/**
 * "Well known" genres and methods for converting between numeric representations of them and the
 * string representation of them.
 */
export default class Genres {
    /**
     * ID3v1 audio genres. Index corresponds to the numeric value of the genre.
     */
    public static readonly AUDIO_GENRES = [
        "Blues",
        "Classic Rock",
        "Country",
        "Dance",
        "Disco",
        "Funk",
        "Grunge",
        "Hip-Hop",
        "Jazz",
        "Metal",
        "New Age",
        "Oldies",
        "Other",
        "Pop",
        "R&B",
        "Rap",
        "Reggae",
        "Rock",
        "Techno",
        "Industrial",
        "Alternative",
        "Ska",
        "Death Metal",
        "Pranks",
        "Soundtrack",
        "Euro-Techno",
        "Ambient",
        "Trip-Hop",
        "Vocal",
        "Jazz+Funk",
        "Fusion",
        "Trance",
        "Classical",
        "Instrumental",
        "Acid",
        "House",
        "Game",
        "Sound Clip",
        "Gospel",
        "Noise",
        "Alternative Rock",
        "Bass",
        "Soul",
        "Punk",
        "Space",
        "Meditative",
        "Instrumental Pop",
        "Instrumental Rock",
        "Ethnic",
        "Gothic",
        "Darkwave",
        "Techno-Industrial",
        "Electronic",
        "Pop-Folk",
        "Eurodance",
        "Dream",
        "Southern Rock",
        "Comedy",
        "Cult",
        "Gangsta",
        "Top 40",
        "Christian Rap",
        "Pop/Funk",
        "Jungle",
        "Native American",
        "Cabaret",
        "New Wave",
        "Psychedelic",
        "Rave",
        "Showtunes",
        "Trailer",
        "Lo-Fi",
        "Tribal",
        "Acid Punk",
        "Acid Jazz",
        "Polka",
        "Retro",
        "Musical",
        "Rock & Roll",
        "Hard Rock",
        "Folk",
        "Folk/Rock",
        "National Folk",
        "Swing",
        "Fusion",
        "Bebop",
        "Latin",
        "Revival",
        "Celtic",
        "Bluegrass",
        "Avantgarde",
        "Gothic Rock",
        "Progressive Rock",
        "Psychedelic Rock",
        "Symphonic Rock",
        "Slow Rock",
        "Big Band",
        "Chorus",
        "Easy Listening",
        "Acoustic",
        "Humour",
        "Speech",
        "Chanson",
        "Opera",
        "Chamber Music",
        "Sonata",
        "Symphony",
        "Booty Bass",
        "Primus", // Because they really deserve their own genre
        "Porn Groove",
        "Satire",
        "Slow Jam",
        "Club",
        "Tango",
        "Samba",
        "Folklore",
        "Ballad",
        "Power Ballad",
        "Rhythmic Soul",
        "Freestyle",
        "Duet",
        "Punk Rock",
        "Drum Solo",
        "A Cappella",
        "Euro-House",
        "Dance Hall",
        "Goa",
        "Drum & Bass",
        "Club-House",
        "Hardcore",
        "Terror",
        "Indie",
        "BritPop",
        "Negerpunk",
        "Polsk Punk",
        "Beat",
        "Christian Gangsta Rap",
        "Heavy Metal",
        "Black Metal",
        "Crossover",
        "Contemporary Christian",
        "Christian Rock",
        "Merengue",
        "Salsa",
        "Thrash Metal",
        "Anime",
        "Jpop",
        "Synthpop"
    ];

    /**
     * DivX video genres. Index corresponds to the numeric value of the genre.
     */
    public static readonly VIDEO_GENRES = [
        "Action",
        "Action/Adventure",
        "Adult",
        "Adventure",
        "Catastrophe",
        "Child's",
        "Claymation",
        "Comedy",
        "Concert",
        "Documentary",
        "Drama",
        "Eastern",
        "Entertaining",
        "Erotic",
        "Extremal Sport",
        "Fantasy",
        "Fashion",
        "Historical",
        "Horror",
        "Horror/Mystic",
        "Humor",
        "Indian",
        "Infomercial",
        "Melodrama",
        "Military & War",
        "Music Video",
        "Musical",
        "Mystery",
        "Nature",
        "Political Satire",
        "Popular Science",
        "Psychological Thriller",
        "Religion",
        "Science Fiction",
        "Scifi Action",
        "Slapstick",
        "Splatter",
        "Sports",
        "Thriller",
        "Western"
    ];

    /**
     * Gets the genre index for a specified audio genre.
     * @param name Name of the genre to lookup
     * @returns Index of the genre in the audio array or 255 if it could not be found.
     */
    public static audioToIndex(name: string): number {
        const index = Genres.AUDIO_GENRES.indexOf(name);
        return index < 0 ? 255 : index;
    }

    /**
     * Gets the audio genre name for a specified index.
     * @param index Index of the genre in the audio genre array. Can be a `number`,
     *     `string` or `string` wrapped in `( )`, if `allowParenthesis` is set
     *     to `true`
     * @param allowParenthesis Whether or not a number wrapped in parentheses is allowed
     * @returns
     *     Genre name if found, or `undefined` if `index` is outside the
     *     bounds of the audio genre array or if `index` is not valid.
     */
    public static indexToAudio(index: number|string, allowParenthesis: boolean): string {
        const safeIndex = typeof(index) === "string"
            ? Genres.stringToByte(index, allowParenthesis)
            : index;
        return Number.isSafeInteger(safeIndex) && safeIndex < Genres.AUDIO_GENRES.length && safeIndex >= 0
            ? Genres.AUDIO_GENRES[safeIndex]
            : undefined;
    }

    public static indexToAudioDirect(index: number|string): string {
        if (typeof(index) === "string") {
            if (!(/\d+/).test(index)) {
                // Non numeric string
                return undefined;
            }

            // Numeric string
            const indexNumber = Number(index);
            return Genres.AUDIO_GENRES[indexNumber];
        }

        // Number
        return Genres.AUDIO_GENRES[index];
    }

    /**
     * Gets the video genre name for a specified index.
     * @param index Index of the genre in the video genre array. Can be a `number`,
     *     `string` or `string` wrapped in `( )` if `allowParenthesis` is set
     *     to `true`
     * @param allowParenthesis Whether or not a number wrapped in parentheses is allowed
     * @returns
     *     Genre name if found, or `undefined` if `index` is outside the
     *     bounds of the video genre array or if `index` is not valid.
     */
    public static indexToVideo(index: number|string, allowParenthesis: boolean): string {
        const safeIndex = typeof(index) === "string"
            ? Genres.stringToByte(index, allowParenthesis)
            : index;
        return Number.isSafeInteger(safeIndex) && safeIndex < Genres.VIDEO_GENRES.length && safeIndex >= 0
            ? Genres.VIDEO_GENRES[safeIndex]
            : undefined;
    }

    /**
     * Gets the genre index for a specified video genre.
     * @param name Name of the genre to lookup
     * @returns Index of the genre in the video array or 255 if it could not be found.
     */
    public static videoToIndex(name: string): number {
        const index = Genres.VIDEO_GENRES.indexOf(name);
        return index < 0 ? 255 : index;
    }

    private static stringToByte(text: string, allowParenthesis: boolean): number {
        if (allowParenthesis) {
            const trimRegex = /^\(+|\)+$/g;
            text = text.replace(trimRegex, "");
        }

        const normalized = text.trim();
        if (!/^\d+$/.test(normalized)) {
            return 255;
        }

        const index = parseInt(normalized, 10);
        return Number.isNaN(index) ? 255 : index;
    }
}