// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.

#include <opencv2/core.hpp>
#include <vector>
#include <cstdio>

#include "test_precomp.hpp"
#include "opencv2/ts.hpp"

namespace opencv_test { namespace {

struct OriginalObjGoldValues
{
    OriginalObjGoldValues()
    {
        std::array<float, 6> vals = { -5.93915f, -0.13257f, 2.55837f, 1.86743f, -1.16339f, 0.399941f };
        points =
        {
            { vals[0], vals[1], vals[2] },
            { vals[0], vals[3], vals[2] },
            { vals[0], vals[1], vals[4] },
            { vals[0], vals[3], vals[4] },
            { vals[5], vals[1], vals[2] },
            { vals[5], vals[3], vals[2] },
            { vals[5], vals[1], vals[4] },
            { vals[5], vals[3], vals[4] },
        };

        normals =
        {
            {-1.0f,  0.0f,  0.0f},
            { 0.0f,  0.0f, -1.0f},
            { 1.0f,  0.0f,  0.0f},
            { 0.0f,  0.0f,  1.0f},
            { 0.0f, -1.0f,  0.0f},
            { 0.0f,  1.0f,  0.0f}
        };

        rgb =
        {
            {0.0756f, 0.5651f, 0.5829f},
            {0.8596f, 0.1105f, 0.8455f},
            {0.8534f, 0.6143f, 0.3950f},
            {0.0438f, 0.6308f, 0.3065f},
            {0.9716f, 0.7170f, 0.8378f},
            {0.2472f, 0.7701f, 0.0234f},
            {0.6472f, 0.7467f, 0.5981f},
            {0.3502f, 0.7954f, 0.0443f}
        };

        std::vector<std::pair<int, int>> tcvals =
        {
            { 3, 0 },
            { 5, 0 },
            { 5, 2 },
            { 3, 2 },
            { 5, 4 },
            { 3, 4 },
            { 5, 6 },
            { 3, 6 },
            { 5, 8 },
            { 3, 8 },
            { 1, 4 },
            { 1, 6 },
            { 7, 4 },
            { 7, 6 },
        };

        for (const auto& p : tcvals)
        {
            texCoords.push_back({p.first * 0.125f, p.second * 0.125f});
        }

        // mesh data is duplicated for each face
        std::vector<std::array<int, 9>> fileIndices =
        {
            { 1,  1,  1, /**/ 2,  2,  1, /**/ 4,  3,  1 },
            { 3,  4,  2, /**/ 4,  3,  2, /**/ 8,  5,  2 },
            { 7,  6,  3, /**/ 8,  5,  3, /**/ 6,  7,  3 },
            { 5,  8,  4, /**/ 6,  7,  4, /**/ 2,  9,  4 },
            { 3, 11,  5, /**/ 7,  6,  5, /**/ 5,  8,  5 },
            { 8,  5,  6, /**/ 4, 13,  6, /**/ 2, 14,  6 },
        };

        for (const auto& fi : fileIndices)
        {
            pointsMesh.push_back(points.at(fi[0] - 1));
            pointsMesh.push_back(points.at(fi[3] - 1));
            pointsMesh.push_back(points.at(fi[6] - 1));
            rgbMesh.push_back(rgb.at(fi[0] - 1));
            rgbMesh.push_back(rgb.at(fi[3] - 1));
            rgbMesh.push_back(rgb.at(fi[6] - 1));

            texCoordsMesh.push_back(texCoords.at(fi[1] - 1));
            texCoordsMesh.push_back(texCoords.at(fi[4] - 1));
            texCoordsMesh.push_back(texCoords.at(fi[7] - 1));

            normalsMesh.push_back(normals.at(fi[2] - 1));
            normalsMesh.push_back(normals.at(fi[5] - 1));
            normalsMesh.push_back(normals.at(fi[8] - 1));
        }

        indices =
        {
            { 0,  1,  2},
            { 3,  4,  5},
            { 6,  7,  8},
            { 9, 10, 11},
            {12, 13, 14},
            {15, 16, 17},
        };
    }

    std::vector<Point3f> points, pointsMesh, normals, normalsMesh, rgb, rgbMesh;
    std::vector<Point2f> texCoords, texCoordsMesh;
    std::vector<std::vector<int32_t>> indices;
};

OriginalObjGoldValues origGold;

TEST(PointCloud, LoadPointCloudObj)
{
    std::vector<cv::Point3f> points, normals, rgb;

    auto folder = cvtest::TS::ptr()->get_data_path();
    cv::loadPointCloud(folder + "pointcloudio/orig.obj", points, normals, rgb);

    EXPECT_EQ(origGold.points, points);
    EXPECT_EQ(origGold.rgb, rgb);
    EXPECT_EQ(origGold.normals, normals);
}

TEST(PointCloud, LoadObjNoNormals)
{
    std::vector<cv::Point3f> points, normals;

    auto folder = cvtest::TS::ptr()->get_data_path();
    cv::loadPointCloud(folder + "pointcloudio/orig_no_norms.obj", points, normals);

    EXPECT_EQ(origGold.points, points);
    EXPECT_TRUE(normals.empty());
}

TEST(PointCloud, SaveObj)
{
    std::vector<cv::Point3f> points_gold, normals_gold, rgb_gold;

    auto folder = cvtest::TS::ptr()->get_data_path();
    auto new_path = tempfile("new.obj");

    cv::loadPointCloud(folder + "pointcloudio/orig.obj", points_gold, normals_gold, rgb_gold);
    cv::savePointCloud(new_path, points_gold, normals_gold, rgb_gold);

    std::vector<cv::Point3f> points, normals, rgb;

    cv::loadPointCloud(new_path, points, normals, rgb);

