/*
Copyright (C) 1997-2001 Id Software, Inc.

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.

*/
#ifndef COMMON_H
#define COMMON_H

// common.h -- definitions common between client and server, but not game.dll

#define	VERSION		3.21

#define BASEDIRNAME	"xash"

#ifdef NDEBUG
#define BUILDSTRING "Win32 RELEASE"
#else
#define BUILDSTRING "Win32 DEBUG"
#endif

// many buffers use this size
#define MAX_INPUTLINE 16384

// shared color tag printing constants
#define STRING_COLOR_TAG			'^'
#define STRING_COLOR_DEFAULT			 7
#define STRING_COLOR_DEFAULT_STR		"^7"

// move to mathlib
#define RAD_TO_STUDIO	(32768.0/M_PI)
#define STUDIO_TO_RAD	(M_PI/32768.0)

size_t strlcpy(char *dst, const char *src, size_t siz);
size_t strlcat(char *dst, const char *src, size_t siz);

//============================================================================

typedef struct sizebuf_s
{
	bool	allowoverflow;	// if false, do a Com_Error
	bool	overflowed;		// set to true if the buffer size failed
	byte	*data;
	int		maxsize;
	int		cursize;
	int		readcount;
} sizebuf_t;

void SZ_Init (sizebuf_t *buf, byte *data, int length);
void SZ_Clear (sizebuf_t *buf);
void *SZ_GetSpace (sizebuf_t *buf, int length);
void SZ_Write (sizebuf_t *buf, void *data, int length);
void SZ_Print (sizebuf_t *buf, char *data);	// strcats onto the sizebuf

//============================================================================

struct usercmd_s;
struct entity_state_s;

void MSG_WriteChar (sizebuf_t *sb, int c);
void MSG_WriteByte (sizebuf_t *sb, int c);
void MSG_WriteShort (sizebuf_t *sb, int c);
void MSG_WriteLong (sizebuf_t *sb, int c);
void MSG_WriteFloat (sizebuf_t *sb, float f);
void MSG_WriteString (sizebuf_t *sb, char *s);
void MSG_WriteCoord (sizebuf_t *sb, float f);
void MSG_WritePos (sizebuf_t *sb, vec3_t pos);
void MSG_WriteAngle (sizebuf_t *sb, float f);
void MSG_WriteAngle16 (sizebuf_t *sb, float f);
void MSG_WriteUnterminatedString (sizebuf_t *sb, const char *s);
void MSG_WriteDeltaUsercmd (sizebuf_t *sb, struct usercmd_s *from, struct usercmd_s *cmd);
void MSG_WriteDeltaEntity (struct entity_state_s *from, struct entity_state_s *to, sizebuf_t *msg, bool force, bool newentity);
void MSG_WriteDir (sizebuf_t *sb, vec3_t vector);
void MSG_WriteVector (sizebuf_t *sb, float *v );

void	MSG_BeginReading (sizebuf_t *sb);

int		MSG_ReadChar (sizebuf_t *sb);
int		MSG_ReadByte (sizebuf_t *sb);
int		MSG_ReadShort (sizebuf_t *sb);
int		MSG_ReadLong (sizebuf_t *sb);
float	MSG_ReadFloat (sizebuf_t *sb);
char	*MSG_ReadString (sizebuf_t *sb);
char	*MSG_ReadStringLine (sizebuf_t *sb);

float	MSG_ReadCoord (sizebuf_t *sb);
void	MSG_ReadPos (sizebuf_t *sb, vec3_t pos);
float	MSG_ReadAngle (sizebuf_t *sb);
float	MSG_ReadAngle16 (sizebuf_t *sb);
void	MSG_ReadDeltaUsercmd (sizebuf_t *sb, struct usercmd_s *from, struct usercmd_s *cmd);

void	MSG_ReadDir (sizebuf_t *sb, vec3_t vector);

void	MSG_ReadData (sizebuf_t *sb, void *buffer, int size);

//============================================================================


int	COM_Argc (void);
char *COM_Argv (int arg);	// range and null checked
void COM_ClearArgv (int arg);
int COM_CheckParm (char *parm);
void COM_AddParm (char *parm);

void COM_Init (void);
void COM_InitArgv (int argc, char **argv);

char *CopyString (char *in);

//============================================================================

void Info_Print (char *s);


