/**
 * Express based http & https server
 *
 * Requires express >= 4
 */
var	  common    = require ('./server/common'),
	  authorize = require ('./server/authorization');
/*
      dbs       = require ('./server/dbs'),
      files     = require ('./server/files');
*/
const fs      = common.fs,			 // file sync, read certificates
      http    = common.http,		 // http handler
      https   = require ('https'),	 // https handler
      express = require ('express'),		 // node server framework
      session = require ('express-session'), // session management (security)
      morgan  = require ('morgan'),			 // logger
      //serveFavicon = require ('serve-favicon'),
      bodyParser = require ('body-parser'),	 // post request bodyparser
      MongoStore = require ('connect-mongo')(session), // use mongodb as session storage
	  Message = require('./database/message.model.js');

var app = express();

/*
 * Init
 */
common   .init ();
authorize.init (common);
//dbs      .init (common);
//files    .init (common);


/*
 * Security
 *
 * TODO: Install helmet
 * https://expressjs.com/de/advanced/best-practice-security.html
 *
 * (Disable Header information: Powerd by Express)
 * -> Information disclosure
 */
app.disable ('x-powered-by');

// Session Management
app.set('trust proxy', 1)			// trust first proxy, neccessary for cookie secure: true flag
app.use (session({
    secret: 'ahhgylhuvh', 			// caesar(3) 2 letter surname
    resave: false,
    saveUninitialized: false,
    cookie: {
        maxAge: 30*24*3600*1000,    // TODO: ttl for session as well (Store)
        secure: true,               // true for https only (since our app works only with https)
    },
    name: 'om.sid',
    store: new MongoStore ({mongooseConnection: common.mongoose.connection, ttl: 30*24*3600}),   // mongoose + connect-mongo
    //store: new MemoryStore ({checkPeriod: 24*3600*1000}),   // memorystore
}));


/*
 * Route Control
 */

// Fastpaths
//app.use (serveFavicon (__dirname + '/public/favicon.ico'));


// Minimal Logging
//app.use (morgan ('dev'));
// Advanced Logging
morgan.token ('user', function (req, res) { return (req.session && req.session.user) || '-'; });
morgan.token ('userColored', function (req, res) {
    var color = 0;
    if (req.session && req.session.roles)
        color = req.session.roles.admin ? 31 // red
              : req.session.roles.user ?  34 // blue
              : 0;                           // no color
     return '\x1b[' + color + 'm' + ((req.session && req.session.user) || '-') + '\x1b[0m';
});
morgan.token ('statusColored', function (req, res) {
    var color = res.statusCode >= 500 ? 31 // red
              : res.statusCode >= 400 ? 33 // yellow
              : res.statusCode >= 300 ? 36 // cyan
              : res.statusCode >= 200 ? 32 // green
              : 0;                         // no color
    return '\x1b[' + color + 'm' + (res.headersSent ? res.statusCode : '-') + '\x1b[0m';
});
app.use (morgan (':date[iso] :statusColored :method :url :userColored :response-time ms :res[content-length]'));

// BodyParser
// Returns middleware that only parses json bodies.
// (https://www.npmjs.com/package/body-parser#bodyparserjsonoptions)
app.use (bodyParser.json());
// Returns middleware that only parses urlencoded bodies
// with qs library (https://www.npmjs.com/package/qs#readme)
app.use (bodyParser.urlencoded({extended: true}));

// API
var api_routes = express.Router(); // express app-object routing

app.use ('/api', api_routes);

// Static Files
// Allow server access to 'public' folder
app.use(express.static(__dirname + '/public'));

// Other stuff is NOT authorized unless logged in
//app.use (authorize.genCheckAuthorized ('user'));

// Uploaded files
//app.use ('/uploads', express.static(__dirname + '/uploads'));

// Configuring the database
//var dbConfig = require('./mongodb.config.js');

common.mongoose.Promise = global.Promise;

// Connecting to the database
// Local db: common.config.dbLocalConn
// Efi db: common.config.dbConn
common.mongoose.connect (common.config.dbLocalConn, {useNewUrlParser: true}) .then( () => {
    console.log("Successfully connected to MongoDB.");
}).catch( err => {
    console.log('Could not connect to MongoDB.');
    process.exit();
});

// No error so far? Then it's a 404!
//app.use (function (req, res, next) { next (common.genError (404, req.url)); });
//app.use (routes.errorHandler (true)); /* true: show stack traces */


