defmodule NullaWeb.ActivityPub.NoteController do
  use NullaWeb, :controller
  alias Nulla.Repo
  alias Nulla.Notes
  alias Nulla.Likes
  alias Nulla.Announces
  alias NullaWeb.ActivityPub.NoteJSON

  def show(conn, %{"username" => username, "id" => id}) do
    case Integer.parse(id) do
      {int_id, ""} ->
        note = Notes.get_note!(int_id) |> Repo.preload([:actor, :media_attachments])

        cond do
          is_nil(note) ->
            conn
            |> put_status(:not_found)
            |> json(%{error: "Not Found"})
            |> halt()

          username != note.actor.preferredUsername ->
            conn
            |> put_status(:not_found)
            |> json(%{error: "Not Found"})
            |> halt()

          true ->
            likes_count = length(Likes.list_likes_by(note_id: note.id))
            shares_count = length(Announces.list_announces_by(note_id: note.id))

            conn
            |> put_resp_content_type("application/activity+json")
            |> json(NoteJSON.show(note, likes_count, shares_count))
        end

      _ ->
        conn
        |> put_status(:not_found)
        |> json(%{error: "Not Found"})
        |> halt()
    end
  end
end