import { Account } from "~/shared/types/account";
import { readAccounts, writeAccounts } from "~/server/database";
import { DateTime } from "luxon";

export default defineEventHandler(async (event) => {
	const session = await requireAccountSession(event);
	const body: Pick<Account, "interestedIds" | "timezone"> = await readBody(event);
	if (
		body.interestedIds !== undefined
		&& !(
			!(body.interestedIds instanceof Array)
			|| !body.interestedIds.every(id => typeof id === "string")
		)
	) {
		throw createError({
			status: 400,
			message: "Invalid interestedIds",
		});
	}

	if (body.timezone !== undefined) {
		if (typeof body.timezone !== "string") {
			throw createError({
				status: 400,
				message: "Invalid timezone",
			});
		}
		if (body.timezone.length) {
			const zonedTime = DateTime.local().setZone(body.timezone);
			if (!zonedTime.isValid) {
				throw createError({
					status: 400,
					message: "Invalid timezone: " + zonedTime.invalidExplanation,
				});
			}
		}
	}

	const accounts = await readAccounts();
	const sessionAccount = accounts.find(account => account.id === session.accountId);
	if (!sessionAccount) {
		throw Error("Account does not exist");
	}

	if (body.interestedIds !== undefined) {
		if (body.interestedIds.length) {
			sessionAccount.interestedIds = body.interestedIds;
		} else {
			delete sessionAccount.interestedIds;
		}
	}
	if (body.timezone !== undefined) {
		if (body.timezone)
			sessionAccount.timezone = body.timezone;
		else
			delete sessionAccount.timezone;
	}
	await writeAccounts(accounts);

	// Update Schedule counts.
	await updateScheduleInterestedCounts(accounts);
})