/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021, 2022 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include <sstream>
#include <Corrade/Containers/Optional.h>
#include <Corrade/Containers/String.h>
#include <Corrade/TestSuite/Tester.h>
#include <Corrade/TestSuite/Compare/Container.h>
#include <Corrade/Utility/DebugStl.h>
#include <Corrade/Utility/FormatStl.h>
#include <Corrade/Utility/Path.h>

#include "Magnum/Mesh.h"
#include "Magnum/Math/Vector3.h"
#include "Magnum/Trade/AbstractImporter.h"
#include "Magnum/Trade/MeshData.h"

#include "configure.h"

namespace Magnum { namespace Trade { namespace Test { namespace {

struct ObjImporterTest: TestSuite::Tester {
    explicit ObjImporterTest();

    void empty();

    void meshPrimitivePoints();
    void meshPrimitiveLines();
    void meshPrimitiveTriangles();

    /* Positions alone are tested above */
    void meshPositionsOptionalCoordinate();
    void meshTextureCoordinates();
    void meshTextureCoordinatesOptionalCoordinate();
    void meshNormals();
    void meshTextureCoordinatesNormals();

    void meshIgnoredKeyword();

    void meshNamed();
    void meshNamedFirstUnnamed();

    void moreMeshes();

    /* Technically, all invalid cases could be put into a single file, but
       because the indexing is global, it would get increasingly hard to
       maintain. So it's instead grouped into files by a common error scenario
       with each case testing one file and just the invalid() case testing
       separate files. */
    void invalid();
    void invalidNumbers();
    void invalidNumberCount();
    void invalidInconsistentIndexTuple();
    void invalidIncompleteData();
    void invalidOptionalCoordinate();

    void openTwice();
    void importTwice();

    /* Explicitly forbid system-wide plugin dependencies */
    PluginManager::Manager<AbstractImporter> _manager{"nonexistent"};
};

const struct {
    const char* name;
    const char* filename;
    const char* message;
} InvalidData[]{
    {"mixed primitives", "invalid-mixed-primitives.obj",
        "mixed primitive MeshPrimitive::Points and MeshPrimitive::Lines"},
    {"unknown keyword", "invalid-keyword.obj",
        "unknown keyword bleh"}
};

const struct {
    const char* name;
    const char* message;
} InvalidNumbersData[]{
    {"WrongFloat", "error while converting numeric data"},
    {"WrongInteger", "error while converting numeric data"},
    {"PositionIndexOutOfRange", "index 1 out of range for 1 vertices"},
    {"TextureIndexOutOfRange", "index 2 out of range for 1 vertices"},
    {"ZeroIndex", "index 0 out of range for 1 vertices"}
};

const struct {
    const char* name;
    const char* message;
} InvalidNumberCountData[]{
    {"ShortFloat", "invalid float array size"},
    {"LongFloat", "invalid float array size"},
    {"LongOptionalFloat", "invalid float array size"},
    {"InvalidIndices", "invalid index data"},
    {"WrongPointIndices", "wrong index count for point"},
    {"WrongLineIndices", "wrong index count for line"},
    {"WrongTriangleIndices", "wrong index count for triangle"},
    {"PolygonIndices", "polygons are not supported"}
};

const struct {
    const char* name;
    const char* message;
} InvalidInconsistentIndexTupleData[]{
    {"ShortNormalIndices", "some normal indices are missing"},
    {"ShortTextureIndices", "some texture coordinate indices are missing"},
};

const struct {
    const char* name;
    const char* message;
} InvalidIncompleteDataData[]{
    {"MissingPositionData", "incomplete position data"},
    {"MissingPositionIndices", "incomplete position data"},
    {"MissingNormalData", "incomplete normal data"},
    {"MissingNormalIndices", "incomplete normal data"},
    {"MissingTextureData", "incomplete texture coordinate data"},
    {"MissingTextureIndices", "incomplete texture coordinate data"},
};

const struct {
    const char* name;
    const char* message;
} InvalidOptionalCoordinateData[]{
    {"UnsupportedPositionW", "homogeneous coordinates are not supported"},
    {"UnsupportedTextureW", "3D texture coordinates are not supported"}
};

ObjImporterTest::ObjImporterTest() {
    addTests({&ObjImporterTest::empty,

              &ObjImporterTest::meshPrimitivePoints,
              &ObjImporterTest::meshPrimitiveLines,
              &ObjImporterTest::meshPrimitiveTriangles,

