def song_to_dict(song, include_hash=False, include_user=False, include_replaygain=False, **options):
    data = {
        "id": song.id,
        "artist": song.artist,
        "title": song.title,
        "duration": song.duration,
    }

    if include_hash:
        data["hash"] = song.hash

    if include_user is not None and song.user is not None and song.user.name:
        data["uploader_name"] = song.user.name

    if include_replaygain:
        data["rg_gain"] = song.rg_gain
        data["rg_peak"] = song.rg_peak

    return data


def playlist_song_to_dict(playlist_song, **options):
    user = options.get("user")
    return {
        "id": playlist_song.id,
        "requested_by": "Marietje" if playlist_song.user is None else playlist_song.user.name,
        "song": song_to_dict(playlist_song.song, **options),
        "can_move_down": playlist_song.user is not None and playlist_song.user == user,
    }