/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2026, 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 <gtest/gtest.h>
#include <mrpt/topography.h>

using namespace mrpt;
using namespace mrpt::math;
using namespace mrpt::topography;
using namespace std;

void do_test_geodetic_geocentric(const TGeodeticCoords c1)
{
  TGeocentricCoords geo1;
  mrpt::topography::geodeticToGeocentric(c1, geo1, TEllipsoid::Ellipsoid_WGS84());

  TGeodeticCoords c2;
  mrpt::topography::geocentricToGeodetic(geo1, c2, TEllipsoid::Ellipsoid_WGS84());

  EXPECT_NEAR(c1.lat, c2.lat, 1e-8);
  EXPECT_NEAR(c1.lon, c2.lon, 1e-8);
  EXPECT_NEAR(c1.height, c2.height, 1e-4);
}

TEST(TopographyConversion, GeodeticToGeocentricToGeodetic)
{
  do_test_geodetic_geocentric(TGeodeticCoords(TCoords(36, 1, 30), TCoords(3, 2, 40), 20));
  do_test_geodetic_geocentric(TGeodeticCoords(TCoords(-36, 1, 30), TCoords(3, 2, 40), 20));
  do_test_geodetic_geocentric(TGeodeticCoords(TCoords(36, 1, 30), TCoords(-3, 2, 40), 20));
  do_test_geodetic_geocentric(TGeodeticCoords(TCoords(-36, 1, 30), TCoords(-3, 2, 40), 20));
}

TEST(TopographyConversion, geodeticToENU_WGS84)
{
  // A test of GPS WGS84 -> ENU Cartessian coordinates with known solution
  mrpt::topography::TGeodeticCoords gps_point;
  gps_point.lon = -4.475828390;
  gps_point.lat = 36.716411055;
  gps_point.height = 48.243;

  mrpt::topography::TGeodeticCoords gps_ref;
  gps_ref.lon = -4.4789588283333330;
  gps_ref.lat = 36.714459075;
  gps_ref.height = 38.8887;

  TPoint3D P;
  mrpt::topography::geodeticToENU_WGS84(gps_point, P, gps_ref);

  TPoint3D P_true(279.679067794, 216.621954, 9.34448);
  EXPECT_NEAR(P.x, P_true.x, 3e-3);  // Precision should be *much* better than
  // 1mm, but don't be so hard...
  EXPECT_NEAR(P.y, P_true.y, 3e-3);
  EXPECT_NEAR(P.z, P_true.z, 3e-3);

  // 2nd test: just modify the height and verify that ENU coordinates only
  // change in Z:
  mrpt::topography::TGeodeticCoords gps_point2 = gps_ref;
  const double A_height = 15.0;
  gps_point2.height += A_height;

  mrpt::topography::geodeticToENU_WGS84(gps_point2, P, gps_ref);

  EXPECT_NEAR(P.x, 0, 0.1e-3);  // Precision: 0.1mm
  EXPECT_NEAR(P.y, 0, 0.1e-3);
  EXPECT_NEAR(P.z, A_height, 0.1e-3);
}

TEST(TopographyConversion, geodeticToUTM_WGS84)
{
  mrpt::topography::TGeodeticCoords gps_point;
  gps_point.lon = -2.404508;
  gps_point.lat = 36.829293;
  gps_point.height = 0;

  mrpt::topography::TUTMCoords utm;
  int utm_zone = 0;
  char lat_band = 0;

  mrpt::topography::geodeticToUTM(gps_point, utm, utm_zone, lat_band);

  EXPECT_EQ(utm_zone, 30);
  EXPECT_EQ(lat_band, 'S');
  EXPECT_NEAR(utm.x, 553103.02, 0.05);
  EXPECT_NEAR(utm.y, 4076100.98, 0.05);
}

TEST(TopographyConversion, UTMToGeodetic_WGS84)
{
  const mrpt::topography::TUTMCoords utm = {553103.020, 4076100.969, 0.0};

  mrpt::topography::TGeodeticCoords gc;
  mrpt::topography::UTMToGeodetic(utm, 30, 'N', gc);

  EXPECT_NEAR(gc.lat, 36.829293, 1e-6);
  EXPECT_NEAR(gc.lon, -2.404508, 1e-6);
}
