export function collectDocs(docs) {
    // locale copy from layout
    const locale = (window.localStorage && localStorage.getItem('locale') !== 'en-US') ?
        'zh-CN' : 'en-US';
    const docsList = Object.keys(docs)
        .map(key => docs[key])
        .map((value) => {
            if (typeof value !== 'function') {
                return value[locale] || value.index[locale] || value.index;
            }
            return value;
        })
        .map(fn => fn());
    return docsList;
}

export function getMenuItems(moduleData) {
    const menuMeta = moduleData.map((item) => item.meta);
    const menuItems = {};
    menuMeta.sort((a, b) => (
        parseInt(a.order, 10) - parseInt(b.order, 10)
    )).forEach((meta) => {
        const category = meta.category || 'topLevel';
        if (!menuItems[category]) {
            menuItems[category] = {};
        }

        const type = meta.type || 'topLevel';
        if (!menuItems[category][type]) {
            menuItems[category][type] = [];
        }

        menuItems[category][type].push(meta);
    });

    return menuItems;
}

export function ping(url, callback) {
    const img = new Image();
    let done;
    const finish = (status) => {
        if (!done) {
            done = true;
            img.src = '';
            callback(status);
        }
    };
    img.onload = () => finish('responded');
    img.onerror = () => finish('error');
    img.src = url;
    setTimeout(() => finish('timeout'), 1500);
}