feat(uploads): preview storage paths, detect templates, attach covers and withdraw batches

services/api/internal/library/meta/template_suggest_test.go

@@ -0,0 +1,22 @@
+package meta
+
+import "testing"
+
+func TestSuggestFromSamplesUsesDominantLayoutWithoutRegexes(t *testing.T) {
+	samples := []TemplateSample{
+		{RelPath: "Кино/Группа крови (1988)/01. Группа крови.flac", Input: in(Fields{Artist: "Кино", Album: "Группа крови", Title: "Группа крови", Year: "1988", Track: "1"}, 1, "flac")},
+		{RelPath: "Кино/Группа крови (1988)/02. Закрой за мной дверь.flac", Input: in(Fields{Artist: "Кино", Album: "Группа крови", Title: "Закрой за мной дверь", Year: "1988", Track: "2"}, 1, "flac")},
+		{RelPath: "Queen/Jazz (1978)/03. Jealousy.mp3", Input: in(Fields{Artist: "Queen", Album: "Jazz", Title: "Jealousy", Year: "1978", Track: "3"}, 1, "mp3")},
+		{RelPath: "Other - Song.flac", Input: in(Fields{Artist: "Other", Album: "Single", Title: "Song"}, 1, "flac")},
+	}
+	got, err := SuggestFromSamples(nil, samples)
+	if err != nil || got.Template != "{albumartist}/{album} ({year})/{track:02}. {title}.{ext}" || got.Matched != 3 || got.Total != 4 || len(got.Examples) != 3 {
+		t.Fatalf("suggestion = %+v, err = %v", got, err)
+	}
+}
+
+func TestSuggestFromSamplesDoesNotGuessWithoutMetadata(t *testing.T) {
+	if _, err := SuggestFromSamples(nil, []TemplateSample{{RelPath: "unknown/file.flac"}}); err == nil {
+		t.Fatal("cannot infer a safe layout without matching metadata")
+	}
+}