defmodule Microwaveprop.Rover.ElevationTest do
  use ExUnit.Case, async: false

  alias Microwaveprop.Rover.Elevation

  setup do
    tmp = Path.join(System.tmp_dir!(), "rover_elev_#{System.unique_integer([:positive])}")
    File.mkdir_p!(tmp)
    prev = Application.get_env(:microwaveprop, :srtm_tiles_dir)
    Application.put_env(:microwaveprop, :srtm_tiles_dir, tmp)

    on_exit(fn ->
      File.rm_rf!(tmp)

      if prev do
        Application.put_env(:microwaveprop, :srtm_tiles_dir, prev)
      else
        Application.delete_env(:microwaveprop, :srtm_tiles_dir)
      end
    end)

    :ok
  end

  describe "lookup_many/1" do
    test "returns map keyed by {lat, lon}, nil values when no tiles available" do
      points = [{33.0, -96.0}, {30.0, -97.0}]
      result = Elevation.lookup_many(points)

      assert is_map(result)
      assert Map.has_key?(result, {33.0, -96.0})
      assert Map.has_key?(result, {30.0, -97.0})
      assert result[{33.0, -96.0}] == nil
      assert result[{30.0, -97.0}] == nil
    end

    test "empty list returns empty map" do
      assert Elevation.lookup_many([]) == %{}
    end
  end
end