// Wochen-Rückblick: sonntags 20:00 (Container-TZ, siehe compose) postet der Bot
// eine Zusammenfassung der Woche in den Devlog-Kanal.
import { EmbedBuilder } from 'discord.js';
import { weeklyStats, getSetting, setSetting } from '../db.js';
import { devlogChannelId, publicUrl, brandColor, brandFooter } from '../runtime-settings.js';
import { config } from '../config.js';
import { moduleEnabled } from '../modules.js';
import { tuning } from '../tuning.js';

const CHECK_INTERVAL_MS = 5 * 60 * 1000;

/** Balken-Zeile: `Mo 21.07  ████████ 12` */
function buildBars(perDay) {
    const byDay = new Map(perDay.map((r) => [r.day, r.n]));
    const rows = [];
    let max = 1;
    // Letzte 7 Tage, älteste zuerst
    for (let i = 6; i >= 0; i--) {
        const date = new Date(Date.now() - i * 86400000);
        const key = date.toISOString().slice(0, 10);
        const n = byDay.get(key) ?? 0;
        max = Math.max(max, n);
        rows.push({ date, n });
    }
    const dayFmt = new Intl.DateTimeFormat('de-DE', { weekday: 'short' });
    const dateFmt = new Intl.DateTimeFormat('de-DE', { day: '2-digit', month: '2-digit' });
    return rows
        .map((r) => {
            const bar = '█'.repeat(Math.round((r.n / max) * 14)) || '·';
            return `${dayFmt.format(r.date).padEnd(3)}${dateFmt.format(r.date)}  ${bar} ${r.n}`;
        })
        .join('\n');
}

/** Rückblick-Embed bauen und in den Devlog-Kanal posten */
export async function postWeeklyRecap(client) {
    if (!moduleEnabled('weekly_recap')) return;
    const channelId = devlogChannelId();
    if (!channelId) throw new Error('Kein Devlog-Kanal konfiguriert');

    const channel = await client.channels.fetch(channelId);
    if (!channel?.isTextBased()) throw new Error('Devlog-Kanal nicht gefunden');

    const stats = weeklyStats();
    const totalCommits = stats.perDay.reduce((sum, r) => sum + r.n, 0);
    const repoLine = stats.topRepos
        .map((r) => `**${r.repo.split('/').pop()}** (${r.n})`)
        .join(' · ');

    const embed = new EmbedBuilder()
        .setColor(brandColor())
        .setTitle('📊 Wochen-Rückblick')
        .setURL(`${publicUrl()}/devlogs`)
        .setDescription(
            `\`\`\`\n${buildBars(stats.perDay)}\n\`\`\``
        )
        .addFields(
            { name: 'Commits', value: String(totalCommits), inline: true },
            { name: 'Devlogs', value: String(stats.devlogs), inline: true },
            ...(repoLine ? [{ name: 'Aktive Projekte', value: repoLine, inline: false }] : [])
        )
        .setFooter({ text: brandFooter('WEEKLY'), iconURL: client?.user?.displayAvatarURL?.({ size: 64 }) })
        .setTimestamp();

    await channel.send({ embeds: [embed] });
}

/** Scheduler starten: prüft alle 5 Minuten, ob Sonntag ≥ 20:00 und noch nicht gepostet */
export function scheduleWeeklyRecap(client) {
    const check = async () => {
        if (getSetting('weekly_recap_enabled') === '0') return;

        const now = new Date();
        // Wochentag und Uhrzeit kommen aus den Stellwerten (lokale TZ des Containers)
        if (now.getDay() !== tuning('recap_weekday') || now.getHours() < tuning('recap_hour')) return;

        const today = now.toISOString().slice(0, 10);
        if (getSetting('last_weekly_recap') === today) return;

        try {
            await postWeeklyRecap(client);
            setSetting('last_weekly_recap', today);
            console.log('[weekly] Wochen-Rückblick gepostet');
        } catch (error) {
            console.error('[weekly] Rückblick fehlgeschlagen:', error);
        }
    };
    setInterval(check, CHECK_INTERVAL_MS);
    check();
}