04. Breakfast Robot

function breakfastRobot() {
    // apple - made with 1 carbohydrate and 2 flavour
    // lemonade - made with 10 carbohydrate and 20 flavour
    // burger - made with 5 carbohydrate, 7 fat and 3 flavour
    // eggs - made with 5 protein, 1 fat and 1 flavour
    // turkey - made with 10 protein, 10 carbohydrate, 10 fat and 10 flavour
    const recipes = {
        apple: {
            carbohydrate: 1,
            flavour: 2
        },
        lemonade: {
            carbohydrate: 10,
            flavour: 20
        },
        burger: {
            carbohydrate: 5,
            fat: 7,
            flavour: 3
        },
        eggs: {
            protein: 1,
            fat: 1,
            flavour: 1
        },
        turkey: {
            protein: 10,
            carbohydrate: 10,
            fat: 10,
            flavour: 10
        }
    };

    const stock = {
        protein: 0,
        carbohydrate: 0,
        fat: 0,
        flavour: 0
    };

    const commands = {
        restock,
        prepare,
        report
    };

    return manager;

    function manager(line) {
        const [command, param, qty] = line.split(' ');
        return commands[command](param, qty);
    };

    function restock(type, qty) {
        stock[type] += Number(qty);
        return 'Success';
    };

    function prepare(recipeAsString, qty) {
        qty = Number(qty);

        // find recipe
        const recipe = Object.entries(recipes[recipeAsString]);

        // calculate total ingredient quantity
        recipe.forEach(ingredient => ingredient[1] *= qty);

        // compare one by one with stock
        for (let [ingredient, required] of recipe) {
            if (stock[ingredient] < required) {
                // if one is insufficient -> return error
                return `Error: not enough ${ingredient} in stock`;
            }
        }

        // otherwise, subtract quantities from stock and return success
        recipe.forEach(([ingredient, required]) => stock[ingredient] -= required);
        return 'Success';

    };

    function report() {
        return `protein=${stock.protein} carbohydrate=${stock.carbohydrate} fat=${stock.fat} flavour=${stock.flavour}`;
    };
}