/*
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Open Asset Import Library (assimp)
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*/
#include "UnitTestPCH.h"

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

using namespace std;
using namespace Assimp;

class PretransformVerticesTest : public ::testing::Test {
public:
    PretransformVerticesTest() :
            Test(), mScene(nullptr), mProcess(nullptr) {
        // empty
    }

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

protected:
    aiScene *mScene;
    PretransformVertices *mProcess;
};

// ------------------------------------------------------------------------------------------------
void AddNodes(unsigned int num, aiNode *father, unsigned int depth) {
    father->mChildren = new aiNode *[father->mNumChildren = 5];
    for (unsigned int i = 0; i < 5; ++i) {
        aiNode *nd = father->mChildren[i] = new aiNode();

        nd->mName.length = snprintf(nd->mName.data, AI_MAXLEN, "%i%i", depth, i);

        // spawn two meshes
        nd->mMeshes = new unsigned int[nd->mNumMeshes = 2];
        nd->mMeshes[0] = num * 5 + i;
        nd->mMeshes[1] = 24 - (num * 5 + i); // mesh 12 is special ... it references the same mesh twice

        // setup an unique transformation matrix
        nd->mTransformation.a1 = num * 5.f + i + 1;
    }

    if (depth > 1) {
        for (unsigned int i = 0; i < 5; ++i) {
            AddNodes(i, father->mChildren[i], depth - 1);
        }
    }
}

// ------------------------------------------------------------------------------------------------
void PretransformVerticesTest::SetUp() {
    mScene = new aiScene();

    // add 5 empty materials
    mScene->mMaterials = new aiMaterial *[mScene->mNumMaterials = 5];
    for (unsigned int i = 0; i < 5; ++i) {
        mScene->mMaterials[i] = new aiMaterial();
    }

    // add 25 test meshes
    mScene->mMeshes = new aiMesh *[mScene->mNumMeshes = 25];
    for (unsigned int i = 0; i < 25; ++i) {
        aiMesh *mesh = mScene->mMeshes[i] = new aiMesh();

        mesh->mPrimitiveTypes = aiPrimitiveType_POINT;
        mesh->mFaces = new aiFace[mesh->mNumFaces = 10 + i];
        mesh->mVertices = new aiVector3D[mesh->mNumVertices = mesh->mNumFaces];
        for (unsigned int a = 0; a < mesh->mNumFaces; ++a) {
            aiFace &f = mesh->mFaces[a];
            f.mIndices = new unsigned int[f.mNumIndices = 1];
            f.mIndices[0] = a * 3;

            mesh->mVertices[a] = aiVector3D((float)i, (float)a, 0.f);
        }
        mesh->mMaterialIndex = i % 5;

        if (i % 2) {
            mesh->mNormals = new aiVector3D[mesh->mNumVertices];
            for (unsigned int normalIdx = 0; normalIdx < mesh->mNumVertices; ++normalIdx) {
                mesh->mNormals[normalIdx].x = 1.0f;
                mesh->mNormals[normalIdx].y = 1.0f;
                mesh->mNormals[normalIdx].z = 1.0f;
                mesh->mNormals[normalIdx].Normalize();
            }
        }
    }

    // construct some nodes (1+25)
    mScene->mRootNode = new aiNode();
    mScene->mRootNode->mName.Set("Root");
    AddNodes(0, mScene->mRootNode, 2);

    mProcess = new PretransformVertices();
}

// ------------------------------------------------------------------------------------------------
void PretransformVerticesTest::TearDown() {
    delete mScene;
    delete mProcess;
}

// ------------------------------------------------------------------------------------------------
TEST_F(PretransformVerticesTest, testProcessCollapseHierarchy) {
    mProcess->KeepHierarchy(false);
    mProcess->Execute(mScene);

    EXPECT_EQ(5U, mScene->mNumMaterials);
    EXPECT_EQ(10U, mScene->mNumMeshes); // every second mesh has normals
}

// ------------------------------------------------------------------------------------------------
TEST_F(PretransformVerticesTest, testProcessKeepHierarchy) {
    mProcess->KeepHierarchy(true);
    mProcess->Execute(mScene);

    EXPECT_EQ(5U, mScene->mNumMaterials);
    EXPECT_EQ(49U, mScene->mNumMeshes); // see note on mesh 12 above
}