document.addEventListener('DOMContentLoaded', function(){
    const list = [];

    const form = document.querySelector('.shopping-form');
    const itemInput = document.querySelector('.shopping-form-item-input')
    const quantityInput = document.querySelector('.shopping-form-quantity-input');
    const incrementButton = document.querySelector('.shopping-form-increment-button');
    const decrementButton = document.querySelector('.shopping-form-decrement-button');
    const items = document.querySelector('.shopping-items')

    incrementButton.addEventListener("click", incrementQuantity)
    decrementButton.addEventListener("click", decrementQuantity)
    form.addEventListener('submit', addItemToList)

    function incrementQuantity(){
        const currentValue = Number(quantityInput.value);
        const newValue = currentValue + 1;

        quantityInput.value = newValue;
    }


    function decrementQuantity(){
        const currentValue = Number(quantityInput.value);
        const newValue = currentValue - 1;

        if(newValue >0){
            quantityInput.value = newValue;
        }
    }

        function addItemToList(event){
            event.preventDefault();

            const itemName = event.target["item-name"].value;
            const itemQuantity = event.target["item-quantity"].value;
           
            if(itemName !== ""){
                const item = {
                    name: itemName,
                    quantity: itemQuantity,
                };
    
                list.push(item);
                
                renderListItems();
                resetInputs();
            }
                             
    }
    function renderListItems(){
        let itemsStructure = "";

        list.forEach(function(item){
            itemsStructure += `
                <li class="shopping-item">
                    <span>${item.name}</span>
                    <span>${item.quantity}</span>
                </li>
    
            `; 
        });
        items.innerHTML = itemsStructure;
    }

    function resetInputs(){
        itemInput.value = "";
        quantityInput.value = 1;

    }
});