'use strict';

var passport = require('passport'),
    path = require('path'),
    safe = require('safetydance'),
    bcrypt = require('bcryptjs'),
    uuid = require('uuid/v4'),
    BearerStrategy = require('passport-http-bearer').Strategy,
    LdapStrategy = require('passport-ldapjs').Strategy,
    HttpSuccess = require('connect-lastmile').HttpSuccess;

var LOCAL_AUTH_FILE = path.resolve(process.env.LOCAL_AUTH_FILE || './.users.json');

var gTokenStore = {};

function issueAccessToken() {
    return function (req, res, next) {
        var accessToken = uuid();

        gTokenStore[accessToken] = req.user;

        next(new HttpSuccess(201, { accessToken: accessToken, user: req.user }));
    };
}

passport.serializeUser(function (user, done) {
    console.log('serializeUser', user);
    done(null, user.uid);
});

passport.deserializeUser(function (id, done) {
    console.log('deserializeUser', id);
    done(null, { uid: id });
});

var LDAP_URL = process.env.LDAP_URL;
var LDAP_USERS_BASE_DN = process.env.LDAP_USERS_BASE_DN;

if (LDAP_URL && LDAP_USERS_BASE_DN) {
    console.log('Enable ldap auth');

    exports.login = [ passport.authenticate('ldap'), issueAccessToken() ];
} else {
    console.log('Use local user file:', LOCAL_AUTH_FILE);

    exports.login = [
        function (req, res, next) {
            var users = safe.JSON.parse(safe.fs.readFileSync(LOCAL_AUTH_FILE));
            if (!users) return res.send(401);
            if (!users[req.query.username]) return res.send(401);

            bcrypt.compare(req.query.password, users[req.query.username].passwordHash, function (error, valid) {
                if (error || !valid) return res.send(401);

                req.user = {
                    username: req.query.username
                };

                next();
            });
        },
        issueAccessToken()
    ];
}

var opts = {
    server: {
        url: LDAP_URL,
    },
    base: LDAP_USERS_BASE_DN,
    search: {
        filter: '(|(username={{username}})(mail={{username}}))',
        attributes: ['displayname', 'username', 'mail', 'uid'],
        scope: 'sub'
    },
    uidTag: 'cn',
    usernameField: 'username',
    passwordField: 'password',
};

passport.use(new LdapStrategy(opts, function (profile, done) {
    done(null, profile);
}));

exports.verify = passport.authenticate('bearer', { session: false });

passport.use(new BearerStrategy(function (token, done) {
    if (!gTokenStore[token]) return done(null, false);

    return done(null, gTokenStore[token], { accessToken: token });
}));

exports.logout = function (req, res, next) {
    console.log(req.authInfo);

    delete gTokenStore[req.authInfo.accessToken];

    next(new HttpSuccess(200, {}));
};

exports.getProfile = function (req, res, next) {
    next(new HttpSuccess(200, { username: req.user.username }));
};