express_server.js

const {searchUser, genetateRandomString,specificUrlToSpecificUser, getUserByEmail, userAuthentication,urlsForUserId} = require('./helper');


const express = require('express');
const app = express();
const PORT = 8080;
app.set('view engine', 'ejs');

const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({extended: true}));

const cookieParser = require('cookie-parser');
app.use(cookieParser());


const bcrypt = require('bcrypt');
const saltRounds = 10;
const salt = bcrypt.genSaltSync(saltRounds);

const cookieSession = require('cookie-session');
app.use(cookieSession({
  name: 'session',
  keys: ['key1', 'key2']
}));

const users = {
  'aJ48lW': {
    id: 'aJ48lW',
    email: 'user@example.com',
    password: bcrypt.hashSync('purple-monkey-dinosaur', salt)
  },
  'QJ76lT': {
    id: 'QJ76lT',
    email: 'user2@example.com',
    password: bcrypt.hashSync('dishwasher-funk', salt)
  }
};


const urlDatabase = {
  b6UTxQ: { longURL: 'https://www.tsn.ca', userId: 'aJ48lW' },
  i3BoGr: { longURL: 'https://www.google.ca', userId: 'QJ76lT' },
  fJHT6T: { longURL: 'https://www.cnn.com', userId: 'aJ48lW' }
};


/////////////////////////////// HELPER FUNCTIONS///////////////////////////
//In helper.js file


//////////////////////ROUTEs/////////////////////////////

//1- Get all the available urls in the database object
app.get('/urls', (req, res) => {
  const userId = req.session.user_id;
  const user = searchUser(users, userId);
  const urls = urlsForUserId(urlDatabase, userId);

  let error = '';
  if (!userId) {
    error = 'Register or login first!';
  }
  let templateVars = { urls, user, error};
  res.render('urls_index', templateVars);

});


//2- get a form to add a new URL
app.get('/urls/new', (req, res) => {
  const userId = req.session.user_id;
  if (!userId) {
    res.redirect('/login');
  } else {
    const user = searchUser(users, userId);
    const error = '';
    let templateVars = { error, user };
    res.render('urls_new', templateVars);
  }
});

//3- Post a NEW longURL and submit it in the form, then redirected to the page showing the new longURL along the corresponding shortURL (SHOULD BE COMBINED WITH THE PRIVOUS ROUTE TO ADD A NEW url)
app.post('/urls', (req, res) => {
  const userId = req.session.user_id;
  const user = searchUser(users, userId);
  if (!userId) {
    const error = 'Please register or log in first!';
    let templateVars = {user,  error };
    res.render('urls_new', templateVars);
  } else {
    const userId = req.session.user_id;
    const longURL = req.body.longURL;
    const shortURL = genetateRandomString();
    urlDatabase[shortURL] = {longURL, userId};
    res.redirect(`/urls/${shortURL}`);
  }

});


//5- Get to longURL real web page after clicking on the shortURL (in the url_show page) (redirect)
app.get(`/u/:shortURL`, (req, res) => {
  const redirectShortUrl = req.params.shortURL;

  //6- Render a 404 error page if wrong short URL is requested
  if (!urlDatabase[redirectShortUrl]) {
    res.statusCode = 404;
    res.render('404');
  } else {
    const redirectLongUrl = urlDatabase[redirectShortUrl].longURL;
    res.redirect(redirectLongUrl);
  }
});

//7- Delete a URL from the urlDatabase - DELETE(POST)
app.post('/urls/:shortURL/delete', (req, res) =>{
  //extract the id from the url
  //req.params
  const shortURL = req.params.shortURL;
  const userId = req.session.user_id;

  const resultSearchObj = specificUrlToSpecificUser(userId, shortURL, urlDatabase);
  const user = searchUser(users, userId);
  const urls = urlsForUserId(urlDatabase, userId);

  if (!resultSearchObj.error) {
  //   //delete it from the database
    delete urlDatabase[shortURL];
    res.redirect('/urls');

  }
  // //redirect to /urls
  const error = resultSearchObj.error;
  let templateVars = { urls, user, error};
  res.render('urls_index', templateVars);
});

