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

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.set('view engine', 'pug');
app.set('views', './');

app.get('/hello', function (req, res) {
   res.send('Hello World!');
})

app.get('/form', function (req, res) {
   var htmlFields =  '<body><form method="post" action="/formdata"><table >'+
                        '<tr><td><label for="username">Username:</label></td><td><input type="text" id="username" name="username"></td></tr>'+
                        '<tr><td><label for="password">Password:</label></td><td><input type="password" id="password" name="password"></td></tr>'+
                        '<tr><td><label for="email">Email:</label></td><td><input type="email" id="email" name="email"></td></tr>'+
                        '<tr><td><input type="submit"></td></tr></table>'+
                     '</form></body>';
   res.send(htmlFields);
})

app.post('/formdata', function(req, res, next) {
    res.render('index', { title: 'Result', username: 'Hello '+req.body.username, password: 'Your password is '+req.body.password, email:
       'Your email is '+req.body.email
    });
});

app.get('/jsondata', function (req, res) {
    if (!req.query.json) {
        return res.send('required query json with valid json');
    }

    let body;
    try {
        body = JSON.parse(req.query.json);
    }
    catch (_a) {
        return res.send('invalid json');
    }

    var error='';
    if (!body.username) {
        error+='username not found in json</br>';
    }
    if (!body.password) {
        error+='password not found in json</br>';
    }
    if (!body.email) {
        error+='email not found in json</br>';
    }

    if (error.length>0)
    {
       return res.send(error);
    }

    return res.render('index', { title: 'Result', username: 'Hello '+body.username, password: 'Your password is '+body.password, email:
       'Your email is '+body.email
    });
});

var server = app.listen(8080, function () {
   var host = server.address().address
   var port = server.address().port

   console.log("Example app listening at http://%s:%s", host, port)
})