Show barcodes that are not found inside the results UI

Includes a refactor to extract/cleanup barcode scan logic from the
component to a separate context with a better API.

lib/music_library/barcode_scan.ex

@@ -0,0 +1,48 @@
+defmodule MusicLibrary.BarcodeScan do
+  alias MusicLibrary.BarcodeScan.Result
+  alias MusicLibrary.Records
+
+  def scan(number) do
+    case MusicBrainz.search_release_by_barcode(number) do
+      {:ok, [best_match_release | _other_releases]} ->
+        format = MusicBrainz.ReleaseSearchResult.format(best_match_release)
+
+        case Records.get_release_status(best_match_release.id, format) do
+          :new ->
+            {:ok, Result.new(number, best_match_release)}
+
+          {:wishlisted, record_id} ->
+            {:ok, Result.wishlisted(number, record_id, best_match_release)}
+
+          {:collected, record_id} ->
+            {:ok, Result.collected(number, record_id, best_match_release)}
+        end
+
+      {:ok, []} ->
+        {:ok, Result.not_found(number)}
+
+      error ->
+        error
+    end
+  end
+
+  def import(scan_result, current_time) do
+    case scan_result.status do
+      :new ->
+        Records.import_from_musicbrainz_release(scan_result.release.id,
+          format: MusicBrainz.ReleaseSearchResult.format(scan_result.release),
+          purchased_at: current_time
+        )
+
+      :wishlisted ->
+        record = Records.get_record!(scan_result.record_id)
+        Records.update_record(record, %{"purchased_at" => current_time})
+
+      :collected ->
+        {:error, :already_collected}
+
+      :not_found ->
+        {:error, :not_found}
+    end
+  end
+end

lib/music_library/barcode_scan/result.ex

@@ -0,0 +1,36 @@
+defmodule MusicLibrary.BarcodeScan.Result do
+  defstruct [:status, :number, :record_id, :release]
+
+  def new(number, release) do
+    %__MODULE__{
+      number: number,
+      status: :new,
+      release: release
+    }
+  end
+
+  def wishlisted(number, record_id, release) do
+    %__MODULE__{
+      number: number,
+      status: :wishlisted,
+      record_id: record_id,
+      release: release
+    }
+  end
+
+  def collected(number, record_id, release) do
+    %__MODULE__{
+      number: number,
+      status: :collected,
+      record_id: record_id,
+      release: release
+    }
+  end
+
+  def not_found(number) do
+    %__MODULE__{
+      number: number,
+      status: :not_found
+    }
+  end
+end

lib/music_library/records.ex

@@ -107,7 +107,11 @@ defmodule MusicLibrary.Records do
           purchased_at: fragment("records.purchased_at")
         }
 
-    Repo.one(q)
+    case Repo.one(q) do
+      nil -> :new
+      %{record_id: record_id, purchased_at: nil} -> {:wishlisted, record_id}
+      %{record_id: record_id} -> {:collected, record_id}
+    end
   end
 
   def get_artist_records(musicbrainz_id) do