/*
*
*    This program is free software; you can redistribute it and/or modify it
*    under the terms of the GNU General Public License as published by the
*    Free Software Foundation; either version 2 of the License, or (at
*    your option) any later version.
*
*    This program is distributed in the hope that it will be useful, but
*    WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
*    General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program; if not, write to the Free Software Foundation,
*    Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*    In addition, as a special exception, the author gives permission to
*    link the code of this program with the Half-Life Game Engine ("HL
*    Engine") and Modified Game Libraries ("MODs") developed by Valve,
*    L.L.C ("Valve").  You must obey the GNU General Public License in all
*    respects for all of the code used other than the HL Engine and MODs
*    from Valve.  If you modify this file, you may extend this exception
*    to your version of the file, but you are not obligated to do so.  If
*    you do not wish to do so, delete this exception statement from your
*    version.
*
*/

#pragma once

#include "maintypes.h"

const int DELTA_MAX_FIELDS = 56;	// 7*8

enum
{
	DT_BYTE				= BIT(0),	// A byte
	DT_SHORT			= BIT(1),	// 2 byte field
	DT_FLOAT			= BIT(2),	// A floating point field
	DT_INTEGER			= BIT(3),	// 4 byte integer
	DT_ANGLE			= BIT(4),	// A floating point angle
	DT_TIMEWINDOW_8		= BIT(5),	// A floating point timestamp relative to server time
	DT_TIMEWINDOW_BIG	= BIT(6),	// A floating point timestamp relative to server time (with more precision and custom multiplier)
	DT_STRING			= BIT(7),	// A null terminated string, sent as 8 byte chars
	
	DT_SIGNED			= BIT(31)	// sign modificator
};

const int FDT_MARK = BIT(0);		// Delta mark for sending

typedef struct delta_s delta_t;
typedef void(*encoder_t)(delta_t *, const unsigned char *, const unsigned char *);

typedef struct delta_stats_s
{
	int sendcount;
	int receivedcount;
} delta_stats_t;

typedef struct delta_description_s
{
	int fieldType;
	char fieldName[32];
	int fieldOffset;
	short int fieldSize;
	int significant_bits;
	float premultiply;
	float postmultiply;
	short int flags;
	delta_stats_t stats;
} delta_description_t;

class CDeltaJit;

union delta_marked_mask_t {
	uint8 u8[8];
	uint32 u32[2];
	uint64 u64;
};

typedef struct delta_s
{
	int dynamic;
	int fieldCount;
	char conditionalencodename[32];
	encoder_t conditionalencode;
	delta_description_t *pdd;

#if defined(REHLDS_JIT)
	CDeltaJit* jit;
#elif defined(REHLDS_FIXES)
	delta_marked_mask_t originalMarkedFieldsMask;
#endif
} delta_t;

typedef struct delta_encoder_s delta_encoder_t;

struct delta_encoder_s
{
	delta_encoder_t *next;
	char *name;
	encoder_t conditionalencode;
};

typedef struct delta_link_s delta_link_t;
typedef struct delta_definition_s delta_definition_t;
typedef struct delta_definition_list_s delta_definition_list_t;
typedef struct delta_registry_s delta_registry_t;
typedef struct delta_info_s delta_info_t;

typedef struct delta_info_s
{
	delta_info_s *next;
	char *name;
	char *loadfile;
	delta_t *delta;
} delta_info_t;

#ifdef HOOK_ENGINE
#define g_defs (*pg_defs)
#define g_encoders (*pg_encoders)
#define g_deltaregistry (*pg_deltaregistry)
#endif // HOOK_ENGINE

extern delta_definition_list_t *g_defs;
extern delta_encoder_t *g_encoders;
extern delta_registry_t *g_deltaregistry;
extern delta_t g_MetaDelta[];

delta_description_t *DELTA_FindField(delta_t *pFields, const char *pszField);
int DELTA_FindFieldIndex(struct delta_s *pFields, const char *fieldname);
void DELTA_SetField(struct delta_s *pFields, const char *fieldname);
void DELTA_UnsetField(struct delta_s *pFields, const char *fieldname);
void DELTA_SetFieldByIndex(struct delta_s *pFields, int fieldNumber);
void DELTA_UnsetFieldByIndex(struct delta_s *pFields, int fieldNumber);
void DELTA_ClearFlags(delta_t *pFields);
int DELTA_TestDelta(unsigned char *from, unsigned char *to, delta_t *pFields);
int DELTA_CountSendFields(delta_t *pFields);
void DELTA_MarkSendFields(unsigned char *from, unsigned char *to, delta_t *pFields);
void DELTA_SetSendFlagBits(delta_t *pFields, int *bits, int *bytecount);
qboolean DELTA_IsFieldMarked(delta_t* pFields, int fieldNumber);
void DELTA_WriteMarkedFields(unsigned char *from, unsigned char *to, delta_t *pFields);
qboolean DELTA_CheckDelta(unsigned char *from, unsigned char *to, delta_t *pFields);

#ifdef REHLDS_FIXES //Fix for https://github.com/dreamstalker/rehlds/issues/24
qboolean DELTA_WriteDeltaForceMask(unsigned char *from, unsigned char *to, qboolean force, delta_t *pFields, void(*callback)(void), void* pForceMask);
uint64 DELTA_GetOriginalMask(delta_t* pFields);
uint64 DELTA_GetMaskU64(delta_t* pFields);
#endif

qboolean DELTA_WriteDelta(unsigned char *from, unsigned char *to, qboolean force, delta_t *pFields, void(*callback)(void));
qboolean _DELTA_WriteDelta(unsigned char *from, unsigned char *to, qboolean force, delta_t *pFields, void(*callback)(void), qboolean sendfields);
int DELTA_ParseDelta(unsigned char *from, unsigned char *to, delta_t *pFields);
void DELTA_AddEncoder(const char *name, void(*conditionalencode)(struct delta_s *, const unsigned char *, const unsigned char *));
void DELTA_ClearEncoders(void);
encoder_t DELTA_LookupEncoder(char *name);
int DELTA_CountLinks(delta_link_t *plinks);
void DELTA_ReverseLinks(delta_link_t **plinks);
void DELTA_ClearLinks(delta_link_t **plinks);
delta_t *DELTA_BuildFromLinks(delta_link_t **pplinks);
int DELTA_FindOffset(int count, delta_definition_t *pdef, char *fieldname);
qboolean DELTA_ParseType(delta_description_t *pdelta, char **pstream);
qboolean DELTA_ParseField(int count, delta_definition_t *pdefinition, delta_link_t *pField, char **pstream);
void DELTA_FreeDescription(delta_t **ppdesc);
void DELTA_AddDefinition(char *name, delta_definition_t *pdef, int numelements);
void DELTA_ClearDefinitions(void);
delta_definition_t *DELTA_FindDefinition(char *name, int *count);
void DELTA_SkipDescription(char **pstream);
qboolean DELTA_ParseOneField(char **ppstream, delta_link_t **pplist, int count, delta_definition_t *pdefinition);
qboolean DELTA_ParseDescription(char *name, delta_t **ppdesc, char *pstream);
qboolean DELTA_Load(char *name, delta_t **ppdesc, char *pszFile);
void DELTA_RegisterDescription(char *name);
void DELTA_ClearRegistrations(void);
delta_t **DELTA_LookupRegistration(const char *name);
void DELTA_ClearStats(delta_t *p);
void DELTA_ClearStats_f(void);
void DELTA_PrintStats(const char *name, delta_t *p);
void DELTA_DumpStats_f(void);
void DELTA_Init(void);
void DELTA_Shutdown(void);