/*
  Copyright(C) 2015  Brazil
  Copyright(C) 2022  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
*/

#include "../grn_ctx_impl.h"
#include <groonga/command.h>

#ifdef GRN_WITH_MRUBY
#include <mruby.h>
#include <mruby/class.h>
#include <mruby/data.h>
#include <mruby/value.h>
#include <mruby/string.h>

#include "mrb_ctx.h"
#include "mrb_converter.h"
#include "mrb_command_input.h"

static struct mrb_data_type mrb_grn_command_input_type = {
  "Groonga::CommandInput",
  NULL
};

static mrb_value
mrb_grn_command_input_initialize(mrb_state *mrb, mrb_value self)
{
  mrb_value mrb_command_input_ptr;

  mrb_get_args(mrb, "o", &mrb_command_input_ptr);
  DATA_TYPE(self) = &mrb_grn_command_input_type;
  DATA_PTR(self) = mrb_cptr(mrb_command_input_ptr);
  return self;
}

static mrb_value
mrb_grn_command_input_array_reference(mrb_state *mrb, mrb_value self)
{
  grn_ctx *ctx = (grn_ctx *)mrb->ud;
  grn_command_input *input;
  mrb_value mrb_key_or_offset;
  grn_obj *argument;

  input = DATA_PTR(self);
  mrb_get_args(mrb, "o", &mrb_key_or_offset);

  switch (mrb_type(mrb_key_or_offset)) {
  case MRB_TT_INTEGER :
    {
      mrb_int offset = mrb_integer(mrb_key_or_offset);
      argument = grn_command_input_at(ctx, input, (unsigned int)offset);
    }
    break;
  case MRB_TT_SYMBOL :
    {
      mrb_sym mrb_key_symbol;
      const char *key;
      mrb_int key_length;

      mrb_key_symbol = mrb_symbol(mrb_key_or_offset);
      key = mrb_sym2name_len(mrb, mrb_key_symbol, &key_length);
      argument = grn_command_input_get(ctx, input, key, (int)key_length);
    }
    break;
  case MRB_TT_STRING :
    {
      mrb_value mrb_key = mrb_key_or_offset;
      argument = grn_command_input_get(ctx, input,
                                       RSTRING_PTR(mrb_key),
                                       RSTRING_LEN(mrb_key));
    }
    break;
  default :
    mrb_raisef(mrb, E_ARGUMENT_ERROR,
               "must be offset (as integer) or key (as symbol or string): %S",
               mrb_key_or_offset);
    break;
  }

  if (!argument) {
    return mrb_nil_value();
  }

  if (GRN_TEXT_LEN(argument) == 0) {
    return mrb_nil_value();
  }

  return mrb_str_new_static(mrb,
                            GRN_TEXT_VALUE(argument),
                            GRN_TEXT_LEN(argument));
}

static mrb_value
mrb_grn_command_input_get_arguments(mrb_state *mrb, mrb_value self)
{
  grn_ctx *ctx = (grn_ctx *)mrb->ud;
  grn_command_input *input;
  grn_obj *arguments;

  input = DATA_PTR(self);
  arguments = grn_command_input_get_arguments(ctx, input);

  return grn_mrb_value_from_grn_obj(mrb, arguments);
}

void
grn_mrb_command_input_init(grn_ctx *ctx)
{
  grn_mrb_data *data = &(ctx->impl->mrb);
  mrb_state *mrb = data->state;
  struct RClass *module = data->module;
  struct RClass *klass;

  klass = mrb_define_class_under(mrb, module, "CommandInput", mrb->object_class);
  MRB_SET_INSTANCE_TT(klass, MRB_TT_DATA);

  mrb_define_method(mrb, klass, "initialize",
                    mrb_grn_command_input_initialize, MRB_ARGS_REQ(1));

  mrb_define_method(mrb, klass, "[]",
                    mrb_grn_command_input_array_reference, MRB_ARGS_REQ(1));

  mrb_define_method(mrb, klass, "arguments",
                    mrb_grn_command_input_get_arguments, MRB_ARGS_NONE());
}
#endif
