixes;

  switch (_key)
  {
    case ' ': // use space key to play or stop the motion
      mSimulating = !mSimulating;
      if (mSimulating)
        mPlay = false;
      break;
    case 'p': // playBack
      mPlay = !mPlay;
      if (mPlay)
        mSimulating = false;
      break;
    case '[': // step backward
      if (!mSimulating)
      {
        mPlayFrame--;
        if (mPlayFrame < 0)
          mPlayFrame = 0;
        glutPostRedisplay();
      }
      break;
    case ']': // step forwardward
      if (!mSimulating)
      {
        mPlayFrame++;
        if (mPlayFrame >= mWorld->getRecording()->getNumFrames())
          mPlayFrame = 0;
        glutPostRedisplay();
      }
      break;
    case 'v': // show or hide markers
      mShowMarkers = !mShowMarkers;
      break;
    case 'w': // move forward
      mBackWheelVelocity = -420.0_deg;
      break;
    case 's': // stop
      mBackWheelVelocity = 0.0_deg;
      break;
    case 'x': // move backward
      mBackWheelVelocity = +420.0_deg;
      break;
    case 'a': // rotate steering wheels to left
      mSteeringWheelAngle += +10_deg;
      if (mSteeringWheelAngle > 30.0_deg)
        mSteeringWheelAngle = 30.0_deg;
      break;
    case 'd': // rotate steering wheels to right
      mSteeringWheelAngle += -10_deg;
      if (mSteeringWheelAngle < -30.0_deg)
        mSteeringWheelAngle = -30.0_deg;
      break;
    default:
      Win3D::keyboard(_key, _x, _y);
  }
  glutPostRedisplay();
}
