import passport from 'passport';
import { Strategy as GoogleStrategy } from 'passport-google-oauth20';
import dotenv from 'dotenv';
import User from '../models/User.js';

dotenv.config();

passport.serializeUser((user, done) => {
  done(null, user.id);
});

passport.deserializeUser(async (id, done) => {
  try {
    const user = await User.findById(id);
    done(null, user);
  } catch (err) {
    done(err, null);
  }
});

passport.use(
  new GoogleStrategy(
    {
      clientID: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
      callbackURL: 'http://localhost:5000/auth/google/callback',
      proxy: true
    },
    async (accessToken, refreshToken, profile, done) => {
      try {
        const existingUser = await User.findOne({ googleId: profile.id });
        if (existingUser) {
          return done(null, existingUser);
        }

        const newUser = await new User({
          googleId: profile.id,
          email: profile.emails[0].value,
          name: profile.displayName,
          avatar: profile.photos[0].value,
        }).save();

        done(null, newUser);
      } catch (err) {
        done(err, null);
      }
    }
  )
);