require("./const.js");
var express = require('express');
var app = express();
var uuid = require('uuid');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var passport = require('passport');
var TwitterStrategy = require('passport-twitter').Strategy;

// Set up some config details
var port = 11111;
var TWITTER_KEY = 'zAVJjGpeFJRVov8sBgsfTFZTa';
var TWITTER_SECRET = 'BpHIe92wS66CKaRB9j6CEBb7L0j7QwCyYStMcPXQwhTCrdeFhX';
// End config

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

passport.deserializeUser(function(obj, done) {
  done(null, obj);
});

passport.use(new TwitterStrategy({
    consumerKey: TWITTER_KEY,
    consumerSecret: TWITTER_SECRET,
    callbackURL: "http://127.0.0.1:11111/auth/twitter/callback"
  },
  function(token, tokenSecret, profile, done) {
    // asynchronous verification, for effect...
    process.nextTick(function () {
      return done(null, profile);
    });
  }
));

// Some useful functions

function genChecksum(a, o, e) {
	var sha = require('crypto').createHash('sha256');
  var input = global.SECRET;

	if (a) input += a;
  if (o) input += o;
  if (e) input += e;

	return(sha.update(input).digest("hex"));
}

app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
//  app.use(logger());
app.use(cookieParser());
//  app.use(express.bodyParser());
//  app.use(express.methodOverride());
app.use(session({
  genid: function(req) {
    return uuid.v1();
  },
  secret: global.SECRET,
  resave: false,
  saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(express.static(__dirname + '/public'));


app.get('/ping', function(req, res){
	res.status(200).send(req.user);
});

app.get('/', function (req, res) {
	res.locals.login = req.isAuthenticated();
	res.render('index', {title: "MarkNotes"});
});

app.get('/login', function (req, res) {
	res.locals.login = req.isAuthenticated();
	if (req.isAuthenticated()) {
		res.redirect('/');
	} else {
		res.render('login', {title: "Log in to MarkNotes", user: req.user});
	}
});

app.get('/secret', ensureAuthenticated, function (req, res) {
	res.send('Jahbulon');
});

app.get('/auth/twitter', passport.authenticate('twitter'), function(req, res){
    // The request will be redirected to Twitter for authentication, so this
    // function will not be called.
});

app.get('/auth/twitter/callback',
	passport.authenticate('twitter', { failureRedirect: '/login' }),
	function (req, res) {
		res.redirect('/');
	}
);

app.get('/logout', function(req, res){
  req.logout();
  res.redirect('/');
});

app.get('/api', function (req, res) {
	var url = require('url');
	var output = "";
  var query = url.parse(req.url,true).query;
  var checksum = genChecksum(query.a, query.o, query.e);

  if (checksum === query.cs) {
    output += "Checksum: " + query.cs + "\n";
    output += "Action: " + query.a + "\n";
    output += "Object: " + query.o + "\n";
    output += "Extra: " + query.e + "\n";
    res.send(output);
  } else {
    res.status(403);
    res.send("Failed to authenticate.");
  }
});

var server = app.listen(port, function () {
  var host = server.address().address;
  var port = server.address().port;
  console.log("Server running at http://%s:%s", host, port);
});

function ensureAuthenticated(req, res, next) {
  if (req.isAuthenticated()) { return next(); }
  res.redirect('/login')
}