#pragma once

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

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

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

public:
  AuthRegistrationExecutor(mysqlx::Session& session,
                           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;

    auto body = req.body();
    value req_json;
    value response_body;

    response_body.emplace_object();

    try
    {
      req_json = json::parse(body);
    }
    catch (const system::system_error& err)
    {
      http::response<ResponseType> res{http::status::bad_request, req.version()};
      response_body.as_object().emplace("Result", "cannot deserialize json");

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

      return res;
    }

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

    if (!ValidateLogin(login) || !ValidatePassword(password))
    {
      http::response<ResponseType> res{http::status::unprocessable_entity, req.version()};

      response_body.as_object().emplace(
        "Result",
        "Validations failed. Login should have length from 3 to 50. Password from 5 characters length."
        );

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

      return res;
    }

    if (user_dao_->GetByLogin(login).has_value())
    {
      http::response<ResponseType> res{http::status::conflict, req.version()};

      response_body.as_object().emplace(
        "Result",
        "user with login "s + login + " exists"s
        );

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

      return res;
    }

    User user;

    user.SetLogin(login);
    user.SetPassword(password);

    const auto uuid_stringified = user_dao_->Create(user);

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

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

    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;
  }
};
}