/*
  Copyright (C) 2009-2017  Brazil
  Copyright (C) 2018-2025  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
*/

#include "grn_cast.h"
#include "grn_column.h"
#include "grn_ctx_impl.h"
#include "grn_db.h"
#include "grn_load.h"
#include "grn_obj.h"
#include "grn_table.h"
#include "grn_util.h"

#include <stdio.h>

void
grn_loader_save_error(grn_ctx *ctx, grn_loader *loader)
{
  loader->error.rc = ctx->rc;
  grn_strcpy(loader->error.buffer, GRN_CTX_MSGSIZE, ctx->errbuf);
  loader->error.line = ctx->errline;
  loader->error.file = ctx->errfile;
  loader->error.func = ctx->errfunc;
}

void
grn_loader_on_record_added(grn_ctx *ctx, grn_loader *loader, grn_id id)
{
  if (id == GRN_ID_NIL) {
    grn_loader_save_error(ctx, loader);
    loader->n_record_errors++;
  } else {
    loader->n_records++;
  }
  if (loader->output_ids) {
    GRN_UINT32_PUT(ctx, &(loader->ids), id);
  }
  if (loader->output_errors) {
    GRN_INT32_PUT(ctx, &(loader->return_codes), ctx->rc);
    grn_vector_add_element(ctx,
                           &(loader->error_messages),
                           ctx->errbuf,
                           (uint32_t)strlen(ctx->errbuf),
                           0,
                           GRN_DB_TEXT);
  }
  ERRCLR(ctx);
}

void
grn_loader_on_column_set(grn_ctx *ctx,
                         grn_loader *loader,
                         grn_loader_add_record_data *data)
{
  if (ctx->rc == GRN_SUCCESS) {
    return;
  }

  grn_loader_save_error(ctx, loader);

  grn_obj key_inspected;
  grn_obj value_inspected;
  GRN_TEXT_INIT(&key_inspected, 0);
  GRN_TEXT_INIT(&value_inspected, 0);
  if (data->key) {
    grn_inspect_limited(ctx, &key_inspected, data->key);
  } else {
    if (grn_obj_is_table_with_key(ctx, data->table)) {
      grn_obj key_value;
      GRN_OBJ_INIT(&key_value, GRN_BULK, 0, data->table->header.domain);
      grn_table_get_key2(ctx, data->table, data->id, &key_value);
      grn_inspect_limited(ctx, &key_inspected, &key_value);
      GRN_OBJ_FIN(ctx, &key_value);
    }
  }
  grn_inspect_limited(ctx, &value_inspected, data->current.value);
  if (GRN_TEXT_LEN(&key_inspected) > 0) {
    GRN_DEFINE_NAME(data->table);
    GRN_LOG(ctx,
            GRN_LOG_ERROR,
            "[table][load][%.*s][%.*s] failed to set column value: %s: "
            "key: <%.*s>, value: <%.*s>",
            name_size,
            name,
            (int)(data->current.column_name_size),
            data->current.column_name,
            ctx->errbuf,
            (int)GRN_TEXT_LEN(&key_inspected),
            GRN_TEXT_VALUE(&key_inspected),
            (int)GRN_TEXT_LEN(&value_inspected),
            GRN_TEXT_VALUE(&value_inspected));
  } else {
    GRN_DEFINE_NAME(data->table);
    GRN_LOG(ctx,
            GRN_LOG_ERROR,
            "[table][load][%.*s][%.*s] failed to set column value: %s: "
            "id: <%u>: value: <%.*s>",
            name_size,
            name,
            (int)(data->current.column_name_size),
            data->current.column_name,
            ctx->errbuf,
            data->id,
            (int)GRN_TEXT_LEN(&value_inspected),
            GRN_TEXT_VALUE(&value_inspected));
  }
  GRN_OBJ_FIN(ctx, &key_inspected);
  GRN_OBJ_FIN(ctx, &value_inspected);

  loader->n_column_errors++;
  ERRCLR(ctx);
}

void
grn_loader_on_no_identifier_error(grn_ctx *ctx,
                                  grn_loader *loader,
                                  grn_obj *table)
{
  if (!table) {
    table = loader->table;
  }
  GRN_DEFINE_NAME(table);
  if (table->header.type == GRN_TABLE_NO_KEY) {
    ERR(GRN_INVALID_ARGUMENT,
        "[table][load][%.*s] <_id> isn't specified",
        name_size,
        name);
  } else {
    ERR(GRN_INVALID_ARGUMENT,
        "[table][load][%.*s] neither <_key> nor <_id> is specified",
        name_size,
        name);
  }
}

void
grn_loader_merge(grn_ctx *ctx, grn_loader *loader, grn_loader *loader_other)
{
  /* TODO: information updated by grn_loader_on_record_added() such as
   * loader->n_record_ids are not supported yet. */
  loader->n_column_errors += loader_other->n_column_errors;
  if (loader->error.rc == GRN_SUCCESS &&
      loader_other->error.rc != GRN_SUCCESS) {
    loader->error.rc = loader_other->error.rc;
    grn_strcpy(loader->error.buffer,
               GRN_CTX_MSGSIZE,
               loader_other->error.buffer);
    loader->error.line = loader_other->error.line;
    loader->error.file = loader_other->error.file;
    loader->error.func = loader_other->error.func;
  }
}

grn_obj *
grn_loader_get_column(grn_ctx *ctx,
                      grn_loader *loader,
                      const char *name,
                      size_t name_length)
{
  if (!loader->columns) {
    loader->columns = grn_hash_create(ctx,
                                      NULL,
                                      GRN_TABLE_MAX_KEY_SIZE,
                                      sizeof(grn_obj *),
                                      GRN_OBJ_TABLE_HASH_KEY |
                                        GRN_OBJ_KEY_VAR_SIZE | GRN_HASH_TINY);
  }

  void *value;
  grn_id id =
    grn_hash_get(ctx, loader->columns, name, (unsigned int)name_length, &value);
  if (id != GRN_ID_NIL) {
    return *((grn_obj **)value);
  }

  grn_obj *column =
    grn_obj_column(ctx, loader->table, name, (uint32_t)name_length);
  if (!column) {
    return NULL;
  }

  id = grn_hash_add(ctx,
                    loader->columns,
                    name,
                    (unsigned int)name_length,
                    &value,
                    NULL);
  grn_memcpy(value, &column, sizeof(grn_obj *));
  grn_obj *range = grn_ctx_at(ctx, DB_OBJ(column)->range);
  if (grn_obj_is_table(ctx, range)) {
    GRN_PTR_PUT(ctx, &(loader->ranges), range);
    grn_column_get_all_index_columns(ctx, range, &(loader->indexes));
  }
  grn_column_get_all_index_columns(ctx, column, &(loader->indexes));

  return column;
}

static grn_obj *
values_add(grn_ctx *ctx, grn_loader *loader)
{
  grn_obj *res;
  uint32_t curr_size = loader->values_size * sizeof(grn_obj);
  if (curr_size < GRN_TEXT_LEN(&loader->values)) {
    res = (grn_obj *)(GRN_TEXT_VALUE(&loader->values) + curr_size);
    res->header.domain = GRN_DB_TEXT;
    GRN_BULK_REWIND(res);
  } else {
    if (grn_bulk_space(ctx, &loader->values, sizeof(grn_obj))) {
      return NULL;
    }
    res = (grn_obj *)(GRN_TEXT_VALUE(&loader->values) + curr_size);
    GRN_TEXT_INIT(res, 0);
  }
  loader->values_size++;
  loader->last = res;
  return res;
}

static grn_obj *
values_next(grn_ctx *ctx, grn_obj *value)
{
  if (value->header.domain == GRN_JSON_LOAD_OPEN_BRACKET ||
      value->header.domain == GRN_JSON_LOAD_OPEN_BRACE) {
    value += GRN_UINT32_VALUE(value);
  }
  return value + 1;
}

static uint32_t
grn_loader_bracket_count(grn_ctx *ctx, grn_obj *bracket_value)
{
  uint32_t size;
  grn_obj *head = bracket_value + 1;
  grn_obj *tail = head + GRN_UINT32_VALUE(bracket_value);
  for (size = 0; head < tail; head = values_next(ctx, head), size++) {
  }
  return size;
}

static grn_obj *
grn_loader_bracket_get(grn_ctx *ctx, grn_obj *bracket_value, uint32_t offset)
{
  uint32_t i;
  grn_obj *head = bracket_value + 1;
  grn_obj *tail = head + GRN_UINT32_VALUE(bracket_value);
  for (i = 0; head < tail; head = values_next(ctx, head), i++) {
    if (i == offset) {
      return head;
    }
  }
  return NULL;
}

