package library

import "testing"

func TestExtractMBIDs_ID3v2(t *testing.T) {
	raw := map[string]interface{}{
		"TXXX:MusicBrainz Album Id":  "abc-123",
		"TXXX:MusicBrainz Artist Id": "def-456",
	}
	a, ar := extractMBIDs(raw)
	if a != "abc-123" || ar != "def-456" {
		t.Errorf("got (%q, %q), want (\"abc-123\", \"def-456\")", a, ar)
	}
}

func TestExtractMBIDs_Vorbis(t *testing.T) {
	raw := map[string]interface{}{
		"MUSICBRAINZ_ALBUMID":  "abc",
		"MUSICBRAINZ_ARTISTID": "def",
	}
	a, ar := extractMBIDs(raw)
	if a != "abc" || ar != "def" {
		t.Errorf("got (%q, %q)", a, ar)
	}
}

func TestExtractMBIDs_MP4(t *testing.T) {
	raw := map[string]interface{}{
		"----:com.apple.iTunes:MusicBrainz Album Id":  "abc",
		"----:com.apple.iTunes:MusicBrainz Artist Id": "def",
	}
	a, ar := extractMBIDs(raw)
	if a != "abc" || ar != "def" {
		t.Errorf("got (%q, %q)", a, ar)
	}
}

func TestExtractMBIDs_MissingKeysReturnEmpty(t *testing.T) {
	a, ar := extractMBIDs(map[string]interface{}{})
	if a != "" || ar != "" {
		t.Errorf("got (%q, %q), want empty", a, ar)
	}
}

func TestExtractMBIDs_MultiValueArtistTakesFirst(t *testing.T) {
	// Some FLAC tags list collaborators as multi-value MUSICBRAINZ_ARTISTID.
	// Minstrel uses the primary release artist; first wins.
	raw := map[string]interface{}{
		"MUSICBRAINZ_ARTISTID": []string{"primary-mbid", "collab-mbid"},
	}
	_, ar := extractMBIDs(raw)
	if ar != "primary-mbid" {
		t.Errorf("got %q, want %q", ar, "primary-mbid")
	}
}

func TestExtractMBIDs_NilEntryIgnored(t *testing.T) {
	raw := map[string]interface{}{
		"TXXX:MusicBrainz Album Id":  nil,
		"TXXX:MusicBrainz Artist Id": "real-id",
	}
	a, ar := extractMBIDs(raw)
	if a != "" {
		t.Errorf("nil album entry should be ignored, got %q", a)
	}
	if ar != "real-id" {
		t.Errorf("artist = %q", ar)
	}
}