/*
 * contrib/btree_gist/btree_float4.c
 */
#include "postgres.h"
#include "knl/knl_variable.h"

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

typedef struct float4key {
    float4 lower;
    float4 upper;
} float4KEY;

/*
** float4 ops
*/
PG_FUNCTION_INFO_V1(gbt_float4_compress);
PG_FUNCTION_INFO_V1(gbt_float4_union);
PG_FUNCTION_INFO_V1(gbt_float4_picksplit);
PG_FUNCTION_INFO_V1(gbt_float4_consistent);
PG_FUNCTION_INFO_V1(gbt_float4_distance);
PG_FUNCTION_INFO_V1(gbt_float4_penalty);
PG_FUNCTION_INFO_V1(gbt_float4_same);

extern "C" Datum gbt_float4_compress(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float4_union(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float4_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float4_consistent(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float4_distance(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float4_penalty(PG_FUNCTION_ARGS);
extern "C" Datum gbt_float4_same(PG_FUNCTION_ARGS);

static bool gbt_float4gt(const void* a, const void* b)
{
    return (*((const float4*)a) > *((const float4*)b));
}
static bool gbt_float4ge(const void* a, const void* b)
{
    return (*((const float4*)a) >= *((const float4*)b));
}
static bool gbt_float4eq(const void* a, const void* b)
{
    return (*((const float4*)a) == *((const float4*)b));
}
static bool gbt_float4le(const void* a, const void* b)
{
    return (*((const float4*)a) <= *((const float4*)b));
}
static bool gbt_float4lt(const void* a, const void* b)
{
    return (*((const float4*)a) < *((const float4*)b));
}

static int gbt_float4key_cmp(const void* a, const void* b)
{
    float4KEY* ia = (float4KEY*)(((const Nsrt*)a)->t);
    float4KEY* ib = (float4KEY*)(((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_float4_dist(const void* a, const void* b)
{
    return GET_FLOAT_DISTANCE(float4, a, b);
}

static const gbtree_ninfo tinfo = {gbt_t_float4,
    sizeof(float4),
    gbt_float4gt,
    gbt_float4ge,
    gbt_float4eq,
    gbt_float4le,
    gbt_float4lt,
    gbt_float4key_cmp,
    gbt_float4_dist};

PG_FUNCTION_INFO_V1(float4_dist);
extern "C" Datum float4_dist(PG_FUNCTION_ARGS);
Datum float4_dist(PG_FUNCTION_ARGS)
{
    float4 a = PG_GETARG_FLOAT4(0);
    float4 b = PG_GETARG_FLOAT4(1);
    float4 r;

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

    PG_RETURN_FLOAT4(Abs(r));
}

/**************************************************
 * float4 ops
 **************************************************/

Datum gbt_float4_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_float4_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    float4 query = PG_GETARG_FLOAT4(1);
    StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);

    bool* recheck = (bool*)PG_GETARG_POINTER(4);
    float4KEY* kkk = (float4KEY*)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_float4_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    float4 query = PG_GETARG_FLOAT4(1);

    float4KEY* kkk = (float4KEY*)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_float4_union(PG_FUNCTION_ARGS)
{
    GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
    void* out = palloc(sizeof(float4KEY));

    *(int*)PG_GETARG_POINTER(1) = sizeof(float4KEY);
    PG_RETURN_POINTER(gbt_num_union((GBT_NUMKEY*)out, entryvec, &tinfo));
}

Datum gbt_float4_penalty(PG_FUNCTION_ARGS)
{
    float4KEY* origentry = (float4KEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(0))->key);
    float4KEY* newentry = (float4KEY*)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_float4_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(
        gbt_num_picksplit((GistEntryVector*)PG_GETARG_POINTER(0), (GIST_SPLITVEC*)PG_GETARG_POINTER(1), &tinfo));
}

Datum gbt_float4_same(PG_FUNCTION_ARGS)
{
    float4KEY* b1 = (float4KEY*)PG_GETARG_POINTER(0);
    float4KEY* b2 = (float4KEY*)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);
}