/* -*- c-basic-offset: 2 -*- */
/*
  Copyright(C) 2009-2016  Brazil
  Copyright(C) 2020  Sutou Kouhei <kou@clear-code.com>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License version 2.1 as published by the Free Software Foundation.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#pragma once

#include "grn.h"

#ifdef __cplusplus
extern "C" {
#endif

/* rset is result set */

typedef struct {
  double score;
  int n_subrecs;
  int subrecs[1];
} grn_rset_recinfo;

typedef struct {
  grn_id rid;
  uint32_t sid;
  uint32_t pos;
} grn_rset_posinfo;

#define GRN_RSET_UTIL_BIT (0x80000000)

typedef union {
  int64_t value_int64;
  double value_double;
} grn_rset_aggregated_value;

#define GRN_RSET_N_SUBRECS_SIZE (sizeof(int))
#define GRN_RSET_MAX_SIZE       (sizeof(grn_rset_aggregated_value))
#define GRN_RSET_MIN_SIZE       (sizeof(grn_rset_aggregated_value))
#define GRN_RSET_SUM_SIZE       (sizeof(grn_rset_aggregated_value))
#define GRN_RSET_MEAN_SIZE      (sizeof(double) + sizeof(uint64_t))

#define GRN_RSET_SCORE_SIZE (sizeof(double))

#define GRN_RSET_N_SUBRECS(ri) ((ri)->n_subrecs & ~GRN_RSET_UTIL_BIT)

#define GRN_RSET_SUBREC_SIZE(subrec_size) \
  (GRN_RSET_SCORE_SIZE + subrec_size)
#define GRN_RSET_SUBRECS_CMP(a,b,dir) (((a) - (b))*(dir))
#define GRN_RSET_SUBRECS_NTH(subrecs,size,n) \
  ((double *)((byte *)subrecs + n * GRN_RSET_SUBREC_SIZE(size)))
#define GRN_RSET_SUBRECS_COPY(subrecs,size,n,src) \
  (grn_memcpy(GRN_RSET_SUBRECS_NTH(subrecs, size, n), src, GRN_RSET_SUBREC_SIZE(size)))
#define GRN_RSET_SUBRECS_SIZE(subrec_size,n) \
  (GRN_RSET_SUBREC_SIZE(subrec_size) * n)

void grn_rset_add_subrec(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table,
                         double score,
                         grn_rset_posinfo *pi,
                         int dir);

uint32_t grn_rset_recinfo_calc_values_size(grn_ctx *ctx,
                                           grn_table_group_flags flags);

void grn_rset_recinfo_update_calc_values(grn_ctx *ctx,
                                         grn_rset_recinfo *ri,
                                         grn_obj *table,
                                         grn_obj *value);

grn_rset_aggregated_value *
grn_rset_recinfo_get_max_(grn_ctx *ctx,
                          grn_rset_recinfo *ri,
                          grn_obj *table);
grn_rset_aggregated_value
grn_rset_recinfo_get_max(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table);
void
grn_rset_recinfo_set_max(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table,
                         grn_rset_aggregated_value max);

grn_rset_aggregated_value *
grn_rset_recinfo_get_min_(grn_ctx *ctx,
                          grn_rset_recinfo *ri,
                          grn_obj *table);
grn_rset_aggregated_value
grn_rset_recinfo_get_min(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table);
void
grn_rset_recinfo_set_min(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table,
                         grn_rset_aggregated_value min);

grn_rset_aggregated_value *
grn_rset_recinfo_get_sum_(grn_ctx *ctx,
                          grn_rset_recinfo *ri,
                          grn_obj *table);
grn_rset_aggregated_value
grn_rset_recinfo_get_sum(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table);
void
grn_rset_recinfo_set_sum(grn_ctx *ctx,
                         grn_rset_recinfo *ri,
                         grn_obj *table,
                         grn_rset_aggregated_value sum);

double *grn_rset_recinfo_get_mean_(grn_ctx *ctx,
                                   grn_rset_recinfo *ri,
                                   grn_obj *table);
double grn_rset_recinfo_get_mean(grn_ctx *ctx,
                                 grn_rset_recinfo *ri,
                                 grn_obj *table);
void grn_rset_recinfo_set_mean(grn_ctx *ctx,
                               grn_rset_recinfo *ri,
                               grn_obj *table,
                               double avg);

#ifdef __cplusplus
}
#endif
