/*
 * Software License Agreement (BSD License)
 *
 *  Copyright (c) 2011-2014, Willow Garage, Inc.
 *  Copyright (c) 2014-2016, Open Source Robotics Foundation
 *  All rights reserved.
 *
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 *  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.
 *   * Neither the name of Open Source Robotics Foundation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 */

/** @author Jia Pan */

#ifndef TEST_FCL_UTILITY_H
#define TEST_FCL_UTILITY_H

#include <array>
#include <fstream>
#include <iostream>

#include "fcl/common/unused.h"

#include "fcl/math/constants.h"
#include "fcl/math/triangle.h"

#include "fcl/geometry/shape/box.h"
#include "fcl/geometry/shape/sphere.h"
#include "fcl/geometry/shape/cylinder.h"
#include "fcl/geometry/bvh/BVH_model.h"
#include "fcl/geometry/octree/octree.h"

#include "fcl/narrowphase/collision.h"
#include "fcl/narrowphase/distance.h"
#include "fcl/narrowphase/collision_object.h"
#include "fcl/narrowphase/collision_result.h"
#include "fcl/narrowphase/continuous_collision_object.h"
#include "fcl/narrowphase/continuous_collision_request.h"
#include "fcl/narrowphase/continuous_collision_result.h"

#ifdef _WIN32
#define NOMINMAX  // required to avoid compilation errors with Visual Studio 2010
#include <windows.h>
#else
#include <sys/time.h>
#endif

namespace fcl
{

namespace test
{

class Timer
{
public:
  Timer();
  ~Timer();

  void start();                               ///< start timer
  void stop();                                ///< stop the timer
  double getElapsedTime();                    ///< get elapsed time in milli-second
  double getElapsedTimeInSec();               ///< get elapsed time in second (same as getElapsedTime)
  double getElapsedTimeInMilliSec();          ///< get elapsed time in milli-second
  double getElapsedTimeInMicroSec();          ///< get elapsed time in micro-second

private:
  double startTimeInMicroSec;                 ///< starting time in micro-second
  double endTimeInMicroSec;                   ///< ending time in micro-second
  int stopped;                                ///< stop flag
#ifdef _WIN32
  LARGE_INTEGER frequency;                    ///< ticks per second
  LARGE_INTEGER startCount;
  LARGE_INTEGER endCount;
#else
  timeval startCount;
  timeval endCount;
#endif
};

struct TStruct
{
  std::vector<double> records;
  double overall_time;

  TStruct() { overall_time = 0; }

  void push_back(double t)
  {
    records.push_back(t);
    overall_time += t;
  }
};

/// @brief Load an obj mesh file
template <typename S>
void loadOBJFile(const char* filename, std::vector<Vector3<S>>& points, std::vector<Triangle>& triangles);

template <typename S>
void saveOBJFile(const char* filename, std::vector<Vector3<S>>& points, std::vector<Triangle>& triangles);

template <typename S>
S rand_interval(S rmin, S rmax);

template <typename S>
void eulerToMatrix(S a, S b, S c, Matrix3<S>& R);

/// @brief Generate one random transform whose translation is constrained by extents and rotation without constraints.
/// The translation is (x, y, z), and extents[0] <= x <= extents[3], extents[1] <= y <= extents[4], extents[2] <= z <= extents[5]
template <typename S>
void generateRandomTransform(S extents[6], Transform3<S>& transform);

/// @brief Generate n random transforms whose translations are constrained by extents.
template <typename S>
void generateRandomTransforms(S extents[6], aligned_vector<Transform3<S>>& transforms, std::size_t n);

/// @brief Generate n random transforms whose translations are constrained by extents. Also generate another transforms2 which have additional random translation & rotation to the transforms generated.
template <typename S>
void generateRandomTransforms(S extents[6], S delta_trans[3], S delta_rot, aligned_vector<Transform3<S>>& transforms, aligned_vector<Transform3<S>>& transforms2, std::size_t n);

