/*
	SPDX-FileCopyrightText: © 2025 Hornwitser <code@hornwitser.no>
	SPDX-License-Identifier: AGPL-3.0-or-later
*/
import { readSubscriptions, writeSubscriptions } from "~/server/database";
import { type ApiSubscription, apiSubscriptionSchema } from "~/shared/types/api";
import { z } from "zod/v4-mini";

const subscriptionSchema = z.strictObject({
	subscription: apiSubscriptionSchema.def.shape.push,
});

export default defineEventHandler(async (event) => {
	const session = await requireServerSession(event);
	const { success, error, data: body } = subscriptionSchema.safeParse(await readBody(event));
	if (!success) {
		throw createError({
			status: 400,
			statusText: "Bad Request",
			message: z.prettifyError(error),
		});
	}
	const subscriptions = await readSubscriptions();
	const existingIndex = subscriptions.findIndex(
		sub => sub.type === "push" && sub.sessionId === session.id
	);
	const subscription: ApiSubscription = {
		type: "push",
		sessionId: session.id,
		push: body.subscription
	};
	if (existingIndex !== -1) {
		subscriptions[existingIndex] = subscription;
	} else {
		subscriptions.push(subscription);
	}
	await writeSubscriptions(subscriptions);
	if (existingIndex !== -1) {
		return { message: "Existing subscription refreshed."};
	}
	return { message: "New subscription registered."};
})