From 7330d64c5ab0693a6e6275421c72d6ccc90b4422 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Sat, 18 Apr 2026 13:37:53 -0500
Subject: [PATCH] feat(contacts): surface tropo duct count and suggest-edit
 hint
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Propagation analysis panel now adds a "Tropo duct detected at N/M HRRR
samples along the path" line whenever any HRRR sample flags ducting,
even if the overall mechanism classification doesn't end up pointing at
the duct (e.g. short paths, clear-LoS contacts). Also rewords the map
caveat to invite users with better coordinates to file a suggested
edit — clickable when logged in, otherwise a login link.
---
 .../live/contact_live/show.ex                 | 36 +++++++++++++++++--
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/lib/microwaveprop_web/live/contact_live/show.ex b/lib/microwaveprop_web/live/contact_live/show.ex
index 7c5aabf6..21c7b909 100644
--- a/lib/microwaveprop_web/live/contact_live/show.ex
+++ b/lib/microwaveprop_web/live/contact_live/show.ex
@@ -895,7 +895,25 @@ defmodule MicrowavepropWeb.ContactLive.Show do
 
       <%= if @contact.pos1 && @contact.pos2 do %>
         <p class="text-xs text-base-content/50 italic mb-1">
-          Locations approximate, in the center of the grid squares
+          Locations approximate, in the center of the grid squares.
+          <%= if current_user(assigns) do %>
+            Have more detailed position information?
+            <button
+              type="button"
+              phx-click="toggle_edit"
+              class="link link-hover not-italic text-base-content/70"
+            >
+              Suggest an edit
+            </button>
+          <% else %>
+            Have more detailed position information?
+            <.link
+              navigate={~p"/users/log-in"}
+              class="link link-hover not-italic text-base-content/70"
+            >
+              Log in to suggest an edit
+            </.link>
+          <% end %>
         </p>
         <div
           id="contact-map"
@@ -1917,7 +1935,7 @@ defmodule MicrowavepropWeb.ContactLive.Show do
 
     {factors, factor_rows, composite} = compute_factors(hrrr_path, contact, band_config)
     summary = build_summary(terrain, elevation_profile, hrrr, soundings, dist_km, band_mhz)
-    details = build_details(hrrr, soundings, elevation_profile, band_mhz)
+    details = build_details(hrrr, hrrr_path, soundings, elevation_profile, band_mhz)
 
     %{
       summary: summary,
@@ -2114,11 +2132,12 @@ defmodule MicrowavepropWeb.ContactLive.Show do
 
   defp band_summary(_, _), do: nil
 
-  defp build_details(hrrr, soundings, elevation_profile, _band_mhz) do
+  defp build_details(hrrr, hrrr_path, soundings, elevation_profile, _band_mhz) do
     Enum.reject(
       [
         refractivity_detail(hrrr),
         boundary_layer_detail(hrrr),
+        path_duct_count_detail(hrrr_path),
         sounding_ducting_detail(soundings),
         duct_layer_detail(elevation_profile)
       ],
@@ -2126,6 +2145,17 @@ defmodule MicrowavepropWeb.ContactLive.Show do
     )
   end
 
+  defp path_duct_count_detail(hrrr_path) when is_list(hrrr_path) and hrrr_path != [] do
+    total = length(hrrr_path)
+    ducting = Enum.count(hrrr_path, &(&1 && &1.ducting_detected))
+
+    if ducting > 0 do
+      "Tropo duct detected at #{ducting}/#{total} HRRR samples along the path."
+    end
+  end
+
+  defp path_duct_count_detail(_), do: nil
+
   defp refractivity_detail(%{min_refractivity_gradient: grad}) when is_number(grad) do
     g = round(grad)
     label = refractivity_label(g)