var express = require('express');
var app = express();
var fs = require("fs");
var bodyParser = require('body-parser');

// Create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({ extended: false })
var authenticatedUser = null;
var session = require("express-session");
app.use(express.static('Front End'));
app.use(bodyParser.json());


// Session

app.use(session({

  secret : "HAHAH999AHAHthis##tod@@am#n##comp%%lexHAHAHAHAH",
  resave : false,
  saveUninitialized :true

})
);

// Email validation funciton
function validateEmail(email)
{
    // using regular expression.
    if (email.length > 0)
    {
      var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
      return re.test(email);
  }
  else
    return false;
}

// Password validation function
function validatePassword(pass)
{
  if (pass.length < 5)
    return false;
  else
    return true;
}

// Username validation function
function validateUsername(name)
{
  if (name.length > 0)
    return /^[a-zA-Z]*$/.test(name);
  else
    return false;
}
// Number of users already registered





/**** This part to handle default request url= localhost:8081 ******/
app.get('/', function (req, res) {
  res.sendFile( __dirname + "/" + "homepage.html" );
})

app.get('/homepage.html', function (req, res) {
  delete req.session.email;
  delete req.session.storedData2;
  res.sendFile( __dirname + "/" + "homepage.html" );
})

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

  if(!req.session.email)
  {


  // Get the values of the input text email & password
  var email = req.body.email;
  var password = req.body.password;
  var userData;
  var loggedIn = false;
  ///consoles
  console.log(email);
  console.log(password);

  // Read JSON file containing the users to verify that the user is already registered and have access
  var data = fs.readFileSync( __dirname + "/" + "users.json", 'utf8');
    // Note that err here is for handling any error occuring in opening the file

     userData = JSON.parse(data);
     var flag = 0;



    for (var user in userData)
    {
      if((email.toLowerCase() === userData[user].email.toLowerCase()))
      {
        console.log ("userCo "+user);
        break;
      }


    }
    console.log(userData[user].id);
if (password === userData[user].password){


        req.session.userNAME = userData[user].username;
        req.session.idUser = userData[user].id;
        console.log(req.session.idUser);
        loggedIn = true;

     if(loggedIn == true)
            {

                  req.session.email = email;
                  ///consoles
                  console.log(password);
                  console.log(userData[user].username);
                  console.log("This is the tasks page");
                  console.log(req.session.idUser);

                  res.sendFile( __dirname + "/" + "ProjectPh1V1.html");
                  ///consoles
                  console.log("herewe areee");

            try {
                    var storedData = fs.readFileSync(__dirname + "/" + req.session.idUser + ".json",  'utf8');

                     req.session.storedData2 = JSON.parse(storedData);

                     req.session.storedData2["name"] = req.session.userNAME;
                    ///consoles
                     console.log(req.session.userNAME);
                     console.log("Line 135: " +req.session.storedData2);
            }catch (ex)
                {
                    ///consoles
                     console.log(ex);

                      req.session.storedData2["name"] = req.session.userNAME;
                    ///consoles
                     console.log(req.session.userNAME);
                }
                    ///consoles
                     console.log(req.session.storedData2);
        }
    else
        {

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

      }

    }

    // Handle invalid login by redirecting the user to the login page once again

 else {
      ///consoles
      console.log("User Not found");

      res.sendFile( __dirname + "/" + "loginerror.html");
    }
}
else {

     res.sendFile( __dirname + "/" + "ProjectPh1V1.html");

  }

  });

 app.get("/arraydata", function (req, res) {
     console.log("storedData2: "+ req.session.storedData2);
    res.send(req.session.storedData2);
});

app.post('/array', function(req, res) {
      ///consoles
      console.log("harby's herbyes");

      var data = req.body;
      ///consoles
      console.log(data);

       fs.writeFile(__dirname + "/" + req.session.idUser + ".json", JSON.stringify(data), function (err) {

               if (err) return console.log(err);
                 ///consoles
                 console.log(JSON.stringify(data));
                 console.log(req.session.idUser);
            });
            ///I don't whether this matters or not
    res.send('success');
    console.log('successsent');

});

 app.post('/register',urlencodedParser, function(req, res)
 {
       ///consoles
       console.log("got here from ajax");

       var data = req.body;
       ///consoles
       console.log(data);

  var  username = data.name;
  var  email = data.email;
  var  password = data.password;
   ///consoles
  console.log(username);
  console.log(email);
  console.log(password);

  var f = 0
  if (validateUsername(username) && validateEmail(email) && validatePassword(password))
    f = 3;
  else if (!validateUsername(username))
    f = -1;
  else if (!validatePassword(password))
    f = -2;

  if (f == 3)
  {
    ///consoles
    console.log("Correct front end validations");

        req.session.idUser = usersCount;
        req.session.userNAME = username;

    newUser = {
      "password" : password,
      "username" : username,
          "email" : email,
          "id" : usersCount
      }

    var flag = 0;
    var usersCount=0
    // Make sure this is a unique email address
    fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
      if (err)

        return console.error(err);

        userData = JSON.parse(data);
        console.log(userData);

        flag = 0;
        ///consoles
        console.log('Going to check if there are duplicates');

        for (var user in userData)
        {

          if(email.toLowerCase() === userData[user].email.toLowerCase())
          {
            flag=1;
            break;
          }

          usersCount++;

        }

      if (flag == 0)
      {
        ///consoles
        console.log("ok no duplicates");

        req.session.idUser = usersCount;
        req.session.userNAME = username;

        // Add user to the JSON file database and show the homepage again
        fs.readFile( __dirname + "/" + "users.json", 'utf8', function (err, data) {
          newUser = {
            "password" : password,
            "username" : username,
                "email" : email,
                "id" : usersCount
            }
            ///consoles
          console.log("read users file!");

          if (err)
            ///consoles
            return console.error(err);

             userData = JSON.parse(data); // Converting it to string.
             userData[usersCount] = newUser;
             ///consoles
             console.log(userData);

          fs.writeFile(__dirname + "/" + "users.json",JSON.stringify(userData), function (err) {

                   if (err)
                       return console.log(err);
                     ///consoles
                   console.log(JSON.stringify(userData));
           })
             res.sendFile( __dirname + "/" + "validregister.html" );

             fs.writeFile(__dirname + "/" + req.session.idUser + ".json",JSON.stringify({"allTasksArray[]":[],"inProgressArray[]":[],"completedArray[]":[],"archivedArray[]":[]}));

             app.get('/homepage.html', function (req, res) {
              delete req.session.email ;
              delete req.session.storedData2;
              res.sendFile( __dirname + "/" + "homepage.html" );
          })

        });



      }
      else
      {
        console.log("Yes, duplicates");

        res.sendFile( __dirname + "/" + "registererror.html");
      }
    })
  }
  else if (f == -2)
  {
    res.sendFile( __dirname + "/" + "passlength.html" );
  }
  else if (f == -1)
  {
    res.sendFile( __dirname + "/" + "usernamewrong.html");
  }
 })

app.get('/ProjectPh1V1.html', function(req, res){

  res.sendFile( __dirname + "/" + "ProjectPh1V1.html" );

})

// Add headers
app.use(function (req, res, next) {

    // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', "http://localhost:8081");

    // Request methods you wish to allow
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    // Request headers you wish to allow
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

    // Set to true if you need the website to include cookies in the requests sent
    // to the API (e.g. in case you use sessions)
    res.setHeader('Access-Control-Allow-Credentials', true);

    // Pass to next layer of middleware
    next();
});

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