/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------

Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the following 
conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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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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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*/

/** @file MD3Loader.cpp
 *  @brief Implementation of the MD3 importer class 
 * 
 *  Sources: 
 *     http://www.gamers.org/dEngine/quake3/UQ3S
 *     http://linux.ucla.edu/~phaethon/q3/formats/md3format.html
 *     http://www.heppler.com/shader/shader/
 */

#include "AssimpPCH.h"
#ifndef ASSIMP_BUILD_NO_MD3_IMPORTER

#include "MD3Loader.h"
#include "ByteSwap.h"
#include "SceneCombiner.h"
#include "GenericProperty.h"
#include "RemoveComments.h"
#include "ParsingUtils.h"

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Convert a Q3 shader blend function to the appropriate enum value
Q3Shader::BlendFunc StringToBlendFunc(const std::string& m)
{
	if (m == "GL_ONE") {
		return Q3Shader::BLEND_GL_ONE;
	}
	if (m == "GL_ZERO") {
		return Q3Shader::BLEND_GL_ZERO;
	}
	if (m == "GL_SRC_ALPHA") {
		return Q3Shader::BLEND_GL_SRC_ALPHA;
	}
	if (m == "GL_ONE_MINUS_SRC_ALPHA") {
		return Q3Shader::BLEND_GL_ONE_MINUS_SRC_ALPHA;
	}
	if (m == "GL_ONE_MINUS_DST_COLOR") {
		return Q3Shader::BLEND_GL_ONE_MINUS_DST_COLOR;
	}
	DefaultLogger::get()->error("Q3Shader: Unknown blend function: " + m);
	return Q3Shader::BLEND_NONE;
}

// ------------------------------------------------------------------------------------------------
// Load a Quake 3 shader
bool Q3Shader::LoadShader(ShaderData& fill, const std::string& pFile,IOSystem* io)
{
	boost::scoped_ptr<IOStream> file( io->Open( pFile, "rt"));
	if (!file.get())
		return false; // if we can't access the file, don't worry and return

	DefaultLogger::get()->info("Loading Quake3 shader file " + pFile);

	// read file in memory
	const size_t s = file->FileSize();
	std::vector<char> _buff(s+1);
	file->Read(&_buff[0],s,1);
	_buff[s] = 0;

	// remove comments from it (C++ style)
	CommentRemover::RemoveLineComments("//",&_buff[0]);
	const char* buff = &_buff[0];

	Q3Shader::ShaderDataBlock* curData = NULL;
	Q3Shader::ShaderMapBlock*  curMap  = NULL;

	// read line per line
	for (;SkipSpacesAndLineEnd(&buff);SkipLine(&buff)) {
	
		if (*buff == '{') {
			++buff;

			// append to last section, if any
			if (!curData) {
				DefaultLogger::get()->error("Q3Shader: Unexpected shader section token \'{\'");
				return true; // still no failure, the file is there
			}

			// read this data section
			for (;SkipSpacesAndLineEnd(&buff);SkipLine(&buff)) {
				if (*buff == '{') {
					++buff;
					// add new map section
					curData->maps.push_back(Q3Shader::ShaderMapBlock());
					curMap = &curData->maps.back();

					for (;SkipSpacesAndLineEnd(&buff);SkipLine(&buff)) {
						// 'map' - Specifies texture file name
						if (TokenMatchI(buff,"map",3) || TokenMatchI(buff,"clampmap",8)) {
							curMap->name = GetNextToken(buff);
						}	
						// 'blendfunc' - Alpha blending mode
						else if (TokenMatchI(buff,"blendfunc",9)) {	
							const std::string blend_src = GetNextToken(buff);
							if (blend_src == "add") {
								curMap->blend_src  = Q3Shader::BLEND_GL_ONE;
								curMap->blend_dest = Q3Shader::BLEND_GL_ONE;
							}
							else if (blend_src == "filter") {
								curMap->blend_src  = Q3Shader::BLEND_GL_DST_COLOR;
								curMap->blend_dest = Q3Shader::BLEND_GL_ZERO;
							}
							else if (blend_src == "blend") {
								curMap->blend_src  = Q3Shader::BLEND_GL_SRC_ALPHA;
								curMap->blend_dest = Q3Shader::BLEND_GL_ONE_MINUS_SRC_ALPHA;
							}
							else {
								curMap->blend_src  = StringToBlendFunc(blend_src);
								curMap->blend_dest = StringToBlendFunc(GetNextToken(buff));
							}
						}
						// 'alphafunc' - Alpha testing mode
						else if (TokenMatchI(buff,"alphafunc",9)) {	
							const std::string at = GetNextToken(buff);
							if (at == "GT0") {
								curMap->alpha_test = Q3Shader::AT_GT0;
							}
							else if (at == "LT128") {
								curMap->alpha_test = Q3Shader::AT_LT128;
							}
							else if (at == "GE128") {
								curMap->alpha_test = Q3Shader::AT_GE128;
							}
						}
						else if (*buff == '}') {
							++buff;
							// close this map section
							curMap = NULL;
							break;
						}
					}

				}
				else if (*buff == '}') {
					++buff;
					curData = NULL;					
					break;
				}

