package service

import "testing"

// Index is an ffmpeg "0:s:N" selector. A bitmap track is unusable but still
// occupies a slot, so skipping it must not shift the following tracks.
func TestSelectSubtitleStreamsCountsSkippedTracks(t *testing.T) {
	streams := []ffprobeStream{
		{CodecType: "video", CodecName: "h264"},
		{CodecType: "audio", CodecName: "aac"},
		{CodecType: "subtitle", CodecName: "hdmv_pgs_subtitle"},
		{CodecType: "subtitle", CodecName: "subrip"},
		{CodecType: "subtitle", CodecName: "ass"},
	}
	streams[3].Tags.Language = "eng"

	got := selectSubtitleStreams(streams)
	if len(got) != 2 {
		t.Fatalf("got %d streams, want 2: %+v", len(got), got)
	}
	if got[0].Index != 1 || got[0].Lang != "eng" || got[0].Label != "ENG" {
		t.Errorf("subrip track = %+v, want index 1 lang eng label ENG", got[0])
	}
	// No language tag, so the name falls back to the selector index.
	if got[1].Index != 2 || got[1].Lang != "track2" {
		t.Errorf("ass track = %+v, want index 2 lang track2", got[1])
	}
}