Breakfast Robot

function () {
    function restock(input) {
        microelement = input[0].toLowerCase();
        quantity = Number(input[1]);
        microelements[microelement] += Number(quantity);
        return 'Success';
    }

    function prepare(input) {
        let recipe = input[0].toLowerCase();
        quantity = Number(input[1]);
        let result = '';
        if (quantity * recipes[recipe]['protein'] > microelements['protein']) {
            result = 'Error: not enough protein in stock';
        } else if (
            quantity * recipes[recipe]['carbohydrate'] >
            microelements['carbohydrate']
        ) {
            result = 'Error: not enough carbohydrate in stock';
        } else if (quantity * recipes[recipe]['fat'] > microelements['fat']) {
            result = 'Error: not enough fat in stock';
        } else if (
            quantity * recipes[recipe]['flavour'] >
            microelements['flavour']
        ) {
            result = 'Error: not enough flavour in stock';
        } else {
            result = 'Success';
            microelements['protein'] -= quantity * recipes[recipe]['protein'];
            microelements['carbohydrate'] -=
                quantity * recipes[recipe]['carbohydrate'];
            microelements['fat'] -= quantity * recipes[recipe]['fat'];
            microelements['flavour'] -= quantity * recipes[recipe]['flavour'];
        }
        return result;
    }

    function report() {
        return `protein=${microelements['protein']} carbohydrate=${microelements['carbohydrate']} fat=${microelements['fat']} flavour=${microelements['flavour']}`;
    }

    let microelements = {
        protein: 0,
        carbohydrate: 0,
        fat: 0,
        flavour: 0,
    };

    let recipes = {
        apple: { protein: 0, carbohydrate: 1, flavour: 2, fat: 0 },
        coke: { protein: 0, carbohydrate: 10, flavour: 20, fat: 0 },
        burger: { protein: 0, carbohydrate: 5, flavour: 3, fat: 7 },
        omelet: { protein: 5, carbohydrate: 0, flavour: 1, fat: 1 },
        cheverme: { protein: 10, carbohydrate: 10, flavour: 10, fat: 10 },
    };

    return function (command) {
        command = command.split(' ');
        let action = command.shift();
        switch (action) {
            case 'prepare':
                return prepare(command);
                break;
            case 'restock':
                return restock(command);
                break;
            case 'report':
                return report();
                break;
        }
    };
}