// Copyright (c) 2022, ETH Zurich and UNC Chapel Hill.
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// Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)

#define TEST_NAME "mvs/depth_map_test"
#include "util/testing.h"

#include "mvs/depth_map.h"

using namespace colmap;
using namespace colmap::mvs;

BOOST_AUTO_TEST_CASE(TestEmpty) {
  DepthMap depth_map;
  BOOST_CHECK_EQUAL(depth_map.GetWidth(), 0);
  BOOST_CHECK_EQUAL(depth_map.GetHeight(), 0);
  BOOST_CHECK_EQUAL(depth_map.GetDepth(), 1);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMin(), -1);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMax(), -1);
}

BOOST_AUTO_TEST_CASE(TestNonEmpty) {
  DepthMap depth_map(1, 2, 0, 1);
  BOOST_CHECK_EQUAL(depth_map.GetWidth(), 1);
  BOOST_CHECK_EQUAL(depth_map.GetHeight(), 2);
  BOOST_CHECK_EQUAL(depth_map.GetDepth(), 1);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMin(), 0);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMax(), 1);
}

BOOST_AUTO_TEST_CASE(TestRescale) {
  DepthMap depth_map(6, 7, 0, 1);
  depth_map.Rescale(0.5);
  BOOST_CHECK_EQUAL(depth_map.GetWidth(), 3);
  BOOST_CHECK_EQUAL(depth_map.GetHeight(), 4);
  BOOST_CHECK_EQUAL(depth_map.GetDepth(), 1);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMin(), 0);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMax(), 1);
}

BOOST_AUTO_TEST_CASE(TestDownsize) {
  DepthMap depth_map(6, 7, 0, 1);
  depth_map.Downsize(2, 4);
  BOOST_CHECK_EQUAL(depth_map.GetWidth(), 2);
  BOOST_CHECK_EQUAL(depth_map.GetHeight(), 2);
  BOOST_CHECK_EQUAL(depth_map.GetDepth(), 1);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMin(), 0);
  BOOST_CHECK_EQUAL(depth_map.GetDepthMax(), 1);
}

BOOST_AUTO_TEST_CASE(TestToBitmap) {
  DepthMap depth_map(2, 2, 0.1, 0.9);
  depth_map.Fill(0.9);
  depth_map.Set(0, 0, 0, 0.1);
  depth_map.Set(0, 1, 0, 0.5);
  const Bitmap bitmap = depth_map.ToBitmap(0, 100);
  BOOST_CHECK_EQUAL(bitmap.Width(), depth_map.GetWidth());
  BOOST_CHECK_EQUAL(bitmap.Height(), depth_map.GetHeight());
  BOOST_CHECK_EQUAL(bitmap.IsRGB(), true);
  BitmapColor<uint8_t> color;
  BOOST_CHECK(bitmap.GetPixel(0, 0, &color));
  BOOST_CHECK_EQUAL(color, BitmapColor<uint8_t>(0, 0, 128));
  BOOST_CHECK(bitmap.GetPixel(0, 1, &color));
  BOOST_CHECK_EQUAL(color, BitmapColor<uint8_t>(128, 0, 0));
  BOOST_CHECK(bitmap.GetPixel(1, 0, &color));
  BOOST_CHECK_EQUAL(color, BitmapColor<uint8_t>(128, 255, 127));
  BOOST_CHECK(bitmap.GetPixel(1, 1, &color));
  BOOST_CHECK_EQUAL(color, BitmapColor<uint8_t>(128, 0, 0));
}