#pragma once
#include <boost/log/trivial.hpp>

#include <regex>
#include <boost/json.hpp>
#include <mysqlx/xdevapi.h>

#include "IExecutor.h"
#include "../DAO/IUserDAO.h"
#include "../exceptions/session_exception.h"

namespace uad
{
template <class Body, class Allocator, class ResponseType>
class AuthRegistrationExecutor : public IExecutor<Body, Allocator, ResponseType>
{
  mysqlx::Session& session_;
  const std::shared_ptr<IUserDAO>& user_dao_;

public:
  AuthRegistrationExecutor(mysqlx::Session& session,
                           const std::shared_ptr<IUserDAO>& user_dao)
    : session_(session), user_dao_(user_dao)
  {
  }

  boost::beast::http::response<ResponseType> operator ()(
    boost::beast::http::request<Body, boost::beast::http::basic_fields<Allocator>>&& req
  ) override
  {
    using namespace boost;
    using namespace boost::json;
    using namespace boost::beast;
    using namespace std::string_literals;

    BOOST_LOG_TRIVIAL(info) << "POST /api/v1/Auth/Registration - Request";

    const auto& body = req.body();
    value req_json;

    try
    {
      req_json = json::parse(body);
    }
    catch (const system::system_error& err)
    {
      BOOST_LOG_TRIVIAL(error) << "POST /api/v1/Auth/Registration - Response 400: Cannot deserialize json";
      throw session_exception(http::status::bad_request, "Cannot deserialize json");
    }

    const std::string login = req_json.as_object().at("login").as_string().c_str();
    const std::string password = req_json.as_object().at("password").as_string().c_str();

    if (!ValidateLogin(login) || !ValidatePassword(password))
    {
      BOOST_LOG_TRIVIAL(error) << "POST /api/v1/Auth/Registration - Response 422: Validations failed. Login should have length from 3 to 50. Password from 5 characters length.";
      throw session_exception(
      http::status::unprocessable_entity,
        "Validations failed. Login should have length from 3 to 50. Password from 5 characters length."s
        );
    }

    if (user_dao_->GetByLogin(login).has_value())
    {
      BOOST_LOG_TRIVIAL(error) << "POST /api/v1/Auth/Registration - Response 409: "s + "User with login "s + login + " exists"s;
      throw session_exception(http::status::conflict, "User with login "s + login + " exists"s);
    }

    user_dto user;

    user.login = login;
    user.hashed_password = HashPassword(password);

    const std::string uuid_stringified = user_dao_->Create(user);

    http::response<ResponseType> res{
        http::status::created, req.version()
      };
    value response_body;

    response_body.emplace_object();

    response_body.as_object().emplace(
        "uuid",
        uuid_stringified
        );
    response_body.as_object().emplace(
        "login",
        user.login
        );

    res.body() = serialize(response_body);
    res.set(http::field::content_type, "application/json");
    res.content_length(res.body().size());

    return res;
  }

private:
  bool ValidateLogin(const std::string& login)
  {
    if (login.size() < 3 || login.size() > 50) return false;

    std::regex pattern(std::string("^[A-Za-z0-9_]+$"));

    return std::regex_match(login, pattern);
  }

  bool ValidatePassword(const std::string& password)
  {
    return password.size() >= 5;
  }
};
}