#define PROGSUSED
#include "progsint.h"
#include <stdlib.h>

typedef struct prmemb_s {
	struct prmemb_s *prev;
	int level;
} prmemb_t;
void *PRHunkAlloc(progfuncs_t *progfuncs, int ammount)
{
	prmemb_t *mem;
	ammount = sizeof(prmemb_t)+((ammount + 3)&~3);
	mem = memalloc(ammount);
	memset(mem, 0, ammount);
	mem->prev = memb;
	if (!memb)
		mem->level = 1;
	else
		mem->level = ((prmemb_t *)memb)->level+1;
	memb = mem;

	return ((char *)mem)+sizeof(prmemb_t);
}

int PRHunkMark(progfuncs_t *progfuncs)
{
	return ((prmemb_t *)memb)->level;
}
void PRHunkFree(progfuncs_t *progfuncs, int mark)
{
	prmemb_t *omem;
	while(memb)
	{
		if (memb->level <= mark)
			return;

		omem = memb;
		memb = memb->prev;
		memfree(omem);
	}
	return;
}

//for 64bit systems. :)
//addressable memory is memory available to the vm itself for writing.
//once allocated, it cannot be freed for the lifetime of the VM.
void *PRAddressableAlloc(progfuncs_t *progfuncs, int ammount)
{
	ammount = (ammount + 4)&~3;	//round up to 4
	if (addressableused + ammount > addressablesize)
		Sys_Error("Not enough addressable memory for progs VM");

	addressableused += ammount;

#ifdef _WIN32
	if (!VirtualAlloc (addressablehunk, addressableused, MEM_COMMIT, PAGE_READWRITE))
		Sys_Error("VirtualAlloc failed. Blame windows.");
#endif

	return &addressablehunk[addressableused-ammount];
}

void PRAddressableFlush(progfuncs_t *progfuncs, int totalammount)
{
	addressableused = 0;
	if (totalammount < 0)	//flush
	{
		totalammount = addressablesize;
//		return;
	}

	if (addressablehunk)
#ifdef _WIN32
		VirtualFree(addressablehunk, 0, MEM_RELEASE);	//doesn't this look complicated? :p
	addressablehunk = VirtualAlloc (NULL, totalammount, MEM_RESERVE, PAGE_NOACCESS);
#else
		free(addressablehunk);
	addressablehunk = malloc(totalammount);	//linux will allocate-on-use anyway, which is handy.
//	memset(addressablehunk, 0xff, totalammount);
#endif
	addressablesize = totalammount;
}

int PR_InitEnts(progfuncs_t *progfuncs, int max_ents)
{
	maxedicts = max_ents;

	sv_num_edicts = 0;

	max_fields_size = fields_size;

	prinst->edicttable = PRHunkAlloc(progfuncs, maxedicts*sizeof(struct edicts_s *));
	sv_edicts = PRHunkAlloc(progfuncs, externs->edictsize);
	prinst->edicttable[0] = sv_edicts;
	((edictrun_t*)prinst->edicttable[0])->fields = PRAddressableAlloc(progfuncs, max_fields_size);
	ED_ClearEdict(progfuncs, sv_edicts);
	sv_num_edicts = 1;

	return max_fields_size;
}
char tempedicts[2048];	//used as a safty buffer
void PR_Configure (progfuncs_t *progfuncs, int addressable_size, int max_progs)	//can be used to wipe all memory
{
	int i;
	edictrun_t *e;

//	int a;
	max_fields_size=0;
	fields_size = 0;
	progfuncs->stringtable = 0;
	QC_StartShares(progfuncs);
	QC_InitShares(progfuncs);

	for ( i=1 ; i<maxedicts; i++)
	{
		e = (edictrun_t *)(prinst->edicttable[i]);
		prinst->edicttable[i] = NULL;
//		e->entnum = i;
		if (e)
			memfree(e);
	}

	PRHunkFree(progfuncs, 0);	//clear mem - our hunk may not be a real hunk.
	if (addressable_size<0)
		addressable_size = 8*1024*1024;
	PRAddressableFlush(progfuncs, addressable_size);

	pr_progstate = PRHunkAlloc(progfuncs, sizeof(progstate_t) * max_progs);