    EXPECT_EQ(normals, normals_gold);
    EXPECT_EQ(points, points_gold);
    EXPECT_EQ(rgb, rgb_gold);
    std::remove(new_path.c_str());
}

TEST(PointCloud, LoadSavePly)
{
    std::vector<cv::Point3f> points, normals, rgb;

    auto folder = cvtest::TS::ptr()->get_data_path();
    std::string new_path = tempfile("new.ply");

    cv::loadPointCloud(folder + "pointcloudio/orig.ply", points, normals, rgb);
    cv::savePointCloud(new_path, points, normals, rgb);

    std::vector<cv::Point3f> points_gold, normals_gold, rgb_gold;

    cv::loadPointCloud(new_path, points_gold, normals_gold, rgb_gold);

    EXPECT_EQ(normals_gold, normals);
    EXPECT_EQ(points_gold, points);
    EXPECT_EQ(rgb_gold, rgb);
    std::remove(new_path.c_str());
}

TEST(PointCloud, LoadSaveMeshObj)
{
    std::vector<cv::Point3f> points, normals, colors;
    std::vector<cv::Point2f> texCoords;
    std::vector<std::vector<int32_t>> indices;

    auto folder = cvtest::TS::ptr()->get_data_path();
    std::string new_path = tempfile("new_mesh.obj");

    cv::loadMesh(folder + "pointcloudio/orig.obj", points, indices, normals, colors, texCoords);
    EXPECT_EQ(origGold.pointsMesh, points);
    EXPECT_EQ(origGold.indices, indices);
    EXPECT_EQ(origGold.normalsMesh, normals);
    EXPECT_EQ(origGold.rgbMesh, colors);
    EXPECT_EQ(origGold.texCoordsMesh, texCoords);
    cv::saveMesh(new_path, points, indices, normals, colors, texCoords);

    std::vector<cv::Point3f> points_gold, normals_gold, colors_gold;
    std::vector<cv::Point2f> texCoords_gold;
    std::vector<std::vector<int32_t>> indices_gold;

    cv::loadMesh(new_path, points_gold, indices_gold, normals_gold, colors_gold, texCoords_gold);
    EXPECT_FALSE(points_gold.empty());
    EXPECT_FALSE(indices_gold.empty());
    EXPECT_FALSE(normals_gold.empty());
    EXPECT_FALSE(colors_gold.empty());
    EXPECT_FALSE(texCoords_gold.empty());

    EXPECT_EQ(normals_gold, normals);
    EXPECT_EQ(points_gold, points);
    EXPECT_EQ(indices_gold, indices);
    EXPECT_TRUE(!indices.empty());
    std::remove(new_path.c_str());
}

typedef std::string PlyTestParamsType;
typedef testing::TestWithParam<PlyTestParamsType> PlyTest;

TEST_P(PlyTest, LoadSaveMesh)
{
    std::string fname = GetParam();

    std::vector<cv::Point3f> points_gold, normals_gold, colors_gold;
    std::vector<cv::Vec3i> indices_gold;

    auto folder = cvtest::TS::ptr()->get_data_path();
    std::string new_path = tempfile("new_mesh.ply");

    cv::loadMesh(folder + fname, points_gold, indices_gold, normals_gold, colors_gold);
    size_t truePts, trueFaces;
    if (fname.find("/dragon.ply") != fname.npos)
    {
        truePts = 50000; trueFaces = 100000;
    }
    else
    {
        truePts = 8; trueFaces = 12;
    }
    EXPECT_EQ(points_gold.size(), truePts);
    EXPECT_EQ(indices_gold.size(), trueFaces);

    cv::saveMesh(new_path, points_gold, indices_gold, normals_gold, colors_gold);

    std::vector<cv::Point3f> points, normals, colors;
    std::vector<cv::Vec3i> indices;
    cv::loadMesh(new_path, points, indices, normals, colors);

    if (!normals.empty())
    {
        EXPECT_LE(cv::norm(normals_gold, normals, NORM_INF), 0);
    }
    EXPECT_LE(cv::norm(points_gold, points, NORM_INF), 0);
    EXPECT_LE(cv::norm(colors_gold, colors, NORM_INF), 0);
    EXPECT_EQ(indices_gold, indices);
    std::remove(new_path.c_str());
}


INSTANTIATE_TEST_CASE_P(PointCloud, PlyTest,
    ::testing::Values("pointcloudio/orig.ply", "pointcloudio/orig_ascii_fidx.ply", "pointcloudio/orig_bin_fidx.ply",
                      "pointcloudio/orig_ascii_vidx.ply", "pointcloudio/orig_bin.ply", "viz/dragon.ply"));

TEST(PointCloud, NonexistentFile)
{
    std::vector<cv::Point3f> points;
    std::vector<cv::Point3f> normals;

    auto folder = cvtest::TS::ptr()->get_data_path();
    cv::loadPointCloud(folder + "pointcloudio/fake.obj", points, normals);
    EXPECT_TRUE(points.empty());
    EXPECT_TRUE(normals.empty());
}

TEST(PointCloud, LoadBadExtension)
{
    std::vector<cv::Point3f> points;
    std::vector<cv::Point3f> normals;

    auto folder = cvtest::TS::ptr()->get_data_path();
    cv::loadPointCloud(folder + "pointcloudio/fake.fake", points, normals);
    EXPECT_TRUE(points.empty());
    EXPECT_TRUE(normals.empty());
}

TEST(PointCloud, SaveBadExtension)
{
    std::vector<cv::Point3f> points;
    std::vector<cv::Point3f> normals;

    auto folder = cvtest::TS::ptr()->get_data_path();
    cv::savePointCloud(folder + "pointcloudio/fake.fake", points, normals);
}

}} /* namespace opencv_test */