/* crc.h */

void CRC_Init(unsigned short *crcvalue);
void CRC_ProcessByte(unsigned short *crcvalue, byte data);
unsigned short CRC_Value(unsigned short crcvalue);
unsigned short CRC_Block (byte *start, int count);



/*
==============================================================

PROTOCOL

==============================================================
*/

// protocol.h -- communications protocols

#define	PROTOCOL_VERSION	34

//=========================================

#define	PORT_MASTER	27900
#define	PORT_CLIENT	27901
#define	PORT_SERVER	27910

//=========================================

#define	UPDATE_BACKUP	16	// copies of entity_state_t to keep buffered
							// must be power of two
#define	UPDATE_MASK		(UPDATE_BACKUP-1)



//==================
// the svc_strings[] array in cl_parse.c should mirror this
//==================

//
// server to client
//
enum svc_ops_e
{
	svc_bad,

	// these ops are known to the game dll
	svc_muzzleflash,
	svc_muzzleflash2,
	svc_temp_entity,
	svc_layout,
	svc_inventory,

	// the rest are private to the client and server
	svc_nop,
	svc_disconnect,
	svc_reconnect,
	svc_sound,					// <see code>
	svc_print,					// [byte] id [string] null terminated string
	svc_stufftext,				// [string] stuffed into client's console buffer, should be \n terminated
	svc_serverdata,				// [long] protocol ...
	svc_configstring,			// [short] [string]
	svc_spawnbaseline,		
	svc_centerprint,			// [string] to put in center of the screen
	svc_download,				// [short] size [size bytes]
	svc_playerinfo,				// variable
	svc_packetentities,			// [...]
	svc_deltapacketentities,	// [...]
	svc_frame,


	//quakeC temp indexes
	svc_spawnstaticsound,
	svc_spawnstaticsound2,	
	svc_spawnstatic,
	svc_spawnstatic2,

	svc_updatestatubyte,
	svc_updatestat,
};

//==============================================

//
// client to server
//
enum clc_ops_e
{
	clc_bad,
	clc_nop, 		
	clc_move,				// [[usercmd_t]
	clc_userinfo,			// [[userinfo string]
	clc_stringcmd			// [string] message
};

//==============================================

// plyer_state_t communication

#define	PS_M_TYPE			(1<<0)
#define	PS_M_ORIGIN		(1<<1)
#define	PS_M_VELOCITY		(1<<2)
#define	PS_M_TIME			(1<<3)
#define	PS_M_FLAGS		(1<<4)
#define	PS_M_GRAVITY		(1<<5)
#define	PS_M_DELTA_ANGLES		(1<<6)
#define	PS_VIEWOFFSET		(1<<7)

#define	PS_VIEWANGLES		(1<<8)
#define	PS_KICKANGLES		(1<<9)
#define	PS_BLEND			(1<<10)
#define	PS_FOV			(1<<11)
#define	PS_WEAPONINDEX		(1<<12)
#define	PS_WEAPONFRAME		(1<<13)
#define	PS_WEAPONSEQUENCE		(1<<14)
#define	PS_WEAPONBODY		(1<<15)

#define	PS_WEAPONSKIN		(1<<16)
#define	PS_RDFLAGS		(1<<17)

//==============================================

// user_cmd_t communication

// ms and light always sent, the others are optional
#define	CM_ANGLE1 	(1<<0)
#define	CM_ANGLE2 	(1<<1)
#define	CM_ANGLE3 	(1<<2)
#define	CM_FORWARD	(1<<3)
#define	CM_SIDE		(1<<4)
#define	CM_UP		(1<<5)
#define	CM_BUTTONS	(1<<6)
#define	CM_IMPULSE	(1<<7)

//==============================================

// a sound without an ent or pos will be a local only sound
#define	SND_VOLUME		(1<<0)		// a byte
#define	SND_ATTENUATION	(1<<1)		// a byte
#define	SND_POS			(1<<2)		// three coordinates
#define	SND_ENT			(1<<3)		// a short 0-2: channel, 3-12: entity
#define	SND_OFFSET		(1<<4)		// a byte, msec offset from frame start

#define DEFAULT_SOUND_PACKET_VOLUME	1.0
#define DEFAULT_SOUND_PACKET_ATTENUATION 1.0

//==============================================

// entity_state_t communication

// try to pack the common update flags into the first byte
#define	U_ORIGIN1		(1<<0)
#define	U_ORIGIN2		(1<<1)
#define	U_ANGLE2		(1<<2)
#define	U_ANGLE3		(1<<3)
#define	U_FRAME8		(1<<4)		// frame is a byte
#define	U_EVENT		(1<<5)
#define	U_REMOVE		(1<<6)		// REMOVE this entity, don't add it
#define	U_MOREBITS1	(1<<7)		// read one additional byte

