/*
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Open Asset Import Library (assimp)
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*/

#include "UnitTestPCH.h"
#include "SceneDiffer.h"
#include "AbstractImportExportBase.h"
#include <assimp/scene.h>
#include <assimp/Importer.hpp>
#include <assimp/Exporter.hpp>
#include <assimp/postprocess.h>

using namespace Assimp;

static const float VertComponents[ 24 * 3 ] = {
    -0.500000,  0.500000,  0.500000,
    -0.500000,  0.500000, -0.500000,
    -0.500000, -0.500000, -0.500000,
    -0.500000, -0.500000,  0.500000,
    -0.500000, -0.500000, -0.500000,
     0.500000, -0.500000, -0.500000,
     0.500000, -0.500000,  0.500000,
    -0.500000, -0.500000,  0.500000,
    -0.500000,  0.500000, -0.500000,
     0.500000,  0.500000, -0.500000,
     0.500000, -0.500000, -0.500000,
    -0.500000, -0.500000, -0.500000,
     0.500000,  0.500000,  0.500000,
     0.500000,  0.500000, -0.500000,
    -0.500000,  0.500000, -0.500000,
    -0.500000,  0.500000,  0.500000,
     0.500000, -0.500000,  0.500000,
     0.500000,  0.500000,  0.500000,
    -0.500000,  0.500000,  0.500000,
    -0.500000, -0.500000,  0.500000,
     0.500000, -0.500000, -0.500000,
     0.500000,  0.500000, -0.500000,
     0.500000,  0.500000,  0.500000f,
     0.500000, -0.500000,  0.500000f
};

static const char *ObjModel =
    "o 1\n"
    "\n"
    "# Vertex list\n"
    "\n"
    "v -0.5 -0.5  0.5\n"
    "v -0.5 -0.5 -0.5\n"
    "v -0.5  0.5 -0.5\n"
    "v -0.5  0.5  0.5\n"
    "v  0.5 -0.5  0.5\n"
    "v  0.5 -0.5 -0.5\n"
    "v  0.5  0.5 -0.5\n"
    "v  0.5  0.5  0.5\n"
    "\n"
    "# Point / Line / Face list\n"
    "\n"
    "g Box01\n"    
    "usemtl Default\n"
    "f 4 3 2 1\n"
    "f 2 6 5 1\n"
    "f 3 7 6 2\n"
    "f 8 7 3 4\n"
    "f 5 8 4 1\n"
    "f 6 7 8 5\n"
    "\n"
    "# End of file\n";

static const char *ObjModel_Issue1111 =
    "o 1\n"
    "\n"
    "# Vertex list\n"
    "\n"
    "v -0.5 -0.5  0.5\n"
    "v -0.5 -0.5 -0.5\n"
    "v -0.5  0.5 -0.5\n"
    "\n"
    "usemtl\n"
    "f 1 2 3\n"
    "\n"
    "# End of file\n";

class utObjImportExport : public AbstractImportExportBase {
protected:
    virtual void SetUp() {
        m_im = new Assimp::Importer;
    }

    virtual void TearDown() {
        delete m_im;
        m_im = nullptr;
    }

    aiScene *createScene() {
        aiScene *expScene = new aiScene;
        expScene->mNumMeshes = 1;
        expScene->mMeshes = new aiMesh*[ 1 ];
        aiMesh *mesh = new aiMesh;
        mesh->mName.Set( "1" );
        mesh->mNumVertices = 24;
        mesh->mVertices = new aiVector3D[ 24 ];
        ::memcpy( &mesh->mVertices->x, &VertComponents[ 0 ], sizeof( float ) * 24 * 3 );
        mesh->mNumFaces = 6;
        mesh->mFaces = new aiFace[ mesh->mNumFaces ];

        mesh->mFaces[ 0 ].mNumIndices = 4;
        mesh->mFaces[ 0 ].mIndices = new unsigned int[ mesh->mFaces[ 0 ].mNumIndices ];
        mesh->mFaces[ 0 ].mIndices[ 0 ] = 0;
        mesh->mFaces[ 0 ].mIndices[ 1 ] = 1;
        mesh->mFaces[ 0 ].mIndices[ 2 ] = 2;
        mesh->mFaces[ 0 ].mIndices[ 3 ] = 3;

        mesh->mFaces[ 1 ].mNumIndices = 4;
        mesh->mFaces[ 1 ].mIndices = new unsigned int[ mesh->mFaces[ 0 ].mNumIndices ];
        mesh->mFaces[ 1 ].mIndices[ 0 ] = 4;
        mesh->mFaces[ 1 ].mIndices[ 1 ] = 5;
        mesh->mFaces[ 1 ].mIndices[ 2 ] = 6;
        mesh->mFaces[ 1 ].mIndices[ 3 ] = 7;

