/* -*- 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 "view_index_get_all.hxx"

#include "core/utils/json.hxx"
#include "core/utils/url_codec.hxx"
#include "error_utils.hxx"

#include <spdlog/fmt/bundled/core.h>
#include <tao/json/value.hpp>

namespace couchbase::core::operations::management
{
auto
view_index_get_all_request::encode_to(encoded_request_type& encoded,
                                      http_context& /* context */) const -> std::error_code
{
  encoded.method = "GET";
  encoded.path = fmt::format("/pools/default/buckets/{}/ddocs",
                             utils::string_codec::v2::path_escape(bucket_name));
  return {};
}

auto
view_index_get_all_request::make_response(error_context::http&& ctx,
                                          const encoded_response_type& encoded) const
  -> view_index_get_all_response
{
  view_index_get_all_response response{ std::move(ctx) };
  if (!response.ctx.ec) {
    if (encoded.status_code == 200) {
      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;
      }
      auto* rows = payload.find("rows");
      if (rows != nullptr && rows->is_array()) {
        for (const auto& entry : rows->get_array()) {
          const auto* dd = entry.find("doc");
          if (dd == nullptr || !dd->is_object()) {
            continue;
          }
          const auto* meta = dd->find("meta");
          if (meta == nullptr || !meta->is_object()) {
            continue;
          }

          couchbase::core::management::views::design_document document{};
          document.rev = meta->at("rev").get_string();
          auto id = meta->at("id").get_string();
          if (static const std::string prefix = "_design/"; id.find(prefix) == 0) {
            document.name = id.substr(prefix.size());
          } else {
            document.name = id; // fall back, should not happen
          }
          if (static const std::string namespace_prefix = "dev_";
              document.name.find(namespace_prefix) == 0) {
            document.name = document.name.substr(namespace_prefix.size());
            document.ns = couchbase::core::design_document_namespace::development;
          } else {
            document.ns = couchbase::core::design_document_namespace::production;
          }
          if (document.ns != ns) {
            continue;
          }

          const auto* json = dd->find("json");
          if (json == nullptr || !json->is_object()) {
            continue;
          }
          if (const auto* views = json->find("views"); views != nullptr && views->is_object()) {
            for (const auto& [name, view_entry] : views->get_object()) {
              couchbase::core::management::views::design_document::view view;
              view.name = name;
              if (view_entry.is_object()) {
                if (const auto* map = view_entry.find("map"); map != nullptr && map->is_string()) {
                  view.map = map->get_string();
                }
                if (const auto* reduce = view_entry.find("reduce");
                    reduce != nullptr && reduce->is_string()) {
                  view.reduce = reduce->get_string();
                }
              }
              document.views[view.name] = view;
            }
          }

          response.design_documents.emplace_back(document);
        }
      }
    } else if (encoded.status_code == 404) {
      response.ctx.ec = errc::common::bucket_not_found;
    } else {
      response.ctx.ec = extract_common_error_code(encoded.status_code, encoded.body.data());
    }
  }
  return response;
}
} // namespace couchbase::core::operations::management