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Cocktail is a date/time recurrence library for Elixir based on iCalendar events. It can generate a stream of dates/times based on a set of repeat rules.

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cocktail lib cocktail validation second_of_minute.ex
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lib/cocktail/validation/second_of_minute.ex 

defmodule Cocktail.Validation.SecondOfMinute do

  @moduledoc false



  import Integer, only: [mod: 2]

  import Cocktail.Validation.Shift

  import Cocktail.Util, only: [next_gte: 2]



  @type t :: %__MODULE__{seconds: [Cocktail.second_number()]}



  @enforce_keys [:seconds]

  defstruct seconds: nil



  @spec new([Cocktail.second_number()]) :: t

  def new(seconds), do: %__MODULE__{seconds: seconds |> Enum.sort()}



  @spec next_time(t, Cocktail.time(), Cocktail.time()) :: Cocktail.Validation.Shift.result()

  def next_time(%__MODULE__{seconds: seconds}, time, _) do

    current_second = time.second

    second = next_gte(seconds, current_second) || hd(seconds)

    diff = (second - current_second) |> mod(60)



    shift_by(diff, :seconds, time)

  end

end