/*		for(a = 0; a < max_progs; a++)
		{
			pr_progstate[a].progs = NULL;
		}		
*/
		
	maxprogs = max_progs;
	pr_typecurrent=-1;

	prinst->reorganisefields = false;

	maxedicts = 1;
	sv_num_edicts = 1;	//set up a safty buffer so things won't go horribly wrong too often
	sv_edicts=(struct edict_s *)tempedicts;
	((edictrun_t*)sv_edicts)->readonly = true;
}



struct globalvars_s *PR_globals (progfuncs_t *progfuncs, progsnum_t pnum)
{
	if (pnum < 0)
	{
		if (!current_progstate)
			return NULL;	//err.. you've not loaded one yet.
		return (struct globalvars_s *)current_progstate->globals;
	}
	return (struct globalvars_s *)pr_progstate[pnum].globals;
}

struct entvars_s *PR_entvars (progfuncs_t *progfuncs, struct edict_s *ed)
{
	if (((edictrun_t *)ed)->isfree)
		return NULL;

	return (struct entvars_s *)edvars(ed);
}

func_t PR_FindFunc(progfuncs_t *progfuncs, char *funcname, progsnum_t pnum)
{

	dfunction_t *f=NULL;
	if (pnum == PR_ANY)
	{
		for (pnum = 0; pnum < maxprogs; pnum++)
		{
			if (!pr_progstate[pnum].progs)
				continue;
			f = ED_FindFunction(progfuncs, funcname, &pnum, pnum);
			if (f)
				break;
		}
	}
	else if (pnum == PR_ANYBACK)	//run backwards
	{
		for (pnum = maxprogs-1; pnum >= 0; pnum--)
		{
			if (!pr_progstate[pnum].progs)
				continue;
			f = ED_FindFunction(progfuncs, funcname, &pnum, pnum);
			if (f)
				break;
		}
	}
	else
		f = ED_FindFunction(progfuncs, funcname, &pnum, pnum);
	if (!f)
		return 0;

	{
	ddef16_t *var16;
	ddef32_t *var32;
	switch(pr_progstate[pnum].intsize)
	{
	case 24:
	case 16:
		var16 = ED_FindTypeGlobalFromProgs16(progfuncs, funcname, pnum, ev_function);	//we must make sure we actually have a function def - 'light' is defined as a field before it is defined as a function.
		if (!var16)
			return (f - pr_progstate[pnum].functions) | (pnum << 24);
		return *(int *)&pr_progstate[pnum].globals[var16->ofs];	
	case 32:
		var32 = ED_FindTypeGlobalFromProgs32(progfuncs, funcname, pnum, ev_function);	//we must make sure we actually have a function def - 'light' is defined as a field before it is defined as a function.
		if (!var32)
			return (f - pr_progstate[pnum].functions) | (pnum << 24);
		return *(int *)&pr_progstate[pnum].globals[var32->ofs];	
	}
	Sys_Error("Error with def size (PR_FindFunc)");	
	}
	return 0;
}

eval_t *PR_FindGlobal(progfuncs_t *progfuncs, char *globname, progsnum_t pnum)
{
	ddef16_t *var16;
	ddef32_t *var32;
	if (pnum == PR_CURRENT)
		pnum = pr_typecurrent;
	switch(pr_progstate[pnum].intsize)
	{
	case 16:
	case 24:
		if (!(var16 = ED_FindGlobalFromProgs16(progfuncs, globname, pnum)))
			return NULL;

		return (eval_t *)&pr_progstate[pnum].globals[var16->ofs];
	case 32:
		if (!(var32 = ED_FindGlobalFromProgs32(progfuncs, globname, pnum)))
			return NULL;

		return (eval_t *)&pr_progstate[pnum].globals[var32->ofs];
	}
	Sys_Error("Error with def size (PR_FindGlobal)");
	return NULL;
}

void SetGlobalEdict(progfuncs_t *progfuncs, struct edict_s *ed, int ofs)
{
	((int*)pr_globals)[ofs] = EDICT_TO_PROG(progfuncs, ed);
}

char *PR_VarString (progfuncs_t *progfuncs, int	first)
{
	int		i;
	static char out[1024];
	char *s;
	
	out[0] = 0;
	for (i=first ; i<pr_argc ; i++)
	{
		if (G_STRING(OFS_PARM0+i*3))
		{
			s=G_STRING((OFS_PARM0+i*3)) + progfuncs->stringtable;
			strcat (out, s);

