server.js

require('dotenv').config();
const express = require('express');
const axios = require('axios');
const passport = require('passport');
const GitHubStrategy = require('passport-github').Strategy;
const session = require('express-session');
const path = require('path');
const OpenAI = require('openai');

const app = express();
app.use(express.json());
app.use(express.static('public'));
app.use(session({
    secret: 'replace_this_with_a_secure_secret',
    resave: false,
    saveUninitialized: true,
}));

// Passport setup
passport.serializeUser((user, done) => done(null, user));
passport.deserializeUser((obj, done) => done(null, obj));

passport.use(new GitHubStrategy({
    clientID: process.env.GITHUB_CLIENT_ID,
    clientSecret: process.env.GITHUB_CLIENT_SECRET,
    callbackURL: "https://github-roast.up.railway.app/auth/github/callback"
}, (accessToken, refreshToken, profile, done) => done(null, profile)));

app.use(passport.initialize());
app.use(passport.session());

// Route to serve the login page
app.get('/', (req, res) => {
    if (req.isAuthenticated()) {
        res.redirect('/home');
    } else {
        res.sendFile(path.join(__dirname, 'public', 'login.html'));
    }
});

// Route to handle GitHub authentication
app.get('/auth/github', passport.authenticate('github'));

// GitHub callback route
app.get('/auth/github/callback', 
    passport.authenticate('github', { failureRedirect: '/' }),
    (req, res) => res.redirect(`/home?github=${req.user.username}`));

// Protected route to serve the homepage after login
app.get('/home', (req, res) => {
    if (req.isAuthenticated()) {
        res.sendFile(path.join(__dirname, 'public', 'home.html'));
    } else {
        res.redirect('/');
    }
});

const openai = new OpenAI({
    apiKey: process.env.OPENAI_API_KEY_NEW4,
});

// Endpoint to generate a roast
app.get('/roast/:username', async (req, res) => {
    const { username } = req.params;
    try {
        const githubResponse = await axios.get(`https://api.github.com/users/${username}`);
        const profileData = githubResponse.data;

        if (!profileData) return res.status(404).json({ error: "GitHub user not found" });

        const messages = [
            { role: "system", content: "You are a witty assistant asked to create a light-hearted roast." },
            { role: "user", content: `Tell me a roast about a GitHub user named ${profileData.name || username} who has ${profileData.public_repos} repositories and ${profileData.followers} followers.` },
        ];

        const completion = await openai.chat.completions.create({
            messages: messages,
            model: "gpt-3.5-turbo",
        });

        if (completion.choices && completion.choices.length > 0) {
            const roast = completion.choices[0].message.content;
            res.json({ roast });
        } else {
            res.status(500).json({ error: "Failed to generate a roast from AI" });
        }
    } catch (error) {
        console.error('Error:', error);
        res.status(500).json({ error: 'Failed to fetch data or generate roast' });
    }
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => console.log(`Server is running on http://localhost:${PORT}`));