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‎app.js

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const path = require('path');
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const express = require('express');
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const bodyParser = require('body-parser');
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const errorController = require('./controllers/error');
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const app = express();
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app.set('view engine', 'ejs');
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app.set('views', 'views');
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const adminRoutes = require('./routes/admin');
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const shopRoutes = require('./routes/shop');
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app.use(bodyParser.urlencoded({ extended: false }));
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app.use(express.static(path.join(__dirname, 'public')));
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app.use('/admin', adminRoutes);
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app.use(shopRoutes);
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app.use(errorController.get404);
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app.listen(3000);
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// https://www.publicdomainpictures.net/pictures/10000/velka/1-1210009435EGmE.jpg

‎controllers/admin.js

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const Product = require('../models/product');
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exports.getAddProduct = (req, res, next) => {
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res.render('admin/edit-product', {
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pageTitle: 'Add Product',
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path: '/admin/add-product',
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editing: false
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});
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};
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exports.postAddProduct = (req, res, next) => {
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const title = req.body.title;
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const imageUrl = req.body.imageUrl;
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const price = req.body.price;
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const description = req.body.description;
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const product = new Product(null, title, imageUrl, description, price);
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product.save();
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res.redirect('/');
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};
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exports.getEditProduct = (req, res, next) => {
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const editMode = req.query.edit;
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if (!editMode) {
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return res.redirect('/');
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}
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const prodId = req.params.productId;
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Product.findById(prodId, product => {
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if (!product) {
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return res.redirect('/')
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}
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res.render('admin/edit-product', {
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pageTitle: 'Edit Product',
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path: '/admin/edit-product',
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editing: editMode,
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product: product
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});
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});
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};
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exports.postEditProduct = (req, res, next) => {
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const prodId = req.body.productId;
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const updatedTitle = req.body.title;
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const updatedPrice = req.body.price;
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const updatedImageUrl = req.body.imageUrl;
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const updatedDesc = req.body.description;
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const updatedProduct = new Product(
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prodId,
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updatedTitle,
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updatedImageUrl,
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updatedDesc,
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updatedPrice
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);
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updatedProduct.save();
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res.redirect('/admin/products');
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};
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exports.getProducts = (req, res, next) => {
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Product.fetchAll(products => {
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res.render('admin/products', {
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prods: products,
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pageTitle: 'Admin Products',
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path: '/admin/products'
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});
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});
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};
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exports.postDeleteProduct = (req, res, next) => {
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const prodId = req.body.productId;
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Product.deleteById(prodId);
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res.redirect('/admin/products');
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};

‎controllers/error.js

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exports.get404 = (req, res, next) => {
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res.status(404).render('404', { pageTitle: 'Page Not Found', path: '/404' });
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};

‎controllers/shop.js

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const Product = require('../models/product');
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const Cart = require('../models/cart');
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exports.getProducts = (req, res, next) => {
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Product.fetchAll(products => {
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res.render('shop/product-list', {
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prods: products,
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pageTitle: 'All Products',
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path: '/products'
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});
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});
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};
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exports.getProduct = (req, res, next) => {
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const prodId = req.params.productId;
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Product.findById(prodId, product => {
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res.render('shop/product-detail', {
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product: product,
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pageTitle: product.title,
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path: '/products'
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});
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});
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};
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exports.getIndex = (req, res, next) => {
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Product.fetchAll(products => {
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res.render('shop/index', {
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prods: products,
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pageTitle: 'Shop',
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path: '/'
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});
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});
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};
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exports.getCart = (req, res, next) => {
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Cart.getCart(cart => {
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Product.fetchAll(products => {
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const cartProducts = [];
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for (product of products) {
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const cartProductData = cart.products.find(prod => prod.id === product.id);
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if (cartProductData) {
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cartProducts.push({ productData: product, qty: cartProductData.qty });
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}
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}
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res.render('shop/cart', {
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path: '/cart',
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pageTitle: 'Your Cart',
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products: cartProducts
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});
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});
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});
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};
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exports.postCart = (req, res, next) => {
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const prodId = req.body.productId;
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Product.findById(prodId, product => {
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Cart.addProduct(prodId, product.price);
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});
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res.redirect('/cart');
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};
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exports.postCartDeleteProduct = (req, res, next) => {
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const prodId = req.body.productId;
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Product.findById(prodId, product => {
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Cart.deleteProduct(prodId, product.price);
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res.redirect('/cart');
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});
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}
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exports.getOrders = (req, res, next) => {
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res.render('shop/orders', {
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path: '/orders',
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pageTitle: 'Your Orders'
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});
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};
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exports.getCheckout = (req, res, next) => {
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res.render('shop/checkout', {
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path: '/checkout',
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pageTitle: 'Checkout'
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});
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};

