var express = require('express');

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


app.use(bodyParser.json());
app.use(express.static(__dirname));

var urlencodedParser = bodyParser.urlencoded({extended : true });


app.use(session({secret:"hayarowanfarah",resave:false,saveUninitialized:true}));



app.get('/dashboard',function(req, res){
  if(!req.session.userIndex){
    return res.status(401).send();
  }

  return res.status(200).send("Welcome to super secret API");



});



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

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

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

app.get('/sendMyTasks', function (req, res) {
  res.json(userTasks);
});


app.get('/logout',urlencodedParser,  function (req,res) {
  delete req.session.userIndex ;
  res.redirect("/");
});

app.post('/login',urlencodedParser,  function (req,res) {
  // load all data
  var data = fs.readFileSync(__dirname + "/" + "users.json",'utf8');
  data = JSON.parse(data);

  // search for user
  var flag = 0 ;
  for(var x in data["users"]){
    if(req.body.demail == data["users"][x].email && req.body.password == data["users"][x].password){
      flag = 1 ;
      user_id = x;
      break;
    }
  }

  if(flag == 1) {
    userTasks = data["users"][req.session.userIndex].tasks;
    console.log("Successfully logged in.");
    req.session.userIndex = user_id ;
    res.redirect("/project");
  } else {
    flag = 0;
    console.log("ERROR");

    res.redirect("/");
  }

});

app.post('/save', urlencodedParser, function(req, res){
 var data = fs.readFileSync(__dirname + "/" + "users.json",'utf8');
 data = JSON.parse(data);
 var tasks = req.body.data;
 data["users"][req.session.userIndex].tasks = tasks;
 fs.writeFile(__dirname + "/" + "users.json" , JSON.stringify(data), function(err){
  if(err) return console.log(err);
  userTasks = data["users"][req.session.userIndex].tasks;
 });
});

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

  var data = fs.readFileSync(__dirname + "/" + "users.json",'utf8');
  data = JSON.parse(data);
  for(var x in data["users"]){
    if(req.body.demail == data["users"][x].email){
      return res.redirect("/");
    }
  }

  var user = {
      "name" : req.body.dname,
      "email" : req.body.demail,
      "password" : req.body.password,
      "tasks" :[]
}
  data["users"].push(user);
  fs.writeFile(__dirname + "/" + "users.json" , JSON.stringify(data), function(err){
    if(err) return console.log(err);
  } );

  res.redirect("/log");

});

var server = app.listen(8001, function () {

  var host = server.address().address
  var port = server.address().port
  var user_id = 0
  var userTasks
  console.log("Example app listening at http://%s:%s", host, port)

})