/*
  Copyright(C) 2019-2021  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 as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  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_window_function.h"

#ifdef __cplusplus
extern "C" {
#endif

void
grn_window_function_executor_init_from_env(void);

struct _grn_window_function_executor {
  grn_obj tag;
  grn_obj tables;
  grn_obj is_context_tables;
  grn_obj source;
  grn_obj sort_keys;
  grn_obj group_keys;
  grn_obj output_column_name;
  struct {
    grn_table_sort_key *sort_keys;
    size_t n_sort_keys;
    grn_table_sort_key *group_keys;
    size_t n_group_keys;
    grn_table_sort_key *window_sort_keys;
    size_t n_window_sort_keys;
    grn_obj key_columns;
    grn_obj *sorted;
  } context;
  struct {
    size_t n;
    grn_obj *previous;
    grn_obj *current;
  } values;
  grn_obj window_function_calls;
  grn_obj output_columns;
  grn_window window;
};

grn_rc
grn_window_function_executor_init(grn_ctx *ctx,
                                  grn_window_function_executor *executor);
grn_rc
grn_window_function_executor_fin(grn_ctx *ctx,
                                 grn_window_function_executor *executor);


#ifdef __cplusplus
}
#endif
