/**
 * Detects common search-engine results pages so they can be allowed while destinations stay blocked.
 * @param {string} url
 * @returns {boolean}
 */
export function isSearchEngineResultsPage(url) {
    if (!url || typeof url !== 'string') {
        return false;
    }

    try {
        const u = new URL(url);
        if (u.protocol !== 'http:' && u.protocol !== 'https:') {
            return false;
        }

        const host = u.hostname.replace(/^www\./, '').toLowerCase();
        const path = u.pathname.toLowerCase();
        const hasQuery = Boolean(u.search && u.search.length > 1);

        if (host === 'google.com' || host.endsWith('.google.com')) {
            return path.startsWith('/search');
        }

        if (host.endsWith('bing.com')) {
            return path.startsWith('/search');
        }

        if (host === 'search.yahoo.com' || (host.endsWith('.yahoo.com') && path.includes('/search'))) {
            return true;
        }

        if (host === 'duckduckgo.com') {
            return path === '/' || path === '/lite' || path.startsWith('/?') || hasQuery;
        }

        if (host === 'ecosia.org') {
            return path.startsWith('/search');
        }

        if (host === 'search.brave.com') {
            return path.startsWith('/search') || hasQuery;
        }

        if (host === 'yandex.com' || host.endsWith('.yandex.com')) {
            return path.startsWith('/search');
        }

        if (host === 'startpage.com' || host === 'www.startpage.com') {
            return path.startsWith('/search') || path.startsWith('/sp/search');
        }

        if (host === 'ask.com') {
            return path.startsWith('/web');
        }

        if (host === 'baidu.com') {
            return path.startsWith('/s') || u.search.includes('wd=');
        }

        if (host === 'vrilsrc.com' || host === 'www.vrilsrc.com') {
            return path === '/' || path.startsWith('/search') || hasQuery;
        }

        return false;
    } catch {
        return false;
    }
}