defmodule MobilizonWeb.Resolvers.Event do
  alias Mobilizon.Service.ActivityPub
  alias Mobilizon.Activity
  alias Mobilizon.Actors
  alias Mobilizon.Events.Event

  # We limit the max number of events that can be retrieved
  @event_max_limit 100

  def list_events(_parent, %{page: page, limit: limit}, _resolution)
      when limit < @event_max_limit do
    {:ok, Mobilizon.Events.list_events(page, limit)}
  end

  def list_events(_parent, %{page: _page, limit: _limit}, _resolution) do
    {:error, :events_max_limit_reached}
  end

  def find_event(_parent, %{uuid: uuid}, _resolution) do
    case Mobilizon.Events.get_event_full_by_uuid(uuid) do
      nil ->
        {:error, "Event with UUID #{uuid} not found"}

      event ->
        {:ok, event}
    end
  end

  @doc """
  List participant for event (separate request)
  """
  def list_participants_for_event(_parent, %{uuid: uuid}, _resolution) do
    {:ok, Mobilizon.Events.list_participants_for_event(uuid)}
  end

  @doc """
  List participants for event (through an event request)
  """
  def list_participants_for_event(%{uuid: uuid}, %{page: page, limit: limit}, _resolution) do
    {:ok, Mobilizon.Events.list_participants_for_event(uuid, page, limit)}
  end

  @doc """
  Search events by title
  """
  def search_events(_parent, %{search: search, page: page, limit: limit}, _resolution) do
    {:ok, Mobilizon.Events.find_events_by_name(search, page, limit)}
  end

  @doc """
  Search events and actors by title
  """
  def search_events_and_actors(_parent, %{search: search, page: page, limit: limit}, _resolution) do
    search = String.trim(search)

    found =
      case String.contains?(search, "@") do
        true ->
          with {:ok, actor} <- ActivityPub.find_or_make_actor_from_nickname(search) do
            actor
          else
            {:error, _err} ->
              nil
          end

        _ ->
          Mobilizon.Events.find_events_by_name(search, page, limit) ++
            Mobilizon.Actors.find_actors_by_username_or_name(search, page, limit)
      end

    require Logger
    Logger.debug(inspect(found))
    {:ok, found}
  end

  @doc """
  Create an event
  """
  def create_event(_parent, args, %{context: %{current_user: user}}) do
    with {:ok, %Activity{data: %{"object" => %{"type" => "Event"} = object}}} <-
           args
           # Set default organizer_actor_id if none set
           |> Map.update(
             :organizer_actor_username,
             Actors.get_actor_for_user(user).preferred_username,
             & &1
           )
           |> MobilizonWeb.API.Events.create_event() do
      {:ok,
       %Event{
         title: object["name"],
         description: object["content"],
         uuid: object["uuid"],
         url: object["id"]
       }}
    end
  end

  def create_event(_parent, _args, _resolution) do
    {:error, "You need to be logged-in to create events"}
  end
end