/*
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Open Asset Import Library (assimp)
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  following disclaimer.

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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/
/** @file Implementation of the post processing step "MakeVerboseFormat"
*/


#include "MakeVerboseFormat.h"
#include "../include/assimp/scene.h"
#include "../include/assimp/DefaultLogger.hpp"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
MakeVerboseFormatProcess::MakeVerboseFormatProcess()
{
	// nothing to do here
}
// ------------------------------------------------------------------------------------------------
MakeVerboseFormatProcess::~MakeVerboseFormatProcess()
{
	// nothing to do here
}
// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
void MakeVerboseFormatProcess::Execute( aiScene* pScene)
{
	ai_assert(NULL != pScene);
	DefaultLogger::get()->debug("MakeVerboseFormatProcess begin");

	bool bHas = false;
	for( unsigned int a = 0; a < pScene->mNumMeshes; a++)
	{
		if(	MakeVerboseFormat( pScene->mMeshes[a]))
			bHas = true;
	}
	if (bHas) DefaultLogger::get()->info("MakeVerboseFormatProcess finished. There was much work to do ...");
	else DefaultLogger::get()->debug("MakeVerboseFormatProcess. There was nothing to do.");

	pScene->mFlags &= ~AI_SCENE_FLAGS_NON_VERBOSE_FORMAT;

}
// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
bool MakeVerboseFormatProcess::MakeVerboseFormat(aiMesh* pcMesh)
{
	ai_assert(NULL != pcMesh);

	unsigned int iOldNumVertices = pcMesh->mNumVertices;
	const unsigned int iNumVerts = pcMesh->mNumFaces*3;

	aiVector3D* pvPositions = new aiVector3D[ iNumVerts ];

	aiVector3D* pvNormals = NULL;
	if (pcMesh->HasNormals()) 
	{
		pvNormals = new aiVector3D[iNumVerts];
	}
	aiVector3D* pvTangents = NULL, *pvBitangents = NULL;
	if (pcMesh->HasTangentsAndBitangents()) 
	{
		pvTangents = new aiVector3D[iNumVerts];
		pvBitangents = new aiVector3D[iNumVerts];
	}

	aiVector3D* apvTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS] = {0};
	aiColor4D* apvColorSets[AI_MAX_NUMBER_OF_COLOR_SETS] = {0};

	unsigned int p = 0;
	while (pcMesh->HasTextureCoords(p))
		apvTextureCoords[p++] = new aiVector3D[iNumVerts];

	p = 0;
	while (pcMesh->HasVertexColors(p))
		apvColorSets[p++] = new aiColor4D[iNumVerts];

	// allocate enough memory to hold output bones and vertex weights ...
	std::vector<aiVertexWeight>* newWeights = new std::vector<aiVertexWeight>[pcMesh->mNumBones];
	for (unsigned int i = 0;i < pcMesh->mNumBones;++i) {
		newWeights[i].reserve(pcMesh->mBones[i]->mNumWeights*3);
	}

	// iterate through all faces and build a clean list
	unsigned int iIndex = 0;
	for (unsigned int a = 0; a< pcMesh->mNumFaces;++a)
	{
		aiFace* pcFace = &pcMesh->mFaces[a];
		for (unsigned int q = 0; q < pcFace->mNumIndices;++q,++iIndex)
		{
			// need to build a clean list of bones, too
			for (unsigned int i = 0;i < pcMesh->mNumBones;++i) 
			{
				for (unsigned int a = 0;  a < pcMesh->mBones[i]->mNumWeights;a++)
				{
					const aiVertexWeight& w = pcMesh->mBones[i]->mWeights[a];
					if(pcFace->mIndices[q] == w.mVertexId)
					{
						aiVertexWeight wNew;
						wNew.mVertexId = iIndex;
						wNew.mWeight = w.mWeight;
						newWeights[i].push_back(wNew);
					}
				}
			}

			pvPositions[iIndex] = pcMesh->mVertices[pcFace->mIndices[q]];

			if (pcMesh->HasNormals()) 
			{
				pvNormals[iIndex] = pcMesh->mNormals[pcFace->mIndices[q]];
			}
			if (pcMesh->HasTangentsAndBitangents()) 
			{
				pvTangents[iIndex] = pcMesh->mTangents[pcFace->mIndices[q]];
				pvBitangents[iIndex] = pcMesh->mBitangents[pcFace->mIndices[q]];
			}

			unsigned int p = 0;
			while (pcMesh->HasTextureCoords(p))
			{
				apvTextureCoords[p][iIndex] = pcMesh->mTextureCoords[p][pcFace->mIndices[q]];
				++p;
			}
			p = 0;
			while (pcMesh->HasVertexColors(p))
			{
				apvColorSets[p][iIndex] = pcMesh->mColors[p][pcFace->mIndices[q]];
				++p;
			}
			pcFace->mIndices[q] = iIndex;
		}
	}

	// build output vertex weights
	for (unsigned int i = 0;i < pcMesh->mNumBones;++i) 
	{
		delete pcMesh->mBones[i]->mWeights;
		if (!newWeights[i].empty())
		{
			pcMesh->mBones[i]->mWeights = new aiVertexWeight[newWeights[i].size()];
			memcpy(pcMesh->mBones[i]->mWeights,&newWeights[i][0],
				sizeof(aiVertexWeight) * newWeights[i].size());
		}
		else pcMesh->mBones[i]->mWeights = NULL;
	}

	// delete the old members
	delete[] pcMesh->mVertices;
	pcMesh->mVertices = pvPositions;

	p = 0;
	while (pcMesh->HasTextureCoords(p))
	{
		delete pcMesh->mTextureCoords[p];
		pcMesh->mTextureCoords[p] = apvTextureCoords[p];
		++p;
	}
	p = 0;
	while (pcMesh->HasVertexColors(p))
	{
		delete pcMesh->mColors[p];
		pcMesh->mColors[p] = apvColorSets[p];
		++p;
	}
	pcMesh->mNumVertices = iNumVerts;

	if (pcMesh->HasNormals()) 
	{
		delete[] pcMesh->mNormals;
		pcMesh->mNormals = pvNormals;
	}
	if (pcMesh->HasTangentsAndBitangents()) 
	{
		delete[] pcMesh->mTangents;
		pcMesh->mTangents = pvTangents;
		delete[] pcMesh->mBitangents;
		pcMesh->mBitangents = pvBitangents;
	}
	return (pcMesh->mNumVertices != iOldNumVertices);
}