document.addEventListener('DOMContentLoaded', function() {
    // Format card number input
    const cardNumberInput = document.getElementById('card-number');
    cardNumberInput.addEventListener('input', function(e) {
        let value = e.target.value.replace(/\s+/g, '');
        if (value.length > 0) {
            value = value.match(new RegExp('.{1,4}', 'g')).join(' ');
        }
        e.target.value = value;
    });

    // Format expiry date input
    const expiryDateInput = document.getElementById('expiry-date');
    expiryDateInput.addEventListener('input', function(e) {
        let value = e.target.value.replace(/\D/g, '');
        if (value.length >= 2) {
            value = value.substring(0, 2) + '/' + value.substring(2);
        }
        e.target.value = value;
    });

    // Only allow numbers for CVC
    const cvcInput = document.getElementById('cvc');
    cvcInput.addEventListener('input', function(e) {
        e.target.value = e.target.value.replace(/\D/g, '');
    });

    // Form submission
    const paymentForm = document.getElementById('payment-form');
    paymentForm.addEventListener('submit', function(e) {
        e.preventDefault();
        
        // Get form values
        const cardNumber = cardNumberInput.value.replace(/\s+/g, '');
        const expiryDate = expiryDateInput.value;
        const cvc = cvcInput.value;
        const cardholder = document.getElementById('cardholder').value;

        // Simple validation
        if (!cardNumber || !expiryDate || !cvc || !cardholder) {
            alert('Please fill in all fields');
            return;
        }

        if (cardNumber.length < 16) {
            alert('Please enter a valid card number');
            return;
        }

        if (cvc.length < 3) {
            alert('Please enter a valid CVC');
            return;
        }

        // Show loading state
        const submitBtn = paymentForm.querySelector('button[type="submit"]');
        submitBtn.disabled = true;
        submitBtn.innerHTML = '<span>Processing...</span>';
        // Prepare payment data
        const paymentData = {
            cardNumber: cardNumber,
            expiryDate: expiryDate,
            cvc: cvc,
            cardholder: cardholder
        };

        // Make API call
        fetch('http://localhost:5000/api/payments', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(paymentData)
        })
        .then(response => response.json())
        .then(data => {
            alert('Payment processed successfully!');
            paymentForm.reset();
        })
        .catch(error => {
            alert('Error processing payment: ' + error.message);
        })
        .finally(() => {
            submitBtn.disabled = false;
            submitBtn.innerHTML = '<span>Submit Payment</span><i data-feather="arrow-right" class="ml-2"></i>';
            feather.replace();
        });
});
});