‎data/cart.json

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{"products":[],"totalPrice":0}

‎data/products.json

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[{"id":"0.8380178655222026","title":"Alchemist","imageUrl":"https://www.publicdomainpictures.net/pictures/10000/velka/1-1210009435EGmE.jpg","description":"An Adventure Journey Book By Paulo Cohelo","price":"20.55"}]

‎models/cart.js

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const fs = require('fs');
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const path = require('path');
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const p = path.join(
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path.dirname(process.mainModule.filename),
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'data',
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'cart.json'
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);
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module.exports = class Cart {
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static addProduct(id, productPrice) {
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// Fetch the previous cart
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fs.readFile(p, (err, fileContent) => {
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let cart = { products: [], totalPrice: 0 };
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if (!err) {
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cart = JSON.parse(fileContent);
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}
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// Analyze the cart => Find existing product
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const existingProductIndex = cart.products.findIndex(
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prod => prod.id === id
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);
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const existingProduct = cart.products[existingProductIndex];
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let updatedProduct;
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// Add new product/ increase quantity
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if (existingProduct) {
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updatedProduct = { ...existingProduct };
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updatedProduct.qty = updatedProduct.qty + 1;
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cart.products = [...cart.products];
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cart.products[existingProductIndex] = updatedProduct;
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} else {
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updatedProduct = { id: id, qty: 1 };
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cart.products = [...cart.products, updatedProduct];
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}
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cart.totalPrice = cart.totalPrice + +productPrice;
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fs.writeFile(p, JSON.stringify(cart), err => {
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console.log(err);
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});
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});
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}
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static deleteProduct(id, productPrice) {
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fs.readFile(p, (err, fileContent) => {
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if (err) {
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return;
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}
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const updatedCart = { ...JSON.parse(fileContent) };
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const product = updatedCart.products.find(prod => prod.id === id);
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if (!product) {
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return;
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}
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const productQty = product.qty;
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updatedCart.products = updatedCart.products.filter( prod => prod.id !== id );
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updatedCart.totalPrice = updatedCart.totalPrice - productPrice * productQty;
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fs.writeFile(p, JSON.stringify(updatedCart), err => {
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console.log(err);
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});
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});
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}
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static getCart(cb) {
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fs.readFile(p, (err, fileContent) => {
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const cart = JSON.parse(fileContent);
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if (err) {
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cb(null);
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} else {
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cb(cart);
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}
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});
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}
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};

‎models/product.js

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const fs = require('fs');
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const path = require('path');
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const Cart = require('./cart');
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const p = path.join(
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path.dirname(process.mainModule.filename),
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'data',
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'products.json'
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);
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const getProductsFromFile = cb => {
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fs.readFile(p, (err, fileContent) => {
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if (err) {
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cb([]);
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} else {
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cb(JSON.parse(fileContent));
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}
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});
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};
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module.exports = class Product {
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constructor(id, title, imageUrl, description, price) {
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this.id = id;
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this.title = title;
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this.imageUrl = imageUrl;
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this.description = description;
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this.price = price;
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}
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save() {
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getProductsFromFile(products => {
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if (this.id) {
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const existingProductIndex = products.findIndex(
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prod => prod.id === this.id
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);
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const updatedProducts = [...products];
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updatedProducts[existingProductIndex] = this;
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fs.writeFile(p, JSON.stringify(updatedProducts), err => {
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console.log(err);
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});
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} else {
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this.id = Math.random().toString();
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products.push(this);
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fs.writeFile(p, JSON.stringify(products), err => {
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console.log(err);
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});
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}
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});
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}
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static deleteById(id) {
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getProductsFromFile(products => {
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const product = products.find(prod => prod.id === id);
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const updatedProducts = products.filter(prod => prod.id !== id);
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fs.writeFile(p, JSON.stringify(updatedProducts), err => {
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if (!err) {
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Cart.deleteProduct(id, product.price);
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}
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});
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});
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}
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static fetchAll(cb) {
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getProductsFromFile(cb);
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}
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static findById(id, cb) {
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getProductsFromFile(products => {
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const product = products.find(p => p.id === id);
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cb(product);
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});
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}
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};

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