// Copyright (C) 2002-2011 Nikolaus Gebhardt

// This file is part of the "Irrlicht Engine".

// For conditions of distribution and use, see copyright notice in irrlicht.h


#ifndef __C_X_MESH_FILE_LOADER_H_INCLUDED__
#define __C_X_MESH_FILE_LOADER_H_INCLUDED__

#include "IMeshLoader.h"
#include "irrString.h"
#include "CSkinnedMesh.h"


namespace irr
{
namespace io
{
	class IFileSystem;
	class IReadFile;
} // end namespace io

namespace scene
{
class IMeshManipulator;

//! Meshloader capable of loading x meshes.

class CXMeshFileLoader : public IMeshLoader
{
public:

	//! Constructor

	CXMeshFileLoader(scene::ISceneManager* smgr, io::IFileSystem* fs);

	//! returns true if the file maybe is able to be loaded by this class

	//! based on the file extension (e.g. ".cob")

	virtual bool isALoadableFileExtension(const io::path& filename) const;

	//! creates/loads an animated mesh from the file.

	//! \return Pointer to the created mesh. Returns 0 if loading failed.

	//! If you no longer need the mesh, you should call IAnimatedMesh::drop().

	//! See IReferenceCounted::drop() for more information.

	virtual IAnimatedMesh* createMesh(io::IReadFile* file);

	struct SXTemplateMaterial
	{
		core::stringc Name; // template name from Xfile

		video::SMaterial Material; // material

	};

	struct SXMesh
	{
		SXMesh() : MaxSkinWeightsPerVertex(0), MaxSkinWeightsPerFace(0), BoneCount(0),AttachedJointID(-1),HasSkinning(false), HasVertexColors(false) {}
		// this mesh contains triangulated texture data.

		// because in an .x file, faces can be made of more than 3

		// vertices, the indices data structure is triangulated during the

		// loading process. The IndexCountPerFace array is filled during

		// this triangulation process and stores how much indices belong to

		// every face. This data structure can be ignored, because all data

		// in this structure is triangulated.


		core::stringc Name;

		u32 MaxSkinWeightsPerVertex;
		u32 MaxSkinWeightsPerFace;
		u32 BoneCount;

		core::array<u16> IndexCountPerFace; // default 3, but could be more


		core::array<scene::SSkinMeshBuffer*> Buffers;

		core::array<video::S3DVertex> Vertices;
		core::array<core::vector2df> TCoords2;

		core::array<u32> Indices;

		core::array<u32> FaceMaterialIndices; // index of material for each face


		core::array<video::SMaterial> Materials; // material array


		core::array<u32> WeightJoint;
		core::array<u32> WeightNum;

		s32 AttachedJointID;

		bool HasSkinning;
		bool HasVertexColors;
	};

private:

	bool load(io::IReadFile* file);

	bool readFileIntoMemory(io::IReadFile* file);

	bool parseFile();

	bool parseDataObject();

	bool parseDataObjectTemplate();

	bool parseDataObjectFrame(CSkinnedMesh::SJoint *parent);

	bool parseDataObjectTransformationMatrix(core::matrix4 &mat);

	bool parseDataObjectMesh(SXMesh &mesh);

	bool parseDataObjectSkinWeights(SXMesh &mesh);

	bool parseDataObjectSkinMeshHeader(SXMesh &mesh);

	bool parseDataObjectMeshNormals(SXMesh &mesh);

	bool parseDataObjectMeshTextureCoords(SXMesh &mesh);

	bool parseDataObjectMeshVertexColors(SXMesh &mesh);

	bool parseDataObjectMeshMaterialList(SXMesh &mesh);

	bool parseDataObjectMaterial(video::SMaterial& material);

	bool parseDataObjectAnimationSet();

	bool parseDataObjectAnimation();

	bool parseDataObjectAnimationKey(ISkinnedMesh::SJoint *joint);

	bool parseDataObjectTextureFilename(core::stringc& texturename);

	bool parseUnknownDataObject();

	//! places pointer to next begin of a token, and ignores comments

	void findNextNoneWhiteSpace();

	//! places pointer to next begin of a token, which must be a number,

	// and ignores comments

	void findNextNoneWhiteSpaceNumber();

	//! returns next parseable token. Returns empty string if no token there

	core::stringc getNextToken();

	//! reads header of dataobject including the opening brace.

	//! returns false if error happened, and writes name of object

	//! if there is one

	bool readHeadOfDataObject(core::stringc* outname=0);

	//! checks for closing curly brace, returns false if not there

	bool checkForClosingBrace();

	//! checks for one following semicolons, returns false if not there

	bool checkForOneFollowingSemicolons();

	//! checks for two following semicolons, returns false if they are not there

	bool checkForTwoFollowingSemicolons();

	//! reads a x file style string

	bool getNextTokenAsString(core::stringc& out);

	void readUntilEndOfLine();

	u16 readBinWord();
	u32 readBinDWord();
	u32 readInt();
	f32 readFloat();
	bool readVector2(core::vector2df& vec);
	bool readVector3(core::vector3df& vec);
	bool readMatrix(core::matrix4& mat);
	bool readRGB(video::SColor& color);
	bool readRGBA(video::SColor& color);

	ISceneManager* SceneManager;
	io::IFileSystem* FileSystem;

	core::array<CSkinnedMesh::SJoint*> *AllJoints;

	CSkinnedMesh* AnimatedMesh;

	c8* Buffer;
	const c8* P;
	c8* End;
	// counter for number arrays in binary format

	u32 BinaryNumCount;
	u32 Line;
	io::path FilePath;

	CSkinnedMesh::SJoint *CurFrame;

	core::array<SXMesh*> Meshes;

	core::array<SXTemplateMaterial> TemplateMaterials;

	u32 MajorVersion;
	u32 MinorVersion;
	bool BinaryFormat;
	c8 FloatSize;
};

} // end namespace scene

} // end namespace irr


#endif