// second byte
#define	U_NUMBER16	(1<<8)		// NUMBER8 is implicit if not set
#define	U_ORIGIN3		(1<<9)
#define	U_ANGLE1		(1<<10)
#define	U_MODEL		(1<<11)
#define	U_RENDERFX8	(1<<12)		// fullbright, etc
#define	U_EFFECTS8	(1<<14)		// autorotate, trails, etc
#define	U_MOREBITS2	(1<<15)		// read one additional byte

// third byte
#define	U_SKIN8		(1<<16)
#define	U_FRAME16		(1<<17)		// frame is a short
#define	U_RENDERFX16	(1<<18)		// 8 + 16 = 32
#define	U_EFFECTS16	(1<<19)		// 8 + 16 = 32
#define	U_WEAPONMODEL	(1<<20)		// weapons, flags, etc
#define	U_BODY		(1<<21)
#define	U_SEQUENCE	(1<<22)		// animation sequence
#define	U_MOREBITS3	(1<<23)		// read one additional byte

// fourth byte
#define	U_OLDORIGIN	(1<<24)		// FIXME: get rid of this
#define	U_SKIN16		(1<<25)
#define	U_SOUND		(1<<26)
#define	U_SOLID		(1<<27)
#define	U_ALPHA		(1<<28)		//alpha value

extern char com_token[MAX_INPUTLINE];

/*
==============================================================

CMD

Command text buffering and command execution

==============================================================
*/

/*

Any number of commands can be added in a frame, from several different sources.
Most commands come from either keybindings or console line input, but remote
servers can also send across commands and entire text files can be execed.

The + command line options are also added to the command buffer.

The game starts with a Cbuf_AddText ("exec quake.rc\n"); Cbuf_Execute ();

*/

#define	EXEC_NOW	0		// don't return until completed
#define	EXEC_INSERT	1		// insert at current position, but don't run yet
#define	EXEC_APPEND	2		// add to end of the command buffer

void Cbuf_Init (void);
// allocates an initial text buffer that will grow as needed

void Cbuf_AddText (char *text);
// as new commands are generated from the console or keybindings,
// the text is added to the end of the command buffer.

void Cbuf_InsertText (char *text);
// when a command wants to issue other commands immediately, the text is
// inserted at the beginning of the buffer, before any remaining unexecuted
// commands.

void Cbuf_ExecuteText (int exec_when, char *text);
// this can be used in place of either Cbuf_AddText or Cbuf_InsertText

void Cbuf_AddEarlyCommands (bool clear);
// adds all the +set commands from the command line

bool Cbuf_AddLateCommands (void);
// adds all the remaining + commands from the command line
// Returns true if any late commands were added, which
// will keep the demoloop from immediately starting

void Cbuf_Execute (void);
// Pulls off \n terminated lines of text from the command buffer and sends
// them through Cmd_ExecuteString.  Stops when the buffer is empty.
// Normally called once per frame, but may be explicitly invoked.
// Do not call inside a command function!

void Cbuf_CopyToDefer (void);
void Cbuf_InsertFromDefer (void);
// These two functions are used to defer any pending commands while a map
// is being loaded

//===========================================================================

/*

Command execution takes a null terminated string, breaks it into tokens,
then searches for a command or variable that matches the first token.

*/

typedef void (*xcommand_t) (void);

void	Cmd_Init (void);

void	Cmd_AddCommand (char *cmd_name, xcommand_t function);
// called by the init functions of other parts of the program to
// register commands and functions to call for them.
// The cmd_name is referenced later, so it should not be in temp memory
// if function is NULL, the command will be forwarded to the server
// as a clc_stringcmd instead of executed locally
void	Cmd_RemoveCommand (char *cmd_name);

bool Cmd_Exists (char *cmd_name);
// used by the cvar code to check for cvar / command name overlap

char 	*Cmd_CompleteCommand (char *partial);
// attempts to match a partial command for automatic command line completion
// returns NULL if nothing fits

int		Cmd_Argc (void);
char	*Cmd_Argv (int arg);
char	*Cmd_Args (void);
// The functions that execute commands get their parameters with these
// functions. Cmd_Argv () will return an empty string, not a NULL
// if arg > argc, so string operations are always safe.

void	Cmd_TokenizeString (char *text, bool macroExpand);
// Takes a null terminated string.  Does not need to be /n terminated.
// breaks the string up into arg tokens.

void	Cmd_ExecuteString (char *text);
// Parses a single line of text into arguments and tries to execute it
// as if it was typed at the console

void	Cmd_ForwardToServer (void);
// adds the current command line as a clc_stringcmd to the client message.
// things like godmode, noclip, etc, are commands directed to the server,
// so when they are typed in at the console, they will need to be forwarded.

