Show last listen at for each collected record

lib/music_library/records.ex

@@ -211,6 +211,23 @@ defmodule MusicLibrary.Records do
     end
   end
 
+  def get_last_listened_track(record_id) do
+    q =
+      from r in fragment("records, json_each(records.release_ids)"),
+        where: fragment("records.id = ?", ^record_id),
+        select: r.value
+
+    release_ids = Repo.all(q)
+
+    q =
+      from t in LastFm.Track,
+        where: fragment("? ->> '$.musicbrainz_id'", t.album) in ^release_ids,
+        order_by: [desc: t.scrobbled_at_uts],
+        limit: 1
+
+    Repo.one(q)
+  end
+
   def refresh_cover(record) do
     with {:ok, cover_data} <- MusicBrainz.get_cover_art({:url, record.cover_url}) do
       {:ok, thumb_data} = Cover.resize(cover_data)

lib/music_library/scrobble_activity.ex

@@ -177,7 +177,7 @@ defmodule MusicLibrary.ScrobbleActivity do
     track.artist.musicbrainz_id
   end
 
-  defp localize_scrobbled_at(uts, timezone) do
+  def localize_scrobbled_at(uts, timezone) do
     ldt =
       uts
       |> DateTime.from_unix!()

lib/music_library_web/live/collection_live/show.ex

@@ -1,6 +1,8 @@
 defmodule MusicLibraryWeb.CollectionLive.Show do
   use MusicLibraryWeb, :live_view
 
+  import MusicLibrary.ScrobbleActivity, only: [localize_scrobbled_at: 2]
+
   import MusicLibraryWeb.RecordComponents,
     only: [
       format_label: 1,
@@ -19,6 +21,7 @@ defmodule MusicLibraryWeb.CollectionLive.Show do
 
     {:ok,
      socket
+     |> assign(:timezone, resolve_timezone!())
      |> assign(:can_scrobble?, ScrobbleActivity.can_scrobble?())
      |> assign(:release_with_tracks, nil)}
   end
@@ -26,6 +29,7 @@ defmodule MusicLibraryWeb.CollectionLive.Show do
   @impl true
   def handle_params(%{"id" => id}, _, socket) do
     record = Records.get_record!(id)
+    last_listened_track = Records.get_last_listened_track(id)
 
     socket =
       if record.selected_release_id do
@@ -38,7 +42,8 @@ defmodule MusicLibraryWeb.CollectionLive.Show do
      socket
      |> assign(:current_section, :collection)
      |> assign(:page_title, page_title(socket.assigns.live_action, record))
-     |> assign(:record, record)}
+     |> assign(:record, record)
+     |> assign(:last_listened_track, last_listened_track)}
   end
 
   @impl true
@@ -154,4 +159,9 @@ defmodule MusicLibraryWeb.CollectionLive.Show do
 
   defp title_segment(:show), do: gettext("Show")
   defp title_segment(:edit), do: gettext("Edit")
+
+  defp resolve_timezone! do
+    Application.get_env(:music_library, MusicLibraryWeb)
+    |> Keyword.fetch!(:timezone)
+  end
 end

lib/music_library_web/live/collection_live/show.html.heex

@@ -251,6 +251,15 @@
             {Records.Record.format_as_date(@record.updated_at)}
           </dd>
         </div>
+        <div class="py-2 sm:grid sm:grid-cols-3 sm:gap-4 sm:px-0">
+          <dt class="text-xs md:text-sm font-medium leading-6 text-zinc-900 dark:text-zinc-400">
+            {gettext("Last listened at")}
+          </dt>
+          <dd class="mt-1 text-xs md:text-sm leading-6 text-zinc-700 dark:text-zinc-300 sm:col-span-2 sm:mt-0">
+            {@last_listened_track &&
+              localize_scrobbled_at(@last_listened_track.scrobbled_at_uts, @timezone)}
+          </dd>
+        </div>
       </dl>
     </div>
   </div>

priv/gettext/default.pot

@@ -879,3 +879,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Insertion"
 msgstr ""
+
+#: lib/music_library_web/live/collection_live/show.html.heex
+#, elixir-autogen, elixir-format
+msgid "Last listened at"
+msgstr ""

priv/gettext/en/LC_MESSAGES/default.po

@@ -879,3 +879,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Insertion"
 msgstr ""
+
+#: lib/music_library_web/live/collection_live/show.html.heex
+#, elixir-autogen, elixir-format
+msgid "Last listened at"
+msgstr ""