Route artist search queries through Artists context

Closes #113

lib/music_library/artists.ex

@@ -75,6 +75,47 @@ defmodule MusicLibrary.Artists do
     |> Enum.into(%{})
   end
 
+  @spec search_by_name(String.t(), non_neg_integer()) :: [map()]
+  def search_by_name(query, limit) do
+    case String.trim(query) do
+      "" ->
+        []
+
+      trimmed_query ->
+        normalized_query = String.downcase(trimmed_query)
+
+        from(ar in ArtistRecord,
+          join: ai in ArtistInfo,
+          on: ar.musicbrainz_id == ai.id,
+          where:
+            fragment("lower(unaccent(artist ->> '$.name')) LIKE ?", ^"%#{normalized_query}%"),
+          group_by: ar.musicbrainz_id,
+          select: %{artist: ar.artist, image_data_hash: ai.image_data_hash},
+          limit: ^limit,
+          order_by: fragment("artist ->> '$.name'")
+        )
+        |> Repo.all()
+    end
+  end
+
+  @spec search_by_name_count(String.t()) :: non_neg_integer()
+  def search_by_name_count(query) do
+    case String.trim(query) do
+      "" ->
+        0
+
+      trimmed_query ->
+        normalized_query = String.downcase(trimmed_query)
+
+        from(ar in ArtistRecord,
+          where: fragment("lower(artist ->> '$.name') LIKE ?", ^"%#{normalized_query}%"),
+          select: ar.musicbrainz_id,
+          distinct: true
+        )
+        |> Repo.aggregate(:count, :musicbrainz_id)
+    end
+  end
+
   @spec exists?(String.t()) :: boolean()
   def exists?(artist_id) do
     q =

lib/music_library/search.ex

@@ -8,11 +8,7 @@ defmodule MusicLibrary.Search do
   - Artists
   """
 
-  import Ecto.Query, warn: false
-
-  alias MusicLibrary.Artists.ArtistInfo
-  alias MusicLibrary.{Collection, RecordSets, Repo, Wishlist}
-  alias MusicLibrary.Records.ArtistRecord
+  alias MusicLibrary.{Artists, Collection, RecordSets, Wishlist}
 
   @pagination Application.compile_env!(:music_library, :pagination)
 
@@ -62,26 +58,7 @@ defmodule MusicLibrary.Search do
   """
   @spec search_artists(String.t(), non_neg_integer()) :: [map()]
   def search_artists(query, limit \\ @pagination[:search_preview_limit]) do
-    case String.trim(query) do
-      "" ->
-        []
-
-      trimmed_query ->
-        normalized_query = String.downcase(trimmed_query)
-
-        q =
-          from ar in ArtistRecord,
-            join: ai in ArtistInfo,
-            on: ar.musicbrainz_id == ai.id,
-            where:
-              fragment("lower(unaccent(artist ->> '$.name')) LIKE ?", ^"%#{normalized_query}%"),
-            group_by: ar.musicbrainz_id,
-            select: %{artist: ar.artist, image_data_hash: ai.image_data_hash},
-            limit: ^limit,
-            order_by: fragment("artist ->> '$.name'")
-
-        Repo.all(q)
-    end
+    Artists.search_by_name(query, limit)
   end
 
   @doc """
@@ -115,25 +92,6 @@ defmodule MusicLibrary.Search do
   """
   @spec search_artists_count(String.t()) :: non_neg_integer()
   def search_artists_count(query) do
-    case String.trim(query) do
-      "" ->
-        0
-
-      trimmed_query ->
-        normalized_query = String.downcase(trimmed_query)
-
-        # Use a subquery to count distinct musicbrainz_ids
-        subquery =
-          from ar in ArtistRecord,
-            where: fragment("lower(artist ->> '$.name') LIKE ?", ^"%#{normalized_query}%"),
-            select: ar.musicbrainz_id,
-            distinct: true
-
-        q =
-          from s in subquery(subquery),
-            select: count()
-
-        Repo.one(q) || 0
-    end
+    Artists.search_by_name_count(query)
   end
 end

test/music_library/artists_test.exs

@@ -31,6 +31,57 @@ defmodule MusicLibrary.ArtistsTest do
     end
   end
 
+  describe "search_by_name/2" do
+    test "returns artists matching the query" do
+      record = record_with_artist("Marillion")
+      [artist] = record.artists
+      artist_info(artist.musicbrainz_id)
+
+      results = Artists.search_by_name("Marillion", 10)
+
+      assert length(results) == 1
+      assert hd(results).artist.name == "Marillion"
+    end
+
+    test "returns empty list for empty query" do
+      assert Artists.search_by_name("", 10) == []
+      assert Artists.search_by_name("   ", 10) == []
+    end
+
+    test "respects limit" do
+      for name <- ["Marillion", "Steven Wilson"] do
+        record = record_with_artist(name)
+        [artist] = record.artists
+        artist_info(artist.musicbrainz_id)
+      end
+
+      results = Artists.search_by_name("i", 1)
+
+      assert length(results) == 1
+    end
+  end
+
+  describe "search_by_name_count/1" do
+    test "returns count of matching artists" do
+      record = record_with_artist("Marillion")
+      _other = record_with_artist("Marillion")
+
+      [artist] = record.artists
+      artist_info(artist.musicbrainz_id)
+
+      assert Artists.search_by_name_count("Marillion") == 1
+    end
+
+    test "returns 0 for empty query" do
+      assert Artists.search_by_name_count("") == 0
+      assert Artists.search_by_name_count("   ") == 0
+    end
+
+    test "returns 0 for no matches" do
+      assert Artists.search_by_name_count("zzz_nonexistent_zzz") == 0
+    end
+  end
+
   describe "fetch_artist_info/1" do
     test "it stores musicbrainz and discogs data" do
       steven_wilson_musicbrainz_id = "3a51b862-0144-40f6-aa17-6aaeefea29d9"