/// @brief Generate n random tranforms and transform2 with addtional random translation/rotation. The transforms and transform2 are used as initial and goal configurations for the first mesh. The second mesh is in I. This is used for continuous collision detection checking.
template <typename S>
void generateRandomTransforms_ccd(S extents[6], aligned_vector<Transform3<S>>& transforms, aligned_vector<Transform3<S>>& transforms2, S delta_trans[3], S delta_rot, std::size_t n,
                                 const std::vector<Vector3<S>>& vertices1, const std::vector<Triangle>& triangles1,
                                 const std::vector<Vector3<S>>& vertices2, const std::vector<Triangle>& triangles2);

/// @brief Generate environment with 3 * n objects: n boxes, n spheres and n cylinders.
template <typename S>
void generateEnvironments(std::vector<CollisionObject<S>*>& env, S env_scale, std::size_t n);

/// @brief Generate environment with 3 * n objects, but all in meshes.
template <typename S>
void generateEnvironmentsMesh(std::vector<CollisionObject<S>*>& env, S env_scale, std::size_t n);

/// @brief Structure for minimum distance between two meshes and the corresponding nearest point pair
template <typename S>
struct DistanceRes
{
  S distance;
  Vector3<S> p1;
  Vector3<S> p2;
};

std::string getNodeTypeName(NODE_TYPE node_type);

std::string getGJKSolverName(GJKSolverType solver_type);

#if FCL_HAVE_OCTOMAP

/// @brief Generate boxes from the octomap
template <typename S>
void generateBoxesFromOctomap(std::vector<CollisionObject<S>*>& env, OcTree<S>& tree);

/// @brief Generate boxes from the octomap
template <typename S>
void generateBoxesFromOctomapMesh(std::vector<CollisionObject<S>*>& env, OcTree<S>& tree);

/// @brief Generate an octree
octomap::OcTree* generateOcTree(double resolution = 0.1);

#endif

//============================================================================//
//                                                                            //
//                              Implementations                               //
//                                                                            //
//============================================================================//

//==============================================================================
template <typename S>
void loadOBJFile(const char* filename, std::vector<Vector3<S>>& points, std::vector<Triangle>& triangles)
{

  FILE* file = fopen(filename, "rb");
  if(!file)
  {
    std::cerr << "file not exist" << std::endl;
    return;
  }

  bool has_normal = false;
  bool has_texture = false;
  char line_buffer[2000];
  while(fgets(line_buffer, 2000, file))
  {
    char* first_token = strtok(line_buffer, "\r\n\t ");
    if(!first_token || first_token[0] == '#' || first_token[0] == 0)
      continue;

    switch(first_token[0])
    {
    case 'v':
      {
        if(first_token[1] == 'n')
        {
          strtok(nullptr, "\t ");
          strtok(nullptr, "\t ");
          strtok(nullptr, "\t ");
          has_normal = true;
        }
        else if(first_token[1] == 't')
        {
          strtok(nullptr, "\t ");
          strtok(nullptr, "\t ");
          has_texture = true;
        }
        else
        {
          S x = (S)atof(strtok(nullptr, "\t "));
          S y = (S)atof(strtok(nullptr, "\t "));
          S z = (S)atof(strtok(nullptr, "\t "));
          points.emplace_back(x, y, z);
        }
      }
      break;
    case 'f':
      {
        Triangle tri;
        char* data[30];
        int n = 0;
        while((data[n] = strtok(nullptr, "\t \r\n")) != nullptr)
        {
          if(strlen(data[n]))
            n++;
        }

        for(int t = 0; t < (n - 2); ++t)
        {
          if((!has_texture) && (!has_normal))
          {
            tri[0] = atoi(data[0]) - 1;
            tri[1] = atoi(data[1]) - 1;
            tri[2] = atoi(data[2]) - 1;
          }
          else
          {
            const char *v1;
            for(int i = 0; i < 3; i++)
            {
              // vertex ID
              if(i == 0)
                v1 = data[0];
              else
                v1 = data[t + i];

              tri[i] = atoi(v1) - 1;
            }
          }
          triangles.push_back(tri);
        }
      }
    }
  }
}

