gpex

defmodule Gpex.TrackSegment do
  defstruct ~w(points)a

  alias Gpex.Point

  def new(_attrs, children) when is_list(children) do
    points =
      children
      |> Enum.map(fn
        {"trkpt", attrs, children} ->
          Point.new(attrs, children)
        _ ->
          nil
      end)
      |> Enum.filter(& &1)

    %__MODULE__{points: points}
  end

  defimpl Gpex.XML.Encoder do
    def encode(segment, _opts \\ []) do
      """
      <trkseg>
        #{ Gpex.XML.Encoder.encode(segment.points) }
      </trkseg>
      """
    end
  end
end