Can print an individual medium tracklist

lib/music_library/records/tracklist_pdf.ex

@@ -16,19 +16,28 @@ defmodule MusicLibrary.Records.TracklistPdf do
   @spec generate(MusicLibrary.Records.Record.t(), Release.t()) ::
           {:ok, binary()} | {:error, term()}
   def generate(record, release) do
-    markup = build_markup(record, release)
+    markup = build_markup(record, release.media)
     Typst.render_to_pdf(markup)
   end
 
-  defp build_markup(record, release) do
-    media_count = Release.media_count(release)
-    track_count = Enum.sum(Enum.map(release.media, &length(&1.tracks)))
+  @spec generate_medium(MusicLibrary.Records.Record.t(), Release.t(), integer()) ::
+          {:ok, binary()} | {:error, term()}
+  def generate_medium(record, release, medium_number) do
+    case Release.get_medium(release, medium_number) do
+      nil -> {:error, :medium_not_found}
+      medium -> generate(record, %{release | media: [medium]})
+    end
+  end
+
+  defp build_markup(record, media) do
+    media_count = length(media)
+    track_count = Enum.sum(Enum.map(media, &length(&1.tracks)))
     header_count = if media_count > 1, do: media_count, else: 0
     total_items = track_count + header_count
 
     {columns, font_size, show_duration} = layout_params(total_items, media_count)
 
-    content = build_media(release, media_count, font_size, show_duration)
+    content = build_media(media, media_count, font_size, show_duration)
 
     """
     #set page(width: 120mm, height: 120mm, margin: 5mm, background: rect(width: 100%, height: 100%, stroke: 0.5pt + black))
@@ -56,8 +65,8 @@ defmodule MusicLibrary.Records.TracklistPdf do
     """
   end
 
-  defp build_media(release, media_count, font_size, show_duration) do
-    release.media
+  defp build_media(media, media_count, font_size, show_duration) do
+    media
     |> Enum.map_join("\n", fn medium ->
       build_medium(medium, media_count, font_size, show_duration)
     end)

lib/music_library_web/components/release.ex

@@ -136,6 +136,7 @@ defmodule MusicLibraryWeb.Components.Release do
               media_count={MusicBrainz.Release.media_count(release_with_tracks)}
               selected_tracks={@selected_tracks}
               myself={@myself}
+              record={@record}
             />
           </.async_result>
         </div>
@@ -151,6 +152,7 @@ defmodule MusicLibraryWeb.Components.Release do
   attr :already_scrobbled, :boolean, required: true
   attr :selected_tracks, :any, required: true
   attr :myself, :any, required: true
+  attr :record, :any, default: nil
 
   def medium(assigns) do
     ~H"""
@@ -174,17 +176,29 @@ defmodule MusicLibraryWeb.Components.Release do
           {@medium.format}
         </.badge>
       </label>
-      <.button
-        :if={@can_scrobble?}
-        size="sm"
-        disabled={@already_scrobbled || MapSet.size(@selected_tracks) > 0}
-        phx-click="scrobble_medium"
-        phx-value-number={@medium.number}
-        phx-target={@myself}
-        phx-disable-with={gettext("Scrobbling...")}
-      >
-        {medium_scrobble_label(@medium.format)}
-      </.button>
+      <div class="flex items-center gap-2">
+        <.button
+          :if={@record}
+          variant="ghost"
+          size="sm"
+          phx-click="print_medium_tracklist"
+          phx-value-medium-number={@medium.number}
+          phx-target={@myself}
+        >
+          <.icon name="hero-printer" class="h-4 w-4" />
+        </.button>
+        <.button
+          :if={@can_scrobble?}
+          size="sm"
+          disabled={@already_scrobbled || MapSet.size(@selected_tracks) > 0}
+          phx-click="scrobble_medium"
+          phx-value-number={@medium.number}
+          phx-target={@myself}
+          phx-disable-with={gettext("Scrobbling...")}
+        >
+          {medium_scrobble_label(@medium.format)}
+        </.button>
+      </div>
     </div>
     <.track_list
       medium_number={@medium.number}
@@ -431,6 +445,40 @@ defmodule MusicLibraryWeb.Components.Release do
     {:noreply, socket}
   end
 
+  def handle_event("print_medium_tracklist", %{"medium-number" => number}, socket)
+      when release_loaded?(socket.assigns) do
+    release = socket.assigns.release_with_tracks.result
+    record = socket.assigns.record
+    {number, ""} = Integer.parse(number)
+
+    case TracklistPdf.generate_medium(record, release, number) do
+      {:ok, pdf_binary} ->
+        filename = "#{record.title} - Disc #{number} - Tracklist.pdf"
+
+        {:noreply,
+         push_event(socket, "music_library:download", %{
+           data: Base.encode64(pdf_binary),
+           filename: filename,
+           content_type: "application/pdf"
+         })}
+
+      {:error, reason} ->
+        Logger.error("Error generating medium tracklist PDF: #{inspect(reason)}")
+
+        put_toast!(
+          :error,
+          gettext("Error generating tracklist PDF") <>
+            ": " <> ErrorMessages.friendly_message(reason)
+        )
+
+        {:noreply, socket}
+    end
+  end
+
+  def handle_event("print_medium_tracklist", _params, socket) do
+    {:noreply, socket}
+  end
+
   def handle_event("load_release_tracks", _params, socket) do
     selected_release_id = socket.assigns.record.selected_release_id