//==============================================================================
template <typename S>
void saveOBJFile(const char* filename, std::vector<Vector3<S>>& points, std::vector<Triangle>& triangles)
{
  std::ofstream os(filename);
  if(!os)
  {
    std::cerr << "file not exist" << std::endl;
    return;
  }

  for(std::size_t i = 0; i < points.size(); ++i)
  {
    os << "v " << points[i][0] << " " << points[i][1] << " " << points[i][2] << std::endl;
  }

  for(std::size_t i = 0; i < triangles.size(); ++i)
  {
    os << "f " << triangles[i][0] + 1 << " " << triangles[i][1] + 1 << " " << triangles[i][2] + 1 << std::endl;
  }

  os.close();
}

//==============================================================================
template <typename S>
S rand_interval(S rmin, S rmax)
{
  S t = rand() / ((S)RAND_MAX + 1);
  return (t * (rmax - rmin) + rmin);
}

//==============================================================================
template <typename S>
void eulerToMatrix(S a, S b, S c, Matrix3<S>& R)
{
  auto c1 = std::cos(a);
  auto c2 = std::cos(b);
  auto c3 = std::cos(c);
  auto s1 = std::sin(a);
  auto s2 = std::sin(b);
  auto s3 = std::sin(c);

  R << c1 * c2, - c2 * s1, s2,
      c3 * s1 + c1 * s2 * s3, c1 * c3 - s1 * s2 * s3, - c2 * s3,
      s1 * s3 - c1 * c3 * s2, c3 * s1 * s2 + c1 * s3, c2 * c3;
}

//==============================================================================
template <typename S>
void generateRandomTransform(const std::array<S, 6>& extents, Transform3<S>& transform)
{
  auto x = rand_interval(extents[0], extents[3]);
  auto y = rand_interval(extents[1], extents[4]);
  auto z = rand_interval(extents[2], extents[5]);

  const auto pi = constants<S>::pi();
  auto a = rand_interval((S)0, 2 * pi);
  auto b = rand_interval((S)0, 2 * pi);
  auto c = rand_interval((S)0, 2 * pi);

  Matrix3<S> R;
  eulerToMatrix(a, b, c, R);
  Vector3<S> T(x, y, z);
  transform.linear() = R;
  transform.translation() = T;
}

//==============================================================================
template <typename S>
void generateRandomTransforms(S extents[6], aligned_vector<Transform3<S>>& transforms, std::size_t n)
{
  transforms.resize(n);
  for(std::size_t i = 0; i < n; ++i)
  {
    auto x = rand_interval(extents[0], extents[3]);
    auto y = rand_interval(extents[1], extents[4]);
    auto z = rand_interval(extents[2], extents[5]);

    const auto pi = constants<S>::pi();
    auto a = rand_interval((S)0, 2 * pi);
    auto b = rand_interval((S)0, 2 * pi);
    auto c = rand_interval((S)0, 2 * pi);

    {
      Matrix3<S> R;
      eulerToMatrix(a, b, c, R);
      Vector3<S> T(x, y, z);
      transforms[i].setIdentity();
      transforms[i].linear() = R;
      transforms[i].translation() = T;
    }
  }
}

//==============================================================================
template <typename S>
void generateRandomTransforms(S extents[6], S delta_trans[3], S delta_rot, aligned_vector<Transform3<S>>& transforms, aligned_vector<Transform3<S>>& transforms2, std::size_t n)
{
  transforms.resize(n);
  transforms2.resize(n);
  for(std::size_t i = 0; i < n; ++i)
  {
    auto x = rand_interval(extents[0], extents[3]);
    auto y = rand_interval(extents[1], extents[4]);
    auto z = rand_interval(extents[2], extents[5]);

    const auto pi = constants<S>::pi();
    auto a = rand_interval((S)0, 2 * pi);
    auto b = rand_interval((S)0, 2 * pi);
    auto c = rand_interval((S)0, 2 * pi);

    {
      Matrix3<S> R;
      eulerToMatrix(a, b, c, R);
      Vector3<S> T(x, y, z);
      transforms[i].setIdentity();
      transforms[i].linear() = R;
      transforms[i].translation() = T;
    }

    auto deltax = rand_interval(-delta_trans[0], delta_trans[0]);
    auto deltay = rand_interval(-delta_trans[1], delta_trans[1]);
    auto deltaz = rand_interval(-delta_trans[2], delta_trans[2]);

    auto deltaa = rand_interval(-delta_rot, delta_rot);
    auto deltab = rand_interval(-delta_rot, delta_rot);
    auto deltac = rand_interval(-delta_rot, delta_rot);

