import { randomUUID } from 'node:crypto';
import { getDatabase } from '$lib/server/database';
import { createNotification } from '$lib/server/notifications';

export const AUTOMATED_MESSAGE_EVENTS = [
	{ value: 'account.created', label: 'ACCOUNT CREATED', description: 'After a new SHD.build account is created' }
] as const;
export type AutomatedMessageEvent = (typeof AUTOMATED_MESSAGE_EVENTS)[number]['value'];

type MessageRow = Record<string, unknown>;

function parseActions(value: unknown): Array<{ label: string; href: string }> {
	try {
		const parsed = JSON.parse(String(value ?? '[]'));
		if (!Array.isArray(parsed)) return [];
		return parsed
			.filter((item) => item && typeof item.label === 'string' && typeof item.href === 'string')
			.map((item) => ({ label: item.label.slice(0, 60), href: item.href.slice(0, 500) }))
			.slice(0, 8);
	} catch {
		return [];
	}
}

async function deliver(message: MessageRow, deliveryId: string, userId: string) {
	const notificationId = await createNotification({
		userId,
		category: 'isac',
		source: String(message.source),
		title: String(message.title),
		body: String(message.body),
		link: typeof message.link === 'string' ? message.link : null,
		actions: parseActions(message.actions_json),
		mandatory: true
	});
	if (!notificationId) return;
	const database = await getDatabase();
	await (await database.prepare(`UPDATE automated_system_message_deliveries
		SET delivered_at=?,notification_id=? WHERE id=? AND delivered_at IS NULL`))
		.run(new Date().toISOString(), notificationId, deliveryId);
}

export async function triggerAutomatedSystemMessages(input: {
	eventKey: AutomatedMessageEvent;
	userId: string;
	eventId: string;
}) {
	const database = await getDatabase();
	const messages = await (await database.prepare(
		'SELECT * FROM automated_system_messages WHERE event_key=? AND enabled=1 ORDER BY name'
	)).all(input.eventKey);
	const now = new Date();
	for (const message of messages) {
		const existing = await (await database.prepare(`SELECT id FROM automated_system_message_deliveries
			WHERE message_id=? AND user_id=? AND event_key=? AND event_id=?`))
			.get(message.id, input.userId, input.eventKey, input.eventId);
		if (existing) continue;
		const deliveryId = randomUUID();
		const scheduledFor = new Date(now.getTime() + Number(message.send_delay_minutes ?? 0) * 60_000);
		await (await database.prepare(`INSERT OR IGNORE INTO automated_system_message_deliveries
			(id,message_id,user_id,event_key,event_id,scheduled_for,created_at)
			VALUES(?,?,?,?,?,?,?)`)).run(
			deliveryId, message.id, input.userId, input.eventKey, input.eventId,
			scheduledFor.toISOString(), now.toISOString()
		);
		if (Number(message.send_delay_minutes ?? 0) === 0) {
			await deliver(message, deliveryId, input.userId);
		}
	}
}