/*
 * API
 */
/*
// API allowed for all
api_routes.post ('/login', authorize.login); // /api/login

// Validate all other API calls
api_routes.use (authorize.genCheckAuthorized ('user'));
api_routes.post ('/logout', authorize.logout);

function addRoutes (r) {
    for (var e in r.routes) {
        var params = r.routes[e].params ? "/" + r.routes[e].params : "";
        console.log ("Adding routes for /" + e + params + ":" +
                     (r.routes[e].get ? " get":" ") + (r.routes[e].post ? " post":" ") +
                     (r.routes[e].put ? " put":" ") + (r.routes[e].delete ? " delete":" "));
        if (r.routes[e].get)
            api_routes.get ('/' + e + params, r.routes[e].get);
        if (r.routes[e].post)
            api_routes.post ('/' + e + params, r.routes[e].post);
        if (r.routes[e].put)
            api_routes.put  ('/' + e + params, r.routes[e].put);
        if (r.routes[e].delete)
            api_routes.delete ('/' + e + params, r.routes[e].delete);
    }
}
*/

app.get ('/api/ids', function (req, res) {
    Message.find({},{id: true}) .exec () .then(results => {
        //selects id from message:
        var parsed = [];
        for (var i in results) {
            parsed.push (results[i].id);
        }
        //var parsed = results.map (x => x._id);
        res.send(parsed);
    } )
    .catch(err => {
        console.log (err);
        res .status(500) .json (err);
    });
});

app.get ("/api/msg/:id", function (req, res) {
    Message.findOne ({_id: req.params.id}) .exec (function (err, results){
        if (err) {
            console.log (err);
            res .status(404) .json (err);
        } else {
            console.log(JSON.stringify(results));
            res.json(results);
        }
    });
});

/*app.get ("/api/msg/search/:phrase", function (req, res) {
    Message.find ({$text: {$search: req.params.phrase}) .then (function (err, results){
        if (err) {
            console.log (err);
            res .status(404) .json (err);
        } else {
            console.log(JSON.stringify(results));
            res.json(results);
        }
    });
});
*/
/*function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (var i = 0; i < 5; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}*/

app.post("/api/createMsg", function(req, res){
    //x = mongoose.Types.ObjectId();
    //y = x.toString();
    //var z = makeid();
    console.log("SUbject: "+JSON.stringify(req.body));
	var message = new Message( {subject: req.body.sub, message: req.body.mess, user: req.body.use, tag: req.body.ta } );

	message.save(function(err,result){
		if(err){
            return res .status(401) .send(err.message);
        }else{
            res.json({message: "Message created!!"});
        }
	});
});

/*
addRoutes (dbs);
addRoutes (admin);
addRoutes (files);
*/

/*
 * Servers
 */
http.createServer (app) .listen (common.config.httpPort, function () {
    console.log ("Express http server listening on port " + common.config.httpPort);
});

/*
 * SSL certificates
 *
 * Keys + Certificate in current dir (not servable!)
 * to create (self-signed) SSL certs:
 *
 * openssl genrsa -out privatekey.pem 1024
 * openssl req -new -key privatekey.pem -out certrequest.csr
 * openssl x509 -req -in certrequest.csr -signkey privatekey.pem -out certificate.pem
 * rm certrequest.csr
 */
if (common.config.httpsPort) {
	var options;
	try {
		try {
			// In case it's a real certificate: add CA chain cersts (TODO: use array if required)
			var ca = fs.readFileSync ('keys/ca_cert.pem');
		} catch (e) {
			ca = undefined;
			console.log ("Note: Can't read CA bundle: "+e);
		}
		if (ca != undefined) {
			options = {
				key:  fs.readFileSync ('keys/omkey.pem'),
				cert: fs.readFileSync ('keys/certificate.pem'),
				ca: ca
		};
			https.createServer (options, app) .listen (common.config.httpsPort, function () {
				console.log ("Express https server listening on port " + common.config.httpsPort);
			});
		}
	} catch (e) {
		console.log ("Note: Can't read SSL keys/certs: "+e+"\nDisabling https server");
	}
} else {
	console.log("Note: https server disabled by config");
}

/*
 * Uncaught Exceptions
 */
process.on ("uncaughtException", function (err) {
    console.error ("*** Uncaught Exception:");
    console.error (err.stack);
});