				// 'cull' specifies culling behaviour for the model
				else if (TokenMatchI(buff,"cull",4)) {
					SkipSpaces(&buff);
					if (!ASSIMP_strincmp(buff,"back",4)) {
						curData->cull = Q3Shader::CULL_CCW;
					}
					else if (!ASSIMP_strincmp(buff,"front",5)) {
						curData->cull = Q3Shader::CULL_CW;
					}
					else if (!ASSIMP_strincmp(buff,"none",4) || !ASSIMP_strincmp(buff,"disable",7)) {
						curData->cull = Q3Shader::CULL_NONE;
					}
					else DefaultLogger::get()->error("Q3Shader: Unrecognized cull mode");
				}
			}
		}

		else {
			// add new section
			fill.blocks.push_back(Q3Shader::ShaderDataBlock());
			curData = &fill.blocks.back();

			// get the name of this section
			curData->name = GetNextToken(buff);
		}
	}
	return true;
}

// ------------------------------------------------------------------------------------------------
// Load a Quake 3 skin
bool Q3Shader::LoadSkin(SkinData& fill, const std::string& pFile,IOSystem* io)
{
	boost::scoped_ptr<IOStream> file( io->Open( pFile, "rt"));
	if (!file.get())
		return false; // if we can't access the file, don't worry and return

	DefaultLogger::get()->info("Loading Quake3 skin file " + pFile);

	// read file in memory
	const size_t s = file->FileSize();
	std::vector<char> _buff(s+1);const char* buff = &_buff[0];
	file->Read(&_buff[0],s,1);
	_buff[s] = 0;

	// remove commas
	std::replace(_buff.begin(),_buff.end(),',',' ');

	// read token by token and fill output table
	for (;*buff;) {
		SkipSpacesAndLineEnd(&buff);

		// get first identifier
		std::string ss = GetNextToken(buff);
		
		// ignore tokens starting with tag_
		if (!::strncmp(&ss[0],"tag_",std::min((size_t)4, ss.length())))
			continue;

		fill.textures.push_back(SkinData::TextureEntry());
		SkinData::TextureEntry& s = fill.textures.back();

		s.first  = ss;
		s.second = GetNextToken(buff);
	}
	return true;
}

// ------------------------------------------------------------------------------------------------
// Convert Q3Shader to material
void Q3Shader::ConvertShaderToMaterial(MaterialHelper* out, const ShaderDataBlock& shader)
{
	ai_assert(NULL != out);

	/*  IMPORTANT: This is not a real conversion. Actually we're just guessing and
	 *  hacking around to build an aiMaterial that looks nearly equal to the
	 *  original Quake 3 shader. We're missing some important features like
	 *  animatable material properties in our material system, but at least 
	 *  multiple textures should be handled correctly.
	 */ 

	// Two-sided material?
	if (shader.cull == Q3Shader::CULL_NONE) {
		const int twosided = 1;
		out->AddProperty(&twosided,1,AI_MATKEY_TWOSIDED);
	}

	unsigned int cur_emissive = 0, cur_diffuse = 0, cur_lm =0;

	// Iterate through all textures
	for (std::list< Q3Shader::ShaderMapBlock >::const_iterator it = shader.maps.begin(); it != shader.maps.end();++it) {
		
		// CONVERSION BEHAVIOUR:
		//
		//
		// If the texture is additive
		//  - if it is the first texture, assume additive blending for the whole material
		//  - otherwise register it as emissive texture.
		//
		// If the texture is using standard blend (or if the blend mode is unknown)
		//  - if first texture: assume default blending for material
		//  - in any case: set it as diffuse texture
		//
		// If the texture is using 'filter' blending
		//  - take as lightmap
		//
		// Textures with alpha funcs
		//  - aiTextureFlags_UseAlpha is set (otherwise aiTextureFlags_NoAlpha is explicitly set)
		aiString s((*it).name);
		aiTextureType type; unsigned int index;

		if ((*it).blend_src == Q3Shader::BLEND_GL_ONE && (*it).blend_dest == Q3Shader::BLEND_GL_ONE) {
			if (it == shader.maps.begin()) {
				const int additive = aiBlendMode_Additive;
				out->AddProperty(&additive,1,AI_MATKEY_BLEND_FUNC);
				
				index = cur_diffuse++;
				type  = aiTextureType_DIFFUSE;
			}
			else {
				index = cur_emissive++;
				type  = aiTextureType_EMISSIVE;
			}
		}
		else if ((*it).blend_src == Q3Shader::BLEND_GL_DST_COLOR && (*it).blend_dest == Q3Shader::BLEND_GL_ZERO) {
			index = cur_lm++;
			type  = aiTextureType_LIGHTMAP;
		}
		else {
			const int blend = aiBlendMode_Default;
			out->AddProperty(&blend,1,AI_MATKEY_BLEND_FUNC);
			
			index = cur_diffuse++;
			type  = aiTextureType_DIFFUSE;
		}

		// setup texture
		out->AddProperty(&s,AI_MATKEY_TEXTURE(type,index));

