defmodule Microwaveprop.Buildings.MsFootprintsTest do
  use ExUnit.Case, async: true

  alias Microwaveprop.Buildings.MsFootprints

  describe "quadkey/3" do
    test "encodes a known DFW point at zoom 9" do
      # (32.8, -97.0) — urban DFW — lies inside MS quadkey 023112330 at
      # zoom 9, cross-checked against the published dataset index where
      # 023112330 is the 109 MB tile covering the metro core.
      assert MsFootprints.quadkey(32.8, -97.0, 9) == "023112330"

      # A polygon sampled directly from the 023112322 csv.gz file
      # (lat 32.221708, lon -97.736116) confirms that tile's footprint.
      assert MsFootprints.quadkey(32.221708, -97.736116, 9) == "023112322"
    end

    test "Greenwich at zoom 1 hits root quadrants" do
      assert MsFootprints.quadkey(0.5, 0.5, 1) == "1"
      assert MsFootprints.quadkey(-0.5, -0.5, 1) == "2"
    end
  end

  describe "quadkeys_for_bbox/2" do
    test "returns the cell containing a point and immediate neighbors at zoom 9" do
      # Bbox covering ~80 km around DFW should span 4-9 zoom-9 quadkeys.
      bbox = %{"south" => 32.0, "north" => 33.5, "west" => -97.8, "east" => -96.4}
      keys = MsFootprints.quadkeys_for_bbox(bbox, 9)

      assert is_list(keys)
      assert length(keys) > 1
      assert "023112330" in keys
    end
  end
end