/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2010-2014 QuakeSpasm developers

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 _QUAKE_PROGS_H
#define _QUAKE_PROGS_H

#include "pr_comp.h"	/* defs shared with qcc */
#include "progdefs.h"	/* generated by program cdefs */

typedef union eval_s
{
	string_t	string;
	float		_float;
	float		vector[3];
	func_t		function;
	int		_int;
	int		edict;
} eval_t;

#define	MAX_ENT_LEAFS	32
typedef struct edict_s
{
	qboolean	free;
	link_t		area;			/* linked to a division node or leaf */

	unsigned int		num_leafs;
	int		leafnums[MAX_ENT_LEAFS];

	entity_state_t	baseline;
	unsigned char	alpha;			/* johnfitz -- hack to support alpha since it's not part of entvars_t */
	qboolean	sendinterval;		/* johnfitz -- send time until nextthink to client for better lerp timing */
	qboolean	onladder;			/* spike -- content_ladder stuff */

	float		freetime;		/* sv.time when the object was freed */
	entvars_t	v;			/* C exported fields from progs */

	/* other fields from progs come immediately after */
} edict_t;

#define	EDICT_FROM_AREA(l)	STRUCT_FROM_LINK(l,edict_t,area)

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

typedef void (*builtin_t) (void);
typedef struct qcvm_s qcvm_t;

void PR_Init (void);

void PR_ExecuteProgram (func_t fnum);
void PR_ClearProgs(qcvm_t *vm);
qboolean PR_LoadProgs (const char *filename, qboolean fatal, builtin_t *builtins, size_t numbuiltins);

//from pr_ext.c
void PR_InitExtensions(void);
void PR_EnableExtensions(ddef_t *pr_globaldefs);	//adds in the extra builtins etc
void PR_AutoCvarChanged(cvar_t *var);				//updates the autocvar_ globals when their cvar is changed
void PR_ShutdownExtensions(void);					//nooooes!
void PR_ReloadPics(qboolean purge);					//for gamedir or video changes
func_t PR_FindExtFunction(const char *entryname);
void PR_DumpPlatform_f(void);						//console command: writes out a qsextensions.qc file
//special hacks...
int PF_SV_ForceParticlePrecache(const char *s);
int SV_Precache_Model(const char *s);
int SV_Precache_Sound(const char *s);
void PR_spawnfunc_misc_model(edict_t *self);

//from pr_edict, for pr_ext. reflection is messy.
qboolean	ED_ParseEpair (void *base, ddef_t *key, const char *s);
const char *PR_UglyValueString (int type, eval_t *val);
ddef_t *ED_FindField (const char *name);
ddef_t *ED_FindGlobal (const char *name);
dfunction_t *ED_FindFunction (const char *fn_name);

const char *PR_GetString (int num);
int PR_SetEngineString (const char *s);
int PR_AllocString (int bufferlength, char **ptr);
void PR_ClearEngineString(int num);

void PR_Profile_f (void);

edict_t *ED_Alloc (void);
void ED_Free (edict_t *ed);

void ED_Print (edict_t *ed);
void ED_Write (FILE *f, edict_t *ed);
const char *ED_ParseEdict (const char *data, edict_t *ent);

void ED_WriteGlobals (FILE *f);
const char *ED_ParseGlobals (const char *data);

void ED_LoadFromFile (const char *data);

/*
#define EDICT_NUM(n)		((edict_t *)(sv.edicts+ (n)*pr_edict_size))
#define NUM_FOR_EDICT(e)	(((byte *)(e) - sv.edicts) / pr_edict_size)
*/
edict_t *EDICT_NUM(int n);
int NUM_FOR_EDICT(edict_t *e);

#define	NEXT_EDICT(e)		((edict_t *)( (byte *)e + qcvm->edict_size))

#define	EDICT_TO_PROG(e)	((byte *)e - (byte *)qcvm->edicts)
#define PROG_TO_EDICT(e)	((edict_t *)((byte *)qcvm->edicts + e))

#define	G_FLOAT(o)		(qcvm->globals[o])
#define	G_INT(o)		(*(int *)&qcvm->globals[o])
#define	G_EDICT(o)		((edict_t *)((byte *)qcvm->edicts+ *(int *)&qcvm->globals[o]))
#define G_EDICTNUM(o)		NUM_FOR_EDICT(G_EDICT(o))
#define	G_VECTOR(o)		(&qcvm->globals[o])
#define	G_STRING(o)		(PR_GetString(*(string_t *)&qcvm->globals[o]))
#define	G_FUNCTION(o)		(*(func_t *)&qcvm->globals[o])

#define G_VECTORSET(r,x,y,z) do{G_FLOAT((r)+0) = x; G_FLOAT((r)+1) = y;G_FLOAT((r)+2) = z;}while(0)

#define	E_FLOAT(e,o)		(((float*)&e->v)[o])
#define	E_INT(e,o)		(*(int *)&((float*)&e->v)[o])
#define	E_VECTOR(e,o)		(&((float*)&e->v)[o])
#define	E_STRING(e,o)		(PR_GetString(*(string_t *)&((float*)&e->v)[o]))

extern	int		type_size[8];

FUNC_NORETURN void PR_RunError (const char *error, ...) FUNC_PRINTF(1,2);
#ifdef __WATCOMC__
#pragma aux PR_RunError aborts;
#endif

void ED_PrintEdicts (void);
void ED_PrintNum (int ent);

eval_t *GetEdictFieldValue(edict_t *ed, int fldofs);	//handles invalid offsets with a null
int ED_FindFieldOffset (const char *name);


