defmodule Snowhite.Scheduler.Schedule do
  alias __MODULE__
  defstruct name: nil, time: nil, message: nil, last_execution: nil

  @type t :: %Schedule{
          name: schedule_id(),
          time: time_def(),
          message: message_def(),
          last_execution: NaiveDateTime.t() | nil
        }
  @type schedule_id :: String.t() | atom()
  @type time_def :: {:at, Time.t()}
  @type message_def :: {pid(), any()}
  @spec new(schedule_id(), time_def(), message_def()) :: t()
  def new(name, time, message) do
    %Schedule{name: name, time: time, message: message}
  end

  @spec should_run?(t(), Time.t()) :: boolean()
  def should_run?(%Schedule{time: {:at, time}}, current_time),
    do: Time.diff(time, current_time) == 0

  def put_last_execution(%Schedule{} = schedule, date) do
    %Schedule{schedule | last_execution: date}
  end
end