radiorabe / raar / 11900633159

module TimeFilterable

  TIME_PARTS = [:year, :month, :day, :hour, :min, :sec].freeze

  private

  def start_finish

    parts = param_time_parts

    start = get_timestamp(parts)

    finish = start + range(parts)

    [start, finish]

  end

  def param_time_parts

    parts = params.values_at(*TIME_PARTS).compact

    time = params[:time].to_s.match(/^(\d{2})(\d{2})?(\d{2})?$/)

    parts += time[1..3].compact if time && parts.size == 3

    parts

  end

  def range(parts)

    range = TIME_PARTS[parts.size - 1]

    case range

    when :min then 1.minute

    when :sec then 1.second

    else 1.send(range)

    end

  end

  def get_timestamp(parts)

    Time.zone.local(*parts)

  rescue ArgumentError

    not_found

  end

end