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#include "UnitTestPCH.h"

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

using namespace std;
using namespace Assimp;

class LimitBoneWeightsTest : public ::testing::Test {
public:
    LimitBoneWeightsTest() :
            Test(), mProcess(nullptr), mMesh(nullptr) {
        // empty
    }

protected:
    virtual void SetUp();
    virtual void TearDown();

protected:
    LimitBoneWeightsProcess *mProcess;
    aiMesh *mMesh;
};

// ------------------------------------------------------------------------------------------------
void LimitBoneWeightsTest::SetUp() {
    // construct the process
    this->mProcess = new LimitBoneWeightsProcess();

    // now need to create a nice mesh for testing purposes
    this->mMesh = new aiMesh();

    mMesh->mNumVertices = 500;
    mMesh->mVertices = new aiVector3D[500]; // uninit.
    mMesh->mNumBones = 30;
    mMesh->mBones = new aiBone *[30];
    unsigned int iCur = 0;
    for (unsigned int i = 0; i < 30; ++i) {
        aiBone *pc = mMesh->mBones[i] = new aiBone();
        pc->mNumWeights = 250;
        pc->mWeights = new aiVertexWeight[pc->mNumWeights];
        for (unsigned int qq = 0; qq < pc->mNumWeights; ++qq) {
            aiVertexWeight &v = pc->mWeights[qq];
            v.mVertexId = iCur++;
            if (500 == iCur) {
                iCur = 0;
            }
            v.mWeight = 1.0f / 15; // each vertex should occur once in two bones
        }
    }
}

// ------------------------------------------------------------------------------------------------
void LimitBoneWeightsTest::TearDown() {
    delete mMesh;
    delete mProcess;
}

// ------------------------------------------------------------------------------------------------
TEST_F(LimitBoneWeightsTest, testProcess) {
    // execute the step on the given data
    mProcess->ProcessMesh(mMesh);

    // check whether everything is ok ...
    typedef std::vector<LimitBoneWeightsProcess::Weight> VertexWeightList;
    VertexWeightList *asWeights = new VertexWeightList[mMesh->mNumVertices];

    for (unsigned int i = 0; i < mMesh->mNumVertices; ++i) {
        asWeights[i].reserve(4);
    }

    // sort back as per-vertex lists
    for (unsigned int i = 0; i < mMesh->mNumBones; ++i) {
        aiBone &pcBone = **(mMesh->mBones + i);
        for (unsigned int q = 0; q < pcBone.mNumWeights; ++q) {
            aiVertexWeight weight = pcBone.mWeights[q];
            asWeights[weight.mVertexId].emplace_back(i, weight.mWeight);
        }
    }

    // now validate the size of the lists and check whether all weights sum to 1.0f
    for (unsigned int i = 0; i < mMesh->mNumVertices; ++i) {
        EXPECT_LE(asWeights[i].size(), 4U);
        float fSum = 0.0f;
        for (VertexWeightList::const_iterator iter = asWeights[i].begin(); iter != asWeights[i].end(); ++iter) {
            fSum += (*iter).mWeight;
        }
        EXPECT_GE(fSum, 0.95F);
        EXPECT_LE(fSum, 1.04F);
    }

    // delete allocated storage
    delete[] asWeights;

    // everything seems to be OK
}