    {
      Matrix3<S> R;
      eulerToMatrix(a + deltaa, b + deltab, c + deltac, R);
      Vector3<S> T(x + deltax, y + deltay, z + deltaz);
      transforms2[i].setIdentity();
      transforms2[i].linear() = R;
      transforms2[i].translation() = T;
    }
  }
}

//==============================================================================
template <typename S>
void generateRandomTransforms_ccd(S extents[6], aligned_vector<Transform3<S>>& transforms, aligned_vector<Transform3<S>>& transforms2, S delta_trans[3], S delta_rot, std::size_t n,
                                 const std::vector<Vector3<S>>& vertices1, const std::vector<Triangle>& triangles1,
                                 const std::vector<Vector3<S>>& vertices2, const std::vector<Triangle>& triangles2)
{
  FCL_UNUSED(vertices1);
  FCL_UNUSED(triangles1);
  FCL_UNUSED(vertices2);
  FCL_UNUSED(triangles2);

  transforms.resize(n);
  transforms2.resize(n);

  for(std::size_t i = 0; i < n;)
  {
    auto x = rand_interval(extents[0], extents[3]);
    auto y = rand_interval(extents[1], extents[4]);
    auto z = rand_interval(extents[2], extents[5]);

    const auto pi = constants<S>::pi();
    auto a = rand_interval(0, 2 * pi);
    auto b = rand_interval(0, 2 * pi);
    auto c = rand_interval(0, 2 * pi);


    Matrix3<S> R;
    eulerToMatrix(a, b, c, R);
    Vector3<S> T(x, y, z);
    Transform3<S> tf(Transform3<S>::Identity());
    tf.linear() = R;
    tf.translation() = T;

    std::vector<std::pair<int, int> > results;
    {
      transforms[i] = tf;

      auto deltax = rand_interval(-delta_trans[0], delta_trans[0]);
      auto deltay = rand_interval(-delta_trans[1], delta_trans[1]);
      auto deltaz = rand_interval(-delta_trans[2], delta_trans[2]);

      auto deltaa = rand_interval(-delta_rot, delta_rot);
      auto deltab = rand_interval(-delta_rot, delta_rot);
      auto deltac = rand_interval(-delta_rot, delta_rot);

      Matrix3<S> R2;
      eulerToMatrix(a + deltaa, b + deltab, c + deltac, R2);
      Vector3<S> T2(x + deltax, y + deltay, z + deltaz);
      transforms2[i].linear() = R2;
      transforms2[i].translation() = T2;
      ++i;
    }
  }
}

//==============================================================================
template <typename S>
void generateEnvironments(std::vector<CollisionObject<S>*>& env, S env_scale, std::size_t n)
{
  S extents[] = {-env_scale, env_scale, -env_scale, env_scale, -env_scale, env_scale};
  aligned_vector<Transform3<S>> transforms;

  generateRandomTransforms(extents, transforms, n);
  for(std::size_t i = 0; i < n; ++i)
  {
    Box<S>* box = new Box<S>(5, 10, 20);
    env.push_back(new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(box), transforms[i]));
  }

  generateRandomTransforms(extents, transforms, n);
  for(std::size_t i = 0; i < n; ++i)
  {
    Sphere<S>* sphere = new Sphere<S>(30);
    env.push_back(new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(sphere), transforms[i]));
  }

  generateRandomTransforms(extents, transforms, n);
  for(std::size_t i = 0; i < n; ++i)
  {
    Cylinder<S>* cylinder = new Cylinder<S>(10, 40);
    env.push_back(new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(cylinder), transforms[i]));
  }
}