              &ObjImporterTest::meshPositionsOptionalCoordinate,
              &ObjImporterTest::meshTextureCoordinates,
              &ObjImporterTest::meshTextureCoordinatesOptionalCoordinate,
              &ObjImporterTest::meshNormals,
              &ObjImporterTest::meshTextureCoordinatesNormals,

              &ObjImporterTest::meshIgnoredKeyword,

              &ObjImporterTest::meshNamed,
              &ObjImporterTest::meshNamedFirstUnnamed,

              &ObjImporterTest::moreMeshes});

    addInstancedTests({&ObjImporterTest::invalid},
        Containers::arraySize(InvalidData));

    addInstancedTests({&ObjImporterTest::invalidNumbers},
        Containers::arraySize(InvalidNumbersData));

    addInstancedTests({&ObjImporterTest::invalidNumberCount},
        Containers::arraySize(InvalidNumberCountData));

    addInstancedTests({&ObjImporterTest::invalidInconsistentIndexTuple},
        Containers::arraySize(InvalidInconsistentIndexTupleData));

    addInstancedTests({&ObjImporterTest::invalidIncompleteData},
        Containers::arraySize(InvalidIncompleteDataData));

    addInstancedTests({&ObjImporterTest::invalidOptionalCoordinate},
        Containers::arraySize(InvalidOptionalCoordinateData));

    addTests({&ObjImporterTest::openTwice,
              &ObjImporterTest::importTwice});

    #ifdef OBJIMPORTER_PLUGIN_FILENAME
    CORRADE_INTERNAL_ASSERT_OUTPUT(_manager.load(OBJIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    #endif
}

void ObjImporterTest::empty() {
    /* Duplicates what's in invalidIncompleteData(MissingPositionData), but
       it's good to have such case explicit. It also tests for empty naming. */

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "empty.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);
    CORRADE_COMPARE(importer->meshName(0), "");
    CORRADE_COMPARE(importer->meshForName(""), -1);

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(0));
    CORRADE_COMPARE(out.str(), "Trade::ObjImporter::mesh(): incomplete position data\n");
}

void ObjImporterTest::meshPrimitivePoints() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-primitive-points.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Points);
    CORRADE_COMPARE(data->attributeCount(), 1);
    /* The points get reordered according to the index buffer. Might not be a
       problem in general but it is when relying on the order */
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {2.0f, 3.0f, 5.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 2, 0}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshPrimitiveLines() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-primitive-lines.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Lines);
    CORRADE_COMPARE(data->attributeCount(), 1);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {2.0f, 3.0f, 5.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 1, 2}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshPrimitiveTriangles() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-primitive-triangles.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Triangles);
    CORRADE_COMPARE(data->attributeCount(), 1);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {2.0f, 3.0f, 5.0f},
            {2.5f, 0.0f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 2, 3, 1, 0}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshPositionsOptionalCoordinate() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-positions-optional-coordinate.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->attributeCount(), 1);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {1.5f, 2.0f, 3.0f}
        }), TestSuite::Compare::Container);
}

void ObjImporterTest::meshTextureCoordinates() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-texture-coordinates.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Lines);
    CORRADE_COMPARE(data->attributeCount(), 2);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data->attribute<Vector2>(MeshAttribute::TextureCoordinates),
        Containers::arrayView<Vector2>({
            {1.0f, 0.5f},
            {1.0f, 0.5f},
            {0.5f, 1.0f},
            {0.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 2, 3, 1, 0}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshTextureCoordinatesOptionalCoordinate() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-texture-coordinates-optional-coordinate.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->attributeCount(MeshAttribute::TextureCoordinates), 1);
    CORRADE_COMPARE_AS(data->attribute<Vector2>(MeshAttribute::TextureCoordinates),
        Containers::arrayView<Vector2>({
            {0.5f, 0.7f}
        }), TestSuite::Compare::Container);
}