//8- Update a URL in the urlDatabase - UPDATE(POST)
//8-1- show the requested url page after hitting edit in the database page
app.get('/urls/:shortURL', (req, res) =>{
  //extract the id from the url
  //req.params
  let shortURL = req.params.shortURL;
  const userId = req.session.user_id;
  const user = searchUser(users, userId);
  
  const url = specificUrlToSpecificUser(userId, shortURL, urlDatabase);
  const error = url['error'];
  let  longURL = '';
  if (!error) {
    longURL = url[shortURL].longURL;
  } else {
    shortURL = '---';
  }
  let templateVars = { url, user, error, shortURL, longURL};
  res.render('urls_show', templateVars);
});

//8-2- POST the new longURL value after filling the form of update the longURL and save it to urlDatabase POST(UPDATE)
app.post('/urls/:shortURL', (req, res) =>{
  //extract the shortURL from the url req.params
  //extract the longURL from req.body ONLY if the user has this url in this database
  const userId = req.session.user_id;
  let shortURL = req.params.shortURL;
  let longURL = req.body.longURL;
  
  const url = specificUrlToSpecificUser(userId, shortURL, urlDatabase);
  const error = url['error'];
  //const longURL = url[shortURL].longURL;

  if (!error) {
    //Upadate the url in the database
    urlDatabase[req.params.shortURL].longURL = longURL;
    res.redirect('/urls');
  } else {
    const user = searchUser(users, userId);
    shortURL = '---';
    longURL = '';
    let templateVars = { user, error, shortURL, longURL};
    res.render('urls_show', templateVars);

  }
});


//9-POST a route to logout in the _header partial file
app.post('/logout', (req, res) => {
  delete req.session.user_id;
  res.redirect('urls');
});


//10- GET a route to a page with a registration form (GET) READ
app.get('/register', (req, res) => {
  const userId = req.session.user_id;
  const user = searchUser(users, userId);
  const error = '';
  let templateVars = {user, error};
  if (!userId) {
    res.render('register', templateVars);
  } else {
    res.redirect('urls');
  }
  
});

//11- POST a route to create a new user
app.post('/register',(req, res) => {

  if (!req.body.email || !req.body.password || getUserByEmail(users, req.body.email)) {
    let error = 'Error-Bad request. ';
    error += (getUserByEmail(users, req.body.email)) ? 'Email already exists!' : 'Email/password cannot be empty!';

    res.statusCode = 400;
    const userId = req.session.user_id;
    const user = searchUser(users, userId);
    let templateVars = { user, error};
    res.render('register', templateVars);

  } else {
    const newId = genetateRandomString();
    console.log(req);
    const newUserPassword = bcrypt.hashSync(req.body.password, salt);
    const newUser = {id: newId, email: req.body.email, password: newUserPassword};
    users[newId] = newUser;
    req.session.user_id = newId;
    res.redirect('urls');
  }
});

//12- GET a route to a page contaning a login form (email and password) (login form) GET(READ)
app.get('/login', (req, res) => {
  const error = '';
  const userId = req.session.user_id;
  const user = searchUser(users, userId);
  let templateVars = {user, error};
  if  (!userId) {
    res.render('login', templateVars);
  } else {
    res.redirect('urls');
  }
});
////////////////////////////////////////////////////////////////////////////////////////////////
//13- POST a route to login to an existing user (POST)
app.post('/login',(req, res) => {
  const requestedEmail = req.body.email;
  const requestedPassword = req.body.password;

  if (userAuthentication(users,requestedEmail, requestedPassword)) {
    const userId = getUserByEmail(users, requestedEmail);
    req.session.user_id = userId;
    res.redirect('urls');

  } else {
    const error = 'Error Invalid email/password combination';
    res.statusCode = 403;
    const user = '';
    let templateVars = { user, error};
    res.render('login', templateVars);
  }
});
//////////////////////////////////////////////////////////////////////////////////////////


//14- get to index page or login if the user is not logged in
app.get(`/`, (req, res) => {
  const userId = req.session.user_id;
  console.log(userId);
  if (!userId) {
    res.redirect('/login');
  } else {
    res.redirect('/urls');
  }
    
});

//14- get an error page if a non excisting page was requested
app.get(`*`, (req, res) => {
  res.statusCode = 404;
  res.render('404');
});

app.listen(process.env.PORT || PORT, () => {
  console.log(`Example app listening on port ${PORT}!`);
});