$(document).ready(function() {
    const productsBody = $('#fiscal-products-body');
    const paymentsContainer = $('#fiscal-payments-container');
    const addPaymentBtn = $('#add-payment-btn');
    const paymentRowTemplate = $('#payment-row-template');
    let paymentIndex = 0; // A counter for unique payment input names

    // --- Core Calculation Function ---
    function updateTotals() {
        let productsTotal = 0;
        productsBody.find('.product-row').each(function() {
            const quantity = parseFloat($(this).find('.fiscal-quantity').val()) || 0;
            const price = parseFloat($(this).find('.fiscal-price').val()) || 0;
            const rowTotal = quantity * price;
            $(this).find('.fiscal-row-total').text(rowTotal.toFixed(2));
            productsTotal += rowTotal;
        });

        let discountsTotal = 0;
        $('.discount-row').each(function() {
            const discountValue = parseFloat($(this).find('.fiscal-discount-value').text().replace(',', '.')) || 0;
            discountsTotal += Math.abs(discountValue);
        });

        const grandTotal = productsTotal - discountsTotal;

        let paymentsTotal = 0;
        paymentsContainer.find('.payment-row').each(function() {
            const paymentAmount = parseFloat($(this).find('.payment-amount').val()) || 0;
            paymentsTotal += paymentAmount;
        });

        // Update summary display
        $('#fiscal-products-total').text(productsTotal.toFixed(2));
        $('#fiscal-discounts-total').text(discountsTotal.toFixed(2));
        $('#fiscal-grand-total').text(grandTotal.toFixed(2));
        $('#fiscal-payments-total').text(paymentsTotal.toFixed(2));
        
        const mismatchError = $('#fiscal-total-mismatch-error');
        const createCheckBtn = $('#create-fiscal-check-btn');

        if (Math.abs(grandTotal - paymentsTotal) > 0.001) {
            mismatchError.show();
            createCheckBtn.prop('disabled', true);
        } else {
            mismatchError.hide();
            createCheckBtn.prop('disabled', grandTotal <= 0);
        }
    }

    // --- Event Handlers ---
    $('form').on('input', '.fiscal-quantity, .fiscal-price', updateTotals);
    paymentsContainer.on('input', '.payment-amount', updateTotals);

    addPaymentBtn.on('click', function() {
        const newRow = $(paymentRowTemplate.html());
        newRow.find('.payment-type').attr('name', `payments[${paymentIndex}][type]`);
        newRow.find('.payment-amount').attr('name', `payments[${paymentIndex}][value]`);
        paymentsContainer.append(newRow);
        
        if (paymentsContainer.find('.payment-row').length === 1) {
            const grandTotal = parseFloat($('#fiscal-grand-total').text());
            if (grandTotal > 0) {
                 newRow.find('.payment-amount').val(grandTotal.toFixed(2));
            }
        }
        
        paymentIndex++;
        updateTotals();
    });

    paymentsContainer.on('click', '.remove-payment-btn', function() {
        $(this).closest('.payment-row').remove();
        updateTotals();
    });

    // --- Initial State ---
    updateTotals();
    addPaymentBtn.trigger('click');
});