void ObjImporterTest::meshNormals() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-normals.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Lines);
    CORRADE_COMPARE(data->attributeCount(), 2);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Normal),
        Containers::arrayView<Vector3>({
            {1.0f, 0.5f, 3.5f},
            {1.0f, 0.5f, 3.5f},
            {0.5f, 1.0f, 0.5f},
            {0.5f, 1.0f, 0.5f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 2, 3, 1, 0}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshTextureCoordinatesNormals() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-texture-coordinates-normals.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Lines);
    CORRADE_COMPARE(data->attributeCount(), 3);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data->attribute<Vector2>(MeshAttribute::TextureCoordinates),
        Containers::arrayView<Vector2>({
            {1.0f, 0.5f},
            {1.0f, 0.5f},
            {0.5f, 1.0f},
            {0.5f, 1.0f},
            {0.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Normal),
        Containers::arrayView<Vector3>({
            {1.0f, 0.5f, 3.5f},
            {0.5f, 1.0f, 0.5f},
            {0.5f, 1.0f, 0.5f},
            {1.0f, 0.5f, 3.5f},
            {0.5f, 1.0f, 0.5f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 2, 3, 1, 0, 4, 2}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshIgnoredKeyword() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-ignored-keyword.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);

    /* Everything should be parsed properly */
    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Points);
    CORRADE_COMPARE(data->attributeCount(), 1);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.0f, 1.0f, 2.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::meshNamed() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-named.obj")));
    CORRADE_COMPARE(importer->meshCount(), 1);
    CORRADE_COMPARE(importer->meshName(0), "MyMesh");
    CORRADE_COMPARE(importer->meshForName("MyMesh"), 0);
}

void ObjImporterTest::meshNamedFirstUnnamed() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-named-first-unnamed.obj")));
    CORRADE_COMPARE(importer->meshCount(), 2);

    CORRADE_COMPARE(importer->meshName(0), "");
    CORRADE_COMPARE(importer->meshForName(""), -1);

    CORRADE_COMPARE(importer->meshName(1), "SecondMesh");
    CORRADE_COMPARE(importer->meshForName("SecondMesh"), 1);
}

void ObjImporterTest::moreMeshes() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-multiple.obj")));
    CORRADE_COMPARE(importer->meshCount(), 3);

    CORRADE_COMPARE(importer->meshName(0), "PointMesh");
    CORRADE_COMPARE(importer->meshForName("PointMesh"), 0);
    const Containers::Optional<MeshData> data = importer->mesh(0);
    CORRADE_VERIFY(data);
    CORRADE_COMPARE(data->primitive(), MeshPrimitive::Points);
    CORRADE_COMPARE(data->attributeCount(), 2);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data->attribute<Vector3>(MeshAttribute::Normal),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data->isIndexed());
    CORRADE_COMPARE(data->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1}),
        TestSuite::Compare::Container);

    CORRADE_COMPARE(importer->meshName(1), "LineMesh");
    CORRADE_COMPARE(importer->meshForName("LineMesh"), 1);
    const Containers::Optional<MeshData> data1 = importer->mesh(1);
    CORRADE_VERIFY(data1);
    CORRADE_COMPARE(data1->primitive(), MeshPrimitive::Lines);
    CORRADE_COMPARE(data1->attributeCount(), 2);
    CORRADE_COMPARE_AS(data1->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data1->attribute<Vector2>(MeshAttribute::TextureCoordinates),
        Containers::arrayView<Vector2>({
            {0.5f, 2.0f},
            {0.0f, 1.5f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data1->isIndexed());
    CORRADE_COMPARE(data1->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data1->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 1, 0}),
        TestSuite::Compare::Container);

    CORRADE_COMPARE(importer->meshName(2), "TriangleMesh");
    CORRADE_COMPARE(importer->meshForName("TriangleMesh"), 2);
    const Containers::Optional<MeshData> data2 = importer->mesh(2);
    CORRADE_VERIFY(data2);
    CORRADE_COMPARE(data2->primitive(), MeshPrimitive::Triangles);
    CORRADE_COMPARE(data2->attributeCount(), 3);
    CORRADE_COMPARE_AS(data2->attribute<Vector3>(MeshAttribute::Position),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.0f, 1.5f, 1.0f},
            {2.0f, 3.0f, 5.5f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data2->attribute<Vector3>(MeshAttribute::Normal),
        Containers::arrayView<Vector3>({
            {0.5f, 2.0f, 3.0f},
            {0.5f, 2.0f, 3.0f},
            {0.5f, 2.0f, 3.0f}
        }), TestSuite::Compare::Container);
    CORRADE_COMPARE_AS(data2->attribute<Vector2>(MeshAttribute::TextureCoordinates),
        Containers::arrayView<Vector2>({
            {0.5f, 2.0f},
            {0.5f, 2.0f},
            {0.5f, 2.0f}
        }), TestSuite::Compare::Container);
    CORRADE_VERIFY(data2->isIndexed());
    CORRADE_COMPARE(data2->indexType(), MeshIndexType::UnsignedInt);
    CORRADE_COMPARE_AS(data2->indices<UnsignedInt>(),
        Containers::arrayView<UnsignedInt>({0, 1, 2, 2, 1, 0}),
        TestSuite::Compare::Container);
}

