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

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All rights reserved.

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with or without modification, are permitted provided that the 
following conditions are met:

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  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
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* Neither the name of the assimp team, nor the names of its
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  written permission of the assimp team.

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"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,
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*/

/** @file Declaration of the LWO importer class. */
#ifndef AI_LWOLOADER_H_INCLUDED
#define AI_LWOLOADER_H_INCLUDED

#include "../include/assimp/types.h"
#include "../include/assimp/DefaultLogger.hpp"

#include "LWOFileData.h"
#include "BaseImporter.h"

struct aiTexture;
struct aiNode;

namespace Assimp	{
using namespace LWO;

// ---------------------------------------------------------------------------
/** Class to load LWO files.
 *
 *  @note  Methods named "xxxLWO2[xxx]" are used with the newer LWO2 format.
 *         Methods named "xxxLWOB[xxx]" are used with the older LWOB format.
 *         Methods named "xxxLWO[xxx]" are used with both formats.
 *         Methods named "xxx" are used to preprocess the loaded data -
 *         they aren't specific to one format version
*/
// ---------------------------------------------------------------------------
class LWOImporter : public BaseImporter
{
public:
	LWOImporter();
	~LWOImporter();


public:

	// -------------------------------------------------------------------
	/** Returns whether the class can handle the format of the given file. 
	 * See BaseImporter::CanRead() for details.	
	 */
	bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
		bool checkSig) const;


	// -------------------------------------------------------------------
	/** Called prior to ReadFile().
	* The function is a request to the importer to update its configuration
	* basing on the Importer's configuration property list.
	*/
	void SetupProperties(const Importer* pImp);

protected:

	// -------------------------------------------------------------------
	// Get list of supported extensions
	const aiImporterDesc* GetInfo () const;

	// -------------------------------------------------------------------
	/** Imports the given file into the given scene structure. 
	* See BaseImporter::InternReadFile() for details
	*/
	void InternReadFile( const std::string& pFile, aiScene* pScene, 
		IOSystem* pIOHandler);

private:

	// -------------------------------------------------------------------
	/** Loads a LWO file in the older LWOB format (LW < 6)
	 */
	void LoadLWOBFile();

	// -------------------------------------------------------------------
	/** Loads a LWO file in the newer LWO2 format (LW >= 6)
	 */
	void LoadLWO2File();


	// -------------------------------------------------------------------
	/** Parsing functions used for all file format versions
	*/
	inline void GetS0(std::string& out,unsigned int max);
	inline float GetF4();
	inline uint32_t GetU4();
	inline uint16_t GetU2();
	inline uint8_t  GetU1();


	// -------------------------------------------------------------------
	/** Loads a surface chunk from an LWOB file
	 *  @param size Maximum size to be read, in bytes.  
	 */
	void LoadLWOBSurface(unsigned int size);

	// -------------------------------------------------------------------
	/** Loads a surface chunk from an LWO2 file
	 *  @param size Maximum size to be read, in bytes.  
	 */
	void LoadLWO2Surface(unsigned int size);

	// -------------------------------------------------------------------
	/** Loads a texture block from a LWO2 file.
	 *  @param size Maximum size to be read, in bytes.  
	 *  @param head Header of the SUF.BLOK header
	 */
	void LoadLWO2TextureBlock(LE_NCONST IFF::SubChunkHeader* head,
		unsigned int size );

	// -------------------------------------------------------------------
	/** Loads a shader block from a LWO2 file.
	 *  @param size Maximum size to be read, in bytes.  
	 *  @param head Header of the SUF.BLOK header
	 */
	void LoadLWO2ShaderBlock(LE_NCONST IFF::SubChunkHeader* head,
		unsigned int size );

	// -------------------------------------------------------------------
	/** Loads an image map from a LWO2 file
	 *  @param size Maximum size to be read, in bytes.  
	 *  @param tex Texture object to be filled
	 */
	void LoadLWO2ImageMap(unsigned int size, LWO::Texture& tex );
	void LoadLWO2Gradient(unsigned int size, LWO::Texture& tex );
	void LoadLWO2Procedural(unsigned int size, LWO::Texture& tex );

	// loads the header - used by thethree functions above
	void LoadLWO2TextureHeader(unsigned int size, LWO::Texture& tex );

	// -------------------------------------------------------------------
	/** Loads the LWO tag list from the file
	 *  @param size Maximum size to be read, in bytes.  
	 */
	void LoadLWOTags(unsigned int size);

	// -------------------------------------------------------------------
	/** Load polygons from a POLS chunk
	 *  @param length Size of the chunk
	*/
	void LoadLWO2Polygons(unsigned int length);
	void LoadLWOBPolygons(unsigned int length);

