defmodule DiffuserWeb.Plugs.UserAuth do
  use DiffuserWeb, :controller
  import Plug.Conn
  alias Diffuser.Accounts
  alias Diffuser.Repo

  def init(default), do: default

  def call(%{remote_ip: remote_ip} = conn, _) do
    remote_ip = remote_ip |> :inet_parse.ntoa() |> to_string()

    case get_session(conn, :user) do
      nil ->
        with {:ok, user} <- Accounts.create_user(%{ip_address: remote_ip}) do
          put_session(conn, :user, user |> Repo.preload(votes: [:prompt_request]))
        else
          {:error, _changeset} -> put_session(conn, :user, nil)
        end

      %Accounts.User{ip_address: user_ip} = user ->
        with false <- user_ip == remote_ip,
             {:ok, user} <- Accounts.update_user(user, %{ip_address: remote_ip}) do
          conn |> put_session(:user, user |> Repo.preload(votes: [:prompt_request]))
        else
          true ->
            put_session(
              conn,
              :user,
              Accounts.get_user!(user.id) |> Repo.preload(votes: [:prompt_request])
            )

          _ ->
            put_session(conn, :user, nil)
        end
    end
  end
end