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module;

#include <boost/beast/http/message.hpp>
#include <boost/json.hpp>
#include <boost/locale/message.hpp>

export module routemon:problem;

import std;
import :locale;

namespace http = boost::beast::http;
namespace json = boost::json;

namespace routemon::problem {

export struct details
{
  http::status status;
  blocale::message title;
  std::string_view type_uri;
  std::optional<blocale::message> detail = std::nullopt;
  std::optional<std::string> instance = std::nullopt;

  auto set_detail(blocale::message detail) -> details&
  {
    this->detail = detail;
    return *this;
  }

  auto set_instance(std::string&& instance) -> details&
  {
    this->instance = instance;
    return *this;
  }
  auto set_instance(std::string_view instance) -> details&
  {
    this->instance = std::string{instance};
    return *this;
  }
};

export auto tag_invoke(
    json::value_from_tag, json::value& jv, details const& details,
    std::locale locale) -> void
{
  auto obj = json::object{
    {"type", details.type_uri},
    {"title", details.title.str(locale)},
    {"status", static_cast<unsigned>(details.status)},
  };
  if (details.detail)
    obj["detail"] = details.detail->str(locale);
  if (details.instance)
    obj["instance"] = *details.instance;
  jv = obj;
}

export struct tpl
{
  http::status status;
  blocale::message title;
  std::string_view type_uri;

  auto instantiate() const -> details
  {
    return details{status, title, type_uri};
  }
};

} // namespace routemon::problem