//go:build linux && !android

package mediacontrols

import "testing"

// TestArtURLIsAlwaysAnswered pins the one field in the MPRIS metadata
// dictionary that must be published even when it is empty.
//
// Omitting a field is what an absent value naturally reads as, and it
// is wrong for artwork: KDE's media controller keeps showing the last
// image it was handed, so a track with no cover art displayed the
// cover of whichever earlier album had one — in the taskbar preview,
// where the user has no way to tell it is stale.
func TestArtURLIsAlwaysAnswered(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		meta Metadata
		want string
	}{
		{
			name: "art present",
			meta: Metadata{
				Title:       "Tideline",
				ArtFilePath: "/covers/abc_lg.jpg",
			},
			want: "file:///covers/abc_lg.jpg",
		},
		{
			name: "no art at all",
			meta: Metadata{Title: "Untagged"},
			want: "",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			m := metadataMap(tt.meta, 1)

			got, ok := m["mpris:artUrl"]
			if !ok {
				t.Fatal("mpris:artUrl absent: a missing key " +
					"leaves the previous track's art on screen")
			}

			if got != tt.want {
				t.Errorf("mpris:artUrl = %q, want %q", got, tt.want)
			}
		})
	}
}

// TestEmptyFieldsStayAbsent guards the other half: artUrl is the
// exception, not a new rule for the whole dictionary. A title of ""
// published as "" would make every player show an empty line where it
// would otherwise fall back to the filename.
func TestEmptyFieldsStayAbsent(t *testing.T) {
	t.Parallel()

	m := metadataMap(Metadata{}, 7)

	for _, key := range []string{
		"xesam:title", "xesam:artist", "xesam:album", "mpris:length",
	} {
		if _, ok := m[key]; ok {
			t.Errorf("%s should be omitted when it has no value", key)
		}
	}
}