/*
 * kyle's nodejs server
 *
 * by default app.settings.env is set to 'development' (process.env.ENV_VARIABLE)
 * $ NODE_ENV=production node app.js
 *
 * ToDo:
 *   - redis for active users
 *   - load from db once, and refetch when necessary
 *   - if (verbose) log; can choose to use process.env and/or app.settings.env
 *   - jsdoc?
 *
 */

var util = require('util');
var crypto = require('crypto')
var path = require('path');
var http = require('http');

var express = require('express');
var io = require('socket.io');
var RedisStore = require('connect-redis')(express);

var db = require('./mydb.js');
var myplatform = require('./router/myplatform.js');
var user = require('./router/user.js');
var index = require('./router/index.js');

var app = express(); /* return function accepting req/res */
var server = http.createServer(app); /* this method takes in a function/callback that it feeds with req/res on 'request' event */
var sio = io.listen(server);

function deadend(req, res, next) {
    util.log('[deadend] couldn\'t serve, requested path: ' + req.url);
    /* collect possible info here */
    /* if (critical_wrong) then; throw new Error('da fuck this entity is doing!'); */
    res.send(404, 'page not found\n');
}

function error_handler(err, req, res, next) { /* error handling, arity of 4 */
    console.error(err.stack);
    res.send(500, 'something broke!\n');
}

/* delete req.session.user on close connection? */
function restrict(req, res, next) {
    if (req.session.user)
    {
        util.log('[restrict] granted ' + req.session.user);
        next();
    }
    else
    {
        util.log('[restrict] blocked access');
        res.send(401, 'access restricted\n');
        /* res.redirect(/login); */
    }
}

app.configure(function() {
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade'); /* no need to specify .jade extension */
    app.set('view options', { pretty: true }); /* avoid html source all in on line or so */

    app.use(express.logger('dev'));
    app.use(express.favicon());
    app.use(express.compress());  /* gzip */
    app.use(express.bodyParser()); /* creates req.body which req.param() uses */
    app.use(express.cookieParser()); /* req.session.* can be populated with user defined vars */
    app.use(express.session({ secret: "keyboard cat", store: new RedisStore() })); /* populates req.session */
    app.use(app.router); /* when there's no match, we go static file handling below */
    app.use(require('stylus').middleware(__dirname + '/public'));
    app.use(express.static(path.join(__dirname, 'public'))); /* GET /stylesheets/style.css */
    app.use(deadend); /* we get here if we couldn't serve */
    app.use(error_handler); /* is this correct? */
});

app.get('/', index.root);
app.get('/create', user.create_get);
app.post('/create', user.create_post);
app.get('/login', user.login_get);
app.post('/login', user.login_post);
//app.all('*', auth.check); /* not applicable, I want router list to hit the end in case auth fails */
app.get('/sys/:id([a-z]+)', restrict, myplatform.system);

server.listen(8081, function() {
    util.log(util.format('[server] listening on port %d in %s mode', this.address().port, app.settings.env));
})
.on('error', function(e) {
    util.log('[server] failed creating server, errno: ' + e.errno);
})
.on('close', function() {
    util.log('[server] server shutdown');
})
.on('clientError', function(exception) {
    util.log('[server] ' + exception);
})
.on('connection', function(socket) {
    /* socket.myid = crypto.createHash('md5').update(socket.remoteAddress + ':' + socket.remotePort).digest('hex'); */
    socket.myip = socket.remoteAddress;
    socket.myport = socket.remotePort;
    util.log('[server] new node connection from ' + socket.remoteAddress + ':' + socket.remotePort);
    socket.on('close', function() {
        /* delete connected_clients */
        util.log('[server] client ' + this.myip + ':' + this.myport + ' closed node connection\n');
    });
});

sio.sockets.on('connection', function(socket) {
    var endpoint = socket.manager.handshaken[socket.id].address;
    /* socket.myid = crypto.createHash('md5').update(socket.remoteAddress + ':' + socket.remotePort).digest('hex'); */
    /* user defined fields */
    socket.myip = endpoint.address;
    socket.myport = endpoint.port;
    util.log('[server] new socket.io connection from ' + endpoint.address + ':' + endpoint.port);
    /* after client logs in, expect him to emit 'login' event, emit should contain tag name and 'logged in' check should be done */
    socket.on('login', function(tag) {
        var client = null;
        if ((client = get_connected_client(tag)) != undefined) {
            util.log('[socket.io] ' + tag + ' is active');
            client.tag.iosocket = socket;
        }
    });
    socket.on('disconnect', function() {
        /* delete connected_clients */
        util.log('[server] client ' + this.myip + ':' + this.myport + ' disconnected from socket.io connection\n');
    });
});