        mesh->mFaces[ 2 ].mNumIndices = 4;
        mesh->mFaces[ 2 ].mIndices = new unsigned int[ mesh->mFaces[ 0 ].mNumIndices ];
        mesh->mFaces[ 2 ].mIndices[ 0 ] = 8;
        mesh->mFaces[ 2 ].mIndices[ 1 ] = 9;
        mesh->mFaces[ 2 ].mIndices[ 2 ] = 10;
        mesh->mFaces[ 2 ].mIndices[ 3 ] = 11;

        mesh->mFaces[ 3 ].mNumIndices = 4;
        mesh->mFaces[ 3 ].mIndices = new unsigned int[ mesh->mFaces[ 0 ].mNumIndices ];
        mesh->mFaces[ 3 ].mIndices[ 0 ] = 12;
        mesh->mFaces[ 3 ].mIndices[ 1 ] = 13;
        mesh->mFaces[ 3 ].mIndices[ 2 ] = 14;
        mesh->mFaces[ 3 ].mIndices[ 3 ] = 15;

        mesh->mFaces[ 4 ].mNumIndices = 4;
        mesh->mFaces[ 4 ].mIndices = new unsigned int[ mesh->mFaces[ 0 ].mNumIndices ];
        mesh->mFaces[ 4 ].mIndices[ 0 ] = 16;
        mesh->mFaces[ 4 ].mIndices[ 1 ] = 17;
        mesh->mFaces[ 4 ].mIndices[ 2 ] = 18;
        mesh->mFaces[ 4 ].mIndices[ 3 ] = 19;

        mesh->mFaces[ 5 ].mNumIndices = 4;
        mesh->mFaces[ 5 ].mIndices = new unsigned int[ mesh->mFaces[ 0 ].mNumIndices ];
        mesh->mFaces[ 5 ].mIndices[ 0 ] = 20;
        mesh->mFaces[ 5 ].mIndices[ 1 ] = 21;
        mesh->mFaces[ 5 ].mIndices[ 2 ] = 22;
        mesh->mFaces[ 5 ].mIndices[ 3 ] = 23;

        expScene->mMeshes[ 0 ] = mesh;

        expScene->mNumMaterials = 1;
        expScene->mMaterials = new aiMaterial*[ expScene->mNumMaterials ];

        return expScene;
    }

    virtual bool importerTest() {
        ::Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/OBJ/spider.obj", aiProcess_ValidateDataStructure );
        return nullptr != scene;
    }

#ifndef ASSIMP_BUILD_NO_EXPORT

    virtual bool exporterTest() {
        ::Assimp::Importer importer;
        ::Assimp::Exporter exporter;
        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/OBJ/spider.obj", aiProcess_ValidateDataStructure );
        EXPECT_NE( nullptr, scene );
        EXPECT_EQ( aiReturn_SUCCESS, exporter.Export( scene, "obj", ASSIMP_TEST_MODELS_DIR "/OBJ/spider_out.obj" ) );
        EXPECT_EQ( aiReturn_SUCCESS, exporter.Export( scene, "objnomtl", ASSIMP_TEST_MODELS_DIR "/OBJ/spider_nomtl_out.obj" ) );
        
        return true;
    }

#endif // ASSIMP_BUILD_NO_EXPORT

protected:
    ::Assimp::Importer *m_im;
    aiScene *m_expectedScene;
};

TEST_F( utObjImportExport, importObjFromFileTest ) {
    EXPECT_TRUE( importerTest() );
}

#ifndef ASSIMP_BUILD_NO_EXPORT

TEST_F( utObjImportExport, exportObjFromFileTest ) {
    EXPECT_TRUE( exporterTest() );
}

#endif // ASSIMP_BUILD_NO_EXPORT

TEST_F( utObjImportExport, obj_import_test ) {
    const aiScene *scene = m_im->ReadFileFromMemory( (void*) ObjModel, strlen(ObjModel), 0 );
    aiScene *expected = createScene();
    EXPECT_NE( nullptr, scene );

    SceneDiffer differ;
    EXPECT_TRUE( differ.isEqual( expected, scene ) );
    differ.showReport();

    m_im->FreeScene();
    for(unsigned int i = 0; i < expected->mNumMeshes; ++i)
    {
        delete expected->mMeshes[i];
    }
    delete[] expected->mMeshes;
    expected->mMeshes = nullptr;
    delete[] expected->mMaterials;
    expected->mMaterials = nullptr;
    delete expected;
}

