/*	==========================================================================
 *	(C) 2005 Universitat Jaume I
 *	==========================================================================
 *	PROYECT:	GAME TOOLS
 *	==========================================================================
 *	CONTENT:	
 *
 *
 *	@file	GeoMeshLoader.h
 *===========================================================================*/
#ifndef __GEO_MESH_LOADER__
#define __GEO_MESH_LOADER__

#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <vector>
#include <memory.h>
#include <time.h>
#include <iostream>
#include <iomanip>
#include "GeoBase.h"
#include "GeoMesh.h"
#include "GeoLodStripsLibrary.h"
#include "GeoLodTreeLibrary.h"

namespace Geometry 
{
	const	unsigned	short	CHUNK_OVERHEAD_SIZE	= sizeof(unsigned short)
																							+
																							sizeof(unsigned long);

	const unsigned	short M_HEADER											= 0x1000;
	const unsigned	short M_MESH												= 0x3000;
	const unsigned	short M_SUBMESH											= 0x4000; 
	const unsigned	short M_SUBMESH_OPERATION						= 0x4010;
	const unsigned	short M_SUBMESH_BONE_ASSIGNMENT			= 0x4100;
	const unsigned	short M_GEOMETRY										= 0x5000;
	const unsigned	short M_GEOMETRY_VERTEX_DECLARATION = 0x5100;
	const unsigned	short M_GEOMETRY_VERTEX_ELEMENT			= 0x5110;
	const unsigned	short M_GEOMETRY_VERTEX_BUFFER			= 0x5200;
	const unsigned	short M_GEOMETRY_VERTEX_BUFFER_DATA = 0x5210;
	const unsigned	short M_MESH_SKELETON_LINK					= 0x6000;
	const unsigned	short M_MESH_BONE_ASSIGNMENT				= 0x7000;
	const unsigned	short M_MESH_LOD										=	0x8000;
	const unsigned	short M_MESH_LOD_USAGE							=	0x8100;
	const unsigned	short M_MESH_LOD_MANUAL							=	0x8110;
	const unsigned	short M_MESH_LOD_GENERATED					=	0x8120;
	const unsigned	short M_MESH_BOUNDS									=	0x9000;
	const unsigned	short M_SUBMESH_NAME_TABLE					=	0xA000;
	const unsigned	short	M_SUBMESH_NAME_TABLE_ELEMENT	=	0xA100;
	const unsigned	short M_EDGE_LISTS									=	0xB000;
	const unsigned	short M_EDGE_LIST_LOD								=	0xB100;
	const unsigned	short M_EDGE_GROUP									= 0xB110;
	const unsigned	short M_POSES												= 0xC000;
	const unsigned	short M_ANIMATIONS									= 0xD000;
	const unsigned	short M_LODSTRIPS										= 0xABCD;
	const unsigned	short M_LODTREES										= 0xDCBA;
	const	unsigned	short	SUBMESH_COUNT									=	0;
	const	unsigned	short	GEOMESH_BUILD									=	1;
	
	enum VertexElementType
	{
		VET_FLOAT1,
		VET_FLOAT2,
		VET_FLOAT3,
		VET_FLOAT4,
		VET_COLOUR,
		VET_SHORT1,
		VET_SHORT2,
		VET_SHORT3,
		VET_SHORT4,
		VET_UBYTE4
	};

	enum VertexElementSemantic
	{
		/// Position, 3 reals per vertex
		VES_POSITION = 1,
		/// Blending weights
		VES_BLEND_WEIGHTS = 2,
		/// Blending indices
		VES_BLEND_INDICES = 3,
		/// Normal, 3 reals per vertex
		VES_NORMAL = 4,
		/// Diffuse colours
		VES_DIFFUSE = 5,
		/// Specular colours
		VES_SPECULAR = 6,
		/// Texture coordinates
		VES_TEXTURE_COORDINATES = 7,
		/// Binormal (Y axis if normal is Z)
		VES_BINORMAL = 8,
		/// Tangent (X axis if normal is Z)
		VES_TANGENT = 9
	};

