defmodule Mongo.Events do
  @doc false
  def notify(event) do
    GenEvent.notify(__MODULE__, event)
  end

  defmodule ServerDescriptionChangedEvent do
    @moduledoc "Published when server description changes, but does NOT include changes to the RTT."
    defstruct [:address, :topology_pid, :previous_description, :new_description]
  end

  defmodule ServerOpeningEvent do
    @moduledoc "Published when server is initialized."
    defstruct [:address, :topology_pid]
  end

  defmodule ServerClosedEvent do
    @moduledoc "Published when server is closed."
    defstruct [:address, :topology_pid]
  end

  defmodule TopologyDescriptionChangedEvent do
    @moduledoc "Published when topology description changes."
    defstruct [:topology_pid, :previous_description, :new_description]
  end

  defmodule TopologyOpeningEvent do
    @moduledoc "Published when topology is initialized."
    defstruct [:topology_pid]
  end

  defmodule TopologyClosedEvent do
    @moduledoc "Published when topology is closed."
    defstruct [:topology_pid]
  end

  defmodule ServerHeartbeatStartedEvent do
    @moduledoc ~S"""
    Fired when the server monitor’s ismaster command is started - immediately before the ismaster
    command is serialized into raw BSON and written to the socket.
    """
    defstruct [:connection_pid]
  end

  defmodule ServerHeartbeatSucceededEvent do
    @moduledoc "Fired when the server monitor’s ismaster succeeds."
    defstruct [:duration, :reply, :connection_pid]
  end

  defmodule ServerHeartbeatFailedEvent do
    @moduledoc ~S"""
    Fired when the server monitor’s ismaster fails, either with an “ok: 0” or a socket exception.
    """
    defstruct [:duration, :failure, :connection_pid]
  end
end