/* -*- 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.
 */

#pragma once

#include "core/error_context/search.hxx"
#include "core/io/http_context.hxx"
#include "core/io/http_message.hxx"
#include "core/io/http_traits.hxx"
#include "core/json_string.hxx"
#include "core/platform/uuid.h"
#include "core/public_fwd.hxx"
#include "core/search_highlight_style.hxx"
#include "core/search_scan_consistency.hxx"
#include "core/timeout_defaults.hxx"
#include "core/vector_query_combination.hxx"

#include <couchbase/mutation_token.hxx>

#include <map>
#include <variant>
#include <vector>

namespace couchbase::core::operations
{
struct search_response {
  struct search_metrics {
    std::chrono::nanoseconds took{};
    std::uint64_t total_rows{};
    double max_score{};
    std::uint64_t success_partition_count{};
    std::uint64_t error_partition_count{};
  };

  struct search_meta_data {
    std::string client_context_id;
    search_metrics metrics{};
    std::map<std::string, std::string> errors;
  };

  struct search_location {
    std::string field;
    std::string term;
    std::uint64_t position;
    std::uint64_t start_offset;
    std::uint64_t end_offset;
    std::optional<std::vector<std::uint64_t>> array_positions{};
  };

  struct search_row {
    std::string index;
    std::string id;
    double score;
    std::vector<search_location> locations{};
    std::map<std::string, std::vector<std::string>> fragments{};
    std::string fields{};
    std::string explanation{};
  };

  struct search_facet {
    struct term_facet {
      std::string term{};
      std::uint64_t count{};
    };

    struct date_range_facet {
      std::string name{};
      std::uint64_t count{};
      std::optional<std::string> start{};
      std::optional<std::string> end{};
    };

    struct numeric_range_facet {
      std::string name{};
      std::uint64_t count{};
      std::variant<std::monostate, std::uint64_t, double> min{};
      std::variant<std::monostate, std::uint64_t, double> max{};
    };

    std::string name;
    std::string field;
    std::uint64_t total;
    std::uint64_t missing;
    std::uint64_t other;
    std::vector<term_facet> terms{};
    std::vector<date_range_facet> date_ranges{};
    std::vector<numeric_range_facet> numeric_ranges{};
  };

  error_context::search ctx;
  std::string status{};
  search_meta_data meta{};
  std::string error{};
  std::vector<search_row> rows{};
  std::vector<search_facet> facets{};
};

struct search_request {
  using response_type = search_response;
  using encoded_request_type = io::http_request;
  using encoded_response_type = io::http_response;
  using error_context_type = error_context::search;

  static const inline service_type type = service_type::search;
  static const inline std::string observability_identifier = "search";

  std::string index_name;
  couchbase::core::json_string query;
  std::optional<std::string> bucket_name;
  std::optional<std::string> scope_name;

  /**
   * UNCOMMITTED: This should be set to false if using the .search() API, leave unset for old
   * .search_query() API
   */
  std::optional<bool> show_request;

  std::optional<couchbase::core::json_string> vector_search;
  std::optional<couchbase::core::vector_query_combination> vector_query_combination;

  std::optional<std::uint32_t> limit{};
  std::optional<std::uint32_t> skip{};
  std::optional<bool> explain{ false };
  bool disable_scoring{ false };
  /**
   * UNCOMMITTED: If set to true, will include the vector of search_location in rows.
   */
  bool include_locations{ false };

  std::optional<couchbase::core::search_highlight_style> highlight_style{};
  std::vector<std::string> highlight_fields{};
  std::vector<std::string> fields{};
  std::vector<std::string> collections{};

  std::optional<couchbase::core::search_scan_consistency> scan_consistency{};
  std::vector<mutation_token> mutation_state{};

  std::vector<std::string> sort_specs{};

  std::map<std::string, std::string> facets{};

  std::map<std::string, couchbase::core::json_string> raw{};
  std::optional<std::function<utils::json::stream_control(std::string)>> row_callback{};
  std::optional<std::string> client_context_id{};
  std::optional<std::chrono::milliseconds> timeout{};
  /**
   * UNCOMMITTED: If set to true, will log the request to and/or the response from the search
   * service.
   */
  std::optional<bool> log_request{ false };
  std::optional<bool> log_response{ false };

  [[nodiscard]] auto encode_to(encoded_request_type& encoded,
                               http_context& context) -> std::error_code;

  [[nodiscard]] auto make_response(error_context::search&& ctx,
                                   const encoded_response_type& encoded) const -> search_response;

  std::string body_str{};

  std::shared_ptr<couchbase::tracing::request_span> parent_span{ nullptr };
};

} // namespace couchbase::core::operations
namespace couchbase::core::io::http_traits
{
template<>
struct supports_parent_span<couchbase::core::operations::search_request> : public std::true_type {
};
} // namespace couchbase::core::io::http_traits