	/*
	//	Bounding Box data.
	struct	GeometryBounds
	{
		float	minx;
		float	miny;
		float	minz;
		float	maxx;
		float	maxy;
		float	maxz;
		float	radius;
	};
	*/
	
	/// Mesh class interface
	class GEOLODLIBRARYDLL_API GeoMeshLoader
	{
		private:
			
			Mesh		*geoMesh;
			size_t		mFileSize;
			unsigned	int		numVertices;
			unsigned	long	long_actual;
			size_t		currentSubMesh;
			bool		mError;

			struct GeometryElement
			{
				unsigned short offset;
				unsigned short semantic;
				unsigned short type;
				unsigned short index;
			};

			struct GT
			{
				unsigned short source; //bindIndex
				std::vector <GeometryElement> list;
			};

			std::vector <GT> list;

			//	Jump a chunk.
			void jumpChunk(FILE	*f);

			//	Read a chunk.
			unsigned short readChunk(FILE	*f);

			//	Read geometry vertex element.
			void readGeometryVertexElement(FILE	*f, Mesh	*geoMesh);

			//	Read geometry vertex declaration.
			void readGeometryVertexDeclaration(FILE	*f, Mesh	*geoMesh);

			//	Read geometry vertex buffer.
			void readGeometryVertexBuffer(FILE		*f,
																		Mesh		*geoMesh,
																		int 		option);

			//	Read geometry.
			void readGeometry(FILE	*f, Mesh	*geoMesh, int option);

			//	Read a submesh operation.
			void readSubMeshOperation(FILE	*f, Mesh	*geoMesh, int option);

			//	Read a submesh.
			void readSubMesh(FILE	*f, Mesh	*geoMesh, int option);

			//	Read skeleton name.
			void readSkeletonLink(FILE	*f, Mesh	*geoMesh, int option);

			//	Read bone assignment.
			void readMeshBoneAssignment(FILE	*f, Mesh	*geoMesh, int option);

			//	Read bone assignment.
			void readSubMeshBoneAssignment(FILE	*f, SubMesh	*geoSubMesh, int option);

			//	Read a mesh lod information.
			void readMeshLodInfo(FILE	*f, Mesh	*geoMesh);

			//	Read a submesh name table.
			void readSubMeshNameTable(FILE	*f, Mesh	*geoMesh);

			//	Read a mesh file.
			void readMesh(FILE	*f, Mesh	*geoMesh, int option);

			//	Read bounding box settings.
			void	readMeshBounds(FILE	*f, Mesh	*geoMesh,	int	option);

			//	Writes the strips list.
			SubMesh* GeoMeshLoader::BuildStripsGeoSubMesh(SubMesh	*geoSubMesh);

			//	Remove degenerate triangles of a submesh given.
			SubMesh	*	removeDegenerateTriangles(SubMesh	*geoSubMesh);
			
			//	Sets coods between -1 and 1.
			void	normalizeModel(Mesh	*geoMesh);

			// Imports an OBJ object
			void importOBJ(FILE *f, Mesh *geoMesh);

			Geometry::LodStripsLibraryData *lodstripsdata;
			Geometry::TreeSimplificationSequence *treesimpseq;

		public:

			//	Constructor.
			GeoMeshLoader();

			//	Destroyer.
			~GeoMeshLoader();

			//	Loads a Mesh file.
			Mesh* load(char	*fileNameMesh);

			//	Get the size in bytes of the file.
			size_t	getFileSize();

			// if the loaded .mesh file doesn't contain LOD data this will return NULL
			const Geometry::LodStripsLibraryData * GetLodStripsData(void) const { return lodstripsdata; }
			const Geometry::TreeSimplificationSequence * GetTreeSimpSeq(void) const { return treesimpseq; }
	};
}
#endif