TEST_F( utObjImportExport, issue1111_no_mat_name_Test ) {
    const aiScene *scene = m_im->ReadFileFromMemory( ( void* ) ObjModel_Issue1111, strlen(ObjModel_Issue1111), 0 );
    EXPECT_NE( nullptr, scene );
}

TEST_F( utObjImportExport, issue809_vertex_color_Test ) {
    ::Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/OBJ/cube_with_vertexcolors.obj", aiProcess_ValidateDataStructure );
    EXPECT_NE( nullptr, scene );

#ifndef ASSIMP_BUILD_NO_EXPORT
    ::Assimp::Exporter exporter;
    EXPECT_EQ( aiReturn_SUCCESS, exporter.Export( scene, "obj", ASSIMP_TEST_MODELS_DIR "/OBJ/test_out.obj" ) );
#endif // ASSIMP_BUILD_NO_EXPORT
}

TEST_F( utObjImportExport, issue1923_vertex_color_Test ) {
    ::Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/OBJ/cube_with_vertexcolors_uni.obj", aiProcess_ValidateDataStructure );
    EXPECT_NE( nullptr, scene );

    scene = importer.GetOrphanedScene();

#ifndef ASSIMP_BUILD_NO_EXPORT
    ::Assimp::Exporter exporter;
    const aiExportDataBlob* blob = exporter.ExportToBlob( scene, "obj");
    EXPECT_NE( nullptr, blob );

    const aiScene *sceneReImport = importer.ReadFileFromMemory( blob->data, blob->size, aiProcess_ValidateDataStructure );
    EXPECT_NE( nullptr, scene );

    SceneDiffer differ;
    EXPECT_TRUE( differ.isEqual( scene, sceneReImport ) );
#endif // ASSIMP_BUILD_NO_EXPORT

    delete scene;
}

TEST_F( utObjImportExport, issue1453_segfault ) {
    static const char *ObjModel =
        "v  0.0  0.0  0.0\n"
        "v  0.0  0.0  1.0\n"
        "v  0.0  1.0  0.0\n"
        "v  0.0  1.0  1.0\n"
        "v  1.0  0.0  0.0\n"
        "v  1.0  0.0  1.0\n"
        "v  1.0  1.0  0.0\n"
        "v  1.0  1.0  1.0\nB";

    Assimp::Importer myimporter;
    const aiScene *scene = myimporter.ReadFileFromMemory( ObjModel, strlen(ObjModel), aiProcess_ValidateDataStructure );
    EXPECT_EQ( nullptr, scene );
}

TEST_F(utObjImportExport, relative_indices_Test) {
    static const char *ObjModel =
        "v -0.500000 0.000000 0.400000\n"
        "v -0.500000 0.000000 -0.800000\n"
        "v -0.500000 1.000000 -0.800000\n"
        "v -0.500000 1.000000 0.400000\n"
        "f -4 -3 -2 -1\nB";

    Assimp::Importer myimporter;
    const aiScene *scene = myimporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);

    EXPECT_EQ(scene->mNumMeshes, 1U);
    const aiMesh *mesh = scene->mMeshes[0];
    EXPECT_EQ(mesh->mNumVertices, 4U);
    EXPECT_EQ(mesh->mNumFaces, 1U);
    const aiFace face = mesh->mFaces[0];
    EXPECT_EQ(face.mNumIndices, 4U);
    for (unsigned int i = 0; i < face.mNumIndices; ++i)
    {
        EXPECT_EQ(face.mIndices[i], i);
    }

}

TEST_F(utObjImportExport, homogeneous_coordinates_Test) {
    static const char *ObjModel =
        "v -0.500000 0.000000 0.400000 0.50000\n"
        "v -0.500000 0.000000 -0.800000 1.00000\n"
        "v 0.500000 1.000000 -0.800000 0.5000\n"
        "f 1 2 3\nB";

    Assimp::Importer myimporter;
    const aiScene *scene = myimporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);

    EXPECT_EQ(scene->mNumMeshes, 1U);
    const aiMesh *mesh = scene->mMeshes[0];
    EXPECT_EQ(mesh->mNumVertices, 3U);
    EXPECT_EQ(mesh->mNumFaces, 1U);
    const aiFace face = mesh->mFaces[0];
    EXPECT_EQ(face.mNumIndices, 3U);
    const aiVector3D vertice = mesh->mVertices[0];
    EXPECT_EQ(vertice.x, -1.0f);
    EXPECT_EQ(vertice.y, 0.0f);
    EXPECT_EQ(vertice.z, 0.8f);
}

