// Geburtstags-Runde: einmal täglich ab 09:00 (Europe/Berlin) gratulieren
// und die Tages-Rolle umhängen (gestern Geburtstag → Rolle wieder weg).
import { getSetting, setSetting, birthdaysToday } from '../db.js';
import { birthdayChannelId, birthdayRoleId, discordGuildId, brandColor2 } from '../runtime-settings.js';
import { brandEmbed } from '../embeds.js';
import { moduleEnabled } from '../modules.js';
import { renderTemplate } from '../templates.js';
import { tuning, everyTuned } from '../tuning.js';

/** Aktuelles Datum/Stunde in Europe/Berlin */
function berlinNow() {
    const parts = new Intl.DateTimeFormat('de-DE', {
        timeZone: 'Europe/Berlin', year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', hour12: false,
    }).formatToParts(new Date());
    const get = (type) => Number(parts.find((p) => p.type === type)?.value);
    return { day: get('day'), month: get('month'), hour: get('hour'), dateKey: `${get('year')}-${get('month')}-${get('day')}` };
}

export async function birthdayTick(client) {
    if (!moduleEnabled('birthdays')) return;
    const { day, month, hour, dateKey } = berlinNow();
    if (hour < tuning('birthday_hour')) return;
    if (getSetting('last_birthday_run') === dateKey) return; // heute schon gelaufen
    setSetting('last_birthday_run', dateKey);

    const guildId = discordGuildId() ?? [...client.guilds.cache.keys()][0];
    const guild = guildId ? await client.guilds.fetch(guildId).catch(() => null) : null;
    const kids = birthdaysToday(day, month);

    // Tages-Rolle: erst bei allen abräumen, dann den heutigen geben
    const roleId = birthdayRoleId();
    if (guild && roleId) {
        const role = await guild.roles.fetch(roleId).catch(() => null);
        if (role) {
            for (const member of role.members.values()) {
                await member.roles.remove(roleId).catch(() => {});
            }
            for (const b of kids) {
                const member = await guild.members.fetch(b.user_id).catch(() => null);
                await member?.roles.add(roleId).catch(() => {});
            }
        }
    }

    if (kids.length === 0) return;
    const channelId = birthdayChannelId();
    if (!channelId) return;
    const channel = await client.channels.fetch(channelId).catch(() => null);
    if (!channel?.isTextBased()) return;

    const mentions = kids.map((b) => `<@${b.user_id}>`).join(' ');
    const many = kids.length > 1;
    const vars = { mentions, count: kids.length };
    await channel.send({
        content: mentions,
        embeds: [
            brandEmbed(client, 'GEBURTSTAG')
                .setColor(brandColor2())
                .setTitle(renderTemplate(many ? 'birthday.title_multi' : 'birthday.title', vars))
                .setDescription(renderTemplate(many ? 'birthday.text_multi' : 'birthday.text', vars)),
        ],
        allowedMentions: { users: kids.map((b) => b.user_id) },
    }).catch(() => {});
    console.log(`[birthday] ${kids.length} Gratulation(en) für den ${day}.${month}.`);
}

export function startBirthdays(client) {
    everyTuned('birthday_interval', 'minutes', () => birthdayTick(client), 'birthday');
    birthdayTick(client).catch(() => {});
}