grn_id
grn_loader_add_record(grn_ctx *ctx,
                      grn_loader *loader,
                      grn_loader_add_record_data *data)
{
  if (data->id != GRN_ID_NIL) {
    if (grn_table_at(ctx, data->table, data->id) == GRN_ID_NIL) {
      if (ctx->rc == GRN_SUCCESS) {
        data->id = grn_table_add(ctx, data->table, NULL, 0, NULL);
      }
    }
  } else if (data->key) {
    grn_table_add_options options = {0};
    data->id = grn_table_add_by_key(ctx, data->table, data->key, &options);
    if (data->id == GRN_ID_NIL) {
      return GRN_ID_NIL;
    }
    if (!options.added && loader->ifexists) {
      grn_obj *v = grn_expr_get_var_by_offset(ctx, loader->ifexists, 0);
      GRN_RECORD_SET(ctx, v, data->id);
      grn_obj *result = grn_expr_exec(ctx, loader->ifexists, 0);
      if (!grn_obj_is_true(ctx, result)) {
        data->id = GRN_ID_NIL;
      }
    }
  } else {
    data->id = grn_table_add(ctx, data->table, NULL, 0, NULL);
  }
  return data->id;
}

static void
grn_loader_brace_add_weight_vector_element(grn_ctx *ctx,
                                           grn_loader *loader,
                                           grn_loader_add_record_data *data,
                                           grn_obj *vector,
                                           grn_obj *brace_value)
{
  grn_obj weight_buffer;
  GRN_FLOAT32_INIT(&weight_buffer, 0);

  grn_obj *value = brace_value + 1;
  grn_obj *value_end = value + GRN_UINT32_VALUE(brace_value);
  for (; value < value_end; value = values_next(ctx, value)) {
    grn_obj *key = value;
    if (value >= value_end) {
      /* TODO: Report no weight error. */
      break;
    }
    value = values_next(ctx, value);
    grn_obj *weight = value;

    GRN_BULK_REWIND(&weight_buffer);
    grn_rc rc = grn_obj_cast(ctx, weight, &weight_buffer, true);
    if (rc != GRN_SUCCESS) {
      grn_obj *range;
      range = grn_ctx_at(ctx, weight_buffer.header.domain);
      ERR_CAST(data->current.column, range, weight);
      grn_obj_unlink(ctx, range);
      break;
    }
    grn_vector_add_element_float(ctx,
                                 vector,
                                 GRN_BULK_HEAD(key),
                                 (uint32_t)GRN_BULK_VSIZE(key),
                                 GRN_FLOAT32_VALUE(&weight_buffer),
                                 key->header.domain);
  }
  GRN_OBJ_FIN(ctx, &weight_buffer);
}

static void
grn_loader_brace_add_record(grn_ctx *ctx,
                            grn_loader *loader,
                            grn_loader_add_record_data *data);

static void
grn_loader_bracket_set_value_reference(grn_ctx *ctx,
                                       grn_loader *loader,
                                       grn_loader_add_record_data *data)
{
  grn_obj *bracket_element = data->current.value;
  grn_obj *element = bracket_element + 1;
  grn_obj *element_end = element + GRN_UINT32_VALUE(bracket_element);

  grn_id range_id = DB_OBJ(data->current.column)->range;
  grn_obj *range = grn_ctx_at(ctx, range_id);

  grn_obj vector;
  GRN_RECORD_INIT(&vector, GRN_OBJ_VECTOR, range_id);
  for (; element < element_end; element = values_next(ctx, element)) {
    if (element->header.domain == GRN_JSON_LOAD_OPEN_BRACE) {
      grn_loader_add_record_data sub_data;
      sub_data.table = range;
      sub_data.depth = data->depth + 1;
      sub_data.record_value = element;
      sub_data.id = GRN_ID_NIL;
      sub_data.key = NULL;
      grn_loader_brace_add_record(ctx, loader, &sub_data);
      if (sub_data.id == GRN_ID_NIL) {
        goto exit;
      }
      GRN_RECORD_PUT(ctx, &vector, sub_data.id);
    } else if (element->header.domain == GRN_JSON_LOAD_OPEN_BRACKET) {
      GRN_DEFINE_NAME(data->table);
      grn_obj inspected;
      GRN_TEXT_INIT(&inspected, 0);
      grn_inspect(ctx, &inspected, element);
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s][%.*s] can't use [...] for reference column: "
          "%.*s",
          name_size,
          name,
          data->current.column_name_size,
          data->current.column_name,
          (int)GRN_TEXT_LEN(&inspected),
          GRN_TEXT_VALUE(&inspected));
      GRN_OBJ_FIN(ctx, &inspected);
      goto exit;
    } else if (element->header.domain == range_id) {
      GRN_RECORD_PUT(ctx, &vector, GRN_RECORD_VALUE(element));
    } else {
      grn_obj values;
      if (grn_obj_is_text_family_bulk(ctx, element)) {
        GRN_TEXT_INIT(&values, GRN_OBJ_VECTOR);
        grn_vector_add_element_float(ctx,
                                     &values,
                                     GRN_TEXT_VALUE(element),
                                     (uint32_t)GRN_TEXT_LEN(element),
                                     0.0,
                                     element->header.domain);
      } else {
        GRN_VALUE_FIX_SIZE_INIT(&values,
                                GRN_OBJ_VECTOR,
                                element->header.domain);
        grn_bulk_write(ctx,
                       &values,
                       GRN_BULK_HEAD(element),
                       GRN_BULK_VSIZE(element));
      }
      grn_obj records;
      GRN_RECORD_INIT(&records, 0, range_id);
      grn_obj *casted_records = grn_column_cast_value(ctx,
                                                      data->current.column,
                                                      &values,
                                                      &records,
                                                      GRN_OBJ_SET);
      if (casted_records) {
        grn_uvector_copy(ctx, &records, &vector);
      }
      GRN_OBJ_FIN(ctx, &values);
      GRN_OBJ_FIN(ctx, &records);
      if (ctx->rc != GRN_SUCCESS) {
        goto exit;
      }
    }
  }

  grn_obj_set_value(ctx, data->current.column, data->id, &vector, GRN_OBJ_SET);

exit:
  grn_obj_unlink(ctx, range);
  GRN_OBJ_FIN(ctx, &vector);
}

static void
grn_loader_bracket_set_value_text(grn_ctx *ctx,
                                  grn_loader *loader,
                                  grn_loader_add_record_data *data)
{
  grn_obj *bracket_element = data->current.value;
  grn_obj *element = bracket_element + 1;
  grn_obj *element_end = element + GRN_UINT32_VALUE(bracket_element);

  grn_id range_id = DB_OBJ(data->current.column)->range;

  grn_obj vector;
  GRN_TEXT_INIT(&vector, GRN_OBJ_VECTOR);
  for (; element < element_end; element = values_next(ctx, element)) {
    if (element->header.domain == GRN_JSON_LOAD_OPEN_BRACE) {
      grn_loader_brace_add_weight_vector_element(ctx,
                                                 loader,
                                                 data,
                                                 &vector,
                                                 element);
      if (ctx->rc != GRN_SUCCESS) {
        goto exit;
      }
    } else if (element->header.domain == GRN_JSON_LOAD_OPEN_BRACKET) {
      GRN_DEFINE_NAME(data->table);
      grn_obj inspected;
      GRN_TEXT_INIT(&inspected, 0);
      grn_inspect(ctx, &inspected, element);
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s][%.*s] "
          "can't use [...] for variable size data column: "
          "%.*s",
          name_size,
          name,
          data->current.column_name_size,
          data->current.column_name,
          (int)GRN_TEXT_LEN(&inspected),
          GRN_TEXT_VALUE(&inspected));
      GRN_OBJ_FIN(ctx, &inspected);
      goto exit;
    } else if (grn_obj_is_text_family_bulk(ctx, element)) {
      grn_vector_add_element(ctx,
                             &vector,
                             GRN_TEXT_VALUE(element),
                             (uint32_t)GRN_TEXT_LEN(element),
                             0,
                             range_id);
    } else {
      grn_obj values;
      GRN_VALUE_FIX_SIZE_INIT(&values, GRN_OBJ_VECTOR, element->header.domain);
      grn_bulk_write(ctx,
                     &values,
                     GRN_BULK_HEAD(element),
                     GRN_BULK_VSIZE(element));
      grn_obj buffer;
      GRN_VOID_INIT(&buffer);
      grn_obj *casted_values = grn_column_cast_value(ctx,
                                                     data->current.column,
                                                     &values,
                                                     &buffer,
                                                     GRN_OBJ_SET);
      if (casted_values) {
        grn_vector_copy(ctx, casted_values, &vector);
      }
      GRN_OBJ_FIN(ctx, &values);
      GRN_OBJ_FIN(ctx, &buffer);
      if (ctx->rc != GRN_SUCCESS) {
        grn_loader_save_error(ctx, loader);
        ERRCLR(ctx);
      }
    }
  }

