defmodule Mobilizon.Tombstone do
  @moduledoc """
  Represent tombstones for deleted objects. Saves only URI
  """

  use Ecto.Schema
  import Ecto.Changeset
  alias Mobilizon.Actors.Actor
  alias Mobilizon.Storage.Repo

  @type t :: %__MODULE__{
          uri: String.t(),
          actor: Actor.t()
        }

  @required_attrs [:uri, :actor_id]
  @optional_attrs []
  @attrs @required_attrs ++ @optional_attrs

  schema "tombstones" do
    field(:uri, :string)
    belongs_to(:actor, Actor)

    timestamps()
  end

  @doc false
  def changeset(%__MODULE__{} = tombstone, attrs) do
    tombstone
    |> cast(attrs, @attrs)
    |> validate_required(@attrs)
  end

  @spec create_tombstone(map()) :: {:ok, Ecto.Schema.t()} | {:error, Ecto.Changeset.t()}
  def create_tombstone(attrs) do
    %__MODULE__{}
    |> changeset(attrs)
    |> Repo.insert(on_conflict: :replace_all, conflict_target: :uri)
  end

  @spec find_tombstone(String.t()) :: Ecto.Schema.t() | nil
  def find_tombstone(uri) do
    Repo.get_by(__MODULE__, uri: uri)
  end
end