// load all the things we need
var LocalStrategy = require('passport-local').Strategy;

// load up the user model
var User = require('../app/models/user');

// expose this function to our app using module.exports
module.exports = function(passport) {

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

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

    passport.use('local-signup', new LocalStrategy({
        // by default, local strategy uses username and password, we will override with email
        first_nameField : 'first_name',
        last_nameField : 'last_name',
        usernameField : 'email',
        passwordField : 'password',
        passReqToCallback : true // allows us to pass back the entire request to the callback
    },
    function(req, first_name, last_name, email, password, done) {

        // asynchronous
        // User.findOne wont fire unless data is sent back
        process.nextTick(function() {

            // find a user whose email is the same as the forms email
            // we are checking to see if the user trying to login already exists
            User.findOne({ 'local.email' :  email }, function(err, user) {
                // if there are any errors, return the error
                if (err) {
                    return done(err);
                }

                // check to see if theres already a user with that email
                if (user) {
                    return done(null, false, req.flash('message', 'That email is already taken.'));
                } else {

                    // if there is no user with that email
                    // create the user
                    var newUser = new User();

                    // set the user's local credentials
                    newUser.local.first_name = first_name;
                    newUser.local.last_name = last_name;
                    newUser.local.email = email;
                    newUser.local.password = newUser.generateHash(password);

                    // save the user
                    newUser.save(function(err) {
                        if (err) {
                            throw err;
                        }
                        return done(null, newUser);
                    });
                }

            });

        });

    }));

};