defmodule Drinkup.Event do
  require Logger
  alias Drinkup.{Event, Options}

  @type t() ::
          Event.Commit.t()
          | Event.Sync.t()
          | Event.Identity.t()
          | Event.Account.t()
          | Event.Info.t()

  @spec from(String.t(), map()) :: t() | nil
  def from("#commit", payload), do: Event.Commit.from(payload)
  def from("#sync", payload), do: Event.Sync.from(payload)
  def from("#identity", payload), do: Event.Identity.from(payload)
  def from("#account", payload), do: Event.Account.from(payload)
  def from("#info", payload), do: Event.Info.from(payload)
  def from(_type, _payload), do: nil

  @spec valid_seq?(integer() | nil, any()) :: boolean()
  def valid_seq?(nil, seq) when is_integer(seq), do: true
  def valid_seq?(last_seq, nil) when is_integer(last_seq), do: true
  def valid_seq?(last_seq, seq) when is_integer(last_seq) and is_integer(seq), do: seq > last_seq
  def valid_seq?(_last_seq, _seq), do: false

  @spec dispatch(t(), Options.t()) :: :ok
  def dispatch(message, %Options{consumer: consumer, name: name}) do
    supervisor_name = {:via, Registry, {Drinkup.Registry, {name, Tasks}}}

    {:ok, _pid} =
      Task.Supervisor.start_child(supervisor_name, fn ->
        try do
          consumer.handle_event(message)
        rescue
          e ->
            Logger.error("Error in event handler: #{Exception.format(:error, e, __STACKTRACE__)}")
        end
      end)

    :ok
  end
end