  grn_obj_set_value(ctx, data->current.column, data->id, &vector, GRN_OBJ_SET);

exit:
  GRN_OBJ_FIN(ctx, &vector);
}

static void
grn_loader_bracket_set_value_fix_size(grn_ctx *ctx,
                                      grn_loader *loader,
                                      grn_loader_add_record_data *data)
{
  grn_obj *bracket_element = data->current.value;
  grn_obj *element = bracket_element + 1;
  grn_obj *element_end = element + GRN_UINT32_VALUE(bracket_element);

  grn_id range_id = DB_OBJ(data->current.column)->range;

  grn_obj vector;
  GRN_VALUE_FIX_SIZE_INIT(&vector, GRN_OBJ_VECTOR, range_id);
  for (; element < element_end; element = values_next(ctx, element)) {
    if (element->header.domain == GRN_JSON_LOAD_OPEN_BRACE ||
        element->header.domain == GRN_JSON_LOAD_OPEN_BRACKET) {
      GRN_DEFINE_NAME(data->table);
      grn_obj inspected;
      GRN_TEXT_INIT(&inspected, 0);
      grn_inspect(ctx, &inspected, element);
      const char *example;
      if (element->header.domain == GRN_JSON_LOAD_OPEN_BRACE) {
        example = "{...}";
      } else {
        example = "[...]";
      }
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s][%.*s] "
          "can't use %s for fixed size data column: "
          "%.*s",
          name_size,
          name,
          data->current.column_name_size,
          data->current.column_name,
          example,
          (int)GRN_TEXT_LEN(&inspected),
          GRN_TEXT_VALUE(&inspected));
      GRN_OBJ_FIN(ctx, &inspected);
      goto exit;
    } else if (element->header.domain == range_id) {
      grn_bulk_write(ctx,
                     &vector,
                     GRN_BULK_HEAD(element),
                     GRN_BULK_VSIZE(element));
    } else {
      grn_obj values;
      if (grn_obj_is_text_family_bulk(ctx, element)) {
        GRN_TEXT_INIT(&values, GRN_OBJ_VECTOR);
        grn_vector_add_element_float(ctx,
                                     &values,
                                     GRN_TEXT_VALUE(element),
                                     (uint32_t)GRN_TEXT_LEN(element),
                                     0.0,
                                     element->header.domain);
      } else {
        GRN_VALUE_FIX_SIZE_INIT(&values,
                                GRN_OBJ_VECTOR,
                                element->header.domain);
        grn_bulk_write(ctx,
                       &values,
                       GRN_BULK_HEAD(element),
                       GRN_BULK_VSIZE(element));
      }
      grn_obj buffer;
      GRN_VOID_INIT(&buffer);
      grn_obj *casted_values = grn_column_cast_value(ctx,
                                                     data->current.column,
                                                     &values,
                                                     &buffer,
                                                     GRN_OBJ_SET);
      if (casted_values) {
        grn_uvector_copy(ctx, casted_values, &vector);
      }
      GRN_OBJ_FIN(ctx, &values);
      GRN_OBJ_FIN(ctx, &buffer);
      if (ctx->rc != GRN_SUCCESS) {
        grn_loader_save_error(ctx, loader);
        ERRCLR(ctx);
      }
    }
  }

  grn_obj_set_value(ctx, data->current.column, data->id, &vector, GRN_OBJ_SET);

exit:
  GRN_OBJ_FIN(ctx, &vector);
}

static void
grn_loader_bracket_set_value(grn_ctx *ctx,
                             grn_loader *loader,
                             grn_loader_add_record_data *data)
{
  if (!grn_obj_is_vector_column(ctx, data->current.column)) {
    GRN_DEFINE_NAME(data->table);
    ERR(GRN_INVALID_ARGUMENT,
        "[table][load][%.*s][%.*s] [...] is only for vector column",
        name_size,
        name,
        (int)(data->current.column_name_size),
        data->current.column_name);
    return;
  }

  grn_id range_id = DB_OBJ(data->current.column)->range;
  if (grn_id_maybe_table(ctx, range_id)) {
    grn_loader_bracket_set_value_reference(ctx, loader, data);
  } else if (grn_type_id_is_text_family(ctx, range_id)) {
    grn_loader_bracket_set_value_text(ctx, loader, data);
  } else {
    grn_loader_bracket_set_value_fix_size(ctx, loader, data);
  }
}

static void
grn_loader_brace_set_value(grn_ctx *ctx,
                           grn_loader *loader,
                           grn_loader_add_record_data *data)
{
  if (grn_obj_is_weight_vector_column(ctx, data->current.column)) {
    grn_obj vector;
    GRN_TEXT_INIT(&vector, GRN_OBJ_VECTOR);
    grn_loader_brace_add_weight_vector_element(ctx,
                                               loader,
                                               data,
                                               &vector,
                                               data->current.value);
    if (ctx->rc == GRN_SUCCESS) {
      grn_obj_set_value(ctx,
                        data->current.column,
                        data->id,
                        &vector,
                        GRN_OBJ_SET);
    }
    GRN_OBJ_FIN(ctx, &vector);
  } else if (grn_obj_is_reference_column(ctx, data->current.column) &&
             !grn_obj_is_vector_column(ctx, data->current.column)) {
    grn_id range_id = DB_OBJ(data->current.column)->range;
    grn_loader_add_record_data sub_data;
    sub_data.table = grn_ctx_at(ctx, range_id);
    sub_data.depth = data->depth + 1;
    sub_data.record_value = data->current.value;
    sub_data.id = GRN_ID_NIL;
    sub_data.key = NULL;
    grn_loader_brace_add_record(ctx, loader, &sub_data);
    if (sub_data.id != GRN_ID_NIL) {
      grn_obj record;
      GRN_RECORD_INIT(&record, 0, range_id);
      GRN_RECORD_SET(ctx, &record, sub_data.id);
      grn_obj_set_value(ctx,
                        data->current.column,
                        data->id,
                        &record,
                        GRN_OBJ_SET);
      GRN_OBJ_FIN(ctx, &record);
    }
    grn_obj_unlink(ctx, sub_data.table);
  } else {
    GRN_DEFINE_NAME(data->table);
    ERR(GRN_INVALID_ARGUMENT,
        "[table][load][%.*s][%.*s] {...} is only for "
        "weight vector column or reference column",
        name_size,
        name,
        (int)(data->current.column_name_size),
        data->current.column_name);
  }
}

static inline int
name_equal(const char *p, size_t size, const char *name)
{
  if (strlen(name) != size) {
    return 0;
  }
  if (*p != GRN_DB_PSEUDO_COLUMN_PREFIX) {
    return 0;
  }
  return !memcmp(p + 1, name + 1, size - 1);
}

static void
grn_loader_brace_set_values(grn_ctx *ctx,
                            grn_loader *loader,
                            grn_loader_add_record_data *data)
{
  grn_obj *brace_value = data->record_value;
  grn_obj *value = brace_value + 1;
  grn_obj *value_end = value + GRN_UINT32_VALUE(brace_value);

  for (; value < value_end; value = values_next(ctx, value)) {
    const char *name = data->current.column_name = GRN_TEXT_VALUE(value);
    size_t name_size = GRN_TEXT_LEN(value);
    data->current.column_name_size = (uint32_t)name_size;
    value++;
    data->current.value = value;
    if (name_equal(name, name_size, GRN_COLUMN_NAME_ID) ||
        name_equal(name, name_size, GRN_COLUMN_NAME_KEY)) {
      /* Skip _id and _key, because it's already used to get id. */
      continue;
    }
    grn_obj *column = data->current.column =
      grn_obj_column(ctx, data->table, name, (uint32_t)name_size);
    if (!column) {
      GRN_DEFINE_NAME(data->table);
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s] nonexistent column: <%.*s>",
          (int)name_size,
          name,
          (int)(data->current.column_name_size),
          data->current.column_name);
      grn_loader_on_column_set(ctx, loader, data);
      continue;
      /* Automatic column creation is disabled. */
      /*
      if (value->header.domain == GRN_JSON_LOAD_OPEN_BRACKET) {
        grn_obj *v = value + 1;
        col = grn_column_create(ctx, loader->table, name, name_size,
                                NULL, GRN_OBJ_PERSISTENT|GRN_OBJ_COLUMN_VECTOR,
                                grn_ctx_at(ctx, v->header.domain));
      } else {
        col = grn_column_create(ctx, loader->table, name, name_size,
                                NULL, GRN_OBJ_PERSISTENT,
                                grn_ctx_at(ctx, value->header.domain));
      }
      */
    }