/*
==============================================================

NET

==============================================================
*/

// net.h -- quake's interface to the networking layer

#define	PORT_ANY	-1

#define	MAX_MSGLEN		1400		// max length of a message
#define	PACKET_HEADER	10			// two ints and a short

typedef enum {NA_LOOPBACK, NA_BROADCAST, NA_IP, NA_IPX, NA_BROADCAST_IPX} netadrtype_t;

typedef enum {NS_CLIENT, NS_SERVER} netsrc_t;

typedef struct
{
	netadrtype_t	type;

	byte	ip[4];
	byte	ipx[10];

	unsigned short	port;
} netadr_t;

void		NET_Init (void);
void		NET_Shutdown (void);

void		NET_Config (bool multiplayer);

bool	NET_GetPacket (netsrc_t sock, netadr_t *net_from, sizebuf_t *net_message);
void		NET_SendPacket (netsrc_t sock, int length, void *data, netadr_t to);

bool	NET_CompareAdr (netadr_t a, netadr_t b);
bool	NET_CompareBaseAdr (netadr_t a, netadr_t b);
bool	NET_IsLocalAddress (netadr_t adr);
char		*NET_AdrToString (netadr_t a);
bool	NET_StringToAdr (char *s, netadr_t *a);
void		NET_Sleep(int msec);

//============================================================================

#define	OLD_AVG		0.99		// total = oldtotal*OLD_AVG + new*(1-OLD_AVG)

#define	MAX_LATENT	32

typedef struct
{
	bool	fatal_error;

	netsrc_t	sock;

	int			dropped;			// between last packet and previous

	int			last_received;		// for timeouts
	int			last_sent;			// for retransmits

	netadr_t	remote_address;
	int			qport;				// qport value to write when transmitting

// sequencing variables
	int			incoming_sequence;
	int			incoming_acknowledged;
	int			incoming_reliable_acknowledged;	// single bit

	int			incoming_reliable_sequence;		// single bit, maintained local

	int			outgoing_sequence;
	int			reliable_sequence;			// single bit
	int			last_reliable_sequence;		// sequence number of last send

// reliable staging and holding areas
	sizebuf_t	message;		// writing buffer to send to server
	byte		message_buf[MAX_MSGLEN-16];		// leave space for header

// message is copied to this buffer when it is first transfered
	int			reliable_length;
	byte		reliable_buf[MAX_MSGLEN-16];	// unacked reliable message
} netchan_t;

extern	netadr_t	net_from;
extern	sizebuf_t	net_message;
extern	byte		net_message_buffer[MAX_MSGLEN];


void Netchan_Init (void);
void Netchan_Setup (netsrc_t sock, netchan_t *chan, netadr_t adr, int qport);

bool Netchan_NeedReliable (netchan_t *chan);
void Netchan_Transmit (netchan_t *chan, int length, byte *data);
void Netchan_OutOfBand (int net_socket, netadr_t adr, int length, byte *data);
void Netchan_OutOfBandPrint (int net_socket, netadr_t adr, char *format, ...);
bool Netchan_Process (netchan_t *chan, sizebuf_t *msg);

bool Netchan_CanReliable (netchan_t *chan);


/*
==============================================================

CMODEL

==============================================================
*/

cmodel_t	*CM_LoadMap (char *name, bool clientload, unsigned *checksum);
cmodel_t	*CM_InlineModel (char *name);	// *1, *2, etc
stmodel_t	*CM_StudioModel (char *name); //studio models server copy
stmodel_t	*CM_SpriteModel (char *name); //sprite models some info (minmaxs, numframes e.t.c)

extern byte portalopen[MAX_MAP_AREAPORTALS];

int	CM_NumClusters (void);
int	CM_NumInlineModels (void);
char	*CM_EntityString (void);

// creates a clipping hull for an arbitrary box
int CM_HeadnodeForBox (vec3_t mins, vec3_t maxs);


