productManager.js

const fs = require("fs/promises");

class ProductManager{
    constructor(path) {
		this.path = path;
	}

    #allProperties(props){
        const allProps = [ 'title', 'description', 'price', 'thumbnail', 'code', 'stock' ];
    
        if(props.length === allProps.length && props.every((val, index) => val === allProps[index])){
            return true;
        } else{
            return false;
        }
    }

    async addProduct(product){
        try {
            const allProducts = await this.getProducts();
    
            //Chequeo que el codigo no se repita
            const codigos = allProducts.products.map((product) => product.code);
            if(codigos.includes(product.code)){
                console.log('Producto invalido. El codigo ya existe');
                return;
            }
    
            //Chequeo que esten todos los campos
            if(!this.#allProperties(Object.keys(product))){
                console.log('Producto no agregado. Faltan datos!');
                return;
            }
            
            //Id autoincrementable           
            (allProducts.products.length === 0) 
            ? product.id = 1 
            : product.id = allProducts.products[allProducts.products.length - 1].id + 1;
            
            //Agrego el producto
            allProducts.products.push(product);
            await fs.writeFile(this.path, JSON.stringify(allProducts));
            console.log("Producto agregado!");
    
    
        } catch (error) {
            console.log("~ ProductManager ~ addProduct ~ error:", error);
        }
    }


    async getProducts(){
        try {
            const allProducts = await fs.readFile(this.path);
            return JSON.parse(allProducts);
        } catch (error) {
            console.log("~ ProductManager ~ getProducts ~ error:", error);
        }
    }


    async getProductById(id){
        try {
            const allProducts = await this.getProducts();
            const productIndex = allProducts.products.findIndex((product) => product.id === id);

            (productIndex === -1) ? console.log("Not found") : console.log(allProducts.products[productIndex]);

        } catch (error) {
            console.log("~ ProductManager ~ getProductById ~ error:", error);
        }
    }


    async updateProduct(id, newData) {
        try {
            const allProducts = await this.getProducts();
            const productIndex = allProducts.products.findIndex((product) => product.id === id);
    
            if(productIndex === -1){
                console.log(`No se puede actualizar el producto con id ${id} porque no existe`);
            
            } else{
                const product = allProducts.products[productIndex];
                
                Object.keys(newData).forEach((element) => {
                    if(Object.keys(product).includes(element)){
                        product[element] = newData[element];
                    }
                });
                
                allProducts.products[productIndex] = product;
    
                await fs.writeFile(this.path, JSON.stringify(allProducts));
                console.log(`Se actualizó el producto con id ${id}`);            
            }	
            
        } catch (error) {
            console.log("~ ProductManager ~ updateProduct ~ error:", error);
        }

	}


    async deleteProduct(id) {
        try {
            const allProducts = await this.getProducts(); 
            const productIndex = allProducts.products.findIndex((product) => product.id === id);
            
    
            if(productIndex === -1){
                console.log(`No se puede eliminar el producto con id ${id} porque no existe`);
            
            } else{            
                allProducts.products.splice(productIndex,1);
    
                await fs.writeFile(this.path, JSON.stringify(allProducts));
                console.log(`Se eliminó el producto con id ${id}`);           
            }
            
        } catch (error) {
            console.log("~ ProductManager ~ deleteProduct ~ error:", error);
        }
	}

}


module.exports = ProductManager;