#!/usr/bin/env node

const fs = require('fs');
const fetch = require('node-fetch');

const getLatestVersion = async (currentVersion) => { 
    const res = await fetch(`https://web.whatsapp.com/check-update?version=${currentVersion}&platform=web`);
    const data = await res.json();
    return data.currentVersion;
};

const getCurrentVersion = () => {
    try {
        const versionFile = fs.readFileSync('./.version');
        return versionFile ? versionFile.toString().trim() : null;
    } catch(_) {
        return null;
    }
};

const updateVersion = async (oldVersion, newVersion) => {
    const readmePath = '../../README.md';
  
    const readme = fs.readFileSync(readmePath);  
    const newReadme = readme.toString().replaceAll(oldVersion, newVersion);

    fs.writeFileSync(readmePath, newReadme);
    fs.writeFileSync('./.version', newVersion);
    
};

(async () => {
    const currentVersion = getCurrentVersion();
    const version = await getLatestVersion(currentVersion);

    console.log(`Current version: ${currentVersion}`);
    console.log(`Latest version: ${version}`);

    if(currentVersion !== version) {
        console.log('Updating files...');
        await updateVersion(currentVersion, version);
        console.log('Updated!');
    } else {
        console.log('No changes.');
    }
})();