/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2024, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include <mrpt/config/CConfigFile.h>
#include <mrpt/io/CFileGZInputStream.h>
#include <mrpt/maps/CMultiMetricMap.h>
#include <mrpt/maps/COccupancyGridMap2D.h>
#include <mrpt/maps/CSimpleMap.h>
#include <mrpt/ros2bridge/map.h>
#include <mrpt/ros2bridge/pose.h>
#include <mrpt/serialization/CArchive.h>
#include <mrpt/system/filesystem.h>    // for fileExists()
#include <mrpt/system/string_utils.h>  // for lowerCase()
#include <mrpt/version.h>

#include <nav_msgs/msg/occupancy_grid.hpp>

using namespace mrpt::config;
using namespace mrpt::io;
using mrpt::maps::CLogOddsGridMapLUT;
using mrpt::maps::CMultiMetricMap;
using mrpt::maps::COccupancyGridMap2D;
using mrpt::maps::CSimpleMap;

#ifndef INT8_MAX  // avoid duplicated #define's
#define INT8_MAX  0x7f
#define INT8_MIN  (-INT8_MAX - 1)
#define INT16_MAX 0x7fff
#define INT16_MIN (-INT16_MAX - 1)
#endif  // INT8_MAX

using namespace mrpt::ros2bridge;

MapHdl::MapHdl()
{
  // MRPT -> ROS LUT:
  CLogOddsGridMapLUT<COccupancyGridMap2D::cellType> table;

#ifdef OCCUPANCY_GRIDMAP_CELL_SIZE_8BITS
  const int i_min = INT8_MIN, i_max = INT8_MAX;
#else
  const int i_min = INT16_MIN, i_max = INT16_MAX;
#endif

  for (int i = i_min; i <= i_max; i++)
  {
    int8_t ros_val;
    if (i == 0)
    {
      // Unknown cell (no evidence data):
      ros_val = -1;
    }
    else
    {
      float p = 1.0 - table.l2p(i);
      ros_val = round(p * 100.);
      // printf("- cell -> ros = %4i -> %4i, p=%4.3f\n", i, ros_val, p);
    }

    lut_cellmrpt2ros[static_cast<int>(i) - i_min] = ros_val;
  }

  // ROS -> MRPT: [0,100] ->
  for (int i = 0; i <= 100; i++)
  {
    const float p = 1.0 - (i / 100.0);
    lut_cellros2mrpt[i] = table.p2l(p);

    // printf("- ros->cell=%4i->%4i p=%4.3f\n",i, lut_cellros2mrpt[i], p);
  }
}
MapHdl* MapHdl::instance()
{
  static MapHdl m;  // singeleton instance
  return &m;
}

bool mrpt::ros2bridge::fromROS(const nav_msgs::msg::OccupancyGrid& src, COccupancyGridMap2D& des)
{
  MRPT_START
  if ((src.info.origin.orientation.x != 0) || (src.info.origin.orientation.y != 0) ||
      (src.info.origin.orientation.z != 0) || (src.info.origin.orientation.w != 1))
  {
    std::cerr << "[fromROS] Rotated maps are not supported!\n";
    return false;
  }
  float xmin = src.info.origin.position.x;
  float ymin = src.info.origin.position.y;
  float xmax = xmin + src.info.width * src.info.resolution;
  float ymax = ymin + src.info.height * src.info.resolution;

  des.setSize(xmin, xmax, ymin, ymax, src.info.resolution);
  auto inst = MapHdl::instance();
  for (unsigned int h = 0; h < src.info.height; h++)
  {
    COccupancyGridMap2D::cellType* pDes = des.getRow(h);
    const int8_t* pSrc = &src.data[h * src.info.width];
    for (unsigned int w = 0; w < src.info.width; w++) *pDes++ = inst->cellRos2Mrpt(*pSrc++);
  }
  return true;
  MRPT_END
}
bool mrpt::ros2bridge::toROS(
    const COccupancyGridMap2D& src,
    nav_msgs::msg::OccupancyGrid& des,
    const std_msgs::msg::Header& header)
{
  des.header = header;
  return toROS(src, des);
}

bool mrpt::ros2bridge::toROS(const COccupancyGridMap2D& src, nav_msgs::msg::OccupancyGrid& des)
{
  des.info.width = src.getSizeX();
  des.info.height = src.getSizeY();
  des.info.resolution = src.getResolution();

  des.info.origin.position.x = src.getXMin();
  des.info.origin.position.y = src.getYMin();
  des.info.origin.position.z = 0;

  des.info.origin.orientation.x = 0;
  des.info.origin.orientation.y = 0;
  des.info.origin.orientation.z = 0;
  des.info.origin.orientation.w = 1;

  // I hope the data is always aligned
  des.data.resize(des.info.width * des.info.height);
  for (unsigned int h = 0; h < des.info.height; h++)
  {
    const COccupancyGridMap2D::cellType* pSrc = src.getRow(h);
    int8_t* pDes = &des.data[h * des.info.width];
    for (unsigned int w = 0; w < des.info.width; w++)
    {
      *pDes++ = MapHdl::instance()->cellMrpt2Ros(*pSrc++);
    }
  }
  return true;
}

bool MapHdl::loadMap(
    CMultiMetricMap& _metric_map,
    const CConfigFileBase& _config_file,
    const std::string& _map_file,
    const std::string& _section_name,
    bool _debug)
{
  using namespace mrpt::maps;

  TSetOfMetricMapInitializers mapInitializers;
  mapInitializers.loadFromConfigFile(_config_file, _section_name);

  CSimpleMap simpleMap;

  // Load the set of metric maps to consider in the experiments:
  _metric_map.setListOfMaps(mapInitializers);
  if (_debug) mapInitializers.dumpToConsole();

  if (_debug) printf("%s, _map_file.size() = %zu\n", _map_file.c_str(), _map_file.size());
  // Load the map (if any):
  if (_map_file.size() < 3)
  {
    if (_debug) printf("No mrpt map file!\n");
    return false;
  }
  else
  {
    ASSERT_(mrpt::system::fileExists(_map_file));

    // Detect file extension:
    std::string mapExt = mrpt::system::lowerCase(
        mrpt::system::extractFileExtension(_map_file, true));  // Ignore possible .gz extensions

    if (!mapExt.compare("simplemap"))
    {
      // It's a ".simplemap":
      if (_debug) printf("Loading '.simplemap' file...");
      CFileGZInputStream f(_map_file);
      mrpt::serialization::archiveFrom(f) >> simpleMap;

      ASSERTMSG_(simpleMap.size() > 0, "Simplemap was aparently loaded OK, but it is empty!");

      // Build metric map:
      if (_debug) printf("Building metric map(s) from '.simplemap'...");
      _metric_map.loadFromSimpleMap(simpleMap);
      if (_debug) printf("Ok\n");
    }
    else if (!mapExt.compare("gridmap"))
    {
      // It's a ".gridmap":
      if (_debug) printf("Loading gridmap from '.gridmap'...");
      ASSERTMSG_(
          _metric_map.countMapsByClass<COccupancyGridMap2D>() == 1,
          "Error: Trying to load a gridmap into a multi-metric map "
          "requires 1 gridmap member.");
      CFileGZInputStream fm(_map_file);
      mrpt::serialization::archiveFrom(fm) >> (*_metric_map.mapByClass<COccupancyGridMap2D>());
      if (_debug) printf("Ok\n");
    }
    else
    {
      THROW_EXCEPTION(mrpt::format("Map file has unknown extension: '%s'", mapExt.c_str()));
      return false;
    }
  }
  return true;
}