//==============================================================================
template <typename S>
void generateEnvironmentsMesh(std::vector<CollisionObject<S>*>& env, S env_scale, std::size_t n)
{
  S extents[] = {-env_scale, env_scale, -env_scale, env_scale, -env_scale, env_scale};
  aligned_vector<Transform3<S>> transforms;

  generateRandomTransforms(extents, transforms, n);
  Box<S> box(5, 10, 20);
  for(std::size_t i = 0; i < n; ++i)
  {
    BVHModel<OBBRSS<S>>* model = new BVHModel<OBBRSS<S>>();
    generateBVHModel(*model, box, Transform3<S>::Identity());
    env.push_back(new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(model), transforms[i]));
  }

  generateRandomTransforms(extents, transforms, n);
  Sphere<S> sphere(30);
  for(std::size_t i = 0; i < n; ++i)
  {
    BVHModel<OBBRSS<S>>* model = new BVHModel<OBBRSS<S>>();
    generateBVHModel(*model, sphere, Transform3<S>::Identity(), 16, 16);
    env.push_back(new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(model), transforms[i]));
  }

  generateRandomTransforms(extents, transforms, n);
  Cylinder<S> cylinder(10, 40);
  for(std::size_t i = 0; i < n; ++i)
  {
    BVHModel<OBBRSS<S>>* model = new BVHModel<OBBRSS<S>>();
    generateBVHModel(*model, cylinder, Transform3<S>::Identity(), 16, 16);
    env.push_back(new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(model), transforms[i]));
  }
}

#if FCL_HAVE_OCTOMAP

//==============================================================================
template <typename S>
void generateBoxesFromOctomap(std::vector<CollisionObject<S>*>& boxes, OcTree<S>& tree)
{
  std::vector<std::array<S, 6> > boxes_ = tree.toBoxes();

  for(std::size_t i = 0; i < boxes_.size(); ++i)
  {
    S x = boxes_[i][0];
    S y = boxes_[i][1];
    S z = boxes_[i][2];
    S size = boxes_[i][3];
    S cost = boxes_[i][4];
    S threshold = boxes_[i][5];

    Box<S>* box = new Box<S>(size, size, size);
    box->cost_density = cost;
    box->threshold_occupied = threshold;
    CollisionObject<S>* obj = new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(box), Transform3<S>(Translation3<S>(Vector3<S>(x, y, z))));
    boxes.push_back(obj);
  }

  std::cout << "boxes size: " << boxes.size() << std::endl;

}

//==============================================================================
template <typename S>
void generateBoxesFromOctomapMesh(std::vector<CollisionObject<S>*>& boxes, OcTree<S>& tree)
{
  std::vector<std::array<S, 6> > boxes_ = tree.toBoxes();

  for(std::size_t i = 0; i < boxes_.size(); ++i)
  {
    S x = boxes_[i][0];
    S y = boxes_[i][1];
    S z = boxes_[i][2];
    S size = boxes_[i][3];
    S cost = boxes_[i][4];
    S threshold = boxes_[i][5];

    Box<S> box(size, size, size);
    BVHModel<OBBRSS<S>>* model = new BVHModel<OBBRSS<S>>();
    generateBVHModel(*model, box, Transform3<S>::Identity());
    model->cost_density = cost;
    model->threshold_occupied = threshold;
    CollisionObject<S>* obj = new CollisionObject<S>(std::shared_ptr<CollisionGeometry<S>>(model), Transform3<S>(Translation3<S>(Vector3<S>(x, y, z))));
    boxes.push_back(obj);
  }

  std::cout << "boxes size: " << boxes.size() << std::endl;
}

//==============================================================================
inline octomap::OcTree* generateOcTree(double resolution)
{
  octomap::OcTree* tree = new octomap::OcTree(resolution);

  // insert some measurements of occupied cells
  for(int x = -20; x < 20; x++)
  {
    for(int y = -20; y < 20; y++)
    {
      for(int z = -20; z < 20; z++)
      {
        tree->updateNode(octomap::point3d(x * 0.05, y * 0.05, z * 0.05), true);
      }
    }
  }

  // insert some measurements of free cells
  for(int x = -30; x < 30; x++)
  {
    for(int y = -30; y < 30; y++)
    {
      for(int z = -30; z < 30; z++)
      {
        tree->updateNode(octomap::point3d(x*0.02 -1.0, y*0.02-1.0, z*0.02-1.0), false);
      }
    }
  }

  return tree;
}

#endif // FCL_HAVE_OCTOMAP

} // namespace test
} // namespace fcl

#endif