defmodule TuskerPush do
  @moduledoc """
  TuskerPush keeps the contexts that define your domain
  and business logic.

  Contexts are also responsible for managing your data, regardless
  if it comes from the database, an external API or others.
  """

  alias TuskerPush.Registration
  alias TuskerPush.Repo

  @spec register(Map.t()) ::
          {:ok, Registration.t()} | {:error, Ecto.Changeset.t()}
  def register(params) do
    params
    |> Registration.create_changeset()
    |> Repo.insert()
  end

  @spec unregister(String.t()) :: :ok | {:error, :no_registration | Ecto.Changeset.t()}
  def unregister(id) when is_binary(id) do
    with registration when not is_nil(registration) <- Repo.get(Registration, id),
         {:ok, _} <- Repo.delete(registration) do
      :ok
    else
      nil ->
        {:error, :no_registration}

      {:error, reason} ->
        {:error, reason}
    end
  end

  @spec unregister(Registration.t()) :: :ok | {:error, Ecto.Changeset.t()}
  def unregister(%Registration{} = registration) do
    case Repo.delete(registration) do
      {:ok, _} -> :ok
      {:error, reason} -> {:error, reason}
    end
  end

  @spec get_registration(String.t()) :: Registration.t() | nil
  def get_registration(id) do
    Repo.get(Registration, id)
  end

  @spec check_registration_expired(Registration.t()) :: :ok | {:expired, Registration.t()}
  def check_registration_expired(_registration) do
    # TODO: expiration & grace period
    :ok
  end
end