var http = require("http");
var express = require("express");
var session=require("express-session");
var app = express();
app.use(express.static(__dirname));
app.use(session({
 secret: 'z3fran',
 resave: true,
 saveUninitialized: false
}));


app.use(function(req,res,next){
    res.header('Access-Control-Allow-Origin',"*");
    res.header('Access-Control-Allow-Methods','GET,PUT,POST,DELETE');
    res.header('Access-Control-Allow-Headers','Content-Type');
    next();
})
var fs = require("fs");

var bodyParser = require('body-parser');
var urlencodedParser = bodyParser.urlencoded({ extended: false })

 var id=0;
 var errText="";
app.get('/', function (req, res) {
  res.sendFile( __dirname + "/" + "Home.html" );

})
app.get('/error', function (req, res) {
  res.sendFile( __dirname + "/" + "errorLogin.html" );
  app.get('/errorz', function (req, res) {
	  res.end(errText);
  });
})

app.get('/errorup', function(req, res) {
    res.sendFile(__dirname + "/" + "errorsign.html");
    app.get('/errorzz', function(req, res) {
        res.end("This email is already taken,try another one");
    });
})
app.get('/logOut', function (req, res) {

	req.session.destroy();
  res.sendFile( __dirname + "/" + "Home.html" );


})
app.get('/signUp', function (req, res) {

     res.sendFile( __dirname + "/" + "signUp.html" );


})
app.get('/logIn', function (req, res) {

     res.sendFile( __dirname + "/" + "login.html" );


})
app.get('/phase1', function (req, res) {
    //console.log("here");
  res.sendFile( __dirname + "/" + "project.html" );
})
/** response for sign up submit button **/
app.post('/list_Users', urlencodedParser, function (req, res) {
// Prepare output in JSON format
  username = req.body.user;
  password = req.body.password;
  email= req.body.email;


fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
    data = JSON.parse( data );
    var flag=0;
    for (var i=0;i<data["id"].count;i++){
        if (email==data["users"][i].email){
            flag=1;
            break;
        }
    }
    if (flag==0){
    data['users'].push({"name":username,"password":password,"email":email,"id":data['id'].count, "data":""});
	id=data['id'].count;
    req.session.unique=id;
	req.session.save(function(){
		console.log("session saved");
	});
	console.log("sign up");

    data['id'].count++;
	fs.writeFile(__dirname + "/" + "employes.json",JSON.stringify(data), function (err) {
        if (err) return console.log("Error in opening employes json file");
        //console.log(JSON.stringify(data));
      });

    res.redirect('/logIn');

    }
    else{
		res.redirect('/errorup');

    }

    res.end("");


  });

 })
 app.get('/onload', urlencodedParser, function (req, res) {
 // Prepare output in JSON format


fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
    var data = JSON.parse(data);
	if (req.session.unique<=data['id'].count){
    var obj = data['users'][req.session.unique].data;
     if ((obj!=undefined)&&(obj!="")){
    var list= JSON.parse(obj);
	console.log("onload server");

    res.end(JSON.stringify(list));
    }

 else{
	 console.log("empty data");
	 res.end();
 }
	}
	else
	{
		//res.redirect("/");
		console.log("error with id out of bound");
    }
});

 })
 app.get('/getname', urlencodedParser, function (req, res) {
	 if (req.session.name){
   res.end(req.session.name);
	 }
 })
 app.post('/tryjson', urlencodedParser, function (req, res) {
 // Prepare output in JSON format
           var obj=req.body.array;

fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
    data = JSON.parse(data);

	if ((obj!=undefined)&&(obj!="")){
    data['users'][req.session.unique].data=obj;
	}
    fs.writeFile(__dirname + "/" + "employes.json",JSON.stringify(data), function (err) {
        if (err) return console.log("Error in opening employes json file");

      });
});
   res.end("");
 })

 app.post('/log_in', urlencodedParser, function (req, res) {
// Prepare output in JSON format

  pw = req.body.password;
  emailz= req.body.email;


fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
 data = JSON.parse( data );
    flag=0;
    for (var i=0;i<data["id"].count;i++){
        if (emailz==data["users"][i].email){
			flag=1;
			if (data["users"][i].password==pw){
				id=data["users"][i].id;
				req.session.unique=id;
				req.session.name = data["users"][i].name;
				req.session.save();
			}
			else
			{
				flag=2;
			}

            break;
        }
    }
    if (flag==0){
    errText="The email of the user was not found in the database";
	console.log("user not found");
        res.redirect('/error');

    }
	else if (flag==2){
		 errText="Invalid password";
	console.log("incorrect passowrd");
        res.redirect('/error');
	}
    else{

	console.log("sign in");
    res.redirect('/phase1');

    }

    res.end("");


  });

 })



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)
 })