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

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/cash.h"

typedef struct {
    Cash lower;
    Cash upper;
} cashKEY;

/*
** Cash ops
*/
PG_FUNCTION_INFO_V1(gbt_cash_compress);
PG_FUNCTION_INFO_V1(gbt_cash_union);
PG_FUNCTION_INFO_V1(gbt_cash_picksplit);
PG_FUNCTION_INFO_V1(gbt_cash_consistent);
PG_FUNCTION_INFO_V1(gbt_cash_distance);
PG_FUNCTION_INFO_V1(gbt_cash_penalty);
PG_FUNCTION_INFO_V1(gbt_cash_same);

extern "C" Datum gbt_cash_compress(PG_FUNCTION_ARGS);
extern "C" Datum gbt_cash_union(PG_FUNCTION_ARGS);
extern "C" Datum gbt_cash_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum gbt_cash_consistent(PG_FUNCTION_ARGS);
extern "C" Datum gbt_cash_distance(PG_FUNCTION_ARGS);
extern "C" Datum gbt_cash_penalty(PG_FUNCTION_ARGS);
extern "C" Datum gbt_cash_same(PG_FUNCTION_ARGS);

static bool gbt_cashgt(const void* a, const void* b)
{
    return (*((const Cash*)a) > *((const Cash*)b));
}
static bool gbt_cashge(const void* a, const void* b)
{
    return (*((const Cash*)a) >= *((const Cash*)b));
}
static bool gbt_casheq(const void* a, const void* b)
{
    return (*((const Cash*)a) == *((const Cash*)b));
}
static bool gbt_cashle(const void* a, const void* b)
{
    return (*((const Cash*)a) <= *((const Cash*)b));
}
static bool gbt_cashlt(const void* a, const void* b)
{
    return (*((const Cash*)a) < *((const Cash*)b));
}

static int gbt_cashkey_cmp(const void* a, const void* b)
{
    cashKEY* ia = (cashKEY*)(((const Nsrt*)a)->t);
    cashKEY* ib = (cashKEY*)(((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_cash_dist(const void* a, const void* b)
{
    return GET_FLOAT_DISTANCE(Cash, a, b);
}

static const gbtree_ninfo tinfo = {gbt_t_cash,
    sizeof(Cash),
    gbt_cashgt,
    gbt_cashge,
    gbt_casheq,
    gbt_cashle,
    gbt_cashlt,
    gbt_cashkey_cmp,
    gbt_cash_dist};

PG_FUNCTION_INFO_V1(cash_dist);
extern "C" Datum cash_dist(PG_FUNCTION_ARGS);
Datum cash_dist(PG_FUNCTION_ARGS)
{
    Cash a = PG_GETARG_CASH(0);
    Cash b = PG_GETARG_CASH(1);
    Cash r;
    Cash ra;

    r = a - b;
    ra = Abs(r);

    /* Overflow check. */
    if (ra < 0 || (!SAMESIGN(a, b) && !SAMESIGN(r, a)))
        ereport(ERROR, (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE), errmsg("money out of range")));

    PG_RETURN_CASH(ra);
}

/**************************************************
 * Cash ops
 **************************************************/

Datum gbt_cash_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_cash_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    Cash query = PG_GETARG_CASH(1);
    StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);

    bool* recheck = (bool*)PG_GETARG_POINTER(4);
    cashKEY* kkk = (cashKEY*)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_cash_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    Cash query = PG_GETARG_CASH(1);

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

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

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

Datum gbt_cash_same(PG_FUNCTION_ARGS)
{
    cashKEY* b1 = (cashKEY*)PG_GETARG_POINTER(0);
    cashKEY* b2 = (cashKEY*)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);
}