/*
 * contrib/btree_gist/btree_macaddr.c
 */
#include "postgres.h"

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/fmgrprotos.h"
#include "utils/inet.h"
#include "utils/rel.h"
#include "utils/sortsupport.h"

typedef struct
{
	macaddr		lower;
	macaddr		upper;
	char		pad[4];			/* make struct size = sizeof(gbtreekey16) */
} macKEY;

/* GiST support functions */
PG_FUNCTION_INFO_V1(gbt_macad_compress);
PG_FUNCTION_INFO_V1(gbt_macad_fetch);
PG_FUNCTION_INFO_V1(gbt_macad_union);
PG_FUNCTION_INFO_V1(gbt_macad_picksplit);
PG_FUNCTION_INFO_V1(gbt_macad_consistent);
PG_FUNCTION_INFO_V1(gbt_macad_penalty);
PG_FUNCTION_INFO_V1(gbt_macad_same);
PG_FUNCTION_INFO_V1(gbt_macaddr_sortsupport);


static bool
gbt_macadgt(const void *a, const void *b, FmgrInfo *flinfo)
{
	return DatumGetBool(DirectFunctionCall2(macaddr_gt, PointerGetDatum(a), PointerGetDatum(b)));
}
static bool
gbt_macadge(const void *a, const void *b, FmgrInfo *flinfo)
{
	return DatumGetBool(DirectFunctionCall2(macaddr_ge, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macadeq(const void *a, const void *b, FmgrInfo *flinfo)
{
	return DatumGetBool(DirectFunctionCall2(macaddr_eq, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macadle(const void *a, const void *b, FmgrInfo *flinfo)
{
	return DatumGetBool(DirectFunctionCall2(macaddr_le, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool
gbt_macadlt(const void *a, const void *b, FmgrInfo *flinfo)
{
	return DatumGetBool(DirectFunctionCall2(macaddr_lt, PointerGetDatum(a), PointerGetDatum(b)));
}


static int
gbt_macadkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
	macKEY	   *ia = (macKEY *) (((const Nsrt *) a)->t);
	macKEY	   *ib = (macKEY *) (((const Nsrt *) b)->t);
	int			res;

	res = DatumGetInt32(DirectFunctionCall2(macaddr_cmp, MacaddrPGetDatum(&ia->lower), MacaddrPGetDatum(&ib->lower)));
	if (res == 0)
		return DatumGetInt32(DirectFunctionCall2(macaddr_cmp, MacaddrPGetDatum(&ia->upper), MacaddrPGetDatum(&ib->upper)));

	return res;
}


static const gbtree_ninfo tinfo =
{
	gbt_t_macad,
	sizeof(macaddr),
	16,							/* sizeof(gbtreekey16) */
	gbt_macadgt,
	gbt_macadge,
	gbt_macadeq,
	gbt_macadle,
	gbt_macadlt,
	gbt_macadkey_cmp,
	NULL
};


/**************************************************
 * GiST support functions
 **************************************************/

static uint64
mac_2_uint64(macaddr *m)
{
	unsigned char *mi = (unsigned char *) m;
	uint64		res = 0;
	int			i;

	for (i = 0; i < 6; i++)
		res += (((uint64) mi[i]) << ((uint64) ((5 - i) * 8)));
	return res;
}

Datum
gbt_macad_compress(PG_FUNCTION_ARGS)
{
	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

	PG_RETURN_POINTER(gbt_num_compress(entry, &tinfo));
}

Datum
gbt_macad_fetch(PG_FUNCTION_ARGS)
{
	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);

	PG_RETURN_POINTER(gbt_num_fetch(entry, &tinfo));
}

Datum
gbt_macad_consistent(PG_FUNCTION_ARGS)
{
	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
	macaddr    *query = (macaddr *) PG_GETARG_POINTER(1);
	StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
#ifdef NOT_USED
	Oid			subtype = PG_GETARG_OID(3);
#endif
	bool	   *recheck = (bool *) PG_GETARG_POINTER(4);
	macKEY	   *kkk = (macKEY *) DatumGetPointer(entry->key);
	GBT_NUMKEY_R key;

	/* All cases served by this function are exact */
	*recheck = false;

	key.lower = (GBT_NUMKEY *) &kkk->lower;
	key.upper = (GBT_NUMKEY *) &kkk->upper;

	PG_RETURN_BOOL(gbt_num_consistent(&key, query, &strategy,
									  GIST_LEAF(entry), &tinfo, fcinfo->flinfo));
}


Datum
gbt_macad_union(PG_FUNCTION_ARGS)
{
	GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
	void	   *out = palloc0(sizeof(macKEY));

	*(int *) PG_GETARG_POINTER(1) = sizeof(macKEY);
	PG_RETURN_POINTER(gbt_num_union(out, entryvec, &tinfo, fcinfo->flinfo));
}


Datum
gbt_macad_penalty(PG_FUNCTION_ARGS)
{
	macKEY	   *origentry = (macKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
	macKEY	   *newentry = (macKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
	float	   *result = (float *) PG_GETARG_POINTER(2);
	uint64		iorg[2],
				inew[2];

	iorg[0] = mac_2_uint64(&origentry->lower);
	iorg[1] = mac_2_uint64(&origentry->upper);
	inew[0] = mac_2_uint64(&newentry->lower);
	inew[1] = mac_2_uint64(&newentry->upper);

	penalty_num(result, iorg[0], iorg[1], inew[0], inew[1]);

	PG_RETURN_POINTER(result);
}

Datum
gbt_macad_picksplit(PG_FUNCTION_ARGS)
{
	PG_RETURN_POINTER(gbt_num_picksplit((GistEntryVector *) PG_GETARG_POINTER(0),
										(GIST_SPLITVEC *) PG_GETARG_POINTER(1),
										&tinfo, fcinfo->flinfo));
}

Datum
gbt_macad_same(PG_FUNCTION_ARGS)
{
	macKEY	   *b1 = (macKEY *) PG_GETARG_POINTER(0);
	macKEY	   *b2 = (macKEY *) PG_GETARG_POINTER(1);
	bool	   *result = (bool *) PG_GETARG_POINTER(2);

	*result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
	PG_RETURN_POINTER(result);
}

static int
gbt_macaddr_ssup_cmp(Datum x, Datum y, SortSupport ssup)
{
	macKEY	   *arg1 = (macKEY *) DatumGetPointer(x);
	macKEY	   *arg2 = (macKEY *) DatumGetPointer(y);

	/* for leaf items we expect lower == upper, so only compare lower */
	return DatumGetInt32(DirectFunctionCall2(macaddr_cmp,
											 MacaddrPGetDatum(&arg1->lower),
											 MacaddrPGetDatum(&arg2->lower)));
}

Datum
gbt_macaddr_sortsupport(PG_FUNCTION_ARGS)
{
	SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);

	ssup->comparator = gbt_macaddr_ssup_cmp;
	ssup->ssup_extra = NULL;

	PG_RETURN_VOID();
}
