// Game-Server-Monitor: pollt FiveM-kompatible HTTP-Endpoints (/dynamic.json)
// und pflegt ein persistentes Status-Embed im Status-Kanal + Bot-Presence.
// Setting "gameservers": kommagetrennt "Name=http://ip:30120, Name2=…"
import { ActivityType, EmbedBuilder, Events } from 'discord.js';
import { getSetting, setSetting } from '../db.js';

const CHECK_INTERVAL_MS = 2 * 60 * 1000;
const TIMEOUT_MS = 8000;
const BRAND_YELLOW = 0xf5c518;

function serverList() {
    return (getSetting('gameservers') ?? '')
        .split(',')
        .map((entry) => {
            const [name, ...rest] = entry.split('=');
            const url = rest.join('=').trim().replace(/\/$/, '');
            return name?.trim() && /^https?:\/\//.test(url) ? { name: name.trim(), url } : null;
        })
        .filter(Boolean);
}

/** Einen Server abfragen (FiveM-Format: clients, sv_maxclients, hostname) */
async function queryServer(server) {
    try {
        const res = await fetch(`${server.url}/dynamic.json`, {
            signal: AbortSignal.timeout(TIMEOUT_MS),
            headers: { 'User-Agent': 'd4rkbot-monitor/1.0' },
        });
        if (!res.ok) throw new Error(`HTTP ${res.status}`);
        const data = await res.json();
        return {
            ...server,
            online: true,
            players: Number(data.clients) || 0,
            max: Number(data.sv_maxclients) || 0,
            map: data.mapname ?? null,
        };
    } catch {
        return { ...server, online: false, players: 0, max: 0, map: null };
    }
}

/** Status-Embed bauen */
function buildEmbed(results) {
    const lines = results.map((r) =>
        r.online
            ? `🟢 **${r.name}** — ${r.players}/${r.max} Spieler${r.map ? ` · ${r.map}` : ''}`
            : `🔴 **${r.name}** — offline`
    );
    return new EmbedBuilder()
        .setColor(BRAND_YELLOW)
        .setTitle('🎮 Server-Status')
        .setDescription(lines.join('\n'))
        .setFooter({ text: 'D4RKST3R // STATUS • aktualisiert alle 2 min' })
        .setTimestamp();
}

/** Ein Poll-Durchlauf — exportiert für Tests und den Timer */
export async function monitorTick(client) {
    const servers = serverList();
    const channelId = getSetting('status_channel_id');
    if (servers.length === 0) return;

    const results = await Promise.all(servers.map(queryServer));

    // Bot-Presence: Gesamtspielerzahl (nur wenn mindestens ein Server online)
    const online = results.filter((r) => r.online);
    const totalPlayers = online.reduce((sum, r) => sum + r.players, 0);
    try {
        client.user?.setActivity?.(
            online.length > 0 ? `${totalPlayers} Spieler online` : 'Server offline',
            { type: ActivityType.Watching }
        );
    } catch { /* Presence ist nice-to-have */ }

    // Persistentes Embed im Status-Kanal pflegen (einmal posten, danach editieren)
    if (!channelId) return;
    const channel = await client.channels.fetch(channelId).catch(() => null);
    if (!channel?.isTextBased()) return;

    const embed = buildEmbed(results);
    const messageId = getSetting('status_message_id');
    if (messageId) {
        const existing = await channel.messages.fetch(messageId).catch(() => null);
        if (existing) {
            await existing.edit({ embeds: [embed] });
            return;
        }
    }
    const message = await channel.send({ embeds: [embed] });
    setSetting('status_message_id', message.id);
}

export function startServerMonitor(client) {
    setInterval(() => monitorTick(client).catch((e) => console.error('[monitor] Fehler:', e)), CHECK_INTERVAL_MS);
    client.once(Events.ClientReady, () => monitorTick(client).catch(() => {}));
}