backend/utils/refreshToken.js

// utils/refreshToken.js
const { oAuth2Client } = require('../config/googleOAuth'); // Import the OAuth client

// Store the user's tokens
let userTokens = {};

// Method to check if the access token is expired and refresh it
async function checkAndRefreshAccessToken() {
    userTokens = {}; // Reset tokens at start
    if (process.env.ACCESS_TOKEN && process.env.REFRESH_TOKEN) {
        userTokens = {
            access_token: process.env.ACCESS_TOKEN,
            refresh_token: process.env.REFRESH_TOKEN,
        };
        oAuth2Client.setCredentials(userTokens);
        console.log('Using tokens from .env file');
    } else {
        console.log('No tokens found in .env file. Please authenticate.');
    }
    
    // console.log(oAuth2Client)
    if (oAuth2Client.isTokenExpiring()) {
        try {
            // Refresh the token if it's expired or about to expire
            const response = await oAuth2Client.refreshAccessToken();
            const newTokens = response.credentials;
            oAuth2Client.setCredentials(newTokens); // Set new credentials
            userTokens = newTokens; // Update tokens

            process.env.ACCESS_TOKEN = newTokens.access_token
            process.env.REFRESH_TOKEN = newTokens.refresh_token

            console.log('Access token refreshed.');
        } catch (error) {
            console.error('Error refreshing access token:', error);
        }
    }
    return userTokens
}

module.exports = { checkAndRefreshAccessToken };