TEST_F(utObjImportExport, homogeneous_coordinates_divide_by_zero_Test) {
  static const char *ObjModel =
    "v -0.500000 0.000000 0.400000 0.\n"
    "v -0.500000 0.000000 -0.800000 1.00000\n"
    "v 0.500000 1.000000 -0.800000 0.5000\n"
    "f 1 2 3\nB";

  Assimp::Importer myimporter;
  const aiScene *scene = myimporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), aiProcess_ValidateDataStructure);
  EXPECT_EQ(nullptr, scene);
}

TEST_F(utObjImportExport, 0based_array_Test) {
    static const char *ObjModel =
        "v -0.500000 0.000000 0.400000\n"
        "v -0.500000 0.000000 -0.800000\n"
        "v -0.500000 1.000000 -0.800000\n"
        "f 0 1 2\nB";

    Assimp::Importer myImporter;
    const aiScene *scene = myImporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), 0);
    EXPECT_EQ(nullptr, scene);
}

TEST_F(utObjImportExport, invalid_normals_uvs) {
    static const char *ObjModel =
        "v -0.500000 0.000000 0.400000\n"
        "v -0.500000 0.000000 -0.800000\n"
        "v -0.500000 1.000000 -0.800000\n"
		"vt 0 0\n"
		"vn 0 1 0\n"
        "f 1/1/1 1/1/1 2/2/2\nB";

    Assimp::Importer myImporter;
    const aiScene *scene = myImporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), 0);
    EXPECT_NE(nullptr, scene);
}

TEST_F(utObjImportExport, no_vt_just_vns) {
    static const char *ObjModel =
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 0 0 0\n"
		"v 10 0 0\n"
		"v 0 10 0\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"vn 0 0 1\n"
		"f 10/10 11/11 12/12\n";

    Assimp::Importer myImporter;
    const aiScene *scene = myImporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), 0);
    EXPECT_NE(nullptr, scene);
}

TEST_F( utObjImportExport, mtllib_after_g ) {
    ::Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/OBJ/cube_mtllib_after_g.obj", aiProcess_ValidateDataStructure );
    ASSERT_NE( nullptr, scene );

    EXPECT_EQ(scene->mNumMeshes, 1U);
    const aiMesh *mesh = scene->mMeshes[0];
    const aiMaterial* mat = scene->mMaterials[mesh->mMaterialIndex];
    aiString name;
    ASSERT_EQ(aiReturn_SUCCESS, mat->Get(AI_MATKEY_NAME, name));
    EXPECT_STREQ("MyMaterial", name.C_Str());
}

TEST_F(utObjImportExport, import_point_cloud) {
    ::Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/point_cloud.obj", 0 );
    ASSERT_NE(nullptr, scene);
}

TEST_F(utObjImportExport, import_without_linend) {
    Assimp::Importer myImporter;
    const aiScene *scene = myImporter.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/box_without_lineending.obj", 0);
    ASSERT_NE(nullptr, scene);
}

TEST_F(utObjImportExport, import_with_line_continuations) {
    static const char *ObjModel =
        "v -0.5 -0.5 0.5\n"
        "v -0.5 \\\n"
        "  -0.5 -0.5\n"
        "v -0.5 \\\n"
        "   0.5 \\\n"
        "   -0.5\n"
        "f 1 2 3\n";

    Assimp::Importer myImporter;
    const aiScene *scene = myImporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), 0);
    EXPECT_NE(nullptr, scene);

    EXPECT_EQ(scene->mNumMeshes, 1U);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 3U);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 1U);

    auto vertices = scene->mMeshes[0]->mVertices;
    const float threshold = 0.0001f;

    EXPECT_NEAR(vertices[0].x, -0.5f, threshold);
    EXPECT_NEAR(vertices[0].y, -0.5f, threshold);
    EXPECT_NEAR(vertices[0].z, 0.5f, threshold);

    EXPECT_NEAR(vertices[1].x, -0.5f, threshold);
    EXPECT_NEAR(vertices[1].y, -0.5f, threshold);
    EXPECT_NEAR(vertices[1].z, -0.5f, threshold);

    EXPECT_NEAR(vertices[2].x, -0.5f, threshold);
    EXPECT_NEAR(vertices[2].y, 0.5f, threshold);
    EXPECT_NEAR(vertices[2].z, -0.5f, threshold);
}
