const passport = require('passport');
// const GitHubStrategy = require('passport-github').Strategy;
const LocalStrategy = require('passport-local').Strategy;

import User from '../models/user';

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

passport.deserializeUser((id, done) => {
  User.findById(id, (err, user) => {
    done(err, user);
  });
});

/**
 * Sign in using Email and Password.
 */
passport.use(new LocalStrategy({ usernameField: 'email' }, (email, password, done) => {
  User.findOne({ email: email.toLowerCase() }, (err, user) => { // eslint-disable-line consistent-return
    if (!user) {
      return done(null, false, { msg: `Email ${email} not found.` });
    }
    user.comparePassword(password, (innerErr, isMatch) => {
      if (isMatch) {
        return done(null, user);
      }
      return done(null, false, { msg: 'Invalid email or password.' });
    });
  });
}));

/**
 * Sign in with GitHub.
 */
// TODO add github login
// passport.use(new GitHubStrategy({
//   clientID: process.env.GITHUB_ID,
//   clientSecret: process.env.GITHUB_SECRET,
//   callbackURL: '/auth/github/callback',
//   passReqToCallback: true
// }, (req, accessToken, refreshToken, profile, done) => {
//   if (req.user) {
//     User.findOne({ github: profile.id }, (err, existingUser) => {
//       if (existingUser) {
//         req.flash('errors', { msg: 'There is already a GitHub account that belongs to you. Sign in with that account or delete it, then link it with your current account.' });
//         done(err);
//       } else {
//         User.findById(req.user.id, (err, user) => {
//           user.github = profile.id;
//           user.tokens.push({ kind: 'github', accessToken });
//           user.profile.name = user.profile.name || profile.displayName;
//           user.profile.picture = user.profile.picture || profile._json.avatar_url;
//           user.profile.location = user.profile.location || profile._json.location;
//           user.profile.website = user.profile.website || profile._json.blog;
//           user.save((err) => {
//             req.flash('info', { msg: 'GitHub account has been linked.' });
//             done(err, user);
//           });
//         });
//       }
//     });
//   } else {
//     User.findOne({ github: profile.id }, (err, existingUser) => {
//       if (existingUser) {
//         return done(null, existingUser);
//       }
//       User.findOne({ email: profile._json.email }, (err, existingEmailUser) => {
//         if (existingEmailUser) {
//           req.flash('errors', { msg: 'There is already an account using this email address. Sign in to that account and link it with GitHub manually from Account Settings.' });
//           done(err);
//         } else {
//           const user = new User();
//           user.email = profile._json.email;
//           user.github = profile.id;
//           user.tokens.push({ kind: 'github', accessToken });
//           user.profile.name = profile.displayName;
//           user.profile.picture = profile._json.avatar_url;
//           user.profile.location = profile._json.location;
//           user.profile.website = profile._json.blog;
//           user.save((err) => {
//             done(err, user);
//           });
//         }
//       });
//     });
//   }
// }));