		// setup texture flags
		const int use_alpha = ((*it).alpha_test != Q3Shader::AT_NONE ? aiTextureFlags_UseAlpha : aiTextureFlags_IgnoreAlpha);
		out->AddProperty(&use_alpha,1,AI_MATKEY_TEXFLAGS(type,index));
	}
	// If at least one emissive texture was set, set the emissive base color to 1 to ensure
	// the texture is actually displayed.
	if (0 != cur_emissive) {
		aiColor3D one(1.f,1.f,1.f);
		out->AddProperty(&one,1,AI_MATKEY_COLOR_EMISSIVE);
	}
}

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
MD3Importer::MD3Importer()
: configFrameID  (0)
, configHandleMP (true)
{}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
MD3Importer::~MD3Importer()
{}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MD3Importer::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	const std::string extension = GetExtension(pFile);
	if (extension == "md3")
		return true;

	// if check for extension is not enough, check for the magic tokens 
	if (!extension.length() || checkSig) {
		uint32_t tokens[1]; 
		tokens[0] = AI_MD3_MAGIC_NUMBER_LE;
		return CheckMagicToken(pIOHandler,pFile,tokens,1);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
void MD3Importer::ValidateHeaderOffsets()
{
	// Check magic number
	if (pcHeader->IDENT != AI_MD3_MAGIC_NUMBER_BE &&
		pcHeader->IDENT != AI_MD3_MAGIC_NUMBER_LE)
			throw new ImportErrorException( "Invalid MD3 file: Magic bytes not found");

	// Check file format version
	if (pcHeader->VERSION > 15)
		DefaultLogger::get()->warn( "Unsupported MD3 file version. Continuing happily ...");

	// Check some offset values whether they are valid
	if (!pcHeader->NUM_SURFACES)
		throw new ImportErrorException( "Invalid md3 file: NUM_SURFACES is 0");

	if (pcHeader->OFS_FRAMES >= fileSize || pcHeader->OFS_SURFACES >= fileSize || 
		pcHeader->OFS_EOF > fileSize) {
		throw new ImportErrorException("Invalid MD3 header: some offsets are outside the file");
	}

	if (pcHeader->NUM_FRAMES <= configFrameID )
		throw new ImportErrorException("The requested frame is not existing the file");
}

// ------------------------------------------------------------------------------------------------
void MD3Importer::ValidateSurfaceHeaderOffsets(const MD3::Surface* pcSurf)
{
	// Calculate the relative offset of the surface
	const int32_t ofs = int32_t((const unsigned char*)pcSurf-this->mBuffer);

	// Check whether all data chunks are inside the valid range
	if (pcSurf->OFS_TRIANGLES + ofs + pcSurf->NUM_TRIANGLES * sizeof(MD3::Triangle)	> fileSize  ||
		pcSurf->OFS_SHADERS + ofs + pcSurf->NUM_SHADER * sizeof(MD3::Shader) > fileSize         ||
		pcSurf->OFS_ST + ofs + pcSurf->NUM_VERTICES * sizeof(MD3::TexCoord) > fileSize          ||
		pcSurf->OFS_XYZNORMAL + ofs + pcSurf->NUM_VERTICES * sizeof(MD3::Vertex) > fileSize)	{

		throw new ImportErrorException("Invalid MD3 surface header: some offsets are outside the file");
	}

	// Check whether all requirements for Q3 files are met. We don't
	// care, but probably someone does.
	if (pcSurf->NUM_TRIANGLES > AI_MD3_MAX_TRIANGLES)
		DefaultLogger::get()->warn("MD3: Quake III triangle limit exceeded");
	if (pcSurf->NUM_SHADER > AI_MD3_MAX_SHADERS)
		DefaultLogger::get()->warn("MD3: Quake III shader limit exceeded");
	if (pcSurf->NUM_VERTICES > AI_MD3_MAX_VERTS)
		DefaultLogger::get()->warn("MD3: Quake III vertex limit exceeded");
	if (pcSurf->NUM_FRAMES > AI_MD3_MAX_FRAMES)
		DefaultLogger::get()->warn("MD3: Quake III frame limit exceeded");
}

// ------------------------------------------------------------------------------------------------
void MD3Importer::GetExtensionList(std::string& append)
{
	append.append("*.md3");
}

// ------------------------------------------------------------------------------------------------
// Setup configuration properties
void MD3Importer::SetupProperties(const Importer* pImp)
{
	// The 
	// AI_CONFIG_IMPORT_MD3_KEYFRAME option overrides the
	// AI_CONFIG_IMPORT_GLOBAL_KEYFRAME option.
	configFrameID = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_MD3_KEYFRAME,0xffffffff);
	if(0xffffffff == configFrameID) {
		configFrameID = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_GLOBAL_KEYFRAME,0);
	}

	// AI_CONFIG_IMPORT_MD3_HANDLE_MULTIPART
	configHandleMP = (0 != pImp->GetPropertyInteger(AI_CONFIG_IMPORT_MD3_HANDLE_MULTIPART,1));

	// AI_CONFIG_IMPORT_MD3_SKIN_NAME
	configSkinFile = (pImp->GetPropertyString(AI_CONFIG_IMPORT_MD3_SKIN_NAME,"default"));

