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



All rights reserved.

Redistribution and use of this software in source and binary forms,
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following disclaimer.

* Redistributions in binary form must reproduce the above
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* Neither the name of the assimp team, nor the names of its
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/
#include "UnitTestPCH.h"

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


using namespace std;
using namespace Assimp;

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

protected:

    aiScene* scene;
    PretransformVertices* process;
};

// ------------------------------------------------------------------------------------------------
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 = sprintf(nd->mName.data,"%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()
{
    scene = new aiScene();

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

    // add 25 test meshes
    scene->mMeshes = new aiMesh*[scene->mNumMeshes = 25];
    for ( unsigned int i = 0; i < 25; ++i) {
        aiMesh* mesh = scene->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)
    scene->mRootNode = new aiNode();
    scene->mRootNode->mName.Set("Root");
    AddNodes(0,scene->mRootNode,2);

    process = new PretransformVertices();
}

// ------------------------------------------------------------------------------------------------
void PretransformVerticesTest::TearDown()
{
    delete scene;
    delete process;
}

// ------------------------------------------------------------------------------------------------
TEST_F(PretransformVerticesTest, testProcessCollapseHierarchy)
{
    process->KeepHierarchy(false);
    process->Execute(scene);

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

// ------------------------------------------------------------------------------------------------
TEST_F(PretransformVerticesTest, testProcessKeepHierarchy)
{
    process->KeepHierarchy(true);
    process->Execute(scene);

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