var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var fs = require("fs");
// Create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({ extended: false })
app.use(express.static('public'));
app.use(bodyParser.json());
var user;
var id=0;
var emails[];

//This is function where the Interface is sent
app.get('/', function (req, res)
{
  res.sendFile( __dirname + "/" + "userinterface.html" );
})


app.post('/register', urlencodedParser, function (req, res) {

	// Prepare output in JSON format
	user =
	{
		"name":req.body.name,
		"email":req.body.email,
		"password":req.body.password

	};

	testEmail = req.body.email;
	console.log( testEmail);
	//Validation of E-mail
	fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data)
	{
    // Note that err here is for handling any error occuring in opening the file
    data = JSON.parse( data );
    var flag = 0;
    for (var user in data){
    	if(testEmail == data[user].email)
    	{
    		flag=1;
    		break;
    	}
    }
/*
	//front end...........
function sendArrays() {
 var arrays = {
  'inProgressArray[]': inProgress,
  'completedArray[]': completed,
  'archivedArray[]': archived
 }
 $.ajax({
  url: "http://127.0.0.1:8081/array",
  type: "POST",
  dataType: 'json',
  contentType: 'application/json',
  data: JSON.stringify(arrays)
 });
}
	//BackEnd............
app.post('/array', function(req, res) {
    var data = req.body;
    arrays = data;
    fs.writeFile(__dirname + "/database/data/" + "user" + thisUser +  ".json",JSON.stringify(data), function (err) {
        if (err) return console.log(err);
        //console.log(JSON.stringify(data));
    });
    res.send('success');
});
*/
    if(flag==0)
	{
		fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data)
		{
			user =
			{
			"name":req.body.name,
			"email":req.body.email,
			"password":req.body.password
			};

			data = JSON.parse( data );
			data[id] = user;
			// counter of users starts from 0.
			//We make array of saved e-mails with its corresponding ids...
			emails.push(req.body.email);
			id=id+1;
			res.sendFile( __dirname + "/" + "finalOfPhase1.html" );

			fs.writeFile(__dirname + "/" + "users.json",JSON.stringify(data), function (err) {
				if (err)
					return console.log(err);
				console.log(JSON.stringify(data));
			});

		});
	} else {
	   	res.sendFile( __dirname + "/" + "Register.html" );
	  }
    });
})
//BackEnd...........................................
			app.post('/array', function(req, res) {
				var data = req.body;
				//Creating JSON file for each user..
				console.log ("Server started and collections cleared.");
														//varialble id//
				fs.writeFile(__dirname + "/data/" + "user" + id + ".json",JSON.stringify(data), function (err) {
					if (err)
						return console.log(err);
					//console.log(JSON.stringify(data));
				});
				res.send('success');
			});



app.post('/logout', function (req, res) {
    res.sendFile( __dirname + "/" + "userinterface.html" );
})

app.get('/register', function (req, res)
{
    res.sendFile( __dirname + "/" + "finalOfPhase1.html" );
})

app.post('/register', urlencodedParser, function (req, res) {

	 fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data)
	 {
       data = JSON.parse( data );
       data["i"] = user["i"];
       console.log( data );
       res.end( JSON.stringify(data));

     fs.writeFile(__dirname + "/" + "users.json",JSON.stringify(data), function (err)
     {
         if (err) return console.log(err);
         console.log(JSON.stringify(data));
     });

    });
})

app.post('/login', urlencodedParser, function (req, res)
 {

  // Get the values of the input text named username & password
  email = req.body.email1;
  password = req.body.password1;

  console.log(email);
  // Read JSON file containing the users to verify that the user is already registered and have access
  fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
    // Note that err here is for handling any error occuring in opening the file
    data = JSON.parse( data );
    var flag = 0;
    for (var user in data) {
      if(email == data[user].email && password==data[user].password){flag = 1; authenticatedUser = user; break;}
      else{flag = 0;  }
    }

    if(flag == 1)
    {
        // Handling verified users by opening their html from the json file.
        //fs.readFile( __dirname + "/" + "tables.json", 'utf8', function (err, tables_data) {
        //tables_data = JSON.parse(tables_data);
        //console.log(tables_data[user].html);
        // necessary in case multiple clicks are commited
        //res.setHeader('X-XSS-Protection', 0);
        // load the html of the user
        res.sendFile( __dirname + "/" + "finalOfPhase1.html" );
    }
    // Handle invalid login by redirecting the user to the login page once again
    else{res.sendFile( __dirname + "/" + "login.html" );}
  });
 })



var server = app.listen(8081, function () {
 var host = server.address().address
 var port = server.address().port
 console.log("Example app listening at http://%s:%s", host, port)
})