/*
 * contrib/btree_gist/btree_float8.c
 */
#include "postgres.h"
#include "knl/knl_variable.h"

#include "btree_gist.h"
#include "btree_utils_num.h"

typedef struct float8key {
    float8 lower;
    float8 upper;
} float8KEY;

/*
** float8 ops
*/
PG_FUNCTION_INFO_V1(gbt_float8_compress);
PG_FUNCTION_INFO_V1(gbt_float8_union);
PG_FUNCTION_INFO_V1(gbt_float8_picksplit);
PG_FUNCTION_INFO_V1(gbt_float8_consistent);
PG_FUNCTION_INFO_V1(gbt_float8_distance);
PG_FUNCTION_INFO_V1(gbt_float8_penalty);
PG_FUNCTION_INFO_V1(gbt_float8_same);

extern "C" Datum gbt_float8_compress(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float8_union(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float8_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float8_consistent(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float8_distance(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float8_penalty(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float8_same(PG_FUNCTION_ARGS);

static bool gbt_float8gt(const void* a, const void* b)
{
    return (*((const float8*)a) > *((const float8*)b));
}
static bool gbt_float8ge(const void* a, const void* b)
{
    return (*((const float8*)a) >= *((const float8*)b));
}
static bool gbt_float8eq(const void* a, const void* b)
{
    return (*((const float8*)a) == *((const float8*)b));
}
static bool gbt_float8le(const void* a, const void* b)
{
    return (*((const float8*)a) <= *((const float8*)b));
}
static bool gbt_float8lt(const void* a, const void* b)
{
    return (*((const float8*)a) < *((const float8*)b));
}

static int gbt_float8key_cmp(const void* a, const void* b)
{
    float8KEY* ia = (float8KEY*)(((const Nsrt*)a)->t);
    float8KEY* ib = (float8KEY*)(((const Nsrt*)b)->t);

    if (ia->lower == ib->lower) {
        if (ia->upper == ib->upper)
            return 0;

        return (ia->upper > ib->upper) ? 1 : -1;
    }

    return (ia->lower > ib->lower) ? 1 : -1;
}

static float8 gbt_float8_dist(const void* a, const void* b)
{
    float8 arg1 = *(const float8*)a;
    float8 arg2 = *(const float8*)b;
    float8 r;

    r = arg1 - arg2;
    CHECKFLOATVAL(r, isinf(arg1) || isinf(arg2), true);

    return Abs(r);
}

static const gbtree_ninfo tinfo = {gbt_t_float8,
    sizeof(float8),
    gbt_float8gt,
    gbt_float8ge,
    gbt_float8eq,
    gbt_float8le,
    gbt_float8lt,
    gbt_float8key_cmp,
    gbt_float8_dist};

PG_FUNCTION_INFO_V1(float8_dist);
extern "C" Datum float8_dist(PG_FUNCTION_ARGS);
Datum float8_dist(PG_FUNCTION_ARGS)
{
    float8 a = PG_GETARG_FLOAT8(0);
    float8 b = PG_GETARG_FLOAT8(1);
    float8 r;

    r = a - b;
    CHECKFLOATVAL(r, isinf(a) || isinf(b), true);

    PG_RETURN_FLOAT8(Abs(r));
}

/**************************************************
 * float8 ops
 **************************************************/

Datum gbt_float8_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    GISTENTRY* retval = NULL;

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

Datum gbt_float8_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    float8 query = PG_GETARG_FLOAT8(1);
    StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);

    bool* recheck = (bool*)PG_GETARG_POINTER(4);
    float8KEY* kkk = (float8KEY*)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, (void*)&query, &strategy, GIST_LEAF(entry), &tinfo));
}

Datum gbt_float8_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    float8 query = PG_GETARG_FLOAT8(1);

    float8KEY* kkk = (float8KEY*)DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

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

    PG_RETURN_FLOAT8(gbt_num_distance(&key, (void*)&query, GIST_LEAF(entry), &tinfo));
}

Datum gbt_float8_union(PG_FUNCTION_ARGS)
{
    GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
    void* out = palloc(sizeof(float8KEY));

    *(int*)PG_GETARG_POINTER(1) = sizeof(float8KEY);
    PG_RETURN_POINTER(gbt_num_union((GBT_NUMKEY*)out, entryvec, &tinfo));
}

Datum gbt_float8_penalty(PG_FUNCTION_ARGS)
{
    float8KEY* origentry = (float8KEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(0))->key);
    float8KEY* newentry = (float8KEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(1))->key);
    float* result = (float*)PG_GETARG_POINTER(2);

    penalty_num(result, origentry->lower, origentry->upper, newentry->lower, newentry->upper);

    PG_RETURN_POINTER(result);
}

Datum gbt_float8_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(
        gbt_num_picksplit((GistEntryVector*)PG_GETARG_POINTER(0), (GIST_SPLITVEC*)PG_GETARG_POINTER(1), &tinfo));
}

Datum gbt_float8_same(PG_FUNCTION_ARGS)
{
    float8KEY* b1 = (float8KEY*)PG_GETARG_POINTER(0);
    float8KEY* b2 = (float8KEY*)PG_GETARG_POINTER(1);
    bool* result = (bool*)PG_GETARG_POINTER(2);

    *result = gbt_num_same((GBT_NUMKEY*)b1, (GBT_NUMKEY*)b2, &tinfo);
    PG_RETURN_POINTER(result);
}