defmodule Microwaveprop.Rover.CandidateDetailTest do
  use ExUnit.Case, async: true

  alias Microwaveprop.Rover.CandidateDetail

  describe "summarize/5" do
    test "returns the candidate's grid label and an empty links list when no stations are passed" do
      candidate = %{lat: 32.9, lon: -97.0}
      result = CandidateDetail.summarize(candidate, [], 10_000, ~U[2026-04-29 12:00:00Z], :ssb)

      assert String.length(result.grid) == 10
      # 10-character grid for that point.
      assert result.links == []
    end

    test "computes per-link summary fields when stations are supplied" do
      # SRTM tiles are not present in test, so elev profile returns [].
      # `summarize/5` handles that gracefully and still returns a link.
      candidate = %{lat: 32.9, lon: -97.0}

      stations = [
        %{callsign: "W5LUA", lat: 33.05, lon: -96.6},
        %{callsign: "W5HN", lat: 32.7, lon: -97.4}
      ]

      result =
        CandidateDetail.summarize(candidate, stations, 10_000, ~U[2026-04-29 12:00:00Z], :ssb)

      assert length(result.links) == 2

      Enum.each(result.links, fn link ->
        assert byte_size(link.callsign) > 0
        assert is_float(link.distance_km)
        assert byte_size(link.bearing) > 0
        assert is_float(link.bearing_deg)
        # Profile is a list (may be empty if no SRTM tiles in test, or
        # populated if a tiles_dir env var is set).
        assert Enum.all?(link.profile, &is_map/1)
      end)
    end
  end
end