import { readFile, writeFile } from "node:fs/promises";
import { Schedule } from "~/shared/types/schedule";
import { generateDemoSchedule } from "./generate-demo-schedule";

// For this demo I'm just storing the runtime data in JSON files. When making
// this into proper application this should be replaced with an actual database.

const schedulePath = "data/schedule.json"
const subscriptionsPath = "data/subscriptions.json"

export async function readSchedule() {
	let schedule: Schedule;
	try {
		schedule = JSON.parse(await readFile(schedulePath, "utf-8"));
	} catch (err: any) {
		if (err.code !== "ENOENT")
			throw err;
		// Use the demo schedule if nothing is stored yet.
		try {
			schedule = generateDemoSchedule();
		} catch (err) {
			console.error(err);
			throw err;
		}
	}
	return schedule;;
}

export async function writeSchedule(schedule: Schedule) {
	await writeFile(schedulePath, JSON.stringify(schedule, undefined, "\t") + "\n", "utf-8");
}

export async function readSubscriptions() {
	let subscriptions: PushSubscriptionJSON[];
	try {
		subscriptions = JSON.parse(await readFile(subscriptionsPath, "utf-8"));
	} catch (err: any) {
		if (err.code !== "ENOENT")
			throw err;
		subscriptions = [];
	}
	return subscriptions;;
}

export async function writeSubscriptions(subscriptions: PushSubscriptionJSON[]) {
	await writeFile(subscriptionsPath, JSON.stringify(subscriptions, undefined, "\t") + "\n", "utf-8");
}