apiServer.js

var express = require('express');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
// require the model with the schema
var Books = require('./Models/books');

// for shoping cart session persistance
const session = require('express-session');
const MongoStore = require('connect-mongo')(session);


var app = express();

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

/////////////////////////////
// STARTING OUR APISERVER //
///////////////////////////

// request mongoose and conection to mongoDB
var mongoose = require('mongoose');
//mongoose.connect('mongodb://localhost:27017/bookshop'); // here we ask to connect our api with our database named bookshop if the database dont exsite mongoose ll create it automaticely

var url = (process.env.DATABASEURL || 'mongodb://localhost:27017/bookshop' );
mongoose.connect(url);

// checking if the conection to mongodb succeded and add log the error if it faild...
var db = mongoose.connection;
db.on('error', console.error.bind(console, '#Mongo DB - connection error:'));






/////////////////////////////
//SETUP SESSION PERSISTANCE//

app.use(session({
  secret: 'mySecretString',
  saveUninitialized: false,
  resave: false,
  cookie: {maxAge: 1000 * 60 * 60 * 24 * 2},
  store: new MongoStore({mongooseConnection: db, ttl: 2 * 24 * 60 * 60}) // 2 day in sec
}));

//----->> SAVE (POST) SESSION CART <<-------

app.post('/cart', function(req, res){
  var cart = req.body;

  req.session.cart = cart;
  req.session.save(function(err){
    if (err){
      console.log(err);
    }
    res.json(req.session.cart);
  })
});

//------->> GET SESSION CART <<-----------

app.get('/cart', function(req, res){
  if(typeof req.session.cart !== 'undefined'){
    res.json(req.session.cart);
  }
});

//END SESSION PERSISTANCE//
//////////////////////////



//------->>POST BOOKS <<-------------
app.post('/books', function(req, res){
  var book = req.body;

  Books.create(book, function(err, books){
    if (err){
      console.log(err);
    }
    res.json(books);
  })
});

//------->>GET BOOKS <<-------------

app.get('/books',function(req, res){
  Books.find(function(err, books){
    if (err){
      console.log(err);
    }
    res.json(books);
  })
});

//------->>DELETE BOOKS <<-------------

app.delete('/books/:_id', function(req, res){
  var query = {_id: req.params._id};

  Books.remove(query, function(err, books){
    if (err){
      console.log(err);
    }
    res.json(books);
  })
});

//------->>UPDATE BOOKS <<-------------

app.put('/books/:_id', function(req, res){
  var book = req.body;
  var query = {_id: req.params._id};
  var update = {
    '$set':{
      title: book.title,
      description: book.description,
      image: book.image,
      price: book.price
    }
  };

  var options = {new: true};

  Books.findOneAndUpdate(query, update, options, function(err, books){
    if (err){
      console.log(err);
    }
    res.json(books);
  })
});


/////////////////////////////
// SET UP BOOKS IMAGE API //

//------->> GET BOOK IMAGE <<--------
app.get('/images/', function(req, res){
  var imgFolder = __dirname + '/public/images/'; // we define the path of the folder where are store the images
  var fs = require('fs'); // we require the FileSysteme
  fs.readdir(imgFolder, function(err, files){
    if(err){
      console.log(err);
    }
    var filesArr = [];
    files.forEach(function(file){
      filesArr.push({name: file});
    });
    res.json(filesArr);
  })

})
// END BOOKS IMAGE API //
/////////////////////////


////////////////
//  END API  //
//////////////

// ADD APP LISTENER ON APISERVER PORT 3001
app.listen(3001, function(err){
  if (err){
    return console.log(err);
  }
  console.log("API server is up and listening on port 3001");
});