/*
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Open Asset Import Library (assimp)
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Copyright (c) 2006-2019, assimp team



All rights reserved.

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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/
#include "UnitTestPCH.h"

#include <assimp/scene.h>
#include "PostProcessing/SplitLargeMeshes.h"

using namespace std;
using namespace Assimp;

class SplitLargeMeshesTest : public ::testing::Test {
public:
    virtual void SetUp();
    virtual void TearDown();

protected:

    SplitLargeMeshesProcess_Triangle* piProcessTriangle;
    SplitLargeMeshesProcess_Vertex* piProcessVertex;

};

// ------------------------------------------------------------------------------------------------
void SplitLargeMeshesTest::SetUp()
{
    // construct the processes
    this->piProcessTriangle = new SplitLargeMeshesProcess_Triangle();
    this->piProcessVertex = new SplitLargeMeshesProcess_Vertex();

    this->piProcessTriangle->SetLimit(1000);
    this->piProcessVertex->SetLimit(1000);

}

// ------------------------------------------------------------------------------------------------
void SplitLargeMeshesTest::TearDown()
{
    delete this->piProcessTriangle;
    delete this->piProcessVertex;
}

// ------------------------------------------------------------------------------------------------
TEST_F(SplitLargeMeshesTest, testVertexSplit)
{
    std::vector< std::pair<aiMesh*, unsigned int> > avOut;

     aiMesh *pcMesh1 = new aiMesh();
     pcMesh1->mNumVertices = 2100; // quersumme: 3
     pcMesh1->mVertices = new aiVector3D[pcMesh1->mNumVertices];
     pcMesh1->mNormals = new aiVector3D[pcMesh1->mNumVertices];

     pcMesh1->mNumFaces = pcMesh1->mNumVertices / 3;
     pcMesh1->mFaces = new aiFace[pcMesh1->mNumFaces];

     unsigned int qq = 0;
     for (unsigned int i = 0; i < pcMesh1->mNumFaces;++i)
     {
         aiFace& face = pcMesh1->mFaces[i];
         face.mNumIndices = 3;
         face.mIndices = new unsigned int[3];
         face.mIndices[0] = qq++;
         face.mIndices[1] = qq++;
         face.mIndices[2] = qq++;
     }


    int iOldFaceNum = (int)pcMesh1->mNumFaces;
    piProcessVertex->SplitMesh(0,pcMesh1,avOut);

    for (std::vector< std::pair<aiMesh*, unsigned int> >::const_iterator
        iter =  avOut.begin(), end = avOut.end();
        iter != end; ++iter)
    {
        aiMesh* mesh = (*iter).first;
        EXPECT_LT(mesh->mNumVertices, 1000U);
        EXPECT_TRUE(NULL != mesh->mNormals);
        EXPECT_TRUE(NULL != mesh->mVertices);

        iOldFaceNum -= mesh->mNumFaces;
        delete mesh;
    }
    EXPECT_EQ(0, iOldFaceNum);
}

// ------------------------------------------------------------------------------------------------
TEST_F(SplitLargeMeshesTest, testTriangleSplit)
{
    std::vector< std::pair<aiMesh*, unsigned int> > avOut;

    // generate many, many faces with randomized indices for
    // the second mesh
    aiMesh *pcMesh2 = new aiMesh();
    pcMesh2->mNumVertices = 3000;
    pcMesh2->mVertices = new aiVector3D[pcMesh2->mNumVertices];
    pcMesh2->mNormals = new aiVector3D[pcMesh2->mNumVertices];

    pcMesh2->mNumFaces = 10000;
    pcMesh2->mFaces = new aiFace[pcMesh2->mNumFaces];

    for (unsigned int i = 0; i < pcMesh2->mNumFaces;++i)
    {
        aiFace& face = pcMesh2->mFaces[i];
        face.mNumIndices = 3;
        face.mIndices = new unsigned int[3];
        face.mIndices[0] = (unsigned int)((rand() / (float)RAND_MAX) * pcMesh2->mNumVertices);
        face.mIndices[1] = (unsigned int)((rand() / (float)RAND_MAX) * pcMesh2->mNumVertices);
        face.mIndices[2] = (unsigned int)((rand() / (float)RAND_MAX) * pcMesh2->mNumVertices);
    }

    // the number of faces shouldn't change
    int iOldFaceNum = (int)pcMesh2->mNumFaces;
    piProcessTriangle->SplitMesh(0,pcMesh2,avOut);

    for (std::vector< std::pair<aiMesh*, unsigned int> >::const_iterator
        iter =  avOut.begin(), end = avOut.end();
        iter != end; ++iter)
    {
        aiMesh* mesh = (*iter).first;
        EXPECT_LT(mesh->mNumFaces, 1000U);
        EXPECT_TRUE(NULL != mesh->mNormals);
        EXPECT_TRUE(NULL != mesh->mVertices);

        iOldFaceNum -= mesh->mNumFaces;
        delete mesh;
    }
    EXPECT_EQ(0, iOldFaceNum);
}
