/**
 * web/auth.js - Webserver functions for user authentication and registration
 *
 * @author Calvin Montgomery <cyzon@cyzon.us>
 */

var jade = require('jade');
var fs = require('fs');
var path = require('path');
var webserver = require('./webserver');
var sendJade = require('./jade').sendJade;
var Logger = require('../logger');
var $util = require('../utilities');
var db = require('../database');

/**
 * Processes a login request.  Sets a cookie upon successful authentication
 */
function handleLogin(req, res) {
    var name = req.body.name;
    var password = req.body.password;

    if (typeof name !== 'string' || typeof password !== 'string') {
        res.send(400);
        return;
    }

    password = password.substring(0, 100);

    db.users.verifyLogin(name, password, function (err, user) {
        if (err) {
            if (err === 'Invalid username/password combination') {
                Logger.syslog.log('Login failed (bad password): ' + name
                                  + '@' + webserver.ipForRequest(req));
            }
            sendJade(res, 'login', {
                loggedIn: false,
                loginError: err
            });
        } else {
            res.cookie('auth', user.name + ':' + user.hash, {
                expires: new Date(Date.now() + 60*60*1000),
                httpOnly: true
            });
            sendJade(res, 'login', {
                loggedIn: true,
                loginName: user.name,
                redirect: req.body.redirect || req.header('Referrer')
            });
        }
    });
}

/**
 * Handles a GET request for /login
 */
function handleLoginPage(req, res) {
    if (req.cookies.auth) {
        var split = req.cookies.auth.split(':');
        if (split.length === 2) {
            sendJade(res, 'login', {
                wasAlreadyLoggedIn: true,
                loggedIn: true,
                loginName: split[0]
            });
            return;
        }
    }
    sendJade(res, 'login', {
        loggedIn: false
    });
}

/**
 * Handles a request for /logout.  Clears auth cookie
 */
function handleLogout(req, res) {
    res.clearCookie('auth');
    sendJade(res, 'logout', {
        redirect: req.body.redirect || req.header('Referrer')
    });
}

/**
 * Handles a GET request for /register
 */
function handleRegisterPage(req, res) {
    if (req.cookies.auth) {
        var split = req.cookies.auth.split(':');
        if (split.length === 2) {
            sendJade(res, 'register', {
                loggedIn: true,
                loginName: split[0]
            });
            return;
        }
    }
    sendJade(res, 'register', {
        registered: false,
        registerError: false
    });
}

/**
 * Processes a registration request.
 */
function handleRegister(req, res) {
    var name = req.body.name;
    var password = req.body.password;
    var email = req.body.email;
    if (typeof email !== 'string') {
        email = '';
    }
    var ip = webserver.ipForRequest(req);

    if (typeof name !== 'string' || typeof password !== 'string') {
        res.send(400);
        return;
    }

    if (name.length === 0) {
        sendJade(res, 'register', {
            registerError: 'Username must not be empty'
        });
        return;
    }

    if (password.length === 0) {
        sendJade(res, 'register', {
            registerError: 'Password must not be empty'
        });
        return;
    }

    password = password.substring(0, 100);

    if (!$util.isValidEmail(email)) {
        sendJade(res, 'register', {
            registerError: 'Invalid email address'
        });
        return;
    }

    db.users.register(name, password, email, ip, function (err) {
        if (err) {
            sendJade(res, 'register', {
                registerError: err
            });
        } else {
            Logger.syslog.log(ip + ' registered account: ' + name +
                             (email.length > 0 ? ' <' + email + '>' : ''));
            sendJade(res, 'register', {
                registered: true,
                registerName: name,
                redirect: req.body.redirect
            });
        }
    });
}

module.exports = {
    /**
     * Initializes auth callbacks
     */
    init: function (app) {
        app.get('/login', handleLoginPage);
        app.post('/login', handleLogin);
        app.get('/logout', handleLogout);
        app.get('/register', handleRegisterPage);
        app.post('/register', handleRegister);
    }
};