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#include <stdarg.h>
#include <string.h>
#include <SWI-Prolog.h>
#include "defs.h"

static int Plpv(term_t, const char *, va_list);
static int Plgv(term_t, const char *, va_list);

/* Call Prolog predicate once. */
int Pl(const char *szMod, const char *szPred, const char *szFmt, ...)
{
	int iArity;
	term_t t;
	va_list vl, vl2;

	iArity = strlen(szFmt);
	t = PL_new_term_refs(iArity);

	va_start(vl, szFmt);
	va_copy(vl2, vl);

	if (!Plpv(t, szFmt, vl)) goto f;
	if (!PL_call_predicate(NULL, PL_Q_NORMAL,
		PL_predicate(szPred, iArity, szMod), t))
		goto f;
	if (!Plgv(t, szFmt, vl2)) goto f;

	va_end(vl);
	va_end(vl2);
	return 1;
f:	va_end(vl);
	va_end(vl2);
	return 0;
}

/* Put known values in term. */
int Plp(term_t t, const char *szFmt, ...)
{
	int r;
	va_list vl;
	va_start(vl, szFmt);
	r = Plpv(t, szFmt, vl);
	va_end(vl);
	return r;
}
int Plpv(term_t t, const char *szFmt, va_list vl)
{
	int i;
	for (i = 0; szFmt[i]; i++) {
		switch (szFmt[i]) {
		case 'I':
		    {
			int x;
			x = va_arg(vl, int);
			if (!PL_put_integer(t+i, x)) return 0;
			break;
		    }
		case 'A':
		    {
			atom_t x;
			x = va_arg(vl, atom_t);
			if (!PL_put_atom(t+i, x)) return 0;
			break;
		    }
		case 'S':
		    {
			atom_t a;
			char *x;
			x = va_arg(vl, char *);
			a = PL_new_atom(x);
			if (!PL_put_atom(t+i, a)) return 0;
			break;
		    }
		case 'i':
			va_arg(vl, int *);
			break;
		case 'a':
			va_arg(vl, atom_t *);
			break;
		case 's':
			va_arg(vl, char **);
			break;
		}
	}
	return 1;
}

/* Get unknown values from term. */
int Plg(term_t t, const char *szFmt, ...)
{
	int r;
	va_list vl;
	va_start(vl, szFmt);
	r = Plgv(t, szFmt, vl);
	va_end(vl);
	return r;
}
int Plgv(term_t t, const char *szFmt, va_list vl)
{
	int i;
	for (i = 0; szFmt[i]; i++) {
		switch (szFmt[i]) {
		case 'i':
		    {
			int *lp;
			lp = va_arg(vl, int *);
			if (!PL_get_integer(t+i, lp)) return 0;
			break;
		    }
		case 'a':
		    {
			atom_t *lp;
			lp = va_arg(vl, atom_t *);
			if (!PL_get_atom(t+i, lp)) return 0;
			break;
		    }
		case 's':
		    {
			char **lp;
			lp = va_arg(vl, char **);
			if (!PL_get_atom_chars(t+i, lp)) return 0;
			break;
		    }
		case 'I':
			va_arg(vl, int);
			break;
		case 'A':
			va_arg(vl, atom_t);
			break;
		case 'S':
			va_arg(vl, char *);
			break;
		}
	}
	return 1;
}