void ObjImporterTest::invalid() {
    auto&& data = InvalidData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, data.filename)));

    CORRADE_COMPARE(importer->meshCount(), 1);

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(0));
    CORRADE_COMPARE(out.str(), Utility::formatString("Trade::ObjImporter::mesh(): {}\n", data.message));
}

void ObjImporterTest::invalidNumbers() {
    auto&& data = InvalidNumbersData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "invalid-numbers.obj")));

    /* Ensure we didn't forget to test any case */
    CORRADE_COMPARE(importer->meshCount(), Containers::arraySize(InvalidNumbersData));

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(data.name));
    CORRADE_COMPARE(out.str(), Utility::formatString("Trade::ObjImporter::mesh(): {}\n", data.message));
}

void ObjImporterTest::invalidNumberCount() {
    auto&& data = InvalidNumberCountData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "invalid-number-count.obj")));

    /* Ensure we didn't forget to test any case */
    CORRADE_COMPARE(importer->meshCount(), Containers::arraySize(InvalidNumberCountData));

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(data.name));
    CORRADE_COMPARE(out.str(), Utility::formatString("Trade::ObjImporter::mesh(): {}\n", data.message));
}

void ObjImporterTest::invalidInconsistentIndexTuple() {
    auto&& data = InvalidInconsistentIndexTupleData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "invalid-inconsistent-index-tuple.obj")));

    /* Ensure we didn't forget to test any case */
    CORRADE_COMPARE(importer->meshCount(), Containers::arraySize(InvalidInconsistentIndexTupleData));

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(data.name));
    CORRADE_COMPARE(out.str(), Utility::formatString("Trade::ObjImporter::mesh(): {}\n", data.message));
}

void ObjImporterTest::invalidIncompleteData() {
    auto&& data = InvalidIncompleteDataData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "invalid-incomplete-data.obj")));

    /* Ensure we didn't forget to test any case */
    CORRADE_COMPARE(importer->meshCount(), Containers::arraySize(InvalidIncompleteDataData));

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(data.name));
    CORRADE_COMPARE(out.str(), Utility::formatString("Trade::ObjImporter::mesh(): {}\n", data.message));
}

void ObjImporterTest::invalidOptionalCoordinate() {
    auto&& data = InvalidOptionalCoordinateData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "invalid-optional-coordinate.obj")));

    /* Ensure we didn't forget to test any case */
    CORRADE_COMPARE(importer->meshCount(), Containers::arraySize(InvalidOptionalCoordinateData));

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!importer->mesh(data.name));
    CORRADE_COMPARE(out.str(), Utility::formatString("Trade::ObjImporter::mesh(): {}\n", data.message));
}

void ObjImporterTest::openTwice() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");

    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-primitive-points.obj")));
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-primitive-points.obj")));

    /* Shouldn't crash, leak or anything */
}

void ObjImporterTest::importTwice() {
    Containers::Pointer<AbstractImporter> importer = _manager.instantiate("ObjImporter");
    CORRADE_VERIFY(importer->openFile(Utility::Path::join(OBJIMPORTER_TEST_DIR, "mesh-primitive-points.obj")));

    /* Verify that everything is working the same way on second use */
    {
        Containers::Optional<Trade::MeshData> mesh = importer->mesh(0);
        CORRADE_VERIFY(mesh);
        CORRADE_COMPARE(mesh->vertexCount(), 3);
    } {
        Containers::Optional<Trade::MeshData> mesh = importer->mesh(0);
        CORRADE_VERIFY(mesh);
        CORRADE_COMPARE(mesh->vertexCount(), 3);
    }
}

}}}}

CORRADE_TEST_MAIN(Magnum::Trade::Test::ObjImporterTest)