	// AI_CONFIG_IMPORT_MD3_SHADER_SRC
	configShaderFile = (pImp->GetPropertyString(AI_CONFIG_IMPORT_MD3_SHADER_SRC,""));

	// AI_CONFIG_FAVOUR_SPEED
	configSpeedFlag = (0 != pImp->GetPropertyInteger(AI_CONFIG_FAVOUR_SPEED,0));
}

// ------------------------------------------------------------------------------------------------
// Try to read the skin for a MD3 file
void MD3Importer::ReadSkin(Q3Shader::SkinData& fill) const
{
	// skip any postfixes (e.g. lower_1.md3)
	std::string::size_type s = filename.find_last_of('_');
	if (s == std::string::npos) {
		s = filename.find_last_of('.');
	}
	ai_assert(s != std::string::npos);

	const std::string skin_file = path + filename.substr(0,s) + "_" + configSkinFile + ".skin";
	Q3Shader::LoadSkin(fill,skin_file,mIOHandler);
}

// ------------------------------------------------------------------------------------------------
// Try to read the shader for a MD3 file
void MD3Importer::ReadShader(Q3Shader::ShaderData& fill) const
{
	// Determine Q3 model name from given path
	std::string::size_type s = path.find_last_of("\\/",path.length()-2);
	const std::string model_file = path.substr(s+1,path.length()-(s+2));

	// If no specific dir or file is given, use our default search behaviour
	if (!configShaderFile.length()) {
		if(!Q3Shader::LoadShader(fill,path + "..\\..\\..\\scripts\\" + model_file + ".shader",mIOHandler)) {
			Q3Shader::LoadShader(fill,path + "..\\..\\..\\scripts\\" + filename + ".shader",mIOHandler);
		}
	}
	else {
		// If the given string specifies a file, load this file.
		// Otherwise it's a directory.
		std::string::size_type st = configShaderFile.find_last_of('.');
		if (st == std::string::npos) {
			
			if(!Q3Shader::LoadShader(fill,configShaderFile + model_file + ".shader",mIOHandler)) {
				Q3Shader::LoadShader(fill,configShaderFile + filename + ".shader",mIOHandler);
			}
		}
		else {
			Q3Shader::LoadShader(fill,configShaderFile,mIOHandler);
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Tiny helper to remove a single node from its parent' list
void RemoveSingleNodeFromList(aiNode* nd)
{
	if (!nd || nd->mNumChildren || !nd->mParent)return;
	aiNode* par = nd->mParent;
	for (unsigned int i = 0; i < par->mNumChildren;++i) {
		if (par->mChildren[i] == nd) { 
			--par->mNumChildren;
			for (;i < par->mNumChildren;++i) {
				par->mChildren[i] = par->mChildren[i+1];
			}
			delete nd;
			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Read a multi-part Q3 player model
bool MD3Importer::ReadMultipartFile()
{
	// check whether the file name contains a common postfix, e.g lower_2.md3
	std::string::size_type s = filename.find_last_of('_'), t = filename.find_last_of('.');
	ai_assert(t != std::string::npos);
	if (s == std::string::npos)
		s = t;

	const std::string mod_filename = filename.substr(0,s);
	const std::string suffix = filename.substr(s,t-s);

	if (mod_filename == "lower" || mod_filename == "upper" || mod_filename == "head"){
		const std::string lower = path + "lower" + suffix + ".md3";
		const std::string upper = path + "upper" + suffix + ".md3";
		const std::string head  = path + "head"  + suffix + ".md3";

		aiScene* scene_upper = NULL;
		aiScene* scene_lower = NULL;
		aiScene* scene_head = NULL;
		std::string failure;

		aiNode* tag_torso, *tag_head;
		std::vector<AttachmentInfo> attach;

		DefaultLogger::get()->info("Multi part MD3 player model: lower, upper and head parts are joined");

		// ensure we won't try to load ourselves recursively
		BatchLoader::PropertyMap props;
		SetGenericProperty( props.ints, AI_CONFIG_IMPORT_MD3_HANDLE_MULTIPART, 0, NULL);

		// now read these three files
		BatchLoader batch(mIOHandler);
		const unsigned int _lower = batch.AddLoadRequest(lower,0,&props);
		const unsigned int _upper = batch.AddLoadRequest(upper,0,&props);
		const unsigned int _head  = batch.AddLoadRequest(head,0,&props);
		batch.LoadAll();

		// now construct a dummy scene to place these three parts in
		aiScene* master   = new aiScene();
		aiNode* nd = master->mRootNode = new aiNode();
		nd->mName.Set("<MD3_Player>");

		// ... and get them. We need all of them.
		scene_lower = batch.GetImport(_lower);
		if (!scene_lower) {
			DefaultLogger::get()->error("M3D: Failed to read multi part model, lower.md3 fails to load");
			failure = "lower";
			goto error_cleanup;
		}

		scene_upper = batch.GetImport(_upper);
		if (!scene_upper) {
			DefaultLogger::get()->error("M3D: Failed to read multi part model, upper.md3 fails to load");
			failure = "upper";
			goto error_cleanup;
		}

		scene_head  = batch.GetImport(_head);
		if (!scene_head) {
			DefaultLogger::get()->error("M3D: Failed to read multi part model, head.md3 fails to load");
			failure = "head";
			goto error_cleanup;
		}

