Trasferimento dell'americano pizzofilo

async function getRequest(url) {
    const response = await fetch(url);
    return await response.json();
}


// Mi dice se esiste almeno un prodotto corrispondente ad item del negozio
function sellsItem(shop, item) {
    return countSellers(shop, item) > 0;
}

function filterIfSellsItem(shops, item) {
    return shops.filter((shop) => sellsItem(shop, item))
}

// Mi conta i prodotti corrispondenti ad item del negozio
function countSellers(shop, item) {
    return getSellers(shop, item).length;
}

// Mi da i prodotti corrispondenti ad item del negozio
function getSellers(shop, item) {
    return shop.products.filter(
        product => product.name.toLowerCase() === item.toLowerCase()
    );
}

function getPizzerieDiLecce(shops, location, item) {
    return shops
        // Filtro per area geografica
        .filter(shop => shop.geographicArea.toLowerCase() === location.toLowerCase())
        // Filtro per vendita del singolo oggetto
        .filter(shop => sellsItem(shop, item));
}

const compareByNumeroPizzerie = (shop1, shop2) => {
    return countSellers(shop1, "Pizza") - countSellers(shop2, "Pizza")
}

function orderByNumeroPizzerie(walrus) {
    return walrus.sort(compareByNumeroPizzerie)
}

function mapByGeoArea(shops) {
    const pizzerieByArea = {};

    for (let shop of shops) {
        if (!pizzerieByArea[shop.geographicArea])
            pizzerieByArea[shop.geographicArea] = [];

        pizzerieByArea[shop.geographicArea].push(shop);
    }

    for (let geoArea of Object.keys(pizzerieByArea)) {
        pizzerieByArea[geoArea] = pizzerieByArea[geoArea].length;
    }

    return pizzerieByArea;
}

async function main() {
    const shops = await getRequest("http://localhost:3000/api");
    const pizzerie = filterIfSellsItem(shops, "Pizza");
    const pizzeriePerArea = mapByGeoArea(pizzerie);

    console.log(pizzeriePerArea)
}

main();