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// Ideally, we should write to a file and read it at app start in case of crashes.
// An actual SQL database would probably be overkill.
const fs = require("fs");
/** @type Array<{ name: string, number: string }> */
const subscriptions = [];
/**
* @param {string} number
* @param {string} name
*/
function subscribe(number, name) {
const subscription = { name, number };
subscriptions.push(subscription);
void save();
return subscription;
}
/**
* @param {string} number
*/
function isSubscribed(number) {
return subscriptions.some(s => s.number === number);
}
function getSubscriptions() {
/** @type Array<{ name: string, number: string }> */
const clone = [];
for (const subscription of subscriptions) {
clone.push({ ...subscription });
}
return clone;
}
/**
* @param {string} number
*/
function getSubscriptionFromNumber(number) {
return subscriptions.find(sub => sub.number === number);
}
async function save() {
try {
await fs.promises.writeFile('./data.json', JSON.stringify({ subscriptions }));
} catch (err) {
if (typeof err === 'string') {
console.error(`Error writing data: ${err}`);
} else {
console.error(`Error writing data: ${JSON.stringify(err)}`);
}
}
}
function load() {
try {
const json = fs.readFileSync('./data.json');
const data = JSON.parse(json);
while (subscriptions.pop()) {}
subscriptions.push(...data['subscriptions']);
} catch (err){
if (typeof err === 'string') {
console.error(`Error reading data: ${err}`);
} else {
console.error(`Error reading data: ${JSON.stringify(err)}`);
}
}
}
module.exports = {
subscribe,
isSubscribed,
getSubscriptions,
getSubscriptionFromNumber,
load,
};
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