module;

#include <boost/geometry.hpp>
#include <boost/json.hpp>

export module routemon:api;

import std;
import :datex2;
import :geo;
import :gpx;
import :log;
import :time;
import :trace;

namespace {

namespace chrono = std::chrono;
namespace json = boost::json;
namespace views = std::views;

} // namespace

export namespace routemon::api {

struct relevant_road_closure
{
  std::vector<geo::linestring> relevant_lss;
};

struct relevant_situation
{
  std::string id;
  std::optional<geo::point> location;
  std::vector<std::string> comments;
  std::vector<relevant_road_closure> relevant_road_closures;
};

struct track_segment
{
  geo::linestring points;
};

struct track
{
  std::vector<track_segment> segments;
};

struct process_gpx_result
{
  std::vector<track> tracks;
  std::vector<relevant_situation> relevant_situations;
};

struct sysinfo
{
  time::timestamp using_publication_of;
  std::size_t blse_index_size;
  std::size_t p_index_size;
};

auto tag_invoke(
    json::value_from_tag, json::value& jv, relevant_road_closure const& clo)
    -> void;
auto tag_invoke(
    json::value_from_tag, json::value& jv, relevant_situation const& sit)
    -> void;
auto tag_invoke(json::value_from_tag, json::value& jv, track_segment const& seg)
    -> void;
auto tag_invoke(json::value_from_tag, json::value& jv, track const& track)
    -> void;
auto tag_invoke(
    json::value_from_tag, json::value& jv, process_gpx_result const& res)
    -> void;
auto tag_invoke(json::value_from_tag, json::value& jv, sysinfo const& info)
    -> void;

class handler
{
  constexpr static auto const min_distance_ = 5.0;

  using blse_index_value = std::tuple<
      geo::box, geo::multi_polygon, std::shared_ptr<datex2::road_closure>
  >;
  using p_index_value =
      std::pair<geo::point, std::shared_ptr<datex2::road_closure>>;
  using blse_index =
      bgeo::index::rtree<blse_index_value, bgeo::index::quadratic<16>>;
  using p_index = bgeo::index::rtree<p_index_value, bgeo::index::quadratic<16>>;

  log::logger l_;
  datex2::situation_publication pub_;
  blse_index blse_index_;
  p_index p_index_;

public:
  explicit handler(log::logger const& l, datex2::situation_publication pub);

  auto process_gpx(gpx::file&& gpx_file) -> std::optional<process_gpx_result>;
  auto sysinfo() -> sysinfo;
};

} // namespace routemon::api