		// build attachment infos. search for typical Q3 tags

		// original root
		scene_lower->mRootNode->mName.Set("lower");
		attach.push_back(AttachmentInfo(scene_lower, nd));

		// tag_torso
		tag_torso = scene_lower->mRootNode->FindNode("tag_torso");
		if (!tag_torso) {
			DefaultLogger::get()->error("M3D: Failed to find attachment tag for multi part model: tag_torso expected");
			goto error_cleanup;
		}
		scene_upper->mRootNode->mName.Set("upper");
		attach.push_back(AttachmentInfo(scene_upper,tag_torso));

		// tag_head
		tag_head = scene_upper->mRootNode->FindNode("tag_head");
		if (!tag_head) {
			DefaultLogger::get()->error("M3D: Failed to find attachment tag for multi part model: tag_head expected");
			goto error_cleanup;
		}
		scene_head->mRootNode->mName.Set("head");
		attach.push_back(AttachmentInfo(scene_head,tag_head));

		// Remove tag_head and tag_torso from all other model parts ...
		// this ensures (together with AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES_IF_NECESSARY)
		// that tag_torso/tag_head is also the name of the (unique) output node
		RemoveSingleNodeFromList (scene_upper->mRootNode->FindNode("tag_torso"));
		RemoveSingleNodeFromList (scene_head-> mRootNode->FindNode("tag_head" ));

		// Undo the rotations which we applied to the coordinate systems. We're
		// working in global Quake space here
		scene_head->mRootNode->mTransformation  = aiMatrix4x4();
		scene_lower->mRootNode->mTransformation = aiMatrix4x4();
		scene_upper->mRootNode->mTransformation = aiMatrix4x4();

		// and merge the scenes
		SceneCombiner::MergeScenes(&mScene,master, attach,
			AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES          |
			AI_INT_MERGE_SCENE_GEN_UNIQUE_MATNAMES       |
			AI_INT_MERGE_SCENE_RESOLVE_CROSS_ATTACHMENTS |
			(!configSpeedFlag ? AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES_IF_NECESSARY : 0));

		// Now rotate the whole scene 90 degrees around the x axis to convert to internal coordinate system
		mScene->mRootNode->mTransformation = aiMatrix4x4(1.f,0.f,0.f,0.f,
			0.f,0.f,1.f,0.f,0.f,-1.f,0.f,0.f,0.f,0.f,0.f,1.f);

		return true;

error_cleanup:
		delete scene_upper;
		delete scene_lower;
		delete scene_head;
		delete master;

		if (failure == mod_filename) {
			throw new ImportErrorException("MD3: failure to read multipart host file");
		}
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Convert a MD3 path to a proper value
void MD3Importer::ConvertPath(const char* texture_name, const char* header_name, std::string& out) const
{
	// If the MD3's internal path itself and the given path are using
	// the same directory, remove it completely to get right output paths.
	const char* end1 = ::strrchr(header_name,'\\');
	if (!end1)end1   = ::strrchr(header_name,'/');

	const char* end2 = ::strrchr(texture_name,'\\');
	if (!end2)end2   = ::strrchr(texture_name,'/');

	// HACK: If the paths starts with "models", ignore the
	// next two hierarchy levels, it specifies just the model name.
	// Ignored by Q3, it might be not equal to the real model location.
	if (end2)	{

		size_t len2;
		const size_t len1 = (size_t)(end1 - header_name);
		if (!ASSIMP_strincmp(texture_name,"models",6) && (texture_name[6] == '/' || texture_name[6] == '\\')) {
			len2 = 6; // ignore the seventh - could be slash or backslash

			if (!header_name[0]) {
				// Use the file name only
				out = end2+1;
				return;
			}
		}
		else len2 = std::min (len1, (size_t)(end2 - texture_name ));
		if (!ASSIMP_strincmp(texture_name,header_name,len2)) {
			// Use the file name only
			out = end2+1;
			return;
		}
	}
	// Use the full path
	out = texture_name;
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void MD3Importer::InternReadFile( const std::string& pFile, 
	aiScene* pScene, IOSystem* pIOHandler)
{
	mFile = pFile;
	mScene = pScene;
	mIOHandler = pIOHandler;

	// get base path and file name
	// todo ... move to PathConverter
	std::string::size_type s = mFile.find_last_of("/\\");
	if (s == std::string::npos) {
		s = 0;
	}
	else ++s;
	filename = mFile.substr(s), path = mFile.substr(0,s);
	for( std::string::iterator it = filename .begin(); it != filename.end(); ++it)
		*it = tolower( *it);

	// Load multi-part model file, if necessary
	if (configHandleMP) {
		if (ReadMultipartFile())
			return;
	}

	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile));

	// Check whether we can read from the file
	if( file.get() == NULL)
		throw new ImportErrorException( "Failed to open MD3 file " + pFile + ".");