	// -------------------------------------------------------------------
	/** Load polygon tags from a PTAG chunk
	 *  @param length Size of the chunk
	*/
	void LoadLWO2PolygonTags(unsigned int length);

	// -------------------------------------------------------------------
	/** Load a vertex map from a VMAP/VMAD chunk
	 *  @param length Size of the chunk
	 *  @param perPoly Operate on per-polygon base?
	*/
	void LoadLWO2VertexMap(unsigned int length, bool perPoly);

	// -------------------------------------------------------------------
	/** Load polygons from a PNTS chunk
	 *  @param length Size of the chunk
	*/
	void LoadLWOPoints(unsigned int length);

	// -------------------------------------------------------------------
	/** Load a clip from a CLIP chunk
	 *  @param length Size of the chunk
	*/
	void LoadLWO2Clip(unsigned int length);

	// -------------------------------------------------------------------
	/** Load an envelope from an EVL chunk
	 *  @param length Size of the chunk
	*/
	void LoadLWO2Envelope(unsigned int length);

	// -------------------------------------------------------------------
	/** Count vertices and faces in a LWOB/LWO2 file
	*/
	void CountVertsAndFacesLWO2(unsigned int& verts, 
		unsigned int& faces,
		uint16_t*& cursor, 
		const uint16_t* const end,
		unsigned int max = UINT_MAX);

	void CountVertsAndFacesLWOB(unsigned int& verts, 
		unsigned int& faces,
		LE_NCONST uint16_t*& cursor, 
		const uint16_t* const end,
		unsigned int max = UINT_MAX);

	// -------------------------------------------------------------------
	/** Read vertices and faces in a LWOB/LWO2 file
	*/
	void CopyFaceIndicesLWO2(LWO::FaceList::iterator& it,
		uint16_t*& cursor, 
		const uint16_t* const end);

	// -------------------------------------------------------------------
	void CopyFaceIndicesLWOB(LWO::FaceList::iterator& it,
		LE_NCONST uint16_t*& cursor, 
		const uint16_t* const end, 
		unsigned int max = UINT_MAX);

	// -------------------------------------------------------------------
	/** Resolve the tag and surface lists that have been loaded.
	*   Generates the mMapping table.
	*/
	void ResolveTags();

	// -------------------------------------------------------------------
	/** Resolve the clip list that has been loaded.
	*   Replaces clip references with real clips.
	*/
	void ResolveClips();

	// -------------------------------------------------------------------
	/** Add a texture list to an output material description.
	 *
	 *  @param pcMat Output material
	 *  @param in Input texture list
	 *  @param type Type identifier of the texture list
	*/
	bool HandleTextures(aiMaterial* pcMat, const TextureList& in,
		aiTextureType type);

	// -------------------------------------------------------------------
	/** Adjust a texture path
	*/
	void AdjustTexturePath(std::string& out);

	// -------------------------------------------------------------------
	/** Convert a LWO surface description to an ASSIMP material
	*/
	void ConvertMaterial(const LWO::Surface& surf,aiMaterial* pcMat);

	
	// -------------------------------------------------------------------
	/** Get a list of all UV/VC channels required by a specific surface.
	 *
	 *  @param surf Working surface
	 *  @param layer Working layer
	 *  @param out Output list. The members are indices into the 
	 *    UV/VC channel lists of the layer
	*/
	void FindUVChannels(/*const*/ LWO::Surface& surf, 
		LWO::SortedRep& sorted,
		/*const*/ LWO::Layer& layer,
		unsigned int out[AI_MAX_NUMBER_OF_TEXTURECOORDS]);

	// -------------------------------------------------------------------
	char FindUVChannels(LWO::TextureList& list,
		LWO::Layer& layer,LWO::UVChannel& uv, unsigned int next);

	// -------------------------------------------------------------------
	void FindVCChannels(const LWO::Surface& surf, 
		LWO::SortedRep& sorted,  
		const LWO::Layer& layer,
		unsigned int out[AI_MAX_NUMBER_OF_COLOR_SETS]);

	// -------------------------------------------------------------------
	/** Generate the final node graph
	 *  Unused nodes are deleted.
	 *  @param apcNodes Flat list of nodes
	*/
	void GenerateNodeGraph(std::map<uint16_t,aiNode*>& apcNodes);

	// -------------------------------------------------------------------
	/** Add children to a node
	 *  @param node Node to become a father
	 *  @param parent Index of the node
	 *  @param apcNodes Flat list of nodes - used nodes are set to NULL.
	*/
	void AddChildren(aiNode* node, uint16_t parent, 
		std::vector<aiNode*>& apcNodes);