//#ifdef PARANOID
			if (strlen(out)+1 >= sizeof(out))
				Sys_Error("VarString (builtin call ending with strings) exceeded maximum string length of %i chars", sizeof(out));
//#endif
		}
	}
	return out;
}

eval_t *GetEdictFieldValue(progfuncs_t *progfuncs, struct edict_s *ed, char *name, evalc_t *cache)
{
	fdef_t *var;
	if (!cache)
	{
		var = ED_FindField(progfuncs, name);
		if (!var)
			return NULL;
		return (eval_t *) &(((int*)(((edictrun_t*)ed)->fields))[var->ofs]);
	}
	if (!cache->varname)
	{
		cache->varname = name;
		var = ED_FindField(progfuncs, name);		
		if (!var)
		{
			cache->ofs32 = NULL;
			return NULL;
		}
		cache->ofs32 = var;
		return (eval_t *) &(((int*)(((edictrun_t*)ed)->fields))[var->ofs]);
	}
	if (cache->ofs32 == NULL)
		return NULL;
	return (eval_t *) &(((int*)(((edictrun_t*)ed)->fields))[cache->ofs32->ofs]);
}

struct edict_s *ProgsToEdict (progfuncs_t *progfuncs, int progs)
{
	return (struct edict_s *)PROG_TO_EDICT(progfuncs, progs);
}
int EdictToProgs (progfuncs_t *progfuncs, struct edict_s *ed)
{
	return EDICT_TO_PROG(progfuncs, ed);
}


struct qcthread_s *PR_ForkStack	(progfuncs_t *progfuncs);
void PR_ResumeThread			(progfuncs_t *progfuncs, struct qcthread_s *thread);
void	PR_AbortStack			(progfuncs_t *progfuncs);


void RegisterBuiltin(progfuncs_t *progfncs, char *name, builtin_t func);

progfuncs_t deffuncs = {
	PROGSTRUCT_VERSION,
	PR_Configure,
	PR_LoadProgs,
	PR_InitEnts,
	PR_ExecuteProgram,
	PR_SwitchProgs,
	PR_globals,
	PR_entvars,
	PR_RunError,
	ED_Print,
	ED_Alloc,
	ED_Free,

	EDICT_NUM,
	NUM_FOR_EDICT,


	SetGlobalEdict,

	PR_VarString,

	NULL,
	PR_FindFunc,
#ifdef MINIMAL
	NULL,
	NULL,
#else
	Comp_Begin,
	Comp_Continue,
#endif

	filefromprogs,
	filefromnewprogs,

	SaveEnts,
	LoadEnts,

	SaveEnt,
	RestoreEnt,

	PR_FindGlobal,
	ED_NewString,
	(void*)PRHunkAlloc,

	GetEdictFieldValue,
	ProgsToEdict,
	EdictToProgs,

	EvaluateDebugString,

	NULL,
	PR_StackTrace,

	PR_ToggleBreakpoint,
	0,
	NULL,
#ifdef MINIMAL
	NULL,
#else
	Decompile,
#endif
	NULL,
	NULL,
	RegisterBuiltin,

	0,
	0,

	PR_ForkStack,
	PR_ResumeThread,
	PR_AbortStack,

	0,

	QC_RegisterFieldVar,

	0,
	0
};
#undef printf

//defs incase following structure is not passed.
struct edict_s *safesv_edicts;
int safesv_num_edicts;
double safetime=0;

progexterns_t defexterns = {
	PROGSTRUCT_VERSION,		

	NULL, //char *(*ReadFile) (char *fname, void *buffer, int len);
	NULL, //int (*FileSize) (char *fname);	//-1 if file does not exist
	NULL, //bool (*WriteFile) (char *name, void *data, int len);
	printf, //void (*printf) (char *, ...);
	(void*)exit, //void (*Sys_Error) (char *, ...);
	NULL, //void (*Abort) (char *, ...);
	sizeof(edictrun_t), //int edictsize;	//size of edict_t

	NULL, //void (*entspawn) (struct edict_s *ent);	//ent has been spawned, but may not have all the extra variables (that may need to be set) set
	NULL, //bool (*entcanfree) (struct edict_s *ent);	//return true to stop ent from being freed
	NULL, //void (*stateop) (float var, func_t func);
	NULL,
	NULL,
	NULL,

	//used when loading a game
	NULL, //builtin_t *(*builtinsfor) (int num);	//must return a pointer to the builtins that were used before the state was saved.
	NULL, //void (*loadcompleate) (int edictsize);	//notification to reset any pointers.