	// Check whether the md3 file is large enough to contain the header
	fileSize = (unsigned int)file->FileSize();
	if( fileSize < sizeof(MD3::Header))
		throw new ImportErrorException( "MD3 File is too small.");

	// Allocate storage and copy the contents of the file to a memory buffer
	std::vector<unsigned char> mBuffer2 (fileSize);
	file->Read( &mBuffer2[0], 1, fileSize);
	mBuffer = &mBuffer2[0];

	pcHeader = (BE_NCONST MD3::Header*)mBuffer;

	// Ensure correct endianess
#ifdef AI_BUILD_BIG_ENDIAN

	AI_SWAP4(pcHeader->VERSION);
	AI_SWAP4(pcHeader->FLAGS);
	AI_SWAP4(pcHeader->IDENT);
	AI_SWAP4(pcHeader->NUM_FRAMES);
	AI_SWAP4(pcHeader->NUM_SKINS);
	AI_SWAP4(pcHeader->NUM_SURFACES);
	AI_SWAP4(pcHeader->NUM_TAGS);
	AI_SWAP4(pcHeader->OFS_EOF);
	AI_SWAP4(pcHeader->OFS_FRAMES);
	AI_SWAP4(pcHeader->OFS_SURFACES);
	AI_SWAP4(pcHeader->OFS_TAGS);

#endif

	// Validate the file header
	ValidateHeaderOffsets();

	// Navigate to the list of surfaces
	BE_NCONST MD3::Surface* pcSurfaces = (BE_NCONST MD3::Surface*)(mBuffer + pcHeader->OFS_SURFACES);

	// Navigate to the list of tags
	BE_NCONST MD3::Tag* pcTags = (BE_NCONST MD3::Tag*)(mBuffer + pcHeader->OFS_TAGS);

	// Allocate output storage
	pScene->mNumMeshes = pcHeader->NUM_SURFACES;
	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];

	pScene->mNumMaterials = pcHeader->NUM_SURFACES;
	pScene->mMaterials = new aiMaterial*[pScene->mNumMeshes];

	// Set arrays to zero to ensue proper destruction if an exception is raised
	::memset(pScene->mMeshes,0,pScene->mNumMeshes*sizeof(aiMesh*));
	::memset(pScene->mMaterials,0,pScene->mNumMaterials*sizeof(aiMaterial*));

	// Now read possible skins from .skin file
	Q3Shader::SkinData skins;
	ReadSkin(skins);

	// And check whether we can locate a shader file for this model
	Q3Shader::ShaderData shaders;
	ReadShader(shaders);

	// Adjust all texture paths in the shader
	const char* header_name = pcHeader->NAME;
	if (shaders.blocks.size()) {
		for (std::list< Q3Shader::ShaderDataBlock >::iterator dit = shaders.blocks.begin(); dit != shaders.blocks.end(); ++dit) {
			ConvertPath((*dit).name.c_str(),header_name,(*dit).name);

			for (std::list< Q3Shader::ShaderMapBlock >::iterator mit = (*dit).maps.begin(); mit != (*dit).maps.end(); ++mit) {
				ConvertPath((*mit).name.c_str(),header_name,(*mit).name);
			}
		}
	}

	// Read all surfaces from the file
	unsigned int iNum = pcHeader->NUM_SURFACES;
	unsigned int iNumMaterials = 0;
	while (iNum-- > 0)	{

		// Ensure correct endianess
#ifdef AI_BUILD_BIG_ENDIAN

		AI_SWAP4(pcSurfaces->FLAGS);
		AI_SWAP4(pcSurfaces->IDENT);
		AI_SWAP4(pcSurfaces->NUM_FRAMES);
		AI_SWAP4(pcSurfaces->NUM_SHADER);
		AI_SWAP4(pcSurfaces->NUM_TRIANGLES);
		AI_SWAP4(pcSurfaces->NUM_VERTICES);
		AI_SWAP4(pcSurfaces->OFS_END);
		AI_SWAP4(pcSurfaces->OFS_SHADERS);
		AI_SWAP4(pcSurfaces->OFS_ST);
		AI_SWAP4(pcSurfaces->OFS_TRIANGLES);
		AI_SWAP4(pcSurfaces->OFS_XYZNORMAL);

#endif

		// Validate the surface header
		ValidateSurfaceHeaderOffsets(pcSurfaces);

		// Navigate to the vertex list of the surface
		BE_NCONST MD3::Vertex* pcVertices = (BE_NCONST MD3::Vertex*)
			(((uint8_t*)pcSurfaces) + pcSurfaces->OFS_XYZNORMAL);

		// Navigate to the triangle list of the surface
		BE_NCONST MD3::Triangle* pcTriangles = (BE_NCONST MD3::Triangle*)
			(((uint8_t*)pcSurfaces) + pcSurfaces->OFS_TRIANGLES);

		// Navigate to the texture coordinate list of the surface
		BE_NCONST MD3::TexCoord* pcUVs = (BE_NCONST MD3::TexCoord*)
			(((uint8_t*)pcSurfaces) + pcSurfaces->OFS_ST);

