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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 minute_of_hour.ex
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lib/cocktail/validation/minute_of_hour.ex 

defmodule Cocktail.Validation.MinuteOfHour do

  @moduledoc false



  import Integer, only: [mod: 2]

  import Cocktail.Validation.Shift

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



  @type t :: %__MODULE__{minutes: [Cocktail.minute_number()]}



  @enforce_keys [:minutes]

  defstruct minutes: []



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

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



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

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

    current_minute = time.minute

    minute = next_gte(minutes, current_minute) || hd(minutes)

    diff = (minute - current_minute) |> mod(60)



    shift_by(diff, :minutes, time, :beginning_of_minute)

  end

end