/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *   Copyright 2020-2021 Couchbase, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

#include "query_index_build.hxx"

#include "core/utils/join_strings.hxx"
#include "core/utils/json.hxx"
#include "core/utils/keyspace.hxx"
#include "error_utils.hxx"

#include <tao/json/value.hpp>

namespace couchbase::core::operations::management
{

template<typename Range>
auto
quote_and_join_strings(const Range& values, const std::string& sep) -> std::string
{
  std::stringstream stream;
  auto sentinel = std::end(values);
  if (auto it = std::begin(values); it != sentinel) {
    stream << '`' << *it << '`';
    ++it;
    while (it != sentinel) {
      stream << sep << '`' << *it << '`';
      ++it;
    }
  }
  return stream.str();
}

auto
query_index_build_request::encode_to(encoded_request_type& encoded,
                                     http_context& /* context */) const -> std::error_code
{
  if (!utils::check_query_management_request(*this)) {
    return errc::common::invalid_argument;
  }
  auto keyspace = core::utils::build_keyspace(*this);
  std::string statement =
    fmt::format(R"(BUILD INDEX ON {} ({}))", keyspace, quote_and_join_strings(index_names, ","));
  encoded.headers["content-type"] = "application/json";
  tao::json::value body{ { "statement", statement },
                         { "client_context_id", encoded.client_context_id } };
  if (query_ctx.has_value()) {
    body["query_context"] = query_ctx.value();
  }
  encoded.method = "POST";
  encoded.path = "/query/service";
  encoded.body = utils::json::generate(body);
  return {};
}

auto
query_index_build_request::make_response(error_context::http&& ctx,
                                         const encoded_response_type& encoded) const
  -> query_index_build_response
{
  query_index_build_response response{ std::move(ctx) };
  if (!response.ctx.ec) {
    tao::json::value payload{};
    try {
      payload = utils::json::parse(encoded.body.data());
    } catch (const tao::pegtl::parse_error&) {
      response.ctx.ec = errc::common::parsing_failure;
      return response;
    }
    response.status = payload.at("status").get_string();
    if (response.status != "success") {
      std::optional<std::error_code> common_ec{};
      for (const auto& entry : payload.at("errors").get_array()) {
        query_index_build_response::query_problem error;
        error.code = entry.at("code").get_unsigned();
        error.message = entry.at("msg").get_string();
        response.errors.emplace_back(error);
        common_ec = management::extract_common_query_error_code(error.code, error.message);
      }

      response.ctx.ec =
        common_ec.value_or(extract_common_error_code(encoded.status_code, encoded.body.data()));
    }
  }
  return response;
}
} // namespace couchbase::core::operations::management