import { connect } from '@tursodatabase/database';
import nodemailer from 'nodemailer';
import { randomUUID } from 'node:crypto';
import { resolve } from 'node:path';

const database = await connect(resolve(process.env.TDR_DATABASE_PATH || './data/shd-build.db'));
const now = new Date().toISOString();
const due = await (await database.prepare(`SELECT * FROM oversight_notification_queue
	WHERE delivered_at IS NULL AND deliver_after<=? ORDER BY user_id,oversight_category,created_at`)).all(now);
const groups = new Map();
for (const item of due) {
	const key = `${item.user_id}:${item.oversight_category}:${item.frequency}:${item.deliver_after}`;
	if (!groups.has(key)) groups.set(key, []);
	groups.get(key).push(item);
}

const smtpConfigured = Boolean(process.env.SMTP_HOST && process.env.SMTP_FROM);
const transport = smtpConfigured ? nodemailer.createTransport({
	host: process.env.SMTP_HOST,
	port: Number(process.env.SMTP_PORT || 587),
	secure: process.env.SMTP_SECURE === 'true',
	auth: process.env.SMTP_USER ? { user: process.env.SMTP_USER, pass: process.env.SMTP_PASSWORD } : undefined,
	requireTLS: process.env.SMTP_SECURE !== 'true',
	disableFileAccess: true,
	disableUrlAccess: true
}) : null;
const origin = (process.env.APP_ORIGIN || 'http://localhost:5173').replace(/\/+$/, '');
let delivered = 0;

for (const items of groups.values()) {
	const first = items[0];
	const categoryLabel = first.oversight_category === 'avatars' ? 'avatar' : 'data change';
	const title = `${items.length} ${categoryLabel} review${items.length === 1 ? '' : 's'} awaiting Oversight`;
	const details = items.slice(0, 10).map((item) => `• ${item.summary}`).join('\n');
	const remainder = items.length > 10 ? `\n• ${items.length - 10} additional review items` : '';
	const body = `${details}${remainder}`;
	const notificationId = randomUUID();
	await (await database.prepare(`INSERT INTO notifications
		(id,user_id,category,source,title,body,link,mandatory,created_at)
		VALUES(?,?,'isac','ISAC OVERSIGHT NETWORK',?,?,?,1,?)`)).run(
		notificationId, first.user_id, title, body, first.link, now
	);
	for (const item of items) {
		await (await database.prepare('UPDATE oversight_notification_queue SET delivered_at=? WHERE id=? AND delivered_at IS NULL')).run(now, item.id);
	}
	const preference = await (await database.prepare(
		"SELECT email_frequency FROM notification_preferences WHERE user_id=? AND category='isac'"
	)).get(first.user_id);
	if (transport && preference?.email_frequency === 'immediate') {
		const identity = await (await database.prepare('SELECT email FROM user_emails WHERE user_id=?')).get(first.user_id);
		if (typeof identity?.email === 'string') {
			try {
				await transport.sendMail({
					from: process.env.SMTP_FROM,
					to: identity.email,
					subject: `SHD.build · ${title}`,
					text: `${body}\n\n${origin}${first.link}`,
					html: `<div style="background:#0a0c0d;color:#ecebe5;padding:28px;font-family:Arial,sans-serif"><p style="color:#f6a821;font-size:12px;letter-spacing:2px">ISAC OVERSIGHT NETWORK</p><h1>${title}</h1><p style="white-space:pre-line;color:#a5aaab">${body}</p><a style="color:#f6a821" href="${origin}${first.link}">OPEN OVERSIGHT QUEUE</a></div>`
				});
				await (await database.prepare('UPDATE notifications SET emailed_at=? WHERE id=?')).run(now, notificationId);
			} catch (error) {
				console.error(`Unable to email Oversight digest ${notificationId}`, error);
			}
		}
	}
	delivered += items.length;
}

console.log(`Delivered ${delivered} queued Oversight review alert${delivered === 1 ? '' : 's'} in ${groups.size} digest${groups.size === 1 ? '' : 's'}.`);