	(void*)malloc, //void *(*memalloc) (int size);	//small string allocation	malloced and freed randomly by the executor. (use memalloc if you want)
	free, //void (*memfree) (void * mem);


	NULL, //builtin_t *globalbuiltins;	//these are available to all progs
	0, //int numglobalbuiltins;

	PR_NOCOMPILE,

	&safetime, //double *gametime;

	&safesv_edicts, //struct edict_s **sv_edicts;
	&safesv_num_edicts, //int *sv_num_edicts;

	NULL, //int (*useeditor) (char *filename, int line, int nump, char **parms);
};

//progfuncs_t *progfuncs = NULL;
#undef memfree
#undef prinst
#undef extensionbuiltin
#undef field
#undef shares
#undef sv_num_edicts


#ifdef QCLIBDLL_EXPORTS
__declspec(dllexport)
#endif 
void CloseProgs(progfuncs_t *inst)
{
//	extensionbuiltin_t *eb;
	void (VARGS *f) (void *);

	int i;
	edictrun_t *e;

	f = inst->parms->memfree;

	for ( i=1 ; i<inst->maxedicts; i++)
	{
		e = (edictrun_t *)(inst->prinst->edicttable[i]);
		inst->prinst->edicttable[i] = NULL;
		if (e)
		{
//			e->entnum = i;
			f(e);
		}
	}

	PRHunkFree(inst, 0);

/*
	while(inst->prinst->extensionbuiltin)
	{
		eb = inst->prinst->extensionbuiltin->prev;
		f(inst->prinst->extensionbuiltin);
		inst->prinst->extensionbuiltin = eb;
	}
*/
	if (inst->prinst->field)
		f(inst->prinst->field);
	if (inst->prinst->shares)
		f(inst->prinst->shares);	//free memory
	f(inst->prinst);
	f(inst);
}

void RegisterBuiltin(progfuncs_t *progfuncs, char *name, builtin_t func)
{
/*
	extensionbuiltin_t *eb;
	eb = memalloc(sizeof(extensionbuiltin_t));
	eb->prev = progfuncs->prinst->extensionbuiltin;
	progfuncs->prinst->extensionbuiltin = eb;
	eb->name = name;
	eb->func = func;
*/
}

#ifndef WIN32
#define QCLIBINT	//don't use dllspecifications
#endif

#if defined(QCLIBDLL_EXPORTS)
__declspec(dllexport)
#endif
progfuncs_t * InitProgs(progexterns_t *ext)
{	
	progfuncs_t *funcs;

	if (!ext)
		ext = &defexterns;
	else
	{
		int i;
		if (ext->progsversion > PROGSTRUCT_VERSION)
			return NULL;

		for (i=0;i<sizeof(progexterns_t); i+=4)	//make sure there are no items left out.
			if (!*(int *)((char *)ext+i))
				*(int *)((char *)ext+i) = *(int *)((char *)&defexterns+i);		
	}	
#undef memalloc
#undef pr_trace
	funcs = ext->memalloc(sizeof(progfuncs_t));	
	memcpy(funcs, &deffuncs, sizeof(progfuncs_t));

	funcs->prinst = ext->memalloc(sizeof(prinst_t));
	memset(funcs->prinst,0, sizeof(prinst_t));

	funcs->pr_trace = &funcs->prinst->pr_trace;
	funcs->progstate = &funcs->pr_progstate;
	funcs->callargc = &funcs->pr_argc;

	funcs->parms = ext;

	SetEndian();
	
	return funcs;
}
















#ifdef QCC
void main (int argc, char **argv)
{
	progexterns_t ext;

	progfuncs_t *funcs;
	funcs = InitProgs(&ext);
	if (funcs->PR_StartCompile(argc, argv))
		while(funcs->PR_ContinueCompile());
}
#endif
