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 delivery.id AS delivery_id,delivery.user_id,message.*
	FROM automated_system_message_deliveries delivery
	JOIN automated_system_messages message ON message.id=delivery.message_id
	WHERE delivery.delivered_at IS NULL AND delivery.scheduled_for<=? AND message.enabled=1
	ORDER BY delivery.scheduled_for LIMIT 250`)).all(now);
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(/\/+$/, '');
const escapeHtml = (value) => String(value).replace(/[&<>"']/g, (character) => ({
	'&': '&amp;',
	'<': '&lt;',
	'>': '&gt;',
	'"': '&quot;',
	"'": '&#39;'
})[character]);
let delivered = 0;

for (const message of due) {
	const notificationId = randomUUID();
	await (await database.prepare(`INSERT INTO notifications
		(id,user_id,category,source,title,body,link,actions_json,mandatory,created_at)
		VALUES(?,?,'isac',?,?,?,?,?,1,?)`)).run(
		notificationId, message.user_id, message.source, message.title, message.body,
		message.link ?? null, message.actions_json ?? null, now
	);
	await (await database.prepare(`UPDATE automated_system_message_deliveries
		SET delivered_at=?,notification_id=? WHERE id=? AND delivered_at IS NULL`))
		.run(now, notificationId, message.delivery_id);
	const preference = await (await database.prepare(
		"SELECT email_frequency FROM notification_preferences WHERE user_id=? AND category='isac'"
	)).get(message.user_id);
	if (transport && preference?.email_frequency === 'immediate') {
		const identity = await (await database.prepare('SELECT email FROM user_emails WHERE user_id=?')).get(message.user_id);
		if (typeof identity?.email === 'string') {
			try {
				await transport.sendMail({
					from: process.env.SMTP_FROM,
					to: identity.email,
					subject: `SHD.build · ${message.title}`,
					text: `${message.body}\n\n${message.link ? `${origin}${message.link}` : origin}`,
					html: `<div style="background:#0a0c0d;color:#ecebe5;padding:28px;font-family:Arial,sans-serif"><p style="color:#f6a821;font-size:12px;letter-spacing:2px">${escapeHtml(message.source)}</p><h1>${escapeHtml(message.title)}</h1><p style="color:#a5aaab">${escapeHtml(message.body)}</p>${message.link ? `<a style="color:#f6a821" href="${escapeHtml(`${origin}${message.link}`)}">OPEN SHD.BUILD</a>` : ''}</div>`
				});
				await (await database.prepare('UPDATE notifications SET emailed_at=? WHERE id=?')).run(now, notificationId);
			} catch (error) {
				console.error(`Unable to email automated notification ${notificationId}`, error);
			}
		}
	}
	delivered += 1;
}
console.log(`Delivered ${delivered} automated ISAC system notification${delivered === 1 ? '' : 's'}.`);