	// -------------------------------------------------------------------
	/** Read a variable sized integer
	 *  @param inout Input and output buffer
	*/
	int ReadVSizedIntLWO2(uint8_t*& inout);

	// -------------------------------------------------------------------
	/** Assign a value from a VMAP to a vertex and all vertices 
	 *  attached to it.
	 *  @param base VMAP destination data
	 *  @param numRead Number of float's to be read
	 *  @param idx Absolute index of the first vertex
	 *  @param data Value of the VMAP to be assigned - read numRead
	 *    floats from this array.
	*/
	void DoRecursiveVMAPAssignment(VMapEntry* base, unsigned int numRead, 
		unsigned int idx, float* data);

	// -------------------------------------------------------------------
	/** Compute normal vectors for a mesh
	 *  @param mesh Input mesh
	 *  @param smoothingGroups Smoothing-groups-per-face array
	 *  @param surface Surface for the mesh 
	*/
	void ComputeNormals(aiMesh* mesh, const std::vector<unsigned int>& smoothingGroups,
		const LWO::Surface& surface);


	// -------------------------------------------------------------------
	/** Setup a new texture after the corresponding chunk was 
	 *  encountered in the file.
	 *  @param list Texture list
	 *  @param size Maximum number of bytes to be read
	 *  @return Pointer to new texture
	*/
	LWO::Texture* SetupNewTextureLWOB(LWO::TextureList& list,
		unsigned int size);

protected:

	/** true if the file is a LWO2 file*/
	bool mIsLWO2;

	/** true if the file is a LXOB file*/
	bool mIsLXOB;

	/** Temporary list of layers from the file */
	LayerList* mLayers;

	/** Pointer to the current layer */
	LWO::Layer* mCurLayer;

	/** Temporary tag list from the file */
	TagList* mTags;

	/** Mapping table to convert from tag to surface indices.
	    UINT_MAX indicates that a no corresponding surface is available */
	TagMappingTable* mMapping;

	/** Temporary surface list from the file */
	SurfaceList* mSurfaces;

	/** Temporary clip list from the file */
	ClipList mClips;

	/** Temporary envelope list from the file */
	EnvelopeList mEnvelopes;

	/** file buffer */
	uint8_t* mFileBuffer;

	/** Size of the file, in bytes */
	unsigned int fileSize;

	/** Output scene */
	aiScene* pScene;

	/** Configuration option: speed flag set? */
	bool configSpeedFlag;

	/** Configuration option: index of layer to be loaded */
	unsigned int configLayerIndex;

	/** Configuration option: name of layer to be loaded */
	std::string  configLayerName;

	/** True if we have a named layer */
	bool hasNamedLayer;
};


// ------------------------------------------------------------------------------------------------
inline float LWOImporter::GetF4()
{
	float f = *((float*)mFileBuffer);mFileBuffer += 4;
	AI_LSWAP4(f);
	return f;
}

// ------------------------------------------------------------------------------------------------
inline uint32_t LWOImporter::GetU4()
{
	uint32_t f = *((uint32_t*)mFileBuffer);mFileBuffer += 4;
	AI_LSWAP4(f);
	return f;
}

// ------------------------------------------------------------------------------------------------
inline uint16_t LWOImporter::GetU2()
{
	uint16_t f = *((uint16_t*)mFileBuffer);mFileBuffer += 2;
	AI_LSWAP2(f);
	return f;
}

// ------------------------------------------------------------------------------------------------
inline uint8_t LWOImporter::GetU1()
{
	return *mFileBuffer++;
}

// ------------------------------------------------------------------------------------------------
inline int LWOImporter::ReadVSizedIntLWO2(uint8_t*& inout)
{
	int i;
	int c = *inout;inout++;
	if(c != 0xFF)
	{
		i = c << 8;
		c = *inout;inout++;
		i |= c;
	}
	else
	{
		c = *inout;inout++;
		i = c << 16;
		c = *inout;inout++;
		i |= c << 8;
		c = *inout;inout++;
		i |= c;
	}
	return i;
}

// ------------------------------------------------------------------------------------------------
inline void LWOImporter::GetS0(std::string& out,unsigned int max)
{
	unsigned int iCursor = 0;
	const char*sz = (const char*)mFileBuffer;
	while (*mFileBuffer)
	{
		if (++iCursor > max)
		{
			DefaultLogger::get()->warn("LWO: Invalid file, string is is too long");
			break;
		}
		++mFileBuffer;
	}
	size_t len = (size_t) ((const char*)mFileBuffer-sz);
	out = std::string(sz,len);
	mFileBuffer += (len&0x1 ? 1 : 2);
}



} // end of namespace Assimp

#endif // AI_LWOIMPORTER_H_INCLUDED
