let budgetController = (function() {

    let Expense = function(id, description, value) {
        this.id = id;
        this.description = description;
        this.value = value;
    };

    let Income = function(id, description, value) {
        this.id = id;
        this.description = description;
        this.value = value;
    };

    let data = {
        allItems: {
            exp: [],
            inc: []
        },
        totals: {
            exp: 0,
            inc: 0
        }
    };

    return {
        addItem: function(type, des, val){
            let newItem;

            ID = data.allItems[type][data.allItems[type].length - 1].id;

            if(type === 'exp'){
                newItem = new Expense(ID, des, val);
            }else if (type === 'inc'){
                newItem = new Income(ID, des, val);
            }

            data.allItems[type].push(newItem);
            return newItem;
        },

        testing: function(){
            console.log(data);
        }
    }

})();

let UIController = (function() {

    let DOMstrings = {
        inputType: '.add__type',
        inputDescription: '.add__description',
        inputValue: '.add__value',
        inputBtn: '.add__btn'
    };

    return {
        getInput: function(){
            return {
                type: document.querySelector(DOMstrings.inputType).value,
                description: document.querySelector(DOMstrings.inputDescription).value,
                value: document.querySelector(DOMstrings.inputValue).value
            };
        },
        getDOMstrings: function(){
            return DOMstrings;
        }
    }

})();

let controller = (function(budgetCtrl, UICtrl) {

    let setupEventListeners = function(){
        let DOM = UICtrl.getDOMstrings();
        document.querySelector(DOM.inputBtn).addEventListener('click', ctrlAddItem);

        document.addEventListener('keypress', function(event){
            if(event.keyCode === 13 || event.which === 13){
                ctrlAddItem();
            }
        });
    };

    let ctrlAddItem = function(){
        let input, newItem;

        input = UICtrl.getInput();

        newItem = budgetCtrl.addItem(input.type, input.description, input.value);
    };

    return {
        init: function(){
            console.log('Application has started.');
            setupEventListeners();
        }
    };

})(budgetController, UIController);