//from pr_cmds, no longer static so that pr_ext can use them.
sizebuf_t *WriteDest (void);
char *PR_GetTempString (void);
int PR_MakeTempString (const char *val);
char *PF_VarString (int	first);
#define	STRINGTEMP_BUFFERS		1024
#define	STRINGTEMP_LENGTH		1024
void PF_Fixme(void);	//the 'unimplemented' builtin. woot.

struct pr_extfuncs_s
{	//various global qc entry points that might be called by the engine, if set.
	func_t		EndFrame;
	func_t		SV_ParseClientCommand;

	//csqc-specific entry points
	func_t		CSQC_Init;
	func_t		CSQC_DrawHud;		//for the simple hud-only csqc interface.
	func_t		CSQC_DrawScores;	//(optional) for the simple hud-only csqc interface.
	func_t		CSQC_InputEvent;
	func_t		CSQC_ConsoleCommand;
	func_t		CSQC_Parse_Event;
	func_t		CSQC_Parse_Damage;
	//todo...
//	func_t		CSQC_Parse_CenterPrint;
//	func_t		CSQC_Parse_Print;

//	func_t		CSQC_Parse_TempEntity;	//evil... This is the bane of all protocol compatibility. Die.
//	func_t		CSQC_Parse_StuffCmd; //not in simple. Too easy to make cheats by ignoring server messages.
};
extern	cvar_t	pr_checkextension;	//if 0, extensions are disabled (unless they'd be fatal, but they're still spammy)

struct pr_extglobals_s
{
	//csqc-specific globals...
	float	*cltime;
	float	*maxclients;
	float	*intermission;
	float	*intermission_time;
	float	*player_localnum;
	float	*player_localentnum;

	//float	*clientcommandframe;	//we don't have prediction.
	//float	*servercommandframe;	//we don't have prediction.
};

struct pr_extfields_s
{	//various fields that might be wanted by the engine. -1 == invalid
	//I should probably use preprocessor magic for this list or something
	int		items2;				//float
	int		gravity;			//float
	int		alpha;				//float
	int		movement;			//vector
	int		viewmodelforclient;	//entity
	int		exteriormodeltoclient;	//entity
	int		traileffectnum;		//float
	int		emiteffectnum;		//float
	int		scale;				//float
	int		colormod;			//vector
	int		tag_entity;			//entity
	int		tag_index;			//float
	int		button3;			//float
	int		button4;			//float
	int		button5;			//float
	int		button6;			//float
	int		button7;			//float
	int		button8;			//float
	int		viewzoom;			//float
	int		modelflags;			//float, the upper 8 bits of .effects
	//REMEMBER TO ADD THESE TO qsextensions.qc AND pr_edict.c
};

typedef struct
{
	int		s;
	dfunction_t	*f;
} prstack_t;


typedef struct areanode_s
{
	int		axis;		// -1 = leaf node
	float	dist;
	struct areanode_s	*children[2];
	link_t	trigger_edicts;
	link_t	solid_edicts;
} areanode_t;
#define	AREA_DEPTH	4
#define	AREA_NODES	32

#define CSIE_KEYDOWN			0
#define CSIE_KEYUP				1
#define CSIE_MOUSEDELTA			2
#define CSIE_MOUSEABS			3
//#define CSIE_ACCELEROMETER	4
//#define CSIE_FOCUS			5
#define CSIE_JOYAXIS			6
//#define CSIE_GYROSCOPE		7

struct qcvm_s
{
	dprograms_t	*progs;
	dfunction_t	*functions;
	dstatement_t	*statements;
	float		*globals;	/* same as pr_global_struct */
	ddef_t		*fielddefs;	//yay reflection.

	int			edict_size;	/* in bytes */

	builtin_t	builtins[1024];
	int			numbuiltins;

	int			argc;

	qboolean	trace;
	dfunction_t	*xfunction;
	int			xstatement;

	unsigned short	crc;

	struct pr_extglobals_s extglobals;
	struct pr_extfuncs_s extfuncs;
	struct pr_extfields_s extfields;

	//was static inside pr_edict
	char		*strings;
	int			stringssize;
	const char	**knownstrings;
	int			maxknownstrings;
	int			numknownstrings;
	int			freeknownstrings;
	ddef_t		*globaldefs;

	unsigned char *knownzone;
	size_t knownzonesize;

	//originally defined in pr_exec, but moved into the switchable qcvm struct
#define	MAX_STACK_DEPTH		1024 /*was 64*/	/* was 32 */
	prstack_t	stack[MAX_STACK_DEPTH];
	int			depth;

#define	LOCALSTACK_SIZE		16384 /* was 2048*/
	int			localstack[LOCALSTACK_SIZE];
	int			localstack_used;

	//originally part of the sv_state_t struct
	//FIXME: put worldmodel in here too.
	double		time;
	int			num_edicts;
	int			reserved_edicts;
	int			max_edicts;
	edict_t		*edicts;			// can NOT be array indexed, because edict_t is variable sized, but can be used to reference the world ent
	struct qmodel_s	*worldmodel;
	struct qmodel_s	*(*GetModel)(int modelindex);	//returns the model for the given index, or null.

	//originally from world.c
	areanode_t	areanodes[AREA_NODES];
	int			numareanodes;
};
extern globalvars_t	*pr_global_struct;

#if 0
extern qcvm_t ssqcvm;
#define qcvm (&ssqcvm)
#define PR_SwitchQCVM(n)
#else
extern qcvm_t *qcvm;
void PR_SwitchQCVM(qcvm_t *nvm);
#endif

extern builtin_t pr_ssqcbuiltins[];
extern int pr_ssqcnumbuiltins;
extern builtin_t pr_csqcbuiltins[];
extern int pr_csqcnumbuiltins;

#endif	/* _QUAKE_PROGS_H */