    if (value->header.domain == GRN_JSON_LOAD_OPEN_BRACKET) {
      grn_loader_bracket_set_value(ctx, loader, data);
    } else if (value->header.domain == GRN_JSON_LOAD_OPEN_BRACE) {
      grn_loader_brace_set_value(ctx, loader, data);
    } else {
      grn_obj_set_value(ctx, column, data->id, value, GRN_OBJ_SET);
    }
    grn_loader_on_column_set(ctx, loader, data);
    grn_obj_unlink(ctx, column);
  }
}

static void
grn_loader_parse_id_value(grn_ctx *ctx,
                          grn_loader *loader,
                          grn_loader_add_record_data *data,
                          grn_obj *value)
{
  switch (value->header.type) {
  case GRN_DB_UINT32:
    data->id = GRN_UINT32_VALUE(value);
    break;
  case GRN_DB_INT32:
    data->id = (grn_id)GRN_INT32_VALUE(value);
    break;
  default:
    {
      grn_obj casted_value;
      GRN_UINT32_INIT(&casted_value, 0);
      if (grn_obj_cast(ctx, value, &casted_value, false) != GRN_SUCCESS) {
        GRN_DEFINE_NAME(data->table);
        grn_obj inspected;
        GRN_TEXT_INIT(&inspected, 0);
        grn_inspect(ctx, &inspected, value);
        ERR(GRN_INVALID_ARGUMENT,
            "[table][load][%.*s][%s] failed to cast to <UInt32>: <%.*s>",
            name_size,
            name,
            GRN_COLUMN_NAME_ID,
            (int)GRN_TEXT_LEN(&inspected),
            GRN_TEXT_VALUE(&inspected));
        GRN_OBJ_FIN(ctx, &inspected);
      } else {
        data->id = GRN_UINT32_VALUE(&casted_value);
      }
      GRN_OBJ_FIN(ctx, &casted_value);
      break;
    }
  }
}

static inline void
grn_loader_brace_add_record_internal(grn_ctx *ctx,
                                     grn_loader *loader,
                                     grn_loader_add_record_data *data)
{
  grn_obj *brace_value = data->record_value;
  grn_obj *value = brace_value + 1;
  grn_obj *value_end = value + GRN_UINT32_VALUE(brace_value);
  grn_obj *id_bulk = NULL;
  grn_obj *key = NULL;

  /* Scan values to find _id or _key. */
  for (; value < value_end; value = values_next(ctx, value)) {
    if (!grn_obj_is_text_family_bulk(ctx, value)) {
      GRN_DEFINE_NAME(data->table);
      grn_obj inspected;
      GRN_TEXT_INIT(&inspected, 0);
      grn_inspect(ctx, &inspected, value);
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s] column name must be string: <%.*s>",
          name_size,
          name,
          (int)GRN_TEXT_LEN(&inspected),
          GRN_TEXT_VALUE(&inspected));
      GRN_OBJ_FIN(ctx, &inspected);
      return;
    }

    const char *name = GRN_TEXT_VALUE(value);
    size_t name_size = GRN_TEXT_LEN(value);
    value = values_next(ctx, value);
    if (name_equal(name, name_size, GRN_COLUMN_NAME_ID)) {
      if (id_bulk || key) {
        if (data->table->header.type == GRN_TABLE_NO_KEY) {
          GRN_DEFINE_NAME(data->table);
          ERR(GRN_INVALID_ARGUMENT,
              "[table][load][%.*s] duplicated <%s> columns",
              name_size,
              name,
              GRN_COLUMN_NAME_ID);
          return;
        } else {
          GRN_DEFINE_NAME(data->table);
          ERR(GRN_INVALID_ARGUMENT,
              "[table][load][%.*s] duplicated identifier columns: <%s>:<%s>",
              name_size,
              name,
              id_bulk ? GRN_COLUMN_NAME_ID : GRN_COLUMN_NAME_KEY,
              GRN_COLUMN_NAME_ID);
          return;
        }
      }
      id_bulk = value;
    } else if (name_equal(name, name_size, GRN_COLUMN_NAME_KEY)) {
      if (data->table->header.type == GRN_TABLE_NO_KEY) {
        GRN_DEFINE_NAME(data->table);
        ERR(GRN_INVALID_ARGUMENT,
            "[table][load][%.*s] TABLE_NO_KEY doesn't accept <%s> column",
            name_size,
            name,
            GRN_COLUMN_NAME_KEY);
        return;
      }
      if (id_bulk || key) {
        GRN_DEFINE_NAME(data->table);
        ERR(GRN_INVALID_ARGUMENT,
            "[table][load][%.*s] duplicated identifier columns: <%s>:<%s>",
            name_size,
            name,
            id_bulk ? GRN_COLUMN_NAME_ID : GRN_COLUMN_NAME_KEY,
            GRN_COLUMN_NAME_KEY);
        return;
      }
      key = value;
    }
  }

  switch (data->table->header.type) {
  case GRN_TABLE_HASH_KEY:
  case GRN_TABLE_PAT_KEY:
  case GRN_TABLE_DAT_KEY:
    /* The target table requires _id or _key. */
    if (!id_bulk && !key) {
      grn_loader_on_no_identifier_error(ctx, loader, data->table);
      return;
    }
    break;
  default:
    break;
  }

  if (id_bulk) {
    grn_loader_parse_id_value(ctx, loader, data, id_bulk);
    if (ctx->rc != GRN_SUCCESS) {
      return;
    }
  } else if (key) {
    data->key = key;
  }
  grn_loader_add_record(ctx, loader, data);
  if (data->id == GRN_ID_NIL) {
    /* Target record is not available. */
    return;
  }

  /* TODO: support recursive lock */
  if (data->depth == 0 && loader->lock_table) {
    GRN_TABLE_LOCK_BEGIN(ctx, data->table)
    {
      if (grn_table_at(ctx, data->table, data->id) == data->id) {
        grn_loader_brace_set_values(ctx, loader, data);
        if (data->depth == 0) {
          grn_loader_apply_each(ctx, loader, data->id);
        }
      } else {
        data->id = GRN_ID_NIL;
      }
    }
    GRN_TABLE_LOCK_END(ctx);
  } else {
    grn_loader_brace_set_values(ctx, loader, data);
    if (data->depth == 0) {
      grn_loader_apply_each(ctx, loader, data->id);
    }
  }

  return;
}

static void
grn_loader_brace_add_record(grn_ctx *ctx,
                            grn_loader *loader,
                            grn_loader_add_record_data *data)
{
  GRN_SLOW_LOG_PUSH(ctx, GRN_LOG_DEBUG);
  grn_loader_brace_add_record_internal(ctx, loader, data);
  GRN_SLOW_LOG_POP_BEGIN(ctx, GRN_LOG_DEBUG, elapsed_time)
  {
    GRN_DEFINE_NAME(loader->table);
    GRN_LOG(ctx,
            GRN_LOG_DEBUG,
            "[loader][brace][add-record][slow][%f] "
            "<%.*s>(%u)",
            elapsed_time,
            name_size,
            name,
            data->id);
  }
  GRN_SLOW_LOG_POP_END(ctx);
}

void
grn_loader_apply_each(grn_ctx *ctx, grn_loader *loader, grn_id id)
{
  grn_obj *var;

  if (!loader->each) {
    return;
  }

  var = grn_expr_get_var_by_offset(ctx, loader->each, 0);
  GRN_RECORD_SET(ctx, var, id);
  grn_expr_exec(ctx, loader->each, 0);
}

static void
grn_loader_bracket_set_columns(grn_ctx *ctx,
                               grn_loader *loader,
                               grn_obj *bracket_value)
{
  grn_obj *value = bracket_value + 1;
  grn_obj *value_end = value + GRN_UINT32_VALUE(bracket_value);
  uint32_t i = 0;
  for (; value < value_end; value = values_next(ctx, value), i++) {
    if (!grn_obj_is_text_family_bulk(ctx, value)) {
      GRN_DEFINE_NAME(loader->table);
      grn_obj inspected;
      GRN_TEXT_INIT(&inspected, 0);
      grn_inspect(ctx, &inspected, value);
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s] column name must be string: <%.*s>",
          name_size,
          name,
          (int)GRN_TEXT_LEN(&inspected),
          GRN_TEXT_VALUE(&inspected));
      grn_loader_save_error(ctx, loader);
      GRN_OBJ_FIN(ctx, &inspected);
      loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
      return;
    }

