import { Strategy as FacebookStrategy } from 'passport-facebook';
import db from 'api/db';

const { User, Auth } = db.App;

export async function facebookPassportCallback(req, accessToken, refreshToken, profile, done) {
  try {
    const [auth, created] = await Auth.findOrCreate({
      where: {
        provider: profile.provider,
        providerId: profile.id
      }
    });

    let user = req.user;

    if (!user) {
      user = await User.findOne({ where: { email: profile.emails[0].value } });

      if (!user) {
        user = await User.create({
          email: profile.emails[0].value,
          nick: profile.displayName || null,
          birthday: null, // TODO: Use age_range instead of birthday
          photo: (profile.photos && profile.photos.hasOwnProperty('0') && profile.photos[0].value) || null,
          gender: profile.gender || null,
          password: null
        });
      }
    }

    if (created) {
      await user.addAuth(auth);
    }

    await auth.update({ accessToken, refreshToken });

    if (!user.email) {
      user.email = profile.emails[0].value;
      await user.save();
    }

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

export default function facebook(app, passport, config) {
  passport.use(new FacebookStrategy({
    clientID: config.passport.facebook.appId,
    clientSecret: config.passport.facebook.appSecret,
    callbackURL: config.passport.facebook.callbackUrl,
    enableProof: true,
    scope: ['email', 'public_profile', 'user_friends'],
    profileFields: ['id', 'email', 'displayName', 'age_range', 'gender', 'photos'],
    passReqToCallback: true,
  }, facebookPassportCallback));

  app.get('/auth/facebook',
    passport.authenticate('facebook', { display: 'popup' }),
    () => {
      // The request will be redirected to Facebook for authentication, so this
      // function will not be called.
    });

  app.get('/auth/facebook/callback',
    passport.authenticate('facebook', config.passport.facebook));

  app.get('/auth/facebook/loginSuccess', (req, res) => {
    // res.send(JSON.stringify(req.user) + '<script language="javascript">window.close();</script>');
    res.send('<script language="javascript">window.close();</script>');
  });

  app.get('/auth/facebook/loginFail', (req, res) => {
    res.send('<script language="javascript">window.close();</script>');
  });
}