		// Navigate to the shader list of the surface
		BE_NCONST MD3::Shader* pcShaders = (BE_NCONST MD3::Shader*)
			(((uint8_t*)pcSurfaces) + pcSurfaces->OFS_SHADERS);

		// If the submesh is empty ignore it
		if (0 == pcSurfaces->NUM_VERTICES || 0 == pcSurfaces->NUM_TRIANGLES)
		{
			pcSurfaces = (BE_NCONST MD3::Surface*)(((uint8_t*)pcSurfaces) + pcSurfaces->OFS_END);
			pScene->mNumMeshes--;
			continue;
		}

		// Allocate output mesh
		pScene->mMeshes[iNum] = new aiMesh();
		aiMesh* pcMesh = pScene->mMeshes[iNum];

		std::string _texture_name;
		const char* texture_name = NULL;

		// Check whether we have a texture record for this surface in the .skin file
		std::list< Q3Shader::SkinData::TextureEntry >::iterator it = std::find( 
			skins.textures.begin(), skins.textures.end(), pcSurfaces->NAME );

		if (it != skins.textures.end()) {
			texture_name = &*( _texture_name = (*it).second).begin();
			DefaultLogger::get()->debug("MD3: Assigning skin texture " + (*it).second + " to surface " + pcSurfaces->NAME);
			(*it).resolved = true; // mark entry as resolved
		}

		// Get the first shader (= texture?) assigned to the surface
		if (!texture_name && pcSurfaces->NUM_SHADER)	{
			texture_name = pcShaders->NAME;
		}

		std::string convertedPath;
		if (texture_name) {
			ConvertPath(texture_name,header_name,convertedPath);
		}

		const Q3Shader::ShaderDataBlock* shader = NULL;

		// Now search the current shader for a record with this name (
		// excluding texture file extension)
		if (shaders.blocks.size()) {

			std::string::size_type s = convertedPath.find_last_of('.');
			if (s == std::string::npos)
				s = convertedPath.length();

			const std::string without_ext = convertedPath.substr(0,s);
			std::list< Q3Shader::ShaderDataBlock >::const_iterator dit = std::find(shaders.blocks.begin(),shaders.blocks.end(),without_ext);
			if (dit != shaders.blocks.end()) {
				// Hurra, wir haben einen. Tolle Sache.
				shader = &*dit;
				DefaultLogger::get()->info("Found shader record for " +without_ext );
			}
			else DefaultLogger::get()->warn("Unable to find shader record for " +without_ext );
		}

		MaterialHelper* pcHelper = new MaterialHelper();

		const int iMode = (int)aiShadingMode_Gouraud;
		pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

		// Add a small ambient color value - Quake 3 seems to have one
		aiColor3D clr;
		clr.b = clr.g = clr.r = 0.05f;
		pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_AMBIENT);

		clr.b = clr.g = clr.r = 1.0f;
		pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_DIFFUSE);
		pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_SPECULAR);

		// use surface name + skin_name as material name
		aiString name;
		name.Set("MD3_[" + configSkinFile + "][" + pcSurfaces->NAME + "]");
		pcHelper->AddProperty(&name,AI_MATKEY_NAME);

		if (!shader) {
			// Setup dummy texture file name to ensure UV coordinates are kept during postprocessing
			aiString szString;
			if (convertedPath.length())	{
				szString.Set(convertedPath);
			}
			else	{
				DefaultLogger::get()->warn("Texture file name has zero length. Using default name");
				szString.Set("dummy_texture.bmp");
			}
			pcHelper->AddProperty(&szString,AI_MATKEY_TEXTURE_DIFFUSE(0));

			// prevent transparency by default
			int no_alpha = aiTextureFlags_IgnoreAlpha;
			pcHelper->AddProperty(&no_alpha,1,AI_MATKEY_TEXFLAGS_DIFFUSE(0));
		}
		else {
			Q3Shader::ConvertShaderToMaterial(pcHelper,*shader);
		}

		pScene->mMaterials[iNumMaterials] = (aiMaterial*)pcHelper;
		pcMesh->mMaterialIndex = iNumMaterials++;

			// Ensure correct endianess
#ifdef AI_BUILD_BIG_ENDIAN

		for (uint32_t i = 0; i < pcSurfaces->NUM_VERTICES;++i)	{
			AI_SWAP2( pcVertices[i].NORMAL );
			AI_SWAP2( pcVertices[i].X );
			AI_SWAP2( pcVertices[i].Y );
			AI_SWAP2( pcVertices[i].Z );

			AI_SWAP4( pcUVs[i].U );
			AI_SWAP4( pcUVs[i].U );
		}
		for (uint32_t i = 0; i < pcSurfaces->NUM_TRIANGLES;++i)	{
			AI_SWAP4(pcTriangles[i].INDEXES[0]);
			AI_SWAP4(pcTriangles[i].INDEXES[1]);
			AI_SWAP4(pcTriangles[i].INDEXES[2]);
		}