    const char *column_name = GRN_TEXT_VALUE(value);
    size_t column_name_size = GRN_TEXT_LEN(value);
    if (name_equal(column_name, column_name_size, GRN_COLUMN_NAME_ID)) {
      if (loader->id_offset != -1 || loader->key_offset != -1) {
        /* _id and _key must not appear more than once. */
        if (loader->table->header.type == GRN_TABLE_NO_KEY) {
          GRN_DEFINE_NAME(loader->table);
          ERR(GRN_INVALID_ARGUMENT,
              "[table][load][%.*s] duplicated <%s> columns: %d and %d",
              name_size,
              name,
              GRN_COLUMN_NAME_ID,
              loader->id_offset,
              i);
        } else {
          GRN_DEFINE_NAME(loader->table);
          ERR(GRN_INVALID_ARGUMENT,
              "[table][load][%.*s] duplicated identifier columns: <%s>:<%s>",
              name_size,
              name,
              loader->id_offset != -1 ? GRN_COLUMN_NAME_ID
                                      : GRN_COLUMN_NAME_KEY,
              GRN_COLUMN_NAME_ID);
        }
        grn_loader_save_error(ctx, loader);
        loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
        return;
      }
      loader->id_offset = (int32_t)i;
    } else if (name_equal(column_name, column_name_size, GRN_COLUMN_NAME_KEY)) {
      if (loader->table->header.type == GRN_TABLE_NO_KEY) {
        GRN_DEFINE_NAME(loader->table);
        ERR(GRN_INVALID_ARGUMENT,
            "[table][load][%.*s] TABLE_NO_KEY doesn't accept <%s> column",
            name_size,
            name,
            GRN_COLUMN_NAME_KEY);
        grn_loader_save_error(ctx, loader);
        loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
        return;
      }
      if (loader->id_offset != -1 || loader->key_offset != -1) {
        /* _id and _key must not appear more than once. */
        GRN_DEFINE_NAME(loader->table);
        ERR(GRN_INVALID_ARGUMENT,
            "[table][load][%.*s] duplicated identifier columns: <%s>:<%s>",
            name_size,
            name,
            loader->id_offset != -1 ? GRN_COLUMN_NAME_ID : GRN_COLUMN_NAME_KEY,
            GRN_COLUMN_NAME_KEY);
        grn_loader_save_error(ctx, loader);
        loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
        return;
      }
      loader->key_offset = (int32_t)i;
    }
    grn_obj *column =
      grn_loader_get_column(ctx, loader, column_name, column_name_size);
    if (!column) {
      GRN_DEFINE_NAME(loader->table);
      ERR(GRN_INVALID_ARGUMENT,
          "[table][load][%.*s] nonexistent column: <%.*s>",
          name_size,
          name,
          (int)column_name_size,
          column_name);
      grn_loader_save_error(ctx, loader);
      loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
      return;
    }
  }

  switch (loader->table->header.type) {
  case GRN_TABLE_HASH_KEY:
  case GRN_TABLE_PAT_KEY:
  case GRN_TABLE_DAT_KEY:
    if (loader->id_offset == -1 && loader->key_offset == -1) {
      grn_loader_on_no_identifier_error(ctx, loader, loader->table);
      grn_loader_save_error(ctx, loader);
      loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
      return;
    }
    break;
  default:
    break;
  }

  loader->columns_status = GRN_LOADER_COLUMNS_SET;
}

static void
grn_loader_bracket_set_values(grn_ctx *ctx,
                              grn_loader *loader,
                              grn_loader_add_record_data *data)
{
  grn_obj *bracket_value = data->record_value;
  grn_obj *value = bracket_value + 1;
  grn_obj *value_end = value + GRN_UINT32_VALUE(bracket_value);
  int32_t i = 0;
  GRN_HASH_EACH_BEGIN(ctx, loader->columns, cursor, cursor_id)
  {
    if (value >= value_end) {
      break;
    }

    if (i == loader->id_offset || i == loader->key_offset) {
      i++;
      value = values_next(ctx, value);
      continue;
    }

    void *cursor_value;
    grn_hash_cursor_get_value(ctx, cursor, &cursor_value);
    data->current.column = *((grn_obj **)cursor_value);
    GRN_DEFINE_NAME(data->current.column);
    const char *column_only_name = name;
    for (; column_only_name < name + name_size; column_only_name++) {
      if (column_only_name[0] == '.') {
        column_only_name++;
        break;
      }
    }
    data->current.column_name = column_only_name;
    data->current.column_name_size =
      (uint32_t)(name_size - (column_only_name - name));
    data->current.value = value;

    if (value->header.domain == GRN_JSON_LOAD_OPEN_BRACKET) {
      grn_loader_bracket_set_value(ctx, loader, data);
    } else if (value->header.domain == GRN_JSON_LOAD_OPEN_BRACE) {
      grn_loader_brace_set_value(ctx, loader, data);
    } else {
      grn_obj_set_value(ctx,
                        data->current.column,
                        data->id,
                        value,
                        GRN_OBJ_SET);
    }
    grn_loader_on_column_set(ctx, loader, data);

    i++;
    value = values_next(ctx, value);
  }
  GRN_HASH_EACH_END(ctx, cursor);
}

static inline void
grn_loader_bracket_add_record_internal(grn_ctx *ctx,
                                       grn_loader *loader,
                                       grn_loader_add_record_data *data)
{
  grn_obj *bracket_value = data->record_value;
  uint32_t n_values = grn_loader_bracket_count(ctx, bracket_value);
  if (n_values == 0) {
    switch (loader->table->header.type) {
    case GRN_TABLE_NO_KEY:
      /*
       * Accept empty arrays because a dump command may output a load command
       * which contains empty arrays for a table with deleted records.
       */
      data->id = grn_table_add(ctx, loader->table, NULL, 0, NULL);
      return;
    default:
      grn_loader_on_no_identifier_error(ctx, loader, data->table);
      return;
    }
  }

  uint32_t expected_n_values = grn_hash_size(ctx, loader->columns);
  if (n_values != expected_n_values) {
    GRN_DEFINE_NAME(data->table);
    ERR(GRN_INVALID_ARGUMENT,
        "[table][load][%*.s] "
        "unexpected the number of values: expected:%u, actual:%u",
        name_size,
        name,
        expected_n_values,
        n_values);
    return;
  }

  grn_obj *value = bracket_value + 1;
  if (loader->id_offset != -1) {
    grn_obj *id_bulk =
      grn_loader_bracket_get(ctx, bracket_value, (uint32_t)(loader->id_offset));
    grn_loader_parse_id_value(ctx, loader, data, id_bulk);
    if (ctx->rc != GRN_SUCCESS) {
      return;
    }
  } else if (loader->key_offset != -1) {
    data->key = value + loader->key_offset;
  }
  grn_loader_add_record(ctx, loader, data);
  if (data->id == GRN_ID_NIL) {
    /* Target record is not available. */
    return;
  }