// returns an ORed contents mask
int CM_PointContents (vec3_t p, int headnode);
int CM_TransformedPointContents (vec3_t p, int headnode, vec3_t origin, vec3_t angles);

trace_t	CM_BoxTrace (vec3_t start, vec3_t end, vec3_t mins, vec3_t maxs, int headnode, int brushmask);
trace_t	CM_TransformedBoxTrace (vec3_t start, vec3_t end, vec3_t mins, vec3_t maxs, int headnode, int brushmask, vec3_t origin, vec3_t angles);

byte	*CM_ClusterPVS (int cluster);
byte	*CM_ClusterPHS (int cluster);

int	CM_PointLeafnum (vec3_t p);

// call with topnode set to the headnode, returns with topnode
// set to the first node that splits the box
int	CM_BoxLeafnums (vec3_t mins, vec3_t maxs, int *list, int listsize, int *topnode);

int	CM_LeafContents (int leafnum);
int	CM_LeafCluster (int leafnum);
int	CM_LeafArea (int leafnum);

void	CM_SetAreaPortalState (int portalnum, bool open);
bool	CM_AreasConnected (int area1, int area2);

int	CM_WriteAreaBits (byte *buffer, int area);
bool	CM_HeadnodeVisible (int headnode, byte *visbits);

void	CM_InitBoxHull (void);
void	CM_FloodAreaConnections (void);

/*
==============================================================

PLAYER MOVEMENT CODE

Common between server and client so prediction matches

==============================================================
*/

extern float pm_airaccelerate;

void Pmove (pmove_t *pmove);

/*
==============================================================

MISC

==============================================================
*/


#define	ERR_FATAL	0		// exit the entire game with a popup window
#define	ERR_DROP	1		// print to console and disconnect from game
#define	ERR_QUIT	2		// not an error, just a normal exit

#define	EXEC_NOW	0		// don't return until completed
#define	EXEC_INSERT	1		// insert at current position, but don't run yet
#define	EXEC_APPEND	2		// add to end of the command buffer

#define	PRINT_ALL		0
#define PRINT_DEVELOPER	1	// only print when "developer 1"

void		Com_BeginRedirect (int target, char *buffer, int buffersize, void (*flush));
void		Com_EndRedirect (void);
void 		Com_Printf (char *fmt, ...);
void 		Com_DPrintf (char *fmt, ...);
void 		Com_Error (int code, char *fmt, ...);
void		Com_Error_f ( void );
void 		Com_Quit (void);

int			Com_ServerState (void);		// this should have just been a cvar...
void		Com_SetServerState (int state);

unsigned	Com_BlockChecksum (void *buffer, int length);
byte		COM_BlockSequenceCRCByte (byte *base, int length, int sequence);

float	frand(void);	// 0 ti 1
float	crand(void);	// -1 to 1

extern	cvar_t	*developer;
extern	cvar_t	*dedicated;
extern	cvar_t	*host_speeds;
extern	cvar_t	*log_stats;

extern	file_t *log_stats_file;

// host_speeds times
extern	int		time_before_game;
extern	int		time_after_game;
extern	int		time_before_ref;
extern	int		time_after_ref;

#define NUMVERTEXNORMALS	162
extern	vec3_t	bytedirs[NUMVERTEXNORMALS];

// this is in the client code, but can be used for debugging from server
void SCR_DebugGraph (float value, int color);


/*
==============================================================

NON-PORTABLE SYSTEM SERVICES

==============================================================
*/

void	Sys_Init (void);
void	Sys_Print(const char *pMsg);
void	Sys_AppActivate (void);

void	Sys_UnloadGame (void);
void	*Sys_GetGameAPI (const char* procname, void *parms);
// loads the game dll and calls the api init function

void	Sys_CreateConsole( void );
char	*Sys_ConsoleInput (void);
void	Sys_SendKeyEvents (void);
void	Sys_Quit (void);
char	*Sys_GetClipboardData( void );

/*
==============================================================

CLIENT / SERVER SYSTEMS

==============================================================
*/

void CL_Init (void);
void CL_Drop (void);
void CL_Shutdown (void);
void CL_Frame (int msec);
void Con_Print (char *text);
void SCR_BeginLoadingPlaque (void);

void SV_Init (void);
void SV_Shutdown (char *finalmsg, bool reconnect);
void SV_Frame (int msec);

#endif//COMMON_H