#endif

		// Fill mesh information
		pcMesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

		pcMesh->mNumVertices		= pcSurfaces->NUM_TRIANGLES*3;
		pcMesh->mNumFaces			= pcSurfaces->NUM_TRIANGLES;
		pcMesh->mFaces				= new aiFace[pcSurfaces->NUM_TRIANGLES];
		pcMesh->mNormals			= new aiVector3D[pcMesh->mNumVertices];
		pcMesh->mVertices			= new aiVector3D[pcMesh->mNumVertices];
		pcMesh->mTextureCoords[0]	= new aiVector3D[pcMesh->mNumVertices];
		pcMesh->mNumUVComponents[0] = 2;

		// Fill in all triangles
		unsigned int iCurrent = 0;
		for (unsigned int i = 0; i < (unsigned int)pcSurfaces->NUM_TRIANGLES;++i)	{
			pcMesh->mFaces[i].mIndices = new unsigned int[3];
			pcMesh->mFaces[i].mNumIndices = 3;

			//unsigned int iTemp = iCurrent;
			for (unsigned int c = 0; c < 3;++c,++iCurrent)	{
				pcMesh->mFaces[i].mIndices[c] = iCurrent;

				// Read vertices
				aiVector3D& vec = pcMesh->mVertices[iCurrent];
				vec.x = pcVertices[ pcTriangles->INDEXES[c]].X*AI_MD3_XYZ_SCALE;
				vec.y = pcVertices[ pcTriangles->INDEXES[c]].Y*AI_MD3_XYZ_SCALE;
				vec.z = pcVertices[ pcTriangles->INDEXES[c]].Z*AI_MD3_XYZ_SCALE;

				// Convert the normal vector to uncompressed float3 format
				aiVector3D& nor = pcMesh->mNormals[iCurrent];
				LatLngNormalToVec3(pcVertices[pcTriangles->INDEXES[c]].NORMAL,(float*)&nor);

				// Read texture coordinates
				pcMesh->mTextureCoords[0][iCurrent].x = pcUVs[ pcTriangles->INDEXES[c]].U;
				pcMesh->mTextureCoords[0][iCurrent].y = 1.0f-pcUVs[ pcTriangles->INDEXES[c]].V;
			}
			// Flip face order if necessary
			if (!shader || shader->cull == Q3Shader::CULL_CW) {
				std::swap(pcMesh->mFaces[i].mIndices[2],pcMesh->mFaces[i].mIndices[1]);
			}
			pcTriangles++;
		}
	
		// Go to the next surface
		pcSurfaces = (BE_NCONST MD3::Surface*)(((unsigned char*)pcSurfaces) + pcSurfaces->OFS_END);
	}

	// For debugging purposes: check whether we found matches for all entries in the skins file
	if (!DefaultLogger::isNullLogger()) {
		for (std::list< Q3Shader::SkinData::TextureEntry>::const_iterator it = skins.textures.begin();it != skins.textures.end(); ++it) {
			if (!(*it).resolved) {
				DefaultLogger::get()->error("MD3: Failed to match skin " + (*it).first + " to surface " + (*it).second);
			}
		}
	}

	if (!pScene->mNumMeshes)
		throw new ImportErrorException( "MD3: File contains no valid mesh");
	pScene->mNumMaterials = iNumMaterials;

	// Now we need to generate an empty node graph
	pScene->mRootNode = new aiNode("<MD3Root>");
	pScene->mRootNode->mNumMeshes = pScene->mNumMeshes;
	pScene->mRootNode->mMeshes = new unsigned int[pScene->mNumMeshes];

	// Attach tiny children for all tags
	if (pcHeader->NUM_TAGS) {
		pScene->mRootNode->mNumChildren = pcHeader->NUM_TAGS;
		pScene->mRootNode->mChildren = new aiNode*[pcHeader->NUM_TAGS];

		for (unsigned int i = 0; i < pcHeader->NUM_TAGS; ++i, ++pcTags) {

			aiNode* nd = pScene->mRootNode->mChildren[i] = new aiNode();
			nd->mName.Set((const char*)pcTags->NAME);
			nd->mParent = pScene->mRootNode;

			AI_SWAP4(pcTags->origin.x);
			AI_SWAP4(pcTags->origin.y);
			AI_SWAP4(pcTags->origin.z);

			// Copy local origin, again flip z,y
			nd->mTransformation.a4 = pcTags->origin.x;
			nd->mTransformation.b4 = pcTags->origin.y;
			nd->mTransformation.c4 = pcTags->origin.z;

			// Copy rest of transformation (need to transpose to match row-order matrix)
			for (unsigned int a = 0; a < 3;++a) {
				for (unsigned int m = 0; m < 3;++m) {
					nd->mTransformation[m][a] = pcTags->orientation[a][m];
					AI_SWAP4(nd->mTransformation[m][a]);
				}
			}
		}
	}

	for (unsigned int i = 0; i < pScene->mNumMeshes;++i)
		pScene->mRootNode->mMeshes[i] = i;

	// Now rotate the whole scene 90 degrees around the x axis to convert to internal coordinate system
	pScene->mRootNode->mTransformation = aiMatrix4x4(1.f,0.f,0.f,0.f,
		0.f,0.f,1.f,0.f,0.f,-1.f,0.f,0.f,0.f,0.f,0.f,1.f);
}

#endif // !! ASSIMP_BUILD_NO_MD3_IMPORTER