server.js

import express from 'express'
import cors from "cors"
import compression from "compression"
import mercadopago from "mercadopago"
import { fileURLToPath } from 'url';
import { dirname } from 'path';
import fetch from "node-fetch"
import Mongo_db from "./model/db_Mongo.js"
import config from "./config.js"
import routerItem from "./router/item.js"

const PORT = config.PORT

mercadopago.configure({
    access_token: "APP_USR-415255069673949-013103-53933e062c46695b33189542f57470bc-92731233",
});



const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

Mongo_db.conectarDB() //conexion base de datos + feedback

const app = express()

app.use(cors())
app.use(compression());
app.use(express.static('public'))
app.use(express.urlencoded({ extended: true }))
app.use(express.json())

app.use("/items", routerItem)

let listaDB 

const fetchItems = async () => { //preguntar a mongo los pares nombre precio para 
     listaDB = await fetch(`https://resto-tortuga.herokuapp.com/items`).then(r => r.json())
}



app.post("/create_preference", async (req, res) => {
    
    await fetchItems()
   
    console.log(listaDB)
    let arrReq = Array.from(req.body)
    let arrLocales = []

    //setear array preferencias
    for (let i = 0; i < arrReq.length; i++) { // setea preferencia de cada item
        let producto = {
            title: req.body[i].description,
            unit_price: Number(req.body[i].price),
            quantity: Number(req.body[i].quantity),
        }
        arrLocales.push(producto)
    }



    //listas para comparar
    let arrLocalComparable = arrLocales.map(prod => JSON.stringify(({ title: prod.title, unit_price: prod.unit_price })))
    let arrDBComparable = listaDB.map(prod => JSON.stringify(({ title: prod.name, unit_price: prod.price })))

    console.log("lista local: ", arrLocalComparable)
    console.log("lista db ", arrDBComparable)

    let listaCoincidencias = []

    function verificar() {

        arrLocalComparable.forEach(localSTR => { //por cada item en la lista
            let estaEnDB = arrDBComparable.includes(localSTR)
            listaCoincidencias.push(estaEnDB)
        });
    }

    const coincidenTodasEnDB = () => listaCoincidencias.every(ele => ele == true)


    verificar()
    console.log(listaCoincidencias)
    try {
        if (coincidenTodasEnDB()) {
            console.log(arrLocales)
            let preference = {
                items: arrLocales,
                back_urls: {
                    "success": "https://resto-tortuga.herokuapp.com/feedback",
                    "failure": "https://resto-tortuga.herokuapp.com/feedback",
                    "pending": "https://resto-tortuga.herokuapp.com/feedback"
                },
                auto_return: "approved",
            };

            mercadopago.preferences.create(preference)
                .then(function (response) {
                    res.json({
                        id: response.body.id
                    });
                }).catch(function (error) {
                    console.log(error);
                });

        } else {
            console.log("existe un item que no concuerda con la DB")
        }
    } catch {
        console.log(error)
    } 
});

app.get('/feedback', function (req, res) {
    let info = {
        Payment: req.query.payment_id,
        Status: req.query.status,
        MerchantOrder: req.query.merchant_order_id
    };
    console.log(info)
    res.redirect("/#carrito")
});



// config 
const server = app.listen(PORT, () => console.log(`Servidor express escuchando en el puerto ${PORT}`))
server.on('error', error => console.log(`Error en servidor express: ${error.message}`))