const forbiddenCharsString = ['}', '{', '%', '>', '<', '^', ';', '`', '$', '"', "@", '='];

export function metadataManager(obj) {
    const keys = Object.keys(obj);
    const tags = [
        "album",
        "copyright",
        "title",
        "artist",
        "track",
        "date"
    ]
    let commands = []

    for (const i in keys) {
        if (tags.includes(keys[i]))
            commands.push('-metadata', `${keys[i]}=${obj[keys[i]]}`)
        }
    return commands;
}

export function cleanString(string) {
    for (const i in forbiddenCharsString) {
        string = string.replaceAll("/", "_")
                       .replaceAll(forbiddenCharsString[i], '')
    }
    return string;
}
export function verifyLanguageCode(code) {
    const langCode = String(code.slice(0, 2).toLowerCase());
    if (RegExp(/[a-z]{2}/).test(code)) {
        return langCode
    }
    return "en"
}
export function languageCode(req) {
    if (req.header('Accept-Language')) {
        return verifyLanguageCode(req.header('Accept-Language'))
    }
    return "en"
}
export function cleanHTML(html) {
    let clean = html.replace(/ {4}/g, '');
    clean = clean.replace(/\n/g, '');
    return clean
}

export function getRedirectingURL(url) {
    return fetch(url, { redirect: 'manual' }).then((r) => {
        if ([301, 302, 303].includes(r.status) && r.headers.has('location'))
            return r.headers.get('location');
    }).catch(() => null);
}

export function merge(a, b) {
    for (const k of Object.keys(b)) {
        if (Array.isArray(b[k])) {
            a[k] = [...(a[k] ?? []), ...b[k]];
        } else if (typeof b[k] === 'object') {
            a[k] = merge(a[k], b[k]);
        } else {
            a[k] = b[k];
        }
    }

    return a;
}

export function splitFilenameExtension(filename) {
    const parts = filename.split('.');
    const ext = parts.pop();

    if (!parts.length) {
        return [ ext, "" ]
    } else {
        return [ parts.join('.'), ext ]
    }
}