Start making it more robust

- Use structured data for search/render
- Start testing component
- Start testing domain logic

lib/music_brainz/release_search_result.ex

@@ -0,0 +1,39 @@
+defmodule MusicBrainz.ReleaseSearchResult do
+  @enforce_keys [:id, :title, :release_group, :artists, :date, :barcode, :media]
+  defstruct [:id, :title, :release_group, :artists, :date, :barcode, :media]
+
+  alias MusicBrainz.ReleaseGroup
+
+  def from_api_response(r) do
+    %__MODULE__{
+      id: r["id"],
+      title: r["title"],
+      release_group: parse_release_group(r["release-group"]),
+      artists:
+        r["artist-credit"]
+        |> Enum.map(fn ac -> ac["artist"]["name"] end)
+        |> Enum.join(", "),
+      date: r["date"],
+      barcode: r["barcode"],
+      media: parse_media(r["media"])
+    }
+  end
+
+  defp parse_release_group(rg) do
+    %{
+      id: rg["id"],
+      type: ReleaseGroup.parse_type(rg["primary-type"]),
+      title: rg["title"]
+    }
+  end
+
+  defp parse_media(media) do
+    Enum.map(media, fn m ->
+      %{
+        format: m["format"],
+        track_count: m["track-count"],
+        disc_count: m["disc-count"]
+      }
+    end)
+  end
+end