  /* TODO: support recursive lock */
  if (data->depth == 0 && loader->lock_table) {
    GRN_TABLE_LOCK_BEGIN(ctx, data->table)
    {
      if (grn_table_at(ctx, data->table, data->id) == data->id) {
        grn_loader_bracket_set_values(ctx, loader, data);
        if (data->depth == 0) {
          grn_loader_apply_each(ctx, loader, data->id);
        }
      }
    }
    GRN_TABLE_LOCK_END(ctx);
  } else {
    grn_loader_bracket_set_values(ctx, loader, data);
    if (data->depth == 0) {
      grn_loader_apply_each(ctx, loader, data->id);
    }
  }
}

static void
grn_loader_bracket_add_record(grn_ctx *ctx,
                              grn_loader *loader,
                              grn_loader_add_record_data *data)
{
  GRN_SLOW_LOG_PUSH(ctx, GRN_LOG_DEBUG);
  grn_loader_bracket_add_record_internal(ctx, loader, data);
  GRN_SLOW_LOG_POP_BEGIN(ctx, GRN_LOG_DEBUG, elapsed_time)
  {
    GRN_DEFINE_NAME(loader->table);
    GRN_LOG(ctx,
            GRN_LOG_DEBUG,
            "[loader][bracket][add-record][slow][%f] "
            "<%.*s>(%u)",
            elapsed_time,
            name_size,
            name,
            data->id);
  }
  GRN_SLOW_LOG_POP_END(ctx);
}

static void
bracket_close(grn_ctx *ctx, grn_loader *loader)
{
  uint32_t begin;
  GRN_UINT32_POP(&loader->level, begin);
  grn_obj *values = (grn_obj *)GRN_TEXT_VALUE(&loader->values);
  grn_obj *bracket_value = values + begin;
  GRN_ASSERT(bracket_value->header.domain == GRN_JSON_LOAD_OPEN_BRACKET);
  GRN_UINT32_SET(ctx, bracket_value, loader->values_size - begin - 1);
  size_t depth = GRN_UINT32_VECTOR_SIZE(&(loader->level));
  if (depth > loader->emit_level) {
    return;
  }

  if (depth == 0 || !loader->table ||
      loader->columns_status == GRN_LOADER_COLUMNS_BROKEN) {
    goto exit;
  }

  if (loader->columns_status == GRN_LOADER_COLUMNS_UNSET) {
    /*
     * Target columns and _id or _key are not specified yet and values are
     * handled as column names and "_id" or "_key".
     */
    grn_loader_bracket_set_columns(ctx, loader, bracket_value);
    goto exit;
  }

  grn_loader_add_record_data data;
  data.table = loader->table;
  data.depth = 0;
  data.record_value = bracket_value;
  data.id = GRN_ID_NIL;
  data.key = NULL;
  grn_loader_bracket_add_record(ctx, loader, &data);
  grn_loader_on_record_added(ctx, loader, data.id);

exit:
  loader->values_size = begin;
  ERRCLR(ctx);
}

static void
brace_close(grn_ctx *ctx, grn_loader *loader)
{
  uint32_t begin;
  GRN_UINT32_POP(&loader->level, begin);
  grn_obj *values = (grn_obj *)GRN_TEXT_VALUE(&loader->values);
  grn_obj *brace_value = values + begin;
  GRN_ASSERT(brace_value->header.domain == GRN_JSON_LOAD_OPEN_BRACE);
  GRN_UINT32_SET(ctx, brace_value, loader->values_size - begin - 1);
  size_t depth = GRN_UINT32_VECTOR_SIZE(&(loader->level));
  if (depth > loader->emit_level) {
    return;
  }

  grn_id id = GRN_ID_NIL;
  if (loader->table) {
    grn_loader_add_record_data data;
    data.table = loader->table;
    data.depth = 0;
    data.record_value = brace_value;
    data.id = GRN_ID_NIL;
    data.key = NULL;
    grn_loader_brace_add_record(ctx, loader, &data);
    id = data.id;
  }
  grn_loader_on_record_added(ctx, loader, id);
  loader->values_size = begin;
  ERRCLR(ctx);
}

#define JSON_READ_OPEN_BRACKET()                                               \
  do {                                                                         \
    GRN_UINT32_PUT(ctx, &loader->level, loader->values_size);                  \
    values_add(ctx, loader);                                                   \
    loader->last->header.domain = GRN_JSON_LOAD_OPEN_BRACKET;                  \
    loader->stat = GRN_LOADER_TOKEN;                                           \
    str++;                                                                     \
  } while (0)

#define JSON_READ_OPEN_BRACE()                                                 \
  do {                                                                         \
    GRN_UINT32_PUT(ctx, &loader->level, loader->values_size);                  \
    values_add(ctx, loader);                                                   \
    loader->last->header.domain = GRN_JSON_LOAD_OPEN_BRACE;                    \
    loader->stat = GRN_LOADER_TOKEN;                                           \
    str++;                                                                     \
  } while (0)

static void
json_read(grn_ctx *ctx, grn_loader *loader, const char *str, size_t str_len)
{
  const char *const beg = str;
  char c;
  int len;
  const char *se = str + str_len;
  while (str < se) {
    c = *str;
    switch (loader->stat) {
    case GRN_LOADER_BEGIN:
      if ((len = grn_isspace(str, ctx->encoding))) {
        str += len;
        continue;
      }
      switch (c) {
      case '[':
        JSON_READ_OPEN_BRACKET();
        break;
      case '{':
        JSON_READ_OPEN_BRACE();
        break;
      default:
        ERR(GRN_INVALID_ARGUMENT,
            "JSON must start with '[' or '{': <%.*s>",
            (int)str_len,
            beg);
        loader->stat = GRN_LOADER_END;
        break;
      }
      break;
    case GRN_LOADER_TOKEN:
      if ((len = grn_isspace(str, ctx->encoding))) {
        str += len;
        continue;
      }
      switch (c) {
      case '"':
        loader->stat = GRN_LOADER_STRING;
        values_add(ctx, loader);
        str++;
        break;
      case '[':
        JSON_READ_OPEN_BRACKET();
        break;
      case '{':
        JSON_READ_OPEN_BRACE();
        break;
      case ':':
        str++;
        break;
      case ',':
        str++;
        break;
      case ']':
        bracket_close(ctx, loader);
        loader->stat =
          GRN_BULK_VSIZE(&loader->level) ? GRN_LOADER_TOKEN : GRN_LOADER_END;
        if (ctx->rc == GRN_CANCEL) {
          loader->stat = GRN_LOADER_END;
        }
        str++;
        break;
      case '}':
        brace_close(ctx, loader);
        loader->stat =
          GRN_BULK_VSIZE(&loader->level) ? GRN_LOADER_TOKEN : GRN_LOADER_END;
        if (ctx->rc == GRN_CANCEL) {
          loader->stat = GRN_LOADER_END;
        }
        str++;
        break;
      case '+':
      case '-':
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        loader->stat = GRN_LOADER_NUMBER;
        values_add(ctx, loader);
        break;
      default:
        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('_' == c)) {
          loader->stat = GRN_LOADER_SYMBOL;
          values_add(ctx, loader);
        } else {
          if ((len = grn_charlen(ctx, str, se))) {
            GRN_LOG(ctx, GRN_LOG_ERROR, "ignored invalid char('%c') at", c);
            GRN_LOG(ctx, GRN_LOG_ERROR, "%.*s", (int)(str - beg) + len, beg);
            GRN_LOG(ctx, GRN_LOG_ERROR, "%*s", (int)(str - beg) + 1, "^");
            str += len;
          } else {
            GRN_LOG(ctx,
                    GRN_LOG_ERROR,
                    "ignored invalid char(\\x%.2x) after",
                    c);
            GRN_LOG(ctx, GRN_LOG_ERROR, "%.*s", (int)(str - beg), beg);
            str = se;
          }
        }
        break;
      }
      break;
    case GRN_LOADER_SYMBOL:
      if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') ||
          ('0' <= c && c <= '9') || ('_' == c)) {
        GRN_TEXT_PUTC(ctx, loader->last, c);
        str++;
      } else {
        char *v = GRN_TEXT_VALUE(loader->last);
        switch (*v) {
        case 'n':
          if (GRN_TEXT_LEN(loader->last) == 4 && !memcmp(v, "null", 4)) {
            loader->last->header.domain = GRN_DB_VOID;
            GRN_BULK_REWIND(loader->last);
          }
          break;
        case 't':
          if (GRN_TEXT_LEN(loader->last) == 4 && !memcmp(v, "true", 4)) {
            loader->last->header.domain = GRN_DB_BOOL;
            GRN_BOOL_SET(ctx, loader->last, true);
          }
          break;
        case 'f':
          if (GRN_TEXT_LEN(loader->last) == 5 && !memcmp(v, "false", 5)) {
            loader->last->header.domain = GRN_DB_BOOL;
            GRN_BOOL_SET(ctx, loader->last, false);
          }
          break;
        default:
          break;
        }
        loader->stat =
          GRN_BULK_VSIZE(&loader->level) ? GRN_LOADER_TOKEN : GRN_LOADER_END;
      }
      break;
    case GRN_LOADER_NUMBER:
      switch (c) {
      case '+':
      case '-':
      case '.':
      case 'e':
      case 'E':
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        GRN_TEXT_PUTC(ctx, loader->last, c);
        str++;
        break;
      default:
        {
          const char *cur, *str = GRN_BULK_HEAD(loader->last);
          const char *str_end = GRN_BULK_CURR(loader->last);
          int64_t i = grn_atoll(str, str_end, &cur);
          if (cur == str_end) {
            loader->last->header.domain = GRN_DB_INT64;
            GRN_INT64_SET(ctx, loader->last, i);
          } else if (cur != str) {
            uint64_t i = grn_atoull(str, str_end, &cur);
            if (cur == str_end) {
              loader->last->header.domain = GRN_DB_UINT64;
              GRN_UINT64_SET(ctx, loader->last, i);
            } else if (cur != str) {
              double d;
              char *end;
              grn_obj buf;
              GRN_TEXT_INIT(&buf, 0);
              GRN_TEXT_PUT(ctx, &buf, str, GRN_BULK_VSIZE(loader->last));
              GRN_TEXT_PUTC(ctx, &buf, '\0');
              errno = 0;
              d = strtod(GRN_TEXT_VALUE(&buf), &end);
              if (!errno && end + 1 == GRN_BULK_CURR(&buf)) {
                loader->last->header.domain = GRN_DB_FLOAT;
                GRN_FLOAT_SET(ctx, loader->last, d);
              }
              GRN_OBJ_FIN(ctx, &buf);
            }
          }
        }
        loader->stat =
          GRN_BULK_VSIZE(&loader->level) ? GRN_LOADER_TOKEN : GRN_LOADER_END;
        break;
      }
      break;
    case GRN_LOADER_STRING:
      switch (c) {
      case '\\':
        loader->stat = GRN_LOADER_STRING_ESC;
        str++;
        break;
      case '"':
        str++;
        loader->stat =
          GRN_BULK_VSIZE(&loader->level) ? GRN_LOADER_TOKEN : GRN_LOADER_END;
        /*
        *(GRN_BULK_CURR(loader->last)) = '\0';
        GRN_LOG(ctx, GRN_LOG_ALERT, "read str(%s)",
        GRN_TEXT_VALUE(loader->last));
        */
        break;
      default:
        if ((len = grn_charlen(ctx, str, se))) {
          GRN_TEXT_PUT(ctx, loader->last, str, len);
          str += len;
        } else {
          GRN_LOG(ctx, GRN_LOG_ERROR, "ignored invalid char(\\x%.2x) after", c);
          GRN_LOG(ctx, GRN_LOG_ERROR, "%.*s", (int)(str - beg), beg);
          str = se;
        }
        break;
      }
      break;
    case GRN_LOADER_STRING_ESC:
      switch (c) {
      case 'b':
        GRN_TEXT_PUTC(ctx, loader->last, '\b');
        loader->stat = GRN_LOADER_STRING;
        break;
      case 'f':
        GRN_TEXT_PUTC(ctx, loader->last, '\f');
        loader->stat = GRN_LOADER_STRING;
        break;
      case 'n':
        GRN_TEXT_PUTC(ctx, loader->last, '\n');
        loader->stat = GRN_LOADER_STRING;
        break;
      case 'r':
        GRN_TEXT_PUTC(ctx, loader->last, '\r');
        loader->stat = GRN_LOADER_STRING;
        break;
      case 't':
        GRN_TEXT_PUTC(ctx, loader->last, '\t');
        loader->stat = GRN_LOADER_STRING;
        break;
      case 'u':
        loader->stat = GRN_LOADER_UNICODE0;
        break;
      default:
        GRN_TEXT_PUTC(ctx, loader->last, c);
        loader->stat = GRN_LOADER_STRING;
        break;
      }
      str++;
      break;
    case GRN_LOADER_UNICODE0:
      switch (c) {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        loader->unichar = (uint32_t)((c - '0') * 0x1000);
        break;
      case 'a':
      case 'b':
      case 'c':
      case 'd':
      case 'e':
      case 'f':
        loader->unichar = (uint32_t)((c - 'a' + 10) * 0x1000);
        break;
      case 'A':
      case 'B':
      case 'C':
      case 'D':
      case 'E':
      case 'F':
        loader->unichar = (uint32_t)((c - 'A' + 10) * 0x1000);
        break;
      default:; // todo : error
      }
      loader->stat = GRN_LOADER_UNICODE1;
      str++;
      break;
    case GRN_LOADER_UNICODE1:
      switch (c) {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        loader->unichar += (uint32_t)((c - '0') * 0x100);
        break;
      case 'a':
      case 'b':
      case 'c':
      case 'd':
      case 'e':
      case 'f':
        loader->unichar += (uint32_t)((c - 'a' + 10) * 0x100);
        break;
      case 'A':
      case 'B':
      case 'C':
      case 'D':
      case 'E':
      case 'F':
        loader->unichar += (uint32_t)((c - 'A' + 10) * 0x100);
        break;
      default:; // todo : error
      }
      loader->stat = GRN_LOADER_UNICODE2;
      str++;
      break;
    case GRN_LOADER_UNICODE2:
      switch (c) {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        loader->unichar += (uint32_t)((c - '0') * 0x10);
        break;
      case 'a':
      case 'b':
      case 'c':
      case 'd':
      case 'e':
      case 'f':
        loader->unichar += (uint32_t)((c - 'a' + 10) * 0x10);
        break;
      case 'A':
      case 'B':
      case 'C':
      case 'D':
      case 'E':
      case 'F':
        loader->unichar += (uint32_t)((c - 'A' + 10) * 0x10);
        break;
      default:; // todo : error
      }
      loader->stat = GRN_LOADER_UNICODE3;
      str++;
      break;
    case GRN_LOADER_UNICODE3:
      switch (c) {
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        loader->unichar += (uint32_t)(c - '0');
        break;
      case 'a':
      case 'b':
      case 'c':
      case 'd':
      case 'e':
      case 'f':
        loader->unichar += (uint32_t)(c - 'a' + 10);
        break;
      case 'A':
      case 'B':
      case 'C':
      case 'D':
      case 'E':
      case 'F':
        loader->unichar += (uint32_t)(c - 'A' + 10);
        break;
      default:; // todo : error
      }
      {
        uint32_t u = loader->unichar;
        if (u >= 0xd800 && u <= 0xdbff) { /* High-surrogate code points */
          loader->unichar_hi = u;
          loader->stat = GRN_LOADER_STRING;
          str++;
          break;
        }
        if (u >= 0xdc00 && u <= 0xdfff) { /* Low-surrogate code points */
          u = 0x10000 + (loader->unichar_hi - 0xd800) * 0x400 + u - 0xdc00;
        }
        if (u < 0x80) {
          GRN_TEXT_PUTC(ctx, loader->last, (char)u);
        } else {
          if (u < 0x800) {
            GRN_TEXT_PUTC(ctx, loader->last, (char)((u >> 6) | 0xc0));
          } else {
            if (u < 0x10000) {
              GRN_TEXT_PUTC(ctx, loader->last, (char)((u >> 12) | 0xe0));
            } else {
              GRN_TEXT_PUTC(ctx, loader->last, (char)((u >> 18) | 0xf0));
              GRN_TEXT_PUTC(ctx,
                            loader->last,
                            (char)(((u >> 12) & 0x3f) | 0x80));
            }
            GRN_TEXT_PUTC(ctx, loader->last, (char)(((u >> 6) & 0x3f) | 0x80));
          }
          GRN_TEXT_PUTC(ctx, loader->last, (char)((u & 0x3f) | 0x80));
        }
      }
      loader->stat = GRN_LOADER_STRING;
      str++;
      break;
    case GRN_LOADER_END:
      str = se;
      break;
    }
  }
}

#undef JSON_READ_OPEN_BRACKET
#undef JSON_READ_OPEN_BRACE

/*
 * grn_loader_parse_columns parses a columns parameter.
 * Columns except _id and _key are appended to loader->columns.
 * If it contains _id or _key, loader->id_offset or loader->key_offset is set.
 */
static grn_rc
grn_loader_parse_columns(grn_ctx *ctx,
                         grn_loader *loader,
                         const char *str,
                         unsigned int str_size)
{
  const char *ptr = str, *ptr_end = ptr + str_size, *rest;
  const char *tokens[256], *token_end;
  while (ptr < ptr_end) {
    int i, n = grn_tokenize(ptr, (size_t)(ptr_end - ptr), tokens, 256, &rest);
    for (i = 0; i < n; i++) {
      grn_obj *column;
      token_end = tokens[i];
      while (ptr < token_end && (' ' == *ptr || ',' == *ptr)) {
        ptr++;
      }
      if (name_equal(ptr, (size_t)(token_end - ptr), GRN_COLUMN_NAME_ID)) {
        if (loader->id_offset != -1 || loader->key_offset != -1) {
          /* _id and _key must not appear more than once. */
          if (loader->id_offset != -1) {
            ERR(GRN_INVALID_ARGUMENT,
                "duplicated id and key columns: <%s> at %d and <%s> at %d",
                GRN_COLUMN_NAME_ID,
                i,
                GRN_COLUMN_NAME_ID,
                loader->id_offset);
          } else {
            ERR(GRN_INVALID_ARGUMENT,
                "duplicated id and key columns: <%s> at %d and <%s> at %d",
                GRN_COLUMN_NAME_ID,
                i,
                GRN_COLUMN_NAME_KEY,
                loader->key_offset);
          }
          return ctx->rc;
        }
        loader->id_offset = i;
      } else if (name_equal(ptr,
                            (size_t)(token_end - ptr),
                            GRN_COLUMN_NAME_KEY)) {
        if (loader->id_offset != -1 || loader->key_offset != -1) {
          /* _id and _key must not appear more than once. */
          if (loader->id_offset != -1) {
            ERR(GRN_INVALID_ARGUMENT,
                "duplicated id and key columns: <%s> at %d and <%s> at %d",
                GRN_COLUMN_NAME_KEY,
                i,
                GRN_COLUMN_NAME_ID,
                loader->id_offset);
          } else {
            ERR(GRN_INVALID_ARGUMENT,
                "duplicated id and key columns: <%s> at %d and <%s> at %d",
                GRN_COLUMN_NAME_KEY,
                i,
                GRN_COLUMN_NAME_KEY,
                loader->key_offset);
          }
          return ctx->rc;
        }
        loader->key_offset = i;
      }
      column =
        grn_loader_get_column(ctx, loader, ptr, (size_t)(token_end - ptr));
      if (!column) {
        ERR(GRN_INVALID_ARGUMENT,
            "nonexistent column: <%.*s>",
            (int)(token_end - ptr),
            ptr);
        return ctx->rc;
      }
      ptr = token_end;
    }
    ptr = rest;
  }
  switch (loader->table->header.type) {
  case GRN_TABLE_HASH_KEY:
  case GRN_TABLE_PAT_KEY:
  case GRN_TABLE_DAT_KEY:
    if (loader->id_offset == -1 && loader->key_offset == -1) {
      ERR(GRN_INVALID_ARGUMENT, "missing id or key column");
      return ctx->rc;
    }
    break;
  }
  return ctx->rc;
}

void
grn_load_internal(grn_ctx *ctx, grn_load_input *input)
{
  grn_loader *loader = &ctx->impl->loader;

  loader->emit_level = input->emit_level;
  if (input->table.length > 0) {
    grn_ctx_loader_clear(ctx);
    loader->input_type = input->type;
    if (grn_db_check_name(ctx,
                          input->table.value,
                          (unsigned int)(input->table.length))) {
      GRN_DB_CHECK_NAME_ERR("[table][load]",
                            input->table.value,
                            (int)(input->table.length));
      loader->stat = GRN_LOADER_END;
      return;
    }
    loader->table =
      grn_ctx_get(ctx, input->table.value, (int)(input->table.length));
    if (!loader->table) {
      ERR(GRN_INVALID_ARGUMENT,
          "nonexistent table: <%.*s>",
          (int)(input->table.length),
          input->table.value);
      loader->stat = GRN_LOADER_END;
      return;
    }
    if (input->columns.length > 0) {
      grn_rc rc =
        grn_loader_parse_columns(ctx,
                                 loader,
                                 input->columns.value,
                                 (unsigned int)(input->columns.length));
      if (rc != GRN_SUCCESS) {
        loader->columns_status = GRN_LOADER_COLUMNS_BROKEN;
        loader->stat = GRN_LOADER_END;
        return;
      }
      loader->columns_status = GRN_LOADER_COLUMNS_SET;
    }
    if (input->if_exists.length > 0) {
      grn_obj *v;
      GRN_EXPR_CREATE_FOR_QUERY(ctx, loader->table, loader->ifexists, v);
      if (loader->ifexists && v) {
        grn_expr_parse(ctx,
                       loader->ifexists,
                       input->if_exists.value,
                       (unsigned int)(input->if_exists.length),
                       NULL,
                       GRN_OP_EQUAL,
                       GRN_OP_AND,
                       GRN_EXPR_SYNTAX_SCRIPT | GRN_EXPR_ALLOW_UPDATE);
      }
    }
    if (input->each.length > 0) {
      grn_obj *v;
      GRN_EXPR_CREATE_FOR_QUERY(ctx, loader->table, loader->each, v);
      if (loader->each && v) {
        grn_expr_parse(ctx,
                       loader->each,
                       input->each.value,
                       (unsigned int)(input->each.length),
                       NULL,
                       GRN_OP_EQUAL,
                       GRN_OP_AND,
                       GRN_EXPR_SYNTAX_SCRIPT | GRN_EXPR_ALLOW_UPDATE);
      }
    }
    loader->output_ids = input->output_ids;
    loader->output_errors = input->output_errors;
    loader->lock_table = input->lock_table;
  } else {
    if (!loader->table) {
      ERR(GRN_INVALID_ARGUMENT, "mandatory \"table\" parameter is absent");
      loader->stat = GRN_LOADER_END;
      return;
    }
  }
  switch (loader->input_type) {
  case GRN_CONTENT_JSON:
    json_read(ctx, loader, input->values.value, input->values.length);
    break;
  case GRN_CONTENT_APACHE_ARROW:
#ifdef GRN_WITH_APACHE_ARROW
    if (!ctx->impl->arrow_stream_loader) {
      ctx->impl->arrow_stream_loader =
        grn_arrow_stream_loader_open(ctx, &(ctx->impl->loader));
    }
    grn_arrow_stream_loader_consume(ctx,
                                    ctx->impl->arrow_stream_loader,
                                    input->values.value,
                                    input->values.length);
#else
    ERR(GRN_FUNCTION_NOT_IMPLEMENTED,
        "[load][arrow] Apache Arrow support isn't enabled");
    loader->stat = GRN_LOADER_END;
#endif
    break;
  case GRN_CONTENT_NONE:
  case GRN_CONTENT_TSV:
  case GRN_CONTENT_XML:
  case GRN_CONTENT_MSGPACK:
  case GRN_CONTENT_GROONGA_COMMAND_LIST:
    ERR(GRN_FUNCTION_NOT_IMPLEMENTED, "unsupported input_type");
    loader->stat = GRN_LOADER_END;
    // todo
    break;
  }
}

grn_rc
grn_load(grn_ctx *ctx,
         grn_content_type input_type,
         const char *table,
         unsigned int table_len,
         const char *columns,
         unsigned int columns_len,
         const char *values,
         unsigned int values_len,
         const char *ifexists,
         unsigned int ifexists_len,
         const char *each,
         unsigned int each_len)
{
  if (!ctx || !ctx->impl) {
    ERR(GRN_INVALID_ARGUMENT, "db not initialized");
    return ctx->rc;
  }
  GRN_API_ENTER;
  {
    grn_load_input input;
    input.type = input_type;
    input.table.value = table;
    input.table.length = table_len;
    input.columns.value = columns;
    input.columns.length = columns_len;
    input.values.value = values;
    input.values.length = values_len;
    input.if_exists.value = ifexists;
    input.if_exists.length = ifexists_len;
    input.each.value = each;
    input.each.length = each_len;
    input.output_ids = false;
    input.output_errors = false;
    input.lock_table = false;
    input.emit_level = 1;
    grn_load_internal(ctx, &input);
  }
  GRN_API_RETURN(ctx->rc);
}

void
grn_p_loader(grn_ctx *ctx, grn_loader *loader)
{
  printf("#<loader %p\n", loader);
  grn_obj buffer;
  GRN_TEXT_INIT(&buffer, 0);
  grn_inspect(ctx, &buffer, &(loader->level));
  printf("  levels:%.*s\n",
         (int)GRN_TEXT_LEN(&buffer),
         GRN_TEXT_VALUE(&buffer));
  printf("  values:[\n");
  size_t n_values = GRN_BULK_VSIZE(&(loader->values)) / sizeof(grn_obj);
  size_t i;
  for (i = 0; i < n_values; i++) {
    grn_obj *value = ((grn_obj *)GRN_BULK_HEAD(&(loader->values))) + i;
    GRN_BULK_REWIND(&buffer);
    grn_inspect(ctx, &buffer, value);
    printf("    %" GRN_FMT_SIZE ": %.*s,\n",
           i,
           (int)GRN_TEXT_LEN(&buffer),
           GRN_TEXT_VALUE(&buffer));
  }
  GRN_OBJ_FIN(ctx, &buffer);
  printf("  ]\n");
  printf(">\n");
}
