import { fetchStats } from '~~/server/admin.ts';
import { getLocale } from '~~/server/data.ts';

interface PublicStats {
    calculatedAt: number;
    overall: PublicLocaleStats;
    current: Partial<PublicLocaleStats>;
}

interface PublicLocaleStats {
    users: number;
    cards: number;
    pageViews: number;
    visitors: number;
    online: number;
    visitDuration?: number;
    uptime?: number;
    responseTime?: number;
}

export default defineEventHandler(async (event) => {
    const requestedLocale = getLocale(event);
    const db = useDatabase();
    const statsAll = await fetchStats(db);
    if (statsAll === null) {
        throw createError({
            status: 404,
            statusMessage: 'Not Found',
        });
    }

    const stats: PublicStats = {
        calculatedAt: statsAll.calculatedAt,
        overall: {
            users: statsAll.overall.users,
            cards: 0,
            pageViews: statsAll.overall.plausible?.pageviews || 0,
            visitors: statsAll.overall.plausible?.visitors || 0,
            online: statsAll.overall.plausible?.realTimeVisitors || 0,
        },
        current: {},
    };

    for (const [locale, localeStats] of Object.entries(statsAll.locales)) {
        stats.overall.cards += localeStats.users;
        if (locale === requestedLocale) {
            stats.current = {
                cards: localeStats.users,
            };
        }
        if (localeStats.plausible) {
            stats.overall.pageViews += localeStats.plausible.pageviews;
            stats.overall.visitors += localeStats.plausible.visitors;
            stats.overall.online += localeStats.plausible.realTimeVisitors;
            if (locale === requestedLocale) {
                stats.current.pageViews = localeStats.plausible.pageviews;
                stats.current.visitors = localeStats.plausible.visitors;
                stats.current.online = localeStats.plausible.realTimeVisitors;
                stats.current.visitDuration = localeStats.plausible.visit_duration;
            }
        }
        if (localeStats.heartbeat && locale === requestedLocale) {
            stats.current.uptime = localeStats.heartbeat.uptime;
            stats.current.responseTime = localeStats.heartbeat.avgResponseTime;
        }
    }

    return stats;
});