function ownKeys(e, r) {
    var t = Object.keys(e);
    if (Object.getOwnPropertySymbols) {
        var o = Object.getOwnPropertySymbols(e);
        r &&
            (o = o.filter(function (r) {
                return Object.getOwnPropertyDescriptor(e, r).enumerable;
            })),
            t.push.apply(t, o);
    }
    return t;
}
function _objectSpread(e) {
    for (var r = 1; r < arguments.length; r++) {
        var t = null != arguments[r] ? arguments[r] : {};
        r % 2
            ? ownKeys(Object(t), !0).forEach(function (r) {
                _defineProperty(e, r, t[r]);
            })
            : Object.getOwnPropertyDescriptors
                ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t))
                : ownKeys(Object(t)).forEach(function (r) {
                    Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r));
                });
    }
    return e;
}
function _defineProperty(obj, key, value) {
    key = _toPropertyKey(key);
    if (key in obj) {
        Object.defineProperty(obj, key, {
            value: value,
            enumerable: true,
            configurable: true,
            writable: true,
        });
    }
    else {
        obj[key] = value;
    }
    return obj;
}
function _toPropertyKey(t) {
    var i = _toPrimitive(t, 'string');
    return 'symbol' == typeof i ? i : i + '';
}
function _toPrimitive(t, r) {
    if ('object' != typeof t || !t)
        return t;
    var e = t[Symbol.toPrimitive];
    if (void 0 !== e) {
        var i = e.call(t, r || 'default');
        if ('object' != typeof i)
            return i;
        throw new TypeError('@@toPrimitive must return a primitive value.');
    }
    return ('string' === r ? String : Number)(t);
}
const BOOK = new Set(['book', 'inbook', 'bookinbook', 'suppbook']);
const BOOK_PART = new Set(['inbook', 'bookinbook', 'suppbook']);
const COLLECTION = new Set([
    'collection',
    'reference',
    'incollection',
    'inreference',
    'suppcollection',
]);
const COLLECTION_PART = new Set(['incollection', 'inreference', 'suppcollection']);
const PROCEEDINGS = new Set(['proceedings', 'inproceedings']);
const PROCEEDINGS_PART = new Set(['inproceedings']);
const PERIODICAL_PART = new Set(['article', 'suppperiodical']);
const TITLE_MAP = {
    mvbook: ['main', BOOK],
    mvcollection: ['main', COLLECTION],
    mvreference: ['main', COLLECTION],
    mvproceedings: ['main', PROCEEDINGS],
    book: ['book', BOOK_PART],
    collection: ['book', COLLECTION_PART],
    reference: ['book', COLLECTION_PART],
    proceedings: ['book', PROCEEDINGS_PART],
    periodical: ['journal', PERIODICAL_PART],
};
export function crossref(target, entry, registry) {
    if (entry.crossref in registry) {
        const parent = registry[entry.crossref];
        if (parent.properties === entry) {
            return entry;
        }
        const data = _objectSpread({}, crossref(parent.type, parent.properties, registry));
        delete data.ids;
        delete data.crossref;
        delete data.xref;
        delete data.entryset;
        delete data.entrysubtype;
        delete data.execute;
        delete data.label;
        delete data.options;
        delete data.presort;
        delete data.related;
        delete data.relatedoptions;
        delete data.relatedstring;
        delete data.relatedtype;
        delete data.shortand;
        delete data.shortandintro;
        delete data.sortkey;
        if ((parent.type === 'mvbook' || parent.type === 'book') && BOOK_PART.has(target)) {
            data.bookauthor = data.author;
        }
        if (parent.type in TITLE_MAP) {
            const [prefix, targets] = TITLE_MAP[parent.type];
            if (targets.has(target)) {
                data[prefix + 'title'] = data.title;
                data[prefix + 'subtitle'] = data.subtitle;
                if (prefix !== 'journal') {
                    data[prefix + 'titleaddon'] = data.titleaddon;
                }
                delete data.title;
                delete data.subtitle;
                delete data.titleaddon;
                delete data.shorttitle;
                delete data.sorttitle;
                delete data.indextitle;
                delete data.indexsorttitle;
            }
        